org.datanucleus.store.rdbms.sql.method

Class AvgWithCastFunction

java.lang.Object

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

org.datanucleus.store.rdbms.sql.method.SimpleNumericAggregateMethod

org.datanucleus.store.rdbms.sql.method.AvgFunction

org.datanucleus.store.rdbms.sql.method.AvgWithCastFunction

All Implemented Interfaces:

SQLMethod

public class AvgWithCastFunction
extends AvgFunction

Some databases will use the same type for the return value as the argument, which can be an issue when averaging on integral types since it will drop the decimals. This class will convert the arg to a "CAST({arg} AS double)"

Field Summary

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

clr, exprFactory, stmt

Constructor Summary

Constructors

Constructor and Description
AvgWithCastFunction()

Method Summary

Modifier and Type	Method and Description
protected SQLExpression	getAggregateExpression(List args, JavaTypeMapping m)

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

getClassForMapping, getExpression, getFunctionName

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

AvgWithCastFunction

public AvgWithCastFunction()

Method Detail

getAggregateExpression

protected SQLExpression getAggregateExpression(List args,
                                               JavaTypeMapping m)

Overrides:

getAggregateExpression in class AvgFunction