/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* License: GNU Lesser General Public License (LGPL), version 2.1 or later.
* See the lgpl.txt file in the root directory or <http://www.gnu.org/licenses/lgpl-2.1.html>.
*/
package org.hibernate.dialect.function;
import java.sql.Types;
/**
* Some databases strictly return the type of the of the aggregation value for <tt>AVG</tt> which is
* problematic in the case of averaging integers because the decimals will be dropped. The usual workaround
* is to cast the integer argument as some form of double/decimal.
*
* @author Steve Ebersole
*/
public class AvgWithArgumentCastFunction extends StandardAnsiSqlAggregationFunctions.AvgFunction {
private final String castType;
/**
* Constructs a AvgWithArgumentCastFunction
*
* @param castType The type to cast the avg argument to
*/
public AvgWithArgumentCastFunction(String castType) {
this.castType = castType;
}
@Override
protected String renderArgument(String argument, int firstArgumentJdbcType) {
if ( firstArgumentJdbcType == Types.DOUBLE || firstArgumentJdbcType == Types.FLOAT ) {
return argument;
}
else {
return "cast(" + argument + " as " + castType + ")";
}
}
}