Package com.rosivanyshyn.utils

Class MySQLQueryBuilder

java.lang.Object

com.rosivanyshyn.utils.MySQLQueryBuilder

public class MySQLQueryBuilder
extends Object

MySQL Query Builder.
It contains methods to build dynamic query depends on business requirements.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static enum	MySQLQueryBuilder.LogicalOperation

Field Summary

Fields

Modifier and Type	Field	Description
protected String	label
protected StringBuilder	where

Constructor Summary

Constructors

Constructor	Description
MySQLQueryBuilder()

Method Summary

Modifier and Type	Method	Description
protected void	addWhere(String clause, boolean and)	Combine several filters
void	clear()	Clear query builder
void	excludeJoin(String table, String label, String tableField, String field)	Returns rows of current table, that are not exist in table B
String	getQuery()	Build the query from all the previous added parts.
void	join(String table, String label, String tableField, String field)	Returns rows of current table, that are existed in table B
void	limit(Integer offset, Integer limit)	Specify the number of records to return.
void	order(String field, boolean desc)	Sort records by field in ascending or descending order.
void	setLabel(String label)	Setter
void	subcondition(Boolean state)	Open or close new sub-condition in WHERE clause
void	where(String field, MySQLQueryBuilder.LogicalOperation logicalOperation, boolean and)	Filter the table by the specified field

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

label

protected String label

where

protected StringBuilder where

Constructor Details

MySQLQueryBuilder

public MySQLQueryBuilder()

Method Details

setLabel

public void setLabel(String label)

Setter

Parameters:

label - name of DB table

join

public void join(String table,
 String label,
 String tableField,
 String field)

Returns rows of current table, that are existed in table B

Parameters:

table - table to comparisons

label - abbreviation of the compared table name

tableField - field name of the compared table

field - field name of current table

excludeJoin

public void excludeJoin(String table,
 String label,
 String tableField,
 String field)

Returns rows of current table, that are not exist in table B

Parameters:

table - table to comparisons

label - abbreviation of the compared table name

tableField - field name of the compared table

field - field name of current table

where

public void where(String field,
 MySQLQueryBuilder.LogicalOperation logicalOperation,
 boolean and)

Filter the table by the specified field

Parameters:

field - field by which to filter

and - combining with previous condition. True -> the preconditions, including the new one, must be true to return records. False -> return a records if any of the conditions is true.

addWhere

protected void addWhere(String clause,
 boolean and)

Combine several filters

Parameters:

clause - new filter

and - Combining with previous condition. True -> the preconditions, including the new one, must be true to return records. False -> return a records if any of the conditions is true.

subcondition

public void subcondition(Boolean state)

Open or close new sub-condition in WHERE clause

Parameters:

state - - State of condition. True - open new sub-condition. False - close previous sub-condition

limit

public void limit(Integer offset,
 Integer limit)

Specify the number of records to return.

Parameters:

offset - which record to start sampling from

limit - records count to get

order

public void order(String field,
 boolean desc)

Sort records by field in ascending or descending order.

Parameters:

field - field by which to sort

desc - if true -> sort in descending order

getQuery

public String getQuery()

Build the query from all the previous added parts.

Returns:

string represent of query.

clear

public void clear()

Clear query builder