org.apache.empire.db.expr.join

Class DBCompareJoinExpr

java.lang.Object

org.apache.empire.db.DBObject

org.apache.empire.db.DBExpr

org.apache.empire.db.expr.join.DBJoinExpr

org.apache.empire.db.expr.join.DBColumnJoinExpr

org.apache.empire.db.expr.join.DBCompareJoinExpr

All Implemented Interfaces:

DBPreparable

public class DBCompareJoinExpr
extends DBColumnJoinExpr

This class is used for building a join expression of an SQL statement.

There is no need to explicitly create instances of this class.
Instead use @link DBCommand.join(DBRowSet, DBCompareExpr, DBJoinType)

Field Summary

Fields

Modifier and Type	Field and Description
protected DBCompareExpr	cmp

Fields inherited from class org.apache.empire.db.expr.join.DBColumnJoinExpr

compExpr, left, right

Fields inherited from class org.apache.empire.db.expr.join.DBJoinExpr

type

Fields inherited from class org.apache.empire.db.DBExpr

CTX_ALIAS, CTX_ALL, CTX_DEFAULT, CTX_FULLNAME, CTX_NAME, CTX_NOPARENTHESIS, CTX_VALUE

Constructor Summary

Constructors

Constructor and Description
DBCompareJoinExpr(DBRowSet rset, DBCompareExpr cmp, DBJoinType joinType) Constructs a new DBJoinExprEx

Method Summary

Modifier and Type	Method and Description
void	addSQL(DBSQLBuilder sql, long context) Not allowed, this operation have to be done in the DBCommand object.
DBJoinExpr	copy(DBCommand newCmd) Copy Command
DBCompareExpr	getJoinConstraint()
void	prepareParams(DBCommand cmd, DBExpr parent) Prepares an expression for a query This function is called by DBCommand in order to add values as query parameters instead of being literally included in the sql statement Please Note: This function is internally called.

Methods inherited from class org.apache.empire.db.expr.join.DBColumnJoinExpr

addReferencedColumns, and, and, equals, getDatabase, getLeft, getLeftTable, getOuterTable, getRight, getRightTable, getWhere, isJoinOn, isJoinOn, reverse, toString, where

Methods inherited from class org.apache.empire.db.expr.join.DBJoinExpr

getType, setType

Methods inherited from class org.apache.empire.db.DBObject

checkParamNull

Methods inherited from class java.lang.Object

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

Field Detail

cmp

protected final DBCompareExpr cmp

Constructor Detail

DBCompareJoinExpr

public DBCompareJoinExpr(DBRowSet rset,
                         DBCompareExpr cmp,
                         DBJoinType joinType)

Constructs a new DBJoinExprEx

Parameters:

rset - the rowset

cmp - the compare expression

joinType - the join type

Method Detail

prepareParams

public void prepareParams(DBCommand cmd,
                          DBExpr parent)

Description copied from interface: DBPreparable

Prepares an expression for a query This function is called by DBCommand in order to add values as query parameters instead of being literally included in the sql statement Please Note: This function is internally called. Do not call yourself!

Specified by:

prepareParams in interface DBPreparable

Overrides:

prepareParams in class DBColumnJoinExpr

Parameters:

cmd - the command to which to add the parameters

parent - the parent expression holding the value

copy

public DBJoinExpr copy(DBCommand newCmd)

Copy Command

Overrides:

copy in class DBColumnJoinExpr

Parameters:

newCmd - the new command object

Returns:

the join expression

getJoinConstraint

public DBCompareExpr getJoinConstraint()

addSQL

public void addSQL(DBSQLBuilder sql,
                   long context)

Description copied from class: DBColumnJoinExpr

Not allowed, this operation have to be done in the DBCommand object.

Overrides:

addSQL in class DBColumnJoinExpr

Parameters:

sql - the string buffer used to build the sql command

context - context flag for this SQL-Command (see CTX_??? constants).