BetterSQLServer2012Dialect.java

/*
 * Copyright 2021 Global Crop Diversity Trust
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.gringlobal.custom.hibernate;

import org.hibernate.dialect.SQLServer2012Dialect;
import org.hibernate.dialect.function.SQLFunctionTemplate;
import org.hibernate.dialect.function.StandardSQLFunction;
import org.hibernate.type.DoubleType;
import org.hibernate.type.StandardBasicTypes;

/**
 * The Class BetterSQLServer2012Dialect.
 */
public class BetterSQLServer2012Dialect extends SQLServer2012Dialect {

	/**
	 * Adds missing functions to SQLServer dialect
	 */
	public BetterSQLServer2012Dialect() {
		super();
		registerFunction("stddev", new StandardSQLFunction("stdev", DoubleType.INSTANCE));
		registerKeyword("day"); // Needed for DATEDIFF(DAY, ...) as an unquoted keyword
		registerFunction("datediff", new SQLFunctionTemplate(StandardBasicTypes.INTEGER, "datediff(day, ?1, ?2)"));

		// Needed for OFFSET 0 ROWS FETCH FIRST 1 ROWS ONLY
		registerKeyword("OFFSET");
		registerKeyword("FETCH");
		registerKeyword("FIRST");
		registerKeyword("ROWS");
		registerKeyword("ONLY");
	}

}