org.datanucleus.store.mapped.expression
Class SubqueryExpression

java.lang.Object
  org.datanucleus.store.mapped.expression.ScalarExpression
      org.datanucleus.store.mapped.expression.BooleanExpression
          org.datanucleus.store.mapped.expression.SubqueryExpression

public class SubqueryExpression
extends BooleanExpression

An expression representing a subquery.

Version:

$Revision: 1.6 $

Nested Class Summary

Nested classes/interfaces inherited from class org.datanucleus.store.mapped.expression.ScalarExpression

ScalarExpression.DatastoreFieldExpression, ScalarExpression.DyadicOperator, ScalarExpression.ExpressionList, ScalarExpression.IllegalArgumentTypeException, ScalarExpression.IllegalOperationException, ScalarExpression.MethodInvocationException, ScalarExpression.MonadicOperator, ScalarExpression.Operator

Field Summary

Fields inherited from class org.datanucleus.store.mapped.expression.ScalarExpression

aliasIdentifier, checkForTypeAssignability, expressionList, FILTER, LOCALISER, lowestOperator, mapping, OP_ADD, OP_AND, OP_BETWEEN, OP_COM, OP_CONCAT, 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_NOTLIKE, OP_OR, OP_SUB, parameterName, PROJECTION, qs, st, te

Constructor Summary

SubqueryExpression(QueryExpression qs, QueryExpression expr)
Construct an expression containing this subquery.

Method Summary

void	all() Method to convert the subquery statement into ALL ({subquery})
void	any() Method to convert the subquery statement into ANY ({subquery})
BooleanExpression	containsMethod(ScalarExpression expr) Method to return an expression for whether the specified expression is contained in this subquery.
void	exists() Method to convert the subquery statement into EXISTS ({subquery})
QueryExpression	getSubquery() Convenience accessor for the subquery expression.
BooleanExpression	in(ScalarExpression expr) Method to convert the subquery statement into "expr IN ({subquery})"
BooleanExpression	isEmptyMethod() Method to return an expression for whether the subquery is empty (no results).
NumericExpression	sizeMethod() Method to return the size of the subquery.

Methods inherited from class org.datanucleus.store.mapped.expression.BooleanExpression

and, eor, eq, ior, neg, not, noteq

Methods inherited from class org.datanucleus.store.mapped.expression.ScalarExpression

accessField, add, as, assertValidTypeForParameterComparison, callMethod, cast, checkForTypeAssignability, com, div, encloseWithInParentheses, equals, getAlias, getConsistentTypeForParameterComparison, getExpressionList, getLogicSetExpression, getMapping, getNonAliasExpression, getQueryExpression, gt, gteq, instanceOf, lt, lteq, mod, mul, setParameterName, sub, toStatementText, toString

Methods inherited from class java.lang.Object

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

Constructor Detail

SubqueryExpression

public SubqueryExpression(QueryExpression qs,
                          QueryExpression expr)

Construct an expression containing this subquery.

Parameters:

qs - the QueryExpression

expr - Expression for the subquery

Method Detail

getSubquery

public QueryExpression getSubquery()

Convenience accessor for the subquery expression.

Returns:

Subquery expression

all

public void all()

Method to convert the subquery statement into ALL ({subquery})

any

public void any()

Method to convert the subquery statement into ANY ({subquery})

exists

public void exists()

Method to convert the subquery statement into EXISTS ({subquery})

in

public BooleanExpression in(ScalarExpression expr)

Method to convert the subquery statement into "expr IN ({subquery})"

Overrides:

in in class BooleanExpression

Parameters:

expr - The expression that is being contained

Returns:

BooleanExpression for the IN

containsMethod

public BooleanExpression containsMethod(ScalarExpression expr)

Method to return an expression for whether the specified expression is contained in this subquery. Uses IN operator.

Parameters:

expr - The expression that is being contained

Returns:

BooleanExpression for the contains(expr)

sizeMethod

public NumericExpression sizeMethod()

Method to return the size of the subquery.

Returns:

Size of the subquery

isEmptyMethod

public BooleanExpression isEmptyMethod()

Method to return an expression for whether the subquery is empty (no results).

Returns:

BooleanExpression for the isEmpty()