Java tutorial
/***************************************************************** * 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.dbsync.reverse.dbload; import java.sql.DatabaseMetaData; import java.sql.ResultSet; import java.sql.SQLException; import org.apache.cayenne.map.DbEntity; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; class ExportedKeyLoader extends PerEntityLoader { private static final Log LOGGER = LogFactory.getLog(ExportedKeyLoader.class); ExportedKeyLoader(DbLoaderConfiguration config, DbLoaderDelegate delegate) { super(null, config, delegate); } @Override boolean shouldLoad(DbEntity entity) { return delegate.dbRelationship(entity); } @Override boolean catchException(DbEntity entity, SQLException ex) { LOGGER.info("Error getting relationships for '" + entity.getCatalog() + "." + entity.getSchema() + "', ignoring. " + ex.getMessage(), ex); return true; } @Override ResultSet getResultSet(DbEntity dbEntity, DatabaseMetaData metaData) throws SQLException { return metaData.getExportedKeys(dbEntity.getCatalog(), dbEntity.getSchema(), dbEntity.getName()); } @Override void processResultSet(DbEntity dbEntity, DbLoadDataStore map, ResultSet rs) throws SQLException { ExportedKey key = new ExportedKey(rs); DbEntity pkEntity = map.getDbEntity(key.getPk().getTable()); if (pkEntity == null) { LOGGER.info("Skip relation: '" + key + "' because table '" + key.getPk().getTable() + "' not found"); return; } DbEntity fkEntity = map.getDbEntity(key.getFk().getTable()); if (fkEntity == null) { LOGGER.info("Skip relation: '" + key + "' because table '" + key.getFk().getTable() + "' not found"); return; } map.addExportedKey(key); } }