/*
 Copyright (C) 2002-2004 MySQL AB

 This program is free software; you can redistribute it and/or modify
 it under the terms of version 2 of the GNU General Public License as
 published by the Free Software Foundation.
 

 There are special exceptions to the terms and conditions of the GPL 
 as it is applied to this software. View the full text of the 
 exception exception in file EXCEPTIONS-CONNECTOR-J in the directory of this 
 software distribution.

 This program is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU General Public License for more details.

 You should have received a copy of the GNU General Public License
 along with this program; if not, write to the Free Software
 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

 */
package com.mysql.jdbc;

import java.io.UnsupportedEncodingException;
import java.math.BigDecimal;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;


/**
 * A result set that is updatable.
 *
 * @author Mark Matthews
 */
public class UpdatableResultSet extends ResultSet {
    /** Marker for 'stream' data when doing INSERT rows */
    private final static byte[] STREAM_DATA_MARKER = "** STREAM DATA **"
        .getBytes();

    /** List of primary keys */
    private List primaryKeyIndicies = null;

    /** PreparedStatement used to delete data */
    private com.mysql.jdbc.PreparedStatement deleter = null;

    /** PreparedStatement used to insert data */
    private com.mysql.jdbc.PreparedStatement inserter = null;

    /** PreparedStatement used to refresh data */
    private com.mysql.jdbc.PreparedStatement refresher;

    /** PreparedStatement used to delete data */
    private com.mysql.jdbc.PreparedStatement updater = null;
    private SingleByteCharsetConverter charConverter;
    private String charEncoding;
    private String deleteSQL = null;
    private String insertSQL = null;
    private String quotedIdChar = null;
    private String refreshSQL = null;
    private String qualifiedAndQuotedTableName;
    private String tableOnlyName;

    /** SQL for in-place modifcation */
    private String updateSQL = null;

    /** What is the default value for the column? */
    private byte[][] defaultColumnValue;

    /** The binary data for the 'current' row */
    private byte[][] savedCurrentRow;

    /** Is this result set updateable? */
    private boolean isUpdatable = false;

    /**
     * Creates a new UpdatableResultSet object.
     *
     * @param updateCount DOCUMENT ME!
     * @param updateID DOCUMENT ME!
     */
    public UpdatableResultSet(long updateCount, long updateID) {
        super(updateCount, updateID);
    }

    // ****************************************************************
    //
    //                       END OF PUBLIC INTERFACE
    //
    // ****************************************************************

    /**
     * Create a new ResultSet - Note that we create ResultSets to represent the
     * results of everything.
     *
     * @param catalog the database in use when this result set was created
     * @param fields an array of Field objects (basically, the ResultSet
     *        MetaData)
     * @param rows Vector of the actual data
     * @param conn the status string returned from the back end
     *
     * @throws SQLException DOCUMENT ME!
     */
    public UpdatableResultSet(String catalog, Field[] fields, RowData rows,
        com.mysql.jdbc.Connection conn) throws SQLException {
        super(catalog, fields, rows, conn);
        isUpdatable = checkUpdatability();
    }

    /**
     * Creates a new UpdatableResultSet object.
     *
     * @param fields DOCUMENT ME!
     * @param rows DOCUMENT ME!
     *
     * @throws SQLException DOCUMENT ME!
     */
    public UpdatableResultSet(Field[] fields, RowData rows)
        throws SQLException {
        super(fields, rows);
        isUpdatable = checkUpdatability();
    }

    /**
     * JDBC 2.0
     * 
     * <p>
     * Determine if the cursor is after the last row in the result  set.
     * </p>
     *
     * @return true if after the last row, false otherwise.  Returns false when
     *         the result set contains no rows.
     *
     * @exception SQLException if a database-access error occurs.
     */
    public synchronized boolean isAfterLast() throws SQLException {
        return super.isAfterLast();
    }

    /**
     * JDBC 2.0
     * 
     * <p>
     * Determine if the cursor is before the first row in the result  set.
     * </p>
     *
     * @return true if before the first row, false otherwise. Returns false
     *         when the result set contains no rows.
     *
     * @exception SQLException if a database-access error occurs.
     */
    public synchronized boolean isBeforeFirst() throws SQLException {
        return super.isBeforeFirst();
    }

    /**
     * JDBC 2.0 Return the concurrency of this result set.  The concurrency
     * used is determined by the statement that created the result set.
     *
     * @return the concurrency type, CONCUR_READ_ONLY, etc.
     *
     * @exception SQLException if a database-access error occurs
     */
    public int getConcurrency() throws SQLException {
        return (isUpdatable ? CONCUR_UPDATABLE : CONCUR_READ_ONLY);
    }

    /**
     * JDBC 2.0
     * 
     * <p>
     * Determine if the cursor is on the first row of the result set.
     * </p>
     *
     * @return true if on the first row, false otherwise.
     *
     * @exception SQLException if a database-access error occurs.
     */
    public synchronized boolean isFirst() throws SQLException {
        return super.isFirst();
    }

    /**
     * JDBC 2.0
     * 
     * <p>
     * Determine if the cursor is on the last row of the result set.    Note:
     * Calling isLast() may be expensive since the JDBC driver might need to
     * fetch ahead one row in order to determine  whether the current row is
     * the last row in the result set.
     * </p>
     *
     * @return true if on the last row, false otherwise.
     *
     * @exception SQLException if a database-access error occurs.
     */
    public synchronized boolean isLast() throws SQLException {
        return super.isLast();
    }

    /**
     * JDBC 2.0
     * 
     * <p>
     * Move to an absolute row number in the result set.
     * </p>
     * 
     * <p>
     * If row is positive, moves to an absolute row with respect to the
     * beginning of the result set.  The first row is row 1, the second is row
     * 2, etc.
     * </p>
     * 
     * <p>
     * If row is negative, moves to an absolute row position with respect to
     * the end of result set.  For example, calling absolute(-1) positions the
     * cursor on the last row, absolute(-2) indicates the next-to-last row,
     * etc.
     * </p>
     * 
     * <p>
     * An attempt to position the cursor beyond the first/last row in the
     * result set, leaves the cursor before/after the first/last row,
     * respectively.
     * </p>
     * 
     * <p>
     * Note: Calling absolute(1) is the same as calling first(). Calling
     * absolute(-1) is the same as calling last().
     * </p>
     *
     * @param row DOCUMENT ME!
     *
     * @return true if on the result set, false if off.
     *
     * @exception SQLException if a database-access error occurs, or  row is 0,
     *            or result set type is TYPE_FORWARD_ONLY.
     */
    public synchronized boolean absolute(int row) throws SQLException {
        return super.absolute(row);
    }

    /**
     * JDBC 2.0
     * 
     * <p>
     * Moves to the end of the result set, just after the last row.  Has no
     * effect if the result set contains no rows.
     * </p>
     *
     * @exception SQLException if a database-access error occurs, or result set
     *            type is TYPE_FORWARD_ONLY.
     */
    public synchronized void afterLast() throws SQLException {
        super.afterLast();
    }

    /**
     * JDBC 2.0
     * 
     * <p>
     * Moves to the front of the result set, just before the first row. Has no
     * effect if the result set contains no rows.
     * </p>
     *
     * @exception SQLException if a database-access error occurs, or result set
     *            type is TYPE_FORWARD_ONLY
     */
    public synchronized void beforeFirst() throws SQLException {
        super.beforeFirst();
    }

    /**
     * JDBC 2.0 The cancelRowUpdates() method may be called after calling an
     * updateXXX() method(s) and before calling updateRow() to rollback  the
     * updates made to a row.  If no updates have been made or  updateRow()
     * has already been called, then this method has no  effect.
     *
     * @exception SQLException if a database-access error occurs, or if called
     *            when on the insert row.
     */
    public synchronized void cancelRowUpdates() throws SQLException {
        if (doingUpdates) {
            doingUpdates = false;
            updater.clearParameters();
        }
    }

    /**
     * After this call, getWarnings returns null until a new warning is
     * reported for this ResultSet
     *
     * @exception java.sql.SQLException if a database access error occurs
     */
    public synchronized void clearWarnings() throws java.sql.SQLException {
        warningChain = null;
    }

