/*****************************************************************
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.apache.cayenne.access.trans;
import java.io.IOException;
import java.sql.PreparedStatement;
import java.sql.SQLException;
import java.util.Iterator;
import java.util.List;
import org.apache.cayenne.dba.DbAdapter;
import org.apache.cayenne.dba.QuotingStrategy;
import org.apache.cayenne.map.DbAttribute;
import org.apache.cayenne.query.BatchQuery;
import org.apache.cayenne.query.UpdateBatchQuery;
/**
* A translator for UpdateBatchQueries that produces parameterized SQL.
*/
public class UpdateBatchQueryBuilder extends BatchQueryBuilder {
public UpdateBatchQueryBuilder(DbAdapter adapter) {
super(adapter);
}
@Override
public String createSqlString(BatchQuery batch) throws IOException {
UpdateBatchQuery updateBatch = (UpdateBatchQuery) batch;
QuotingStrategy strategy = getAdapter().getQuotingStrategy();
List<DbAttribute> qualifierAttributes = updateBatch.getQualifierAttributes();
List<DbAttribute> updatedDbAttributes = updateBatch.getUpdatedAttributes();
StringBuffer query = new StringBuffer("UPDATE ");
query.append(strategy.quotedFullyQualifiedName(batch.getDbEntity()));
query.append(" SET ");
int len = updatedDbAttributes.size();
for (int i = 0; i < len; i++) {
if (i > 0) {
query.append(", ");
}
DbAttribute attribute = updatedDbAttributes.get(i);
query.append(strategy.quotedName(attribute));
query.append(" = ?");
}
query.append(" WHERE ");
Iterator<DbAttribute> i = qualifierAttributes.iterator();
while (i.hasNext()) {
DbAttribute attribute = i.next();
appendDbAttribute(query, attribute);
query.append(updateBatch.isNull(attribute) ? " IS NULL" : " = ?");
if (i.hasNext()) {
query.append(" AND ");
}
}
return query.toString();
}
/**
* Binds BatchQuery parameters to the PreparedStatement.
*/
@Override
public void bindParameters(PreparedStatement statement, BatchQuery query) throws SQLException, Exception {
UpdateBatchQuery updateBatch = (UpdateBatchQuery) query;
List<DbAttribute> qualifierAttributes = updateBatch.getQualifierAttributes();
List<DbAttribute> updatedDbAttributes = updateBatch.getUpdatedAttributes();
int len = updatedDbAttributes.size();
int parameterIndex = 1;
for (int i = 0; i < len; i++) {
Object value = query.getValue(i);
DbAttribute attribute = updatedDbAttributes.get(i);
adapter.bindParameter(statement, value, parameterIndex++, attribute.getType(), attribute.getScale());
}
for (int i = 0; i < qualifierAttributes.size(); i++) {
Object value = query.getValue(len + i);
DbAttribute attribute = qualifierAttributes.get(i);
// skip null attributes... they are translated as "IS NULL"
if (updateBatch.isNull(attribute)) {
continue;
}
adapter.bindParameter(statement, value, parameterIndex++, attribute.getType(), attribute.getScale());
}
}
}