com.orientechnologies.orient.core.sql.functions.conversion.OSQLMethodBeforeUpdate Maven / Gradle / Ivy
/*
* Copyright 2010-2016 OrientDB LTD (http://orientdb.com)
* Copyright 2013 Geomatys.
*
* 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 com.orientechnologies.orient.core.sql.functions.conversion;
import com.orientechnologies.orient.core.command.OCommandContext;
import com.orientechnologies.orient.core.db.record.OIdentifiable;
import com.orientechnologies.orient.core.sql.executor.LiveQueryListenerImpl;
import com.orientechnologies.orient.core.sql.executor.OResult;
import com.orientechnologies.orient.core.sql.method.misc.OAbstractSQLMethod;
/**
* ONLY FOR LIVE QUERY. Returns the value of current record (as an OResult) before it was updated.
* Null if the record is new
* eg. on update, get only records whose "name" attribute was update
* db.live("select from Person where @this.beforeUpdate().name != name
*
*
* @author Luigi Dell'Aquila (l.dellaquila--(at)--orientdb.com)
*/
public class OSQLMethodBeforeUpdate extends OAbstractSQLMethod {
public static final String NAME = "beforeUpdate";
public OSQLMethodBeforeUpdate() {
super(NAME, 0, 0);
}
@Override
public String getSyntax() {
return "beforeUpdate()";
}
@Override
public Object execute(
Object iThis,
OIdentifiable iCurrentRecord,
OCommandContext iContext,
Object ioResult,
Object[] iParams) {
if (iThis instanceof OResult) {
return ((OResult) iThis).getMetadata(LiveQueryListenerImpl.BEFORE_METADATA_KEY);
}
return null;
}
}