    /**
     * In some cases, it is desirable to immediately release a ResultSet
     * database and JDBC resources instead of waiting for this to happen when
     * it is automatically closed.  The close method provides this immediate
     * release.
     * 
     * <p>
     * <B>Note:</B> A ResultSet is automatically closed by the Statement the
     * Statement that generated it when that Statement is closed, re-executed,
     * or is used to retrieve the next result from a sequence of multiple
     * results.  A ResultSet is also automatically closed when it is garbage
     * collected.
     * </p>
     *
     * @exception java.sql.SQLException if a database access error occurs
     */
    public synchronized void close() throws java.sql.SQLException {
        super.close();
    }

    /**
     * JDBC 2.0 Delete the current row from the result set and the underlying
     * database.  Cannot be called when on the insert row.
     *
     * @exception SQLException if a database-access error occurs, or if called
     *            when on the insert row.
     * @throws SQLException if the ResultSet is not updatable or some other
     *         error occurs
     */
    public synchronized void deleteRow() throws SQLException {
        if (!isUpdatable) {
            throw new NotUpdatable();
        }

        if (onInsertRow) {
            throw new SQLException(
                "Can not call deleteRow() when on insert row");
        } else if (rowData.size() == 0) {
            throw new SQLException("Can't deleteRow() on empty result set");
        } else if (isBeforeFirst()) {
            throw new SQLException(
                "Before start of result set. Can not call deleteRow().");
        } else if (isAfterLast()) {
            throw new SQLException(
                "After end of result set. Can not call deleteRow().");
        }

        if (deleter == null) {
            if (deleteSQL == null) {
                generateStatements();
            }

            deleter = (com.mysql.jdbc.PreparedStatement) connection
                .prepareStatement(deleteSQL);
            
            if (deleter.getMaxRows() != 0) {
            	deleter.setMaxRows(0);
            }
        }

        deleter.clearParameters();

        String characterEncoding = null;

        if (connection.useUnicode()) {
            characterEncoding = connection.getEncoding();
        }

        //
        // FIXME: Use internal routines where possible for character
        //        conversion!
        try {
            int numKeys = primaryKeyIndicies.size();

            if (numKeys == 1) {
                int index = ((Integer) primaryKeyIndicies.get(0)).intValue();
                String currentVal = ((characterEncoding == null)
                    ? new String(thisRow[index])
                    : new String(thisRow[index], characterEncoding));
                deleter.setString(1, currentVal);
            } else {
                for (int i = 0; i < numKeys; i++) {
                    int index = ((Integer) primaryKeyIndicies.get(i)).intValue();
                    String currentVal = ((characterEncoding == null)
                        ? new String(thisRow[index])
                        : new String(thisRow[index], characterEncoding));
                    deleter.setString(i + 1, currentVal);
                }
            }

            deleter.executeUpdate();
            rowData.removeRow(rowData.getCurrentRowNumber());
        } catch (java.io.UnsupportedEncodingException encodingEx) {
            throw new SQLException("Unsupported character encoding '"
                + connection.getEncoding() + "'");
        }
    }

    /**
     * JDBC 2.0
     * 
     * <p>
     * Moves to the first row in the result set.
     * </p>
     *
     * @return true if on a valid row, false if no rows in the result set.
     *
     * @exception SQLException if a database-access error occurs, or result set
     *            type is TYPE_FORWARD_ONLY.
     */
    public synchronized boolean first() throws SQLException {
        return super.first();
    }

    /**
     * JDBC 2.0 Insert the contents of the insert row into the result set and
     * the database.  Must be on the insert row when this method is called.
     *
     * @exception SQLException if a database-access error occurs, if called
     *            when not on the insert row, or if all non-nullable columns
     *            in the insert row have not been given a value
     */
    public synchronized void insertRow() throws SQLException {
        if (!onInsertRow) {
            throw new SQLException("Not on insert row");
        } else {
            inserter.executeUpdate();

            int numPrimaryKeys = 0;

            if (primaryKeyIndicies != null) {
                numPrimaryKeys = primaryKeyIndicies.size();
            }

            long autoIncrementId = inserter.getLastInsertID();
            int numFields = fields.length;
            byte[][] newRow = new byte[numFields][];

            for (int i = 0; i < numFields; i++) {
                if (inserter.isNull(i)) {
                    newRow[i] = null;
                } else {
                    newRow[i] = inserter.getBytes(i);
                }

                if ((numPrimaryKeys == 1) && fields[i].isPrimaryKey()
                        && (autoIncrementId > 0)) {
                    newRow[i] = String.valueOf(autoIncrementId).getBytes();
                }
            }

            rowData.addRow(newRow);
            resetInserter();
        }
    }

    /**
     * JDBC 2.0
     * 
     * <p>
     * Moves to the last row in the result set.
     * </p>
     *
     * @return true if on a valid row, false if no rows in the result set.
     *
     * @exception SQLException if a database-access error occurs, or result set
     *            type is TYPE_FORWARD_ONLY.
     */
    public synchronized boolean last() throws SQLException {
        return super.last();
    }

    /**
     * JDBC 2.0 Move the cursor to the remembered cursor position, usually the
     * current row.  Has no effect unless the cursor is on the insert  row.
     *
     * @exception SQLException if a database-access error occurs, or the result
     *            set is not updatable
     * @throws SQLException if the ResultSet is not updatable or some other
     *         error occurs
     */
    public synchronized void moveToCurrentRow() throws SQLException {
        if (!isUpdatable) {
            throw new NotUpdatable();
        }

        if (this.onInsertRow) {
            onInsertRow = false;
            this.thisRow = this.savedCurrentRow;
        }
    }

    /**
     * JDBC 2.0 Move to the insert row.  The current cursor position is
     * remembered while the cursor is positioned on the insert row. The insert
     * row is a special row associated with an updatable result set.  It is
     * essentially a buffer where a new row may be constructed by calling the
     * updateXXX() methods prior to  inserting the row into the result set.
     * Only the updateXXX(), getXXX(), and insertRow() methods may be  called
     * when the cursor is on the insert row.  All of the columns in  a result
     * set must be given a value each time this method is called before
     * calling insertRow().  UpdateXXX()must be called before getXXX() on a
     * column.
     *
     * @exception SQLException if a database-access error occurs, or the result
     *            set is not updatable
     * @throws NotUpdatable DOCUMENT ME!
     */
    public synchronized void moveToInsertRow() throws SQLException {
        if (!this.isUpdatable) {
            throw new NotUpdatable();
        }

        if (this.inserter == null) {
            generateStatements();
            this.inserter = (com.mysql.jdbc.PreparedStatement) connection
                .prepareStatement(this.insertSQL);
            
            if (this.inserter.getMaxRows() != 0) {
            	this.inserter.setMaxRows(0);
            }
            
            extractDefaultValues();
            resetInserter();
        } else {
            resetInserter();
        }

		int numFields = this.fields.length;
		
		this.onInsertRow = true;
		this.doingUpdates = false;
		this.savedCurrentRow = this.thisRow;
		this.thisRow = new byte[numFields][];
			   
        for (int i = 0; i < numFields; i++) {
            if (this.defaultColumnValue[i] != null) {
            	Field f = this.fields[i];
            	
            	switch (f.getMysqlType()) {
            	 case MysqlDefs.FIELD_TYPE_DATE:
            	 case MysqlDefs.FIELD_TYPE_DATETIME:
            	 case MysqlDefs.FIELD_TYPE_NEWDATE:
            	 case MysqlDefs.FIELD_TYPE_TIME:
            	 case MysqlDefs.FIELD_TYPE_TIMESTAMP:
            	 	
            	 	if (this.defaultColumnValue[i].length > 7 &&
            	 		this.defaultColumnValue[i][0] == (byte)'C' &&
            	 		this.defaultColumnValue[i][1] == (byte)'U' &&
            	 		this.defaultColumnValue[i][2] == (byte)'R' &&
            	 		this.defaultColumnValue[i][3] == (byte)'R' &&
            	 		this.defaultColumnValue[i][4] == (byte)'E' &&
            	 		this.defaultColumnValue[i][5] == (byte)'N' &&
            	 		this.defaultColumnValue[i][6] == (byte)'T' &&
            	 		this.defaultColumnValue[i][7] == (byte)'_') {
            	 		this.inserter.setBytesNoEscapeNoQuotes(i + 1, this.defaultColumnValue[i]);
            	 		
            	 		break;
            	 	}
            	 default:
            		this.inserter.setBytes(i + 1, this.defaultColumnValue[i], false, false);
            	}
                
