com.caucho.db.sql

Class ExistsEvalExpr

java.lang.Object

com.caucho.db.sql.Expr

com.caucho.db.sql.ExistsEvalExpr

public class ExistsEvalExpr
extends Expr

Field Summary

Fields

Modifier and Type	Field and Description
protected static L10N	L

Fields inherited from class com.caucho.db.sql.Expr

FALSE, TRUE, UNKNOWN

Method Summary

Modifier and Type	Method and Description
int	evalBoolean(QueryContext context) Evaluates the expression as a boolean.
java.lang.String	evalString(QueryContext context) Evaluates the expression as a string.
java.lang.Class	getType() Returns the expected result type of the expression.
long	subCost(java.util.ArrayList<FromItem> fromList) Returns the cost based on the given FromList.
java.lang.String	toString()

Methods inherited from class com.caucho.db.sql.Expr

bind, cost, createOrder, evalBytes, evalDate, evalDouble, evalEqual, evalEqual, evalGroup, evalLong, evalStream, evalToBuffer, evalToBuffer, evalToResult, getIndexExpr, getName, getSQLType, getTable, getTypeCode, indexCost, indexSubCost, initGroup, isBinaryStream, isBoolean, isDouble, isLong, isNull, isNullable, isParam, isSelect, splitAnd, updateDouble, updateLong, updateString

Methods inherited from class java.lang.Object

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

Field Detail

L

protected static final L10N L

Method Detail

getType

public java.lang.Class getType()

Returns the expected result type of the expression.

Overrides:

getType in class Expr

subCost

public long subCost(java.util.ArrayList<FromItem> fromList)

Returns the cost based on the given FromList.

Overrides:

subCost in class Expr

evalBoolean

public int evalBoolean(QueryContext context)
                throws java.sql.SQLException

Evaluates the expression as a boolean.

Overrides:

evalBoolean in class Expr

Parameters:

rows - the current database tuple

Returns:

the string value

Throws:

java.sql.SQLException

evalString

public java.lang.String evalString(QueryContext context)
                            throws java.sql.SQLException

Evaluates the expression as a string.

Overrides:

evalString in class Expr

Parameters:

rows - the current database tuple

Returns:

the string value

Throws:

java.sql.SQLException

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object