| /* |
| * 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.wayang.jdbc.execution; |
| |
| import java.sql.Connection; |
| import java.sql.DriverManager; |
| import org.apache.wayang.core.api.exception.WayangException; |
| |
| /** |
| * This class describes a database. |
| */ |
| public class DatabaseDescriptor { |
| |
| private final String jdbcUrl, user, password, jdbcDriverClassName; |
| |
| /** |
| * Creates a new instance. |
| * |
| * @param jdbcUrl JDBC URL to the database |
| * @param user <i>optional</i> user name or {@code null} |
| * @param password <i>optional</i> password or {@code null} |
| * @param jdbcDriverClassName name of the JDBC driver {@link Class} to access the database; |
| * required for {@link #createJdbcConnection()} |
| */ |
| public DatabaseDescriptor(String jdbcUrl, String user, String password, String jdbcDriverClassName) { |
| this.jdbcUrl = jdbcUrl; |
| this.user = user; |
| this.password = password; |
| this.jdbcDriverClassName = jdbcDriverClassName; |
| } |
| |
| /** |
| * Creates a {@link Connection} to the database described by this instance. |
| * |
| * @return the {@link Connection} |
| */ |
| public Connection createJdbcConnection() { |
| try { |
| Class.forName(this.jdbcDriverClassName); |
| } catch (Exception e) { |
| throw new WayangException(String.format("Could not load JDBC driver (%s).", this.jdbcDriverClassName), e); |
| } |
| |
| try { |
| return DriverManager.getConnection(this.jdbcUrl, this.user, this.password); |
| } catch (Throwable e) { |
| throw new WayangException(String.format( |
| "