                // This value _could_ be changed from a getBytes(), so we
                // need a copy....
                byte[] defaultValueCopy = new byte[this.defaultColumnValue[i].length];
                System.arraycopy(defaultColumnValue[i], 0, defaultValueCopy, 0, defaultValueCopy.length);
                this.thisRow[i] = defaultValueCopy;
            } else {
                this.inserter.setNull(i + 1, java.sql.Types.NULL);
                this.thisRow[i] = null;
            }
        }
    }

    /**
     * A ResultSet is initially positioned before its first row, the first call
     * to next makes the first row the current row; the second call makes the
     * second row the current row, etc.
     * 
     * <p>
     * If an input stream from the previous row is open, it is implicitly
     * closed.  The ResultSet's warning chain is cleared when a new row is
     * read
     * </p>
     *
     * @return true if the new current is valid; false if there are no more
     *         rows
     *
     * @exception java.sql.SQLException if a database access error occurs
     */
    public synchronized boolean next() throws java.sql.SQLException {
        return super.next();
    }

    /**
     * The prev method is not part of JDBC, but because of the architecture of
     * this driver it is possible to move both forward and backward within the
     * result set.
     * 
     * <p>
     * If an input stream from the previous row is open, it is implicitly
     * closed.  The ResultSet's warning chain is cleared when a new row is
     * read
     * </p>
     *
     * @return true if the new current is valid; false if there are no more
     *         rows
     *
     * @exception java.sql.SQLException if a database access error occurs
     */
    public synchronized boolean prev() throws java.sql.SQLException {
        return super.prev();
    }

    /**
     * JDBC 2.0
     * 
     * <p>
     * Moves to the previous row in the result set.
     * </p>
     * 
     * <p>
     * Note: previous() is not the same as relative(-1) since it makes sense to
     * call previous() when there is no current row.
     * </p>
     *
     * @return true if on a valid row, false if off the result set.
     *
     * @exception SQLException if a database-access error occurs, or result set
     *            type is TYPE_FORWAR_DONLY.
     */
    public synchronized boolean previous() throws SQLException {
        return super.previous();
    }

    /**
     * JDBC 2.0 Refresh the value of the current row with its current value in
     * the database.  Cannot be called when on the insert row. The
     * refreshRow() method provides a way for an application to  explicitly
     * tell the JDBC driver to refetch a row(s) from the database.  An
     * application may want to call refreshRow() when  caching or prefetching
     * is being done by the JDBC driver to fetch the latest value of a row
     * from the database.  The JDBC driver  may actually refresh multiple rows
     * at once if the fetch size is  greater than one.  All values are
     * refetched subject to the transaction isolation  level and cursor
     * sensitivity.  If refreshRow() is called after calling updateXXX(), but
     * before calling updateRow() then the updates made to the row are lost.
     * Calling refreshRow() frequently will likely slow performance.
     *
     * @exception SQLException if a database-access error occurs, or if called
     *            when on the insert row.
     * @throws NotUpdatable DOCUMENT ME!
     */
    public synchronized void refreshRow() throws SQLException {
        if (!isUpdatable) {
            throw new NotUpdatable();
        }

        if (onInsertRow) {
            throw new SQLException(
                "Can not call refreshRow() when on insert row");
        } else if (rowData.size() == 0) {
            throw new SQLException("Can't refreshRow() on empty result set");
        } else if (isBeforeFirst()) {
            throw new SQLException(
                "Before start of result set. Can not call refreshRow().");
        } else if (isAfterLast()) {
            throw new SQLException(
                "After end of result set. Can not call refreshRow().");
        }

        if (refresher == null) {
            if (refreshSQL == null) {
                generateStatements();
            }

            refresher = (com.mysql.jdbc.PreparedStatement) connection
                .prepareStatement(refreshSQL);
            
            if (refresher.getMaxRows() != 0) {
            	refresher.setMaxRows(0);
            }
        }

        refresher.clearParameters();

        int numKeys = primaryKeyIndicies.size();

        if (numKeys == 1) {
            byte[] dataFrom = null;
            int index = ((Integer) primaryKeyIndicies.get(0)).intValue();

            if (!doingUpdates) {
                dataFrom = thisRow[index];
            } else {
                dataFrom = updater.getBytes(index);

                // Primary keys not set?
                if (updater.isNull(index) || (dataFrom.length == 0)) {
                    dataFrom = thisRow[index];
                } else {
                    dataFrom = stripBinaryPrefix(dataFrom);
                }
            }

            refresher.setBytesNoEscape(1, dataFrom);
        } else {
            for (int i = 0; i < numKeys; i++) {
                byte[] dataFrom = null;
                int index = ((Integer) primaryKeyIndicies.get(i)).intValue();

                if (!doingUpdates) {
                    dataFrom = thisRow[index];
                } else {
                    dataFrom = updater.getBytes(index);

                    // Primary keys not set?
                    if (updater.isNull(index) || (dataFrom.length == 0)) {
                        dataFrom = thisRow[index];
                    } else {
                        dataFrom = stripBinaryPrefix(dataFrom);
                    }
                }

                refresher.setBytesNoEscape(i + 1, dataFrom);
            }
        }

        java.sql.ResultSet rs = null;

        try {
            rs = refresher.executeQuery();

            int numCols = rs.getMetaData().getColumnCount();

            if (rs.next()) {
                for (int i = 0; i < numCols; i++) {
                    byte[] val = rs.getBytes(i + 1);

                    if ((val == null) || rs.wasNull()) {
                        thisRow[i] = null;
                    } else {
                        thisRow[i] = rs.getBytes(i + 1);
                    }
                }
            } else {
                throw new SQLException("refreshRow() called on row that has been deleted or had primary key changed",
                    SQLError.SQL_STATE_GENERAL_ERROR);
            }
        } finally {
            if (rs != null) {
                try {
                    rs.close();
                } catch (SQLException ex) {
                    ; // ignore
                }
            }
        }
    }

    private byte[] stripBinaryPrefix(byte[] dataFrom) {
        return StringUtils.stripEnclosure(dataFrom, "_binary'", "'");
    }

    /**
     * JDBC 2.0
     * 
     * <p>
     * Moves a relative number of rows, either positive or negative. Attempting
     * to move beyond the first/last row in the result set positions the
     * cursor before/after the the first/last row. Calling relative(0) is
     * valid, but does not change the cursor position.
     * </p>
     * 
     * <p>
     * Note: Calling relative(1) is different than calling next() since is
     * makes sense to call next() when there is no current row, for example,
     * when the cursor is positioned before the first row or after the last
     * row of the result set.
     * </p>
     *
     * @param rows DOCUMENT ME!
     *
     * @return true if on a row, false otherwise.
     *
     * @exception SQLException if a database-access error occurs, or there is
     *            no current row, or result set type is TYPE_FORWARD_ONLY.
     */
    public synchronized boolean relative(int rows) throws SQLException {
        return super.relative(rows);
    }

    /**
     * JDBC 2.0 Determine if this row has been deleted.  A deleted row may
     * leave a visible "hole" in a result set.  This method can be used to
     * detect holes in a result set.  The value returned depends on whether or
     * not the result set can detect deletions.
     *
     * @return true if deleted and deletes are detected
     *
     * @exception SQLException if a database-access error occurs
     * @throws NotImplemented DOCUMENT ME!
     *
     * @see DatabaseMetaData#deletesAreDetected
     */
    public synchronized boolean rowDeleted() throws SQLException {
        throw new NotImplemented();
    }

    /**
     * JDBC 2.0 Determine if the current row has been inserted.  The value
     * returned  depends on whether or not the result set can detect visible
     * inserts.
     *
     * @return true if inserted and inserts are detected
     *
     * @exception SQLException if a database-access error occurs
     * @throws NotImplemented DOCUMENT ME!
     *
     * @see DatabaseMetaData#insertsAreDetected
     */
    public synchronized boolean rowInserted() throws SQLException {
        throw new NotImplemented();
    }

    //---------------------------------------------------------------------
    // Updates
    //---------------------------------------------------------------------

    /**
     * JDBC 2.0 Determine if the current row has been updated.  The value
     * returned  depends on whether or not the result set can detect updates.
     *
     * @return true if the row has been visibly updated by the owner or
     *         another, and updates are detected
     *
     * @exception SQLException if a database-access error occurs
     * @throws NotImplemented DOCUMENT ME!
     *
     * @see DatabaseMetaData#updatesAreDetected
     */
    public synchronized boolean rowUpdated() throws SQLException {
        throw new NotImplemented();
    }

