org.datanucleus.query.expression
Class SubqueryExpression

java.lang.Object
  org.datanucleus.query.expression.Expression
      org.datanucleus.query.expression.SubqueryExpression

All Implemented Interfaces:

Serializable

public class SubqueryExpression
extends Expression

Expression containing a subquery. A subquery is formed from a keyword and a variable expression representing the subquery, so something like

KEYWORD(subquery)

e.g

EXISTS (SELECT 1 FROM MYTABLE WHERE MYID = 4)

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class org.datanucleus.query.expression.Expression

Expression.DyadicOperator, Expression.MonadicOperator, Expression.Operator

Field Summary

Fields inherited from class org.datanucleus.query.expression.Expression

alias, left, LOCALISER, op, OP_ADD, OP_AND, OP_CAST, OP_COM, OP_CONCAT, OP_DISTINCT, OP_DIV, OP_EQ, OP_GT, OP_GTEQ, OP_IN, OP_IS, OP_ISNOT, OP_LIKE, OP_LT, OP_LTEQ, OP_MOD, OP_MUL, OP_NEG, OP_NOT, OP_NOTEQ, OP_NOTIN, OP_OR, OP_SUB, parent, right, symbol

Constructor Summary

SubqueryExpression(String keyword, VariableExpression operand)

Method Summary

Symbol	bind(SymbolTable symtbl) Method to bind the expression to the symbol table as appropriate.
String	getKeyword()
String	toString()

Methods inherited from class org.datanucleus.query.expression.Expression

evaluate, getAlias, getLeft, getOperator, getParent, getRight, getSymbol, setAlias, setLeft, setRight

Methods inherited from class java.lang.Object

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

Constructor Detail

SubqueryExpression

public SubqueryExpression(String keyword,
                          VariableExpression operand)

Parameters:

keyword - The keyword on the subquery

operand - The variable expression representing the subquery

Method Detail

bind

public Symbol bind(SymbolTable symtbl)

Description copied from class: Expression

Method to bind the expression to the symbol table as appropriate.

Specified by:

bind in class Expression

Parameters:

symtbl - Symbol table

Returns:

The symbol for this expression

getKeyword

public String getKeyword()

toString

public String toString()

Overrides:

toString in class Object