org.datanucleus.store.rdbms.sql.method

Class MapValueMethod

java.lang.Object

org.datanucleus.store.rdbms.sql.method.AbstractSQLMethod

org.datanucleus.store.rdbms.sql.method.MapValueMethod

All Implemented Interfaces:

SQLMethod

public class MapValueMethod
extends AbstractSQLMethod

Method for evaluating VALUE({mapExpr}). Returns an ObjectExpression representing the value mapping.

Field Summary

Fields inherited from class org.datanucleus.store.rdbms.sql.method.AbstractSQLMethod

clr, exprFactory, stmt

Constructor Summary

Constructors

Constructor and Description
MapValueMethod()

Method Summary

Modifier and Type	Method and Description
protected SQLExpression	getAsJoin(MapExpression mapExpr) Implementation of VALUE(map) using a join to the table representing the map, and returning the value.
protected SQLExpression	getAsSubquery(MapExpression mapExpr) Implementation of VALUE(map) using a subquery on the table representing the map, returning the value.
SQLExpression	getExpression(SQLExpression expr, List<SQLExpression> args) Return the expression for this SQL function.

Methods inherited from class org.datanucleus.store.rdbms.sql.method.AbstractSQLMethod

getMappingForClass, setStatement

Methods inherited from class java.lang.Object

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

Constructor Detail

MapValueMethod

public MapValueMethod()

Method Detail

getExpression

public SQLExpression getExpression(SQLExpression expr,
                                   List<SQLExpression> args)

Description copied from interface: SQLMethod

Return the expression for this SQL function.

Parameters:

expr - The expression that it is invoked on

args - Arguments passed in

Returns:

The SQL expression using the SQL function

getAsJoin

protected SQLExpression getAsJoin(MapExpression mapExpr)

Implementation of VALUE(map) using a join to the table representing the map, and returning the value.

Parameters:

mapExpr - The map expression

Returns:

The value expression

getAsSubquery

protected SQLExpression getAsSubquery(MapExpression mapExpr)

Implementation of VALUE(map) using a subquery on the table representing the map, returning the value.

Parameters:

mapExpr - The map expression

Returns:

The value expression