    /**
     * JDBC 2.0  Update a column with an ascii stream value. The updateXXX()
     * methods are used to update column values in the current row, or the
     * insert row.  The updateXXX() methods do not  update the underlying
     * database, instead the updateRow() or insertRow() methods are called to
     * update the database.
     *
     * @param columnIndex the first column is 1, the second is 2, ...
     * @param x the new column value
     * @param length the length of the stream
     *
     * @exception SQLException if a database-access error occurs
     */
    public synchronized void updateAsciiStream(int columnIndex,
        java.io.InputStream x, int length) throws SQLException {
        if (!onInsertRow) {
            if (!doingUpdates) {
                doingUpdates = true;
                syncUpdate();
            }

            updater.setAsciiStream(columnIndex, x, length);
        } else {
            inserter.setAsciiStream(columnIndex, x, length);
            this.thisRow[columnIndex - 1] = STREAM_DATA_MARKER;
        }
    }

    /**
     * JDBC 2.0  Update a column with an ascii stream value. The updateXXX()
     * methods are used to update column values in the current row, or the
     * insert row.  The updateXXX() methods do not  update the underlying
     * database, instead the updateRow() or insertRow() methods are called to
     * update the database.
     *
     * @param columnName the name of the column
     * @param x the new column value
     * @param length of the stream
     *
     * @exception SQLException if a database-access error occurs
     */
    public synchronized void updateAsciiStream(String columnName,
        java.io.InputStream x, int length) throws SQLException {
        updateAsciiStream(findColumn(columnName), x, length);
    }

    /**
     * JDBC 2.0  Update a column with a BigDecimal value. The updateXXX()
     * methods are used to update column values in the current row, or the
     * insert row.  The updateXXX() methods do not  update the underlying
     * database, instead the updateRow() or insertRow() methods are called to
     * update the database.
     *
     * @param columnIndex the first column is 1, the second is 2, ...
     * @param x the new column value
     *
     * @exception SQLException if a database-access error occurs
     */
    public synchronized void updateBigDecimal(int columnIndex, BigDecimal x)
        throws SQLException {
        if (!onInsertRow) {
            if (!doingUpdates) {
                doingUpdates = true;
                syncUpdate();
            }

            updater.setBigDecimal(columnIndex, x);
        } else {
            inserter.setBigDecimal(columnIndex, x);

            if (x == null) {
                this.thisRow[columnIndex - 1] = null;
            } else {
                this.thisRow[columnIndex - 1] = x.toString().getBytes();
            }
        }
    }

    /**
     * JDBC 2.0  Update a column with a BigDecimal value. The updateXXX()
     * methods are used to update column values in the current row, or the
     * insert row.  The updateXXX() methods do not  update the underlying
     * database, instead the updateRow() or insertRow() methods are called to
     * update the database.
     *
     * @param columnName the name of the column
     * @param x the new column value
     *
     * @exception SQLException if a database-access error occurs
     */
    public synchronized void updateBigDecimal(String columnName, BigDecimal x)
        throws SQLException {
        updateBigDecimal(findColumn(columnName), x);
    }

    /**
     * JDBC 2.0  Update a column with a binary stream value. The updateXXX()
     * methods are used to update column values in the current row, or the
     * insert row.  The updateXXX() methods do not  update the underlying
     * database, instead the updateRow() or insertRow() methods are called to
     * update the database.
     *
     * @param columnIndex the first column is 1, the second is 2, ...
     * @param x the new column value
     * @param length the length of the stream
     *
     * @exception SQLException if a database-access error occurs
     */
    public synchronized void updateBinaryStream(int columnIndex,
        java.io.InputStream x, int length) throws SQLException {
        if (!onInsertRow) {
            if (!doingUpdates) {
                doingUpdates = true;
                syncUpdate();
            }

            updater.setBinaryStream(columnIndex, x, length);
        } else {
            inserter.setBinaryStream(columnIndex, x, length);

            if (x == null) {
                this.thisRow[columnIndex - 1] = null;
            } else {
                this.thisRow[columnIndex - 1] = STREAM_DATA_MARKER;
            }
        }
    }

    /**
     * JDBC 2.0  Update a column with a binary stream value. The updateXXX()
     * methods are used to update column values in the current row, or the
     * insert row.  The updateXXX() methods do not  update the underlying
     * database, instead the updateRow() or insertRow() methods are called to
     * update the database.
     *
     * @param columnName the name of the column
     * @param x the new column value
     * @param length of the stream
     *
     * @exception SQLException if a database-access error occurs
     */
    public synchronized void updateBinaryStream(String columnName,
        java.io.InputStream x, int length) throws SQLException {
        updateBinaryStream(findColumn(columnName), x, length);
    }

    /**
     * @see ResultSet#updateBlob(int, Blob)
     */
    public synchronized void updateBlob(int columnIndex, java.sql.Blob blob)
        throws SQLException {
        if (!onInsertRow) {
            if (!doingUpdates) {
                doingUpdates = true;
                syncUpdate();
            }

            updater.setBlob(columnIndex, blob);
        } else {
            inserter.setBlob(columnIndex, blob);

            if (blob == null) {
                this.thisRow[columnIndex - 1] = null;
            } else {
                this.thisRow[columnIndex - 1] = STREAM_DATA_MARKER;
            }
        }
    }

    /**
     * @see ResultSet#updateBlob(String, Blob)
     */
    public void updateBlob(String columnName, java.sql.Blob blob)
        throws SQLException {
        updateBlob(findColumn(columnName), blob);
    }

    /**
     * JDBC 2.0  Update a column with a boolean value. The updateXXX() methods
     * are used to update column values in the current row, or the insert row.
     * The updateXXX() methods do not  update the underlying database, instead
     * the updateRow() or insertRow() methods are called to update the
     * database.
     *
     * @param columnIndex the first column is 1, the second is 2, ...
     * @param x the new column value
     *
     * @exception SQLException if a database-access error occurs
     */
    public synchronized void updateBoolean(int columnIndex, boolean x)
        throws SQLException {
        if (!onInsertRow) {
            if (!doingUpdates) {
                doingUpdates = true;
                syncUpdate();
            }

            updater.setBoolean(columnIndex, x);
        } else {
            inserter.setBoolean(columnIndex, x);

            this.thisRow[columnIndex - 1] = inserter.getBytes(1);
        }
    }

    /**
     * JDBC 2.0  Update a column with a boolean value. The updateXXX() methods
     * are used to update column values in the current row, or the insert row.
     * The updateXXX() methods do not  update the underlying database, instead
     * the updateRow() or insertRow() methods are called to update the
     * database.
     *
     * @param columnName the name of the column
     * @param x the new column value
     *
     * @exception SQLException if a database-access error occurs
     */
    public synchronized void updateBoolean(String columnName, boolean x)
        throws SQLException {
        updateBoolean(findColumn(columnName), x);
    }

    /**
     * JDBC 2.0  Update a column with a byte value. The updateXXX() methods are
     * used to update column values in the current row, or the insert row. The
     * updateXXX() methods do not  update the underlying database, instead the
     * updateRow() or insertRow() methods are called to update the database.
     *
     * @param columnIndex the first column is 1, the second is 2, ...
     * @param x the new column value
     *
     * @exception SQLException if a database-access error occurs
     */
    public synchronized void updateByte(int columnIndex, byte x)
        throws SQLException {
        if (!onInsertRow) {
            if (!doingUpdates) {
                doingUpdates = true;
                syncUpdate();
            }

            updater.setByte(columnIndex, x);
        } else {
            inserter.setByte(columnIndex, x);

            this.thisRow[columnIndex - 1] = inserter.getBytes(columnIndex - 1);
        }
    }

    /**
     * JDBC 2.0  Update a column with a byte value. The updateXXX() methods are
     * used to update column values in the current row, or the insert row. The
     * updateXXX() methods do not  update the underlying database, instead the
     * updateRow() or insertRow() methods are called to update the database.
     *
     * @param columnName the name of the column
     * @param x the new column value
     *
     * @exception SQLException if a database-access error occurs
     */
    public synchronized void updateByte(String columnName, byte x)
        throws SQLException {
        updateByte(findColumn(columnName), x);
    }

