Class CoalesceFunction

java.lang.Object

org.datanucleus.store.rdbms.sql.method.CoalesceFunction

All Implemented Interfaces:

SQLMethod

public class CoalesceFunction
extends Object
implements SQLMethod

Expression handler to invoke the SQL COALESCE function. For use in evaluating COALESCE({expr [,expr2[,expr3]]}) where the RDBMS supports this function. All args must be of consistent expression types. Returns an SQLExpression "COALESCE({expr})".

Constructor Summary

Constructors

Constructor	Description
CoalesceFunction()

Method Summary

Modifier and Type	Method	Description
SQLExpression	getExpression(SQLStatement stmt, SQLExpression expr, List<SQLExpression> args)	Return the expression for this SQL function.

Methods inherited from class Object

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

Constructor Details

CoalesceFunction

public CoalesceFunction()

Method Details

getExpression

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

Description copied from interface: SQLMethod

Return the expression for this SQL function.

Specified by:

getExpression in interface SQLMethod

Parameters:

stmt - SQLStatement that this expression is for

expr - The expression that it is invoked on

args - Arguments passed in

Returns:

The SQL expression using the SQL function