com.caucho.amber.expr
Class ExistsExpr

java.lang.Object
  com.caucho.amber.expr.AbstractAmberExpr
      com.caucho.amber.expr.ExistsExpr

All Implemented Interfaces:

AmberExpr

public class ExistsExpr
extends AbstractAmberExpr

Represents an exists query expression

Field Summary

Fields inherited from interface com.caucho.amber.expr.AmberExpr

IS_INNER_JOIN, USES_DATA

Constructor Summary

ExistsExpr(AmberSelectQuery query)

Method Summary

AmberExpr	bindSelect(QueryParser parser) Binds the expression as a select item.
void	generateHaving(CharBuffer cb) Generates the having expression.
void	generateUpdateWhere(CharBuffer cb) Generates the (update) where expression.
void	generateWhere(CharBuffer cb) Generates the where expression.
boolean	isBoolean() Returns true for a boolean expression.
boolean	usesFrom(FromItem from, int type, boolean isNot) Returns true if the expression uses the from item.

Methods inherited from class com.caucho.amber.expr.AbstractAmberExpr

createBoolean, exists, exists, findItem, generateJoin, generateSelect, getCacheObject, getColumnCount, getObject, getType, hasRelationship, replaceJoin, setInternalArgType, usesFrom

Methods inherited from class java.lang.Object

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

Constructor Detail

ExistsExpr

public ExistsExpr(AmberSelectQuery query)

Method Detail

bindSelect

public AmberExpr bindSelect(QueryParser parser)

Binds the expression as a select item.

Specified by:

bindSelect in interface AmberExpr

Specified by:

bindSelect in class AbstractAmberExpr

isBoolean

public boolean isBoolean()

Returns true for a boolean expression.

Specified by:

isBoolean in interface AmberExpr

Overrides:

isBoolean in class AbstractAmberExpr

usesFrom

public boolean usesFrom(FromItem from,
                        int type,
                        boolean isNot)

Returns true if the expression uses the from item.

Specified by:

usesFrom in interface AmberExpr

Overrides:

usesFrom in class AbstractAmberExpr

generateWhere

public void generateWhere(CharBuffer cb)

Generates the where expression.

Specified by:

generateWhere in interface AmberExpr

Overrides:

generateWhere in class AbstractAmberExpr

generateUpdateWhere

public void generateUpdateWhere(CharBuffer cb)

Generates the (update) where expression.

Specified by:

generateUpdateWhere in interface AmberExpr

Overrides:

generateUpdateWhere in class AbstractAmberExpr

generateHaving

public void generateHaving(CharBuffer cb)

Generates the having expression.

Specified by:

generateHaving in interface AmberExpr

Overrides:

generateHaving in class AbstractAmberExpr