    /**
     * JDBC 2.0  Update a column with a byte array value. The updateXXX()
     * methods are used to update column values in the current row, or the
     * insert row.  The updateXXX() methods do not  update the underlying
     * database, instead the updateRow() or insertRow() methods are called to
     * update the database.
     *
     * @param columnIndex the first column is 1, the second is 2, ...
     * @param x the new column value
     *
     * @exception SQLException if a database-access error occurs
     */
    public synchronized void updateBytes(int columnIndex, byte[] x)
        throws SQLException {
        if (!onInsertRow) {
            if (!doingUpdates) {
                doingUpdates = true;
                syncUpdate();
            }

            updater.setBytes(columnIndex, x);
        } else {
            inserter.setBytes(columnIndex, x);

            this.thisRow[columnIndex - 1] = x;
        }
    }

    /**
     * JDBC 2.0  Update a column with a byte array value. The updateXXX()
     * methods are used to update column values in the current row, or the
     * insert row.  The updateXXX() methods do not  update the underlying
     * database, instead the updateRow() or insertRow() methods are called to
     * update the database.
     *
     * @param columnName the name of the column
     * @param x the new column value
     *
     * @exception SQLException if a database-access error occurs
     */
    public synchronized void updateBytes(String columnName, byte[] x)
        throws SQLException {
        updateBytes(findColumn(columnName), x);
    }

    /**
     * JDBC 2.0  Update a column with a character stream value. The updateXXX()
     * methods are used to update column values in the current row, or the
     * insert row.  The updateXXX() methods do not  update the underlying
     * database, instead the updateRow() or insertRow() methods are called to
     * update the database.
     *
     * @param columnIndex the first column is 1, the second is 2, ...
     * @param x the new column value
     * @param length the length of the stream
     *
     * @exception SQLException if a database-access error occurs
     */
    public synchronized void updateCharacterStream(int columnIndex,
        java.io.Reader x, int length) throws SQLException {
        if (!onInsertRow) {
            if (!doingUpdates) {
                doingUpdates = true;
                syncUpdate();
            }

            updater.setCharacterStream(columnIndex, x, length);
        } else {
            inserter.setCharacterStream(columnIndex, x, length);

            if (x == null) {
                this.thisRow[columnIndex - 1] = null;
            } else {
                this.thisRow[columnIndex - 1] = STREAM_DATA_MARKER;
            }
        }
    }

    /**
     * JDBC 2.0  Update a column with a character stream value. The updateXXX()
     * methods are used to update column values in the current row, or the
     * insert row.  The updateXXX() methods do not  update the underlying
     * database, instead the updateRow() or insertRow() methods are called to
     * update the database.
     *
     * @param columnName the name of the column
     * @param reader the new column value
     * @param length of the stream
     *
     * @exception SQLException if a database-access error occurs
     */
    public synchronized void updateCharacterStream(String columnName,
        java.io.Reader reader, int length) throws SQLException {
        updateCharacterStream(findColumn(columnName), reader, length);
    }
    
	/**
	  * @see ResultSet#updateClob(int, Clob)
	  */
	 public void updateClob(int columnIndex, java.sql.Clob clob) throws SQLException {
	 	 if (clob == null) {
	 	 	updateNull(columnIndex);
	 	 } else {
	 	 	updateCharacterStream(columnIndex, clob.getCharacterStream(), (int) clob.length());
	 	 }
	 }

    /**
     * JDBC 2.0  Update a column with a Date value. The updateXXX() methods are
     * used to update column values in the current row, or the insert row. The
     * updateXXX() methods do not  update the underlying database, instead the
     * updateRow() or insertRow() methods are called to update the database.
     *
     * @param columnIndex the first column is 1, the second is 2, ...
     * @param x the new column value
     *
     * @exception SQLException if a database-access error occurs
     */
    public synchronized void updateDate(int columnIndex, java.sql.Date x)
        throws SQLException {
        if (!onInsertRow) {
            if (!doingUpdates) {
                doingUpdates = true;
                syncUpdate();
            }

            updater.setDate(columnIndex, x);
        } else {
            inserter.setDate(columnIndex, x);

            this.thisRow[columnIndex - 1] = this.inserter.getBytes(columnIndex
                    - 1);
        }
    }

    /**
     * JDBC 2.0  Update a column with a Date value. The updateXXX() methods are
     * used to update column values in the current row, or the insert row. The
     * updateXXX() methods do not  update the underlying database, instead the
     * updateRow() or insertRow() methods are called to update the database.
     *
     * @param columnName the name of the column
     * @param x the new column value
     *
     * @exception SQLException if a database-access error occurs
     */
    public synchronized void updateDate(String columnName, java.sql.Date x)
        throws SQLException {
        updateDate(findColumn(columnName), x);
    }

    /**
     * JDBC 2.0  Update a column with a Double value. The updateXXX() methods
     * are used to update column values in the current row, or the insert row.
     * The updateXXX() methods do not  update the underlying database, instead
     * the updateRow() or insertRow() methods are called to update the
     * database.
     *
     * @param columnIndex the first column is 1, the second is 2, ...
     * @param x the new column value
     *
     * @exception SQLException if a database-access error occurs
     */
    public synchronized void updateDouble(int columnIndex, double x)
        throws SQLException {
        if (!onInsertRow) {
            if (!doingUpdates) {
                doingUpdates = true;
                syncUpdate();
            }

            updater.setDouble(columnIndex, x);
        } else {
            inserter.setDouble(columnIndex, x);

            this.thisRow[columnIndex - 1] = this.inserter.getBytes(columnIndex
                    - 1);
        }
    }

    /**
     * JDBC 2.0  Update a column with a double value. The updateXXX() methods
     * are used to update column values in the current row, or the insert row.
     * The updateXXX() methods do not  update the underlying database, instead
     * the updateRow() or insertRow() methods are called to update the
     * database.
     *
     * @param columnName the name of the column
     * @param x the new column value
     *
     * @exception SQLException if a database-access error occurs
     */
    public synchronized void updateDouble(String columnName, double x)
        throws SQLException {
        updateDouble(findColumn(columnName), x);
    }

    /**
     * JDBC 2.0  Update a column with a float value. The updateXXX() methods
     * are used to update column values in the current row, or the insert row.
     * The updateXXX() methods do not  update the underlying database, instead
     * the updateRow() or insertRow() methods are called to update the
     * database.
     *
     * @param columnIndex the first column is 1, the second is 2, ...
     * @param x the new column value
     *
     * @exception SQLException if a database-access error occurs
     */
    public synchronized void updateFloat(int columnIndex, float x)
        throws SQLException {
        if (!onInsertRow) {
            if (!doingUpdates) {
                doingUpdates = true;
                syncUpdate();
            }

            updater.setFloat(columnIndex, x);
        } else {
            inserter.setFloat(columnIndex, x);

            this.thisRow[columnIndex - 1] = this.inserter.getBytes(columnIndex
                    - 1);
        }
    }

    /**
     * JDBC 2.0  Update a column with a float value. The updateXXX() methods
     * are used to update column values in the current row, or the insert row.
     * The updateXXX() methods do not  update the underlying database, instead
     * the updateRow() or insertRow() methods are called to update the
     * database.
     *
     * @param columnName the name of the column
     * @param x the new column value
     *
     * @exception SQLException if a database-access error occurs
     */
    public synchronized void updateFloat(String columnName, float x)
        throws SQLException {
        updateFloat(findColumn(columnName), x);
    }

    /**
     * JDBC 2.0  Update a column with an integer value. The updateXXX() methods
     * are used to update column values in the current row, or the insert row.
     * The updateXXX() methods do not  update the underlying database, instead
     * the updateRow() or insertRow() methods are called to update the
     * database.
     *
     * @param columnIndex the first column is 1, the second is 2, ...
     * @param x the new column value
     *
     * @exception SQLException if a database-access error occurs
     */
    public synchronized void updateInt(int columnIndex, int x)
        throws SQLException {
        if (!onInsertRow) {
            if (!doingUpdates) {
                doingUpdates = true;
                syncUpdate();
            }

            updater.setInt(columnIndex, x);
        } else {
            inserter.setInt(columnIndex, x);

            this.thisRow[columnIndex - 1] = this.inserter.getBytes(columnIndex
                    - 1);
        }
    }

    /**
     * JDBC 2.0  Update a column with an integer value. The updateXXX() methods
     * are used to update column values in the current row, or the insert row.
     * The updateXXX() methods do not  update the underlying database, instead
     * the updateRow() or insertRow() methods are called to update the
     * database.
     *
     * @param columnName the name of the column
     * @param x the new column value
     *
     * @exception SQLException if a database-access error occurs
     */
    public synchronized void updateInt(String columnName, int x)
        throws SQLException {
        updateInt(findColumn(columnName), x);
    }

