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* 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
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package org.apache.cayenne.access.dbsync;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.Collection;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import org.apache.cayenne.CayenneRuntimeException;
import org.apache.cayenne.access.DataNode;
import org.apache.cayenne.access.DbGenerator;
import org.apache.cayenne.map.DataMap;
import org.apache.cayenne.map.DbEntity;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
/**
* @since 3.0
*/
public class CreateIfNoSchemaStrategy extends BaseSchemaUpdateStrategy {
final static Log logger = LogFactory.getLog(CreateIfNoSchemaStrategy.class);
@Override
protected void processSchemaUpdate(DataNode dataNode) throws SQLException {
Map<String, Boolean> nameTables = getNameTablesInDB(dataNode);
Collection<DbEntity> entities = dataNode.getEntityResolver().getDbEntities();
boolean generate = true;
Iterator<DbEntity> it = entities.iterator();
while (it.hasNext()) {
if (nameTables.get(it.next().getName()) != null) {
generate = false;
break;
}
}
if (generate) {
logger.info("No schema detected, will create mapped tables");
generate(dataNode);
}
else {
logger.info("Full or partial schema detected, skipping tables creation");
}
}
private void generate(DataNode dataNode) {
Collection<DataMap> map = dataNode.getDataMaps();
Iterator<DataMap> iterator = map.iterator();
while (iterator.hasNext()) {
DbGenerator gen = new DbGenerator(dataNode.getAdapter(), iterator.next());
gen.setShouldCreateTables(true);
gen.setShouldDropTables(false);
gen.setShouldCreateFKConstraints(true);
gen.setShouldCreatePKSupport(true);
gen.setShouldDropPKSupport(false);
try {
gen.runGenerator(dataNode.getDataSource());
}
catch (Exception e) {
throw new CayenneRuntimeException(e);
}
}
}
/**
* Returns all the table names in database.
*
* @throws SQLException
*/
protected Map<String, Boolean> getNameTablesInDB(DataNode dataNode)
throws SQLException {
String tableLabel = dataNode.getAdapter().tableTypeForTable();
Connection con = null;
Map<String, Boolean> nameTables = new HashMap<String, Boolean>();
con = dataNode.getDataSource().getConnection();
try {
ResultSet rs = con.getMetaData().getTables(null, null, "%", new String[] {
tableLabel
});
try {
while (rs.next()) {
String name = rs.getString("TABLE_NAME");
nameTables.put(name, false);
}
}
finally {
rs.close();
}
}
finally {
con.close();
}
return nameTables;
}
}