    /**
     * JDBC 2.0  Update a column with a long value. The updateXXX() methods are
     * used to update column values in the current row, or the insert row. The
     * updateXXX() methods do not  update the underlying database, instead the
     * updateRow() or insertRow() methods are called to update the database.
     *
     * @param columnIndex the first column is 1, the second is 2, ...
     * @param x the new column value
     *
     * @exception SQLException if a database-access error occurs
     */
    public synchronized void updateLong(int columnIndex, long x)
        throws SQLException {
        if (!onInsertRow) {
            if (!doingUpdates) {
                doingUpdates = true;
                syncUpdate();
            }

            updater.setLong(columnIndex, x);
        } else {
            inserter.setLong(columnIndex, x);

            this.thisRow[columnIndex - 1] = this.inserter.getBytes(columnIndex
                    - 1);
        }
    }

    /**
     * JDBC 2.0  Update a column with a long value. The updateXXX() methods are
     * used to update column values in the current row, or the insert row. The
     * updateXXX() methods do not  update the underlying database, instead the
     * updateRow() or insertRow() methods are called to update the database.
     *
     * @param columnName the name of the column
     * @param x the new column value
     *
     * @exception SQLException if a database-access error occurs
     */
    public synchronized void updateLong(String columnName, long x)
        throws SQLException {
        updateLong(findColumn(columnName), x);
    }

    /**
     * JDBC 2.0  Give a nullable column a null value.  The updateXXX() methods
     * are used to update column values in the current row, or the insert row.
     * The updateXXX() methods do not  update the underlying database, instead
     * the updateRow() or insertRow() methods are called to update the
     * database.
     *
     * @param columnIndex the first column is 1, the second is 2, ...
     *
     * @exception SQLException if a database-access error occurs
     */
    public synchronized void updateNull(int columnIndex)
        throws SQLException {
        if (!onInsertRow) {
            if (!doingUpdates) {
                doingUpdates = true;
                syncUpdate();
            }

            updater.setNull(columnIndex, 0);
        } else {
            inserter.setNull(columnIndex, 0);

            this.thisRow[columnIndex - 1] = null;
        }
    }

    /**
     * JDBC 2.0  Update a column with a null value. The updateXXX() methods are
     * used to update column values in the current row, or the insert row. The
     * updateXXX() methods do not  update the underlying database, instead the
     * updateRow() or insertRow() methods are called to update the database.
     *
     * @param columnName the name of the column
     *
     * @exception SQLException if a database-access error occurs
     */
    public synchronized void updateNull(String columnName)
        throws SQLException {
        updateNull(findColumn(columnName));
    }

    /**
     * JDBC 2.0  Update a column with an Object value. The updateXXX() methods
     * are used to update column values in the current row, or the insert row.
     * The updateXXX() methods do not  update the underlying database, instead
     * the updateRow() or insertRow() methods are called to update the
     * database.
     *
     * @param columnIndex the first column is 1, the second is 2, ...
     * @param x the new column value
     * @param scale For java.sql.Types.DECIMAL or java.sql.Types.NUMERIC types
     *        this is the number of digits after the decimal.  For all other
     *        types this value will be ignored.
     *
     * @exception SQLException if a database-access error occurs
     */
    public synchronized void updateObject(int columnIndex, Object x, int scale)
        throws SQLException {
        if (!onInsertRow) {
            if (!doingUpdates) {
                doingUpdates = true;
                syncUpdate();
            }

            updater.setObject(columnIndex, x);
        } else {
            inserter.setObject(columnIndex, x);

            this.thisRow[columnIndex - 1] = this.inserter.getBytes(columnIndex
                    - 1);
        }
    }

    /**
     * JDBC 2.0  Update a column with an Object value. The updateXXX() methods
     * are used to update column values in the current row, or the insert row.
     * The updateXXX() methods do not  update the underlying database, instead
     * the updateRow() or insertRow() methods are called to update the
     * database.
     *
     * @param columnIndex the first column is 1, the second is 2, ...
     * @param x the new column value
     *
     * @exception SQLException if a database-access error occurs
     */
    public synchronized void updateObject(int columnIndex, Object x)
        throws SQLException {
        if (!onInsertRow) {
            if (!doingUpdates) {
                doingUpdates = true;
                syncUpdate();
            }

            updater.setObject(columnIndex, x);
        } else {
            inserter.setObject(columnIndex, x);

            this.thisRow[columnIndex - 1] = this.inserter.getBytes(columnIndex
                    - 1);
        }
    }

    /**
     * JDBC 2.0  Update a column with an Object value. The updateXXX() methods
     * are used to update column values in the current row, or the insert row.
     * The updateXXX() methods do not  update the underlying database, instead
     * the updateRow() or insertRow() methods are called to update the
     * database.
     *
     * @param columnName the name of the column
     * @param x the new column value
     * @param scale For java.sql.Types.DECIMAL or java.sql.Types.NUMERIC types
     *        this is the number of digits after the decimal.  For all other
     *        types this value will be ignored.
     *
     * @exception SQLException if a database-access error occurs
     */
    public synchronized void updateObject(String columnName, Object x, int scale)
        throws SQLException {
        updateObject(findColumn(columnName), x);
    }

    /**
     * JDBC 2.0  Update a column with an Object value. The updateXXX() methods
     * are used to update column values in the current row, or the insert row.
     * The updateXXX() methods do not  update the underlying database, instead
     * the updateRow() or insertRow() methods are called to update the
     * database.
     *
     * @param columnName the name of the column
     * @param x the new column value
     *
     * @exception SQLException if a database-access error occurs
     */
    public synchronized void updateObject(String columnName, Object x)
        throws SQLException {
        updateObject(findColumn(columnName), x);
    }

    /**
     * JDBC 2.0 Update the underlying database with the new contents of the
     * current row.  Cannot be called when on the insert row.
     *
     * @exception SQLException if a database-access error occurs, or if called
     *            when on the insert row
     * @throws NotUpdatable DOCUMENT ME!
     */
    public synchronized void updateRow() throws SQLException {
        if (!isUpdatable) {
            throw new NotUpdatable();
        }

        if (doingUpdates) {
            updater.executeUpdate();
            refreshRow();
            doingUpdates = false;
        }

        //
        // fixes calling updateRow() and then doing more
        // updates on same row...
        syncUpdate();
    }

    /**
     * JDBC 2.0  Update a column with a short value. The updateXXX() methods
     * are used to update column values in the current row, or the insert row.
     * The updateXXX() methods do not  update the underlying database, instead
     * the updateRow() or insertRow() methods are called to update the
     * database.
     *
     * @param columnIndex the first column is 1, the second is 2, ...
     * @param x the new column value
     *
     * @exception SQLException if a database-access error occurs
     */
    public synchronized void updateShort(int columnIndex, short x)
        throws SQLException {
        if (!onInsertRow) {
            if (!doingUpdates) {
                doingUpdates = true;
                syncUpdate();
            }

            updater.setShort(columnIndex, x);
        } else {
            inserter.setShort(columnIndex, x);

            this.thisRow[columnIndex - 1] = this.inserter.getBytes(columnIndex
                    - 1);
        }
    }

    /**
     * JDBC 2.0  Update a column with a short value. The updateXXX() methods
     * are used to update column values in the current row, or the insert row.
     * The updateXXX() methods do not  update the underlying database, instead
     * the updateRow() or insertRow() methods are called to update the
     * database.
     *
     * @param columnName the name of the column
     * @param x the new column value
     *
     * @exception SQLException if a database-access error occurs
     */
    public synchronized void updateShort(String columnName, short x)
        throws SQLException {
        updateShort(findColumn(columnName), x);
    }

    /**
     * JDBC 2.0  Update a column with a String value. The updateXXX() methods
     * are used to update column values in the current row, or the insert row.
     * The updateXXX() methods do not  update the underlying database, instead
     * the updateRow() or insertRow() methods are called to update the
     * database.
     *
     * @param columnIndex the first column is 1, the second is 2, ...
     * @param x the new column value
     *
     * @exception SQLException if a database-access error occurs
     */
    public synchronized void updateString(int columnIndex, String x)
        throws SQLException {
        if (!onInsertRow) {
            if (!doingUpdates) {
                doingUpdates = true;
                syncUpdate();
            }

            updater.setString(columnIndex, x);
        } else {
            inserter.setString(columnIndex, x);

            if (x == null) {
                this.thisRow[columnIndex - 1] = null;
            } else {
                if (getCharConverter() != null) {
                    try {
                        this.thisRow[columnIndex - 1] = StringUtils.getBytes(x,
                                this.charConverter, this.charEncoding, 
                                this.connection.getServerCharacterEncoding(),
								this.connection.parserKnowsUnicode());
                    } catch (UnsupportedEncodingException uEE) {
                        throw new SQLException(
                            "Unsupported character encoding '"
                            + this.charEncoding + "'", SQLError.SQL_STATE_ILLEGAL_ARGUMENT);
                    }
                } else {
                    this.thisRow[columnIndex - 1] = x.getBytes();
                }
            }
        }
    }

    /**
     * JDBC 2.0  Update a column with a String value. The updateXXX() methods
     * are used to update column values in the current row, or the insert row.
     * The updateXXX() methods do not  update the underlying database, instead
     * the updateRow() or insertRow() methods are called to update the
     * database.
     *
     * @param columnName the name of the column
     * @param x the new column value
     *
     * @exception SQLException if a database-access error occurs
     */
    public synchronized void updateString(String columnName, String x)
        throws SQLException {
        updateString(findColumn(columnName), x);
    }

    /**
     * JDBC 2.0  Update a column with a Time value. The updateXXX() methods are
     * used to update column values in the current row, or the insert row. The
     * updateXXX() methods do not  update the underlying database, instead the
     * updateRow() or insertRow() methods are called to update the database.
     *
     * @param columnIndex the first column is 1, the second is 2, ...
     * @param x the new column value
     *
     * @exception SQLException if a database-access error occurs
     */
    public synchronized void updateTime(int columnIndex, java.sql.Time x)
        throws SQLException {
        if (!onInsertRow) {
            if (!doingUpdates) {
                doingUpdates = true;
                syncUpdate();
            }

            updater.setTime(columnIndex, x);
        } else {
            inserter.setTime(columnIndex, x);

            this.thisRow[columnIndex - 1] = this.inserter.getBytes(columnIndex
                    - 1);
        }
    }

    /**
     * JDBC 2.0  Update a column with a Time value. The updateXXX() methods are
     * used to update column values in the current row, or the insert row. The
     * updateXXX() methods do not  update the underlying database, instead the
     * updateRow() or insertRow() methods are called to update the database.
     *
     * @param columnName the name of the column
     * @param x the new column value
     *
     * @exception SQLException if a database-access error occurs
     */
    public synchronized void updateTime(String columnName, java.sql.Time x)
        throws SQLException {
        updateTime(findColumn(columnName), x);
    }

    /**
     * JDBC 2.0  Update a column with a Timestamp value. The updateXXX()
     * methods are used to update column values in the current row, or the
     * insert row.  The updateXXX() methods do not  update the underlying
     * database, instead the updateRow() or insertRow() methods are called to
     * update the database.
     *
     * @param columnIndex the first column is 1, the second is 2, ...
     * @param x the new column value
     *
     * @exception SQLException if a database-access error occurs
     */
    public synchronized void updateTimestamp(int columnIndex,
        java.sql.Timestamp x) throws SQLException {
        if (!onInsertRow) {
            if (!doingUpdates) {
                doingUpdates = true;
                syncUpdate();
            }

            updater.setTimestamp(columnIndex, x);
        } else {
            inserter.setTimestamp(columnIndex, x);

            this.thisRow[columnIndex - 1] = this.inserter.getBytes(columnIndex
                    - 1);
        }
    }

    /**
     * JDBC 2.0  Update a column with a Timestamp value. The updateXXX()
     * methods are used to update column values in the current row, or the
     * insert row.  The updateXXX() methods do not  update the underlying
     * database, instead the updateRow() or insertRow() methods are called to
     * update the database.
     *
     * @param columnName the name of the column
     * @param x the new column value
     *
     * @exception SQLException if a database-access error occurs
     */
    public synchronized void updateTimestamp(String columnName,
        java.sql.Timestamp x) throws SQLException {
        updateTimestamp(findColumn(columnName), x);
    }

    /**
     * Sets the concurrency type of this result set
     *
     * @param concurrencyFlag the type of concurrency that this ResultSet
     *        should support.
     */
    protected void setResultSetConcurrency(int concurrencyFlag) {
        super.setResultSetConcurrency(concurrencyFlag);

        //
        // FIXME: Issue warning when asked for updateable result set, but result set is not
        // updatable
        //
        //if ((concurrencyFlag == CONCUR_UPDATABLE) && !isUpdatable()) {
        //java.sql.SQLWarning warning = new java.sql.SQLWarning(
        //NotUpdatable.NOT_UPDATEABLE_MESSAGE);
        //}
    }

    protected void checkRowPos() throws SQLException {
        // don't use RowData's idea of
        // row bounds when we're doing
        // inserts...
        if (!this.onInsertRow) {
            super.checkRowPos();
        }
    }

    /**
     * Figure out whether or not this ResultSet is updateable, and if so,
     * generate the PreparedStatements to support updates.
     *
     * @throws SQLException DOCUMENT ME!
     * @throws NotUpdatable DOCUMENT ME!
     */
    protected synchronized void generateStatements() throws SQLException {
        if (!isUpdatable) {
        	this.doingUpdates = false;
        	this.onInsertRow = false;
        	
            throw new NotUpdatable();
        }

        String quotedId = getQuotedIdChar();

        this.qualifiedAndQuotedTableName = null;
        this.tableOnlyName = null;

        if (fields[0].getOriginalTableName() != null) {
            StringBuffer tableNameBuffer = new StringBuffer();

            String databaseName = fields[0].getDatabaseName();

            if ((databaseName != null) && (databaseName.length() > 0)) {
                tableNameBuffer.append(quotedId);
                tableNameBuffer.append(databaseName);
                tableNameBuffer.append(quotedId);
                tableNameBuffer.append('.');
            }

            this.tableOnlyName = fields[0].getOriginalTableName();
            
            tableNameBuffer.append(quotedId);
            tableNameBuffer.append(this.tableOnlyName);
            tableNameBuffer.append(quotedId);

            
            this.qualifiedAndQuotedTableName = tableNameBuffer.toString();
        } else {
            StringBuffer tableNameBuffer = new StringBuffer();

            this.tableOnlyName = fields[0].getTableName();
            
            tableNameBuffer.append(quotedId);
            tableNameBuffer.append(this.tableOnlyName);
            tableNameBuffer.append(quotedId);

            this.qualifiedAndQuotedTableName = tableNameBuffer.toString();
        }

        primaryKeyIndicies = new ArrayList();

        StringBuffer fieldValues = new StringBuffer();
        StringBuffer keyValues = new StringBuffer();
        StringBuffer columnNames = new StringBuffer();
        StringBuffer insertPlaceHolders = new StringBuffer();
        boolean firstTime = true;
        boolean keysFirstTime = true;

        for (int i = 0; i < fields.length; i++) {
            String originalColumnName = fields[i].getOriginalName();
            String columnName = null;

            if (this.connection.getIO().hasLongColumnInfo()
                    && (originalColumnName != null)
                    && (originalColumnName.length() > 0)) {
                columnName = originalColumnName;
            } else {
                columnName = fields[i].getName();
            }

            if (fields[i].isPrimaryKey()) {
                primaryKeyIndicies.add(new Integer(i));

                if (!keysFirstTime) {
                    keyValues.append(" AND ");
                } else {
                    keysFirstTime = false;
                }

                keyValues.append(quotedId);
                keyValues.append(columnName);
                keyValues.append(quotedId);
                keyValues.append("=?");
            }

            if (firstTime) {
                firstTime = false;
                fieldValues.append("SET ");
            } else {
                fieldValues.append(",");
                columnNames.append(",");
                insertPlaceHolders.append(",");
            }

            insertPlaceHolders.append("?");

            columnNames.append(quotedId);
            columnNames.append(columnName);
            columnNames.append(quotedId);

            fieldValues.append(quotedId);
            fieldValues.append(columnName);
            fieldValues.append(quotedId);
            fieldValues.append("=?");
        }

        updateSQL = "UPDATE " + this.qualifiedAndQuotedTableName + " " + fieldValues.toString()
            + " WHERE " + keyValues.toString();
        insertSQL = "INSERT INTO " + this.qualifiedAndQuotedTableName + " ("
            + columnNames.toString() + ") VALUES ("
            + insertPlaceHolders.toString() + ")";
        refreshSQL = "SELECT " + columnNames.toString() + " FROM " + qualifiedAndQuotedTableName
            + " WHERE " + keyValues.toString();
        deleteSQL = "DELETE FROM " + this.qualifiedAndQuotedTableName + " WHERE "
            + keyValues.toString();
    }

    synchronized boolean isUpdatable() {
        return this.isUpdatable;
    }

    /**
     * Reset UPDATE prepared statement to value in current row.  This_Row MUST
     * point to current, valid row.
     *
     * @throws SQLException DOCUMENT ME!
     */
    synchronized void syncUpdate() throws SQLException {
        if (updater == null) {
            if (updateSQL == null) {
                generateStatements();
            }

            updater = (com.mysql.jdbc.PreparedStatement) connection
                .prepareStatement(updateSQL);
            
            if (updater.getMaxRows() != 0) {
            	updater.setMaxRows(0);
            }
        }

        int numFields = fields.length;
        updater.clearParameters();

        for (int i = 0; i < numFields; i++) {
            if (thisRow[i] != null) {
                updater.setBytes(i + 1, thisRow[i], this.fields[i].isBinary(), false);
            } else {
                updater.setNull(i + 1, 0);
            }
        }

        int numKeys = primaryKeyIndicies.size();

        if (numKeys == 1) {
            int index = ((Integer) primaryKeyIndicies.get(0)).intValue();
            byte[] keyData = thisRow[index];
            updater.setBytes(numFields + 1, keyData, false, false);
        } else {
            for (int i = 0; i < numKeys; i++) {
                byte[] currentVal = thisRow[((Integer) primaryKeyIndicies.get(i))
                    .intValue()];

                if (currentVal != null) {
                    updater.setBytes(numFields + i + 1, currentVal, false, false);
                } else {
                    updater.setNull(numFields + i + 1, 0);
                }
            }
        }
    }

    private boolean initializedCharConverter = false;
    
    private synchronized SingleByteCharsetConverter getCharConverter()
        throws SQLException {
        if (!this.initializedCharConverter) {
        	this.initializedCharConverter = true;
        	
            if (this.connection.useUnicode()) {
                this.charEncoding = connection.getEncoding();
                this.charConverter = this.connection.getCharsetConverter(this.charEncoding);
            }
        }

        return this.charConverter;
    }

    private synchronized String getQuotedIdChar() throws SQLException {
        if (this.quotedIdChar == null) {
            boolean useQuotedIdentifiers = connection.supportsQuotedIdentifiers();

            if (useQuotedIdentifiers) {
                java.sql.DatabaseMetaData dbmd = connection.getMetaData();
                this.quotedIdChar = dbmd.getIdentifierQuoteString();
            } else {
                this.quotedIdChar = "";
            }
        }

        return this.quotedIdChar;
    }

    /**
     * DOCUMENT ME!
     *
     * @param field
     *
     * @return String
     */
    private String getTableName(Field field) {
        String originalTableName = field.getOriginalTableName();

        if ((originalTableName != null) && (originalTableName.length() > 0)) {
            return originalTableName;
        } else {
            return field.getTableName();
        }
    }

    /**
     * Is this ResultSet updateable?
     *
     * @return DOCUMENT ME!
     *
     * @throws SQLException DOCUMENT ME!
     */
	private boolean checkUpdatability() throws SQLException {
		String tableName = null;
		String catalogName = null;

		int primaryKeyCount = 0;

		if (fields.length > 0) {
			
			tableName = fields[0].getOriginalTableName();
            catalogName = fields[0].getDatabaseName();
            
			if (tableName == null) {
				tableName = fields[0].getTableName();
				catalogName = this.catalog;
			}

			if (fields[0].isPrimaryKey()) {
				primaryKeyCount++;
			}

			//
			// References only one table?
			//
			for (int i = 1; i < fields.length; i++) {
				String otherTableName = fields[i].getOriginalTableName();
            	
				String otherCatalogName = fields[i].getDatabaseName();
				
				if (otherTableName == null) {
					otherTableName = fields[i].getTableName();
					otherCatalogName = this.catalog;
				}
            	
				// Can't have more than one table
				if ((tableName == null)
						|| !otherTableName.equals(tableName)) {
					return false;
				}

				// Can't reference more than one database
				if ((catalogName == null) || !otherCatalogName.equals(catalogName)) {
					return false;
				}
				
				if (fields[i].isPrimaryKey()) {
					primaryKeyCount++;
				}
			}

			if ((tableName == null) || (tableName.length() == 0)) {
				return false;
			}
		} else {
			return false;
		}

		// 
		// Must have at least one primary key
		//
		if (primaryKeyCount == 0) {
			return false;
		}

		// We can only do this if we know that there is a currently
		// selected database, or if we're talking to a > 4.1 version
		// of MySQL server (as it returns database names in field
		// info)
		//
		if ((this.catalog == null) || (this.catalog.length() == 0)) {
			this.catalog = fields[0].getDatabaseName();

			if ((this.catalog == null) || (this.catalog.length() == 0)) {
				throw new SQLException(
				"Can not create updatable result sets when there is no currently selected database"
				+ " and MySQL server version < 4.1", SQLError.SQL_STATE_ILLEGAL_ARGUMENT);
			}
		}

		if (this.connection.useStrictUpdates()) {
			java.sql.DatabaseMetaData dbmd = this.connection.getMetaData();

			java.sql.ResultSet rs = null;
			HashMap primaryKeyNames = new HashMap();

			try {
				rs = dbmd.getPrimaryKeys(catalogName, null, tableName);

				while (rs.next()) {
					String keyName = rs.getString(4);
					keyName = keyName.toUpperCase();
					primaryKeyNames.put(keyName, keyName);
				}
			} finally {
				if (rs != null) {
					try {
						rs.close();
					} catch (Exception ex) {
						AssertionFailedException.shouldNotHappen(ex);
					}

					rs = null;
				}
			}

			if (primaryKeyNames.size() == 0) {
				return false; // we can't update tables w/o keys
			}

			//
			// Contains all primary keys?
			//
			for (int i = 0; i < fields.length; i++) {
				if (fields[i].isPrimaryKey()) {
					String columnNameUC = fields[i].getName().toUpperCase();

					if (primaryKeyNames.remove(columnNameUC) == null) {
						// try original name
						String originalName = fields[i].getOriginalName();

						if (originalName != null) {
							if (primaryKeyNames.remove(
										originalName.toUpperCase()) == null) {
								// we don't know about this key, so give up :(
								return false;
							}
						}
					}
				}
			}

			return primaryKeyNames.isEmpty();
		}

		return true;
	}

    private synchronized void extractDefaultValues() throws SQLException {
        java.sql.DatabaseMetaData dbmd = this.connection.getMetaData();

        java.sql.ResultSet columnsResultSet = null;

        try {
           
            columnsResultSet = dbmd.getColumns(this.catalog, null,
                    this.tableOnlyName, "%");

            HashMap columnNameToDefaultValueMap = new HashMap(this.fields.length /* at least this big... */);

            while (columnsResultSet.next()) {
                String columnName = columnsResultSet.getString("COLUMN_NAME");
                byte[] defaultValue = columnsResultSet.getBytes("COLUMN_DEF");

                columnNameToDefaultValueMap.put(columnName, defaultValue);
            }

            int numFields = this.fields.length;

            this.defaultColumnValue = new byte[numFields][];

            for (int i = 0; i < numFields; i++) {
                String tableName = this.fields[i].getOriginalName();

                if ((tableName == null) || (tableName.length() == 0)) {
                    tableName = this.fields[i].getName();
                }

                if (tableName != null) {
                    byte[] defaultVal = (byte[]) columnNameToDefaultValueMap
                        .get(tableName);

                    this.defaultColumnValue[i] = defaultVal;
                }
            }
        } finally {
            if (columnsResultSet != null) {
                columnsResultSet.close();

                columnsResultSet = null;
            }
        }
    }

    private void resetInserter() throws SQLException {
        inserter.clearParameters();

        for (int i = 0; i < fields.length; i++) {
            inserter.setNull(i + 1, 0);
        }
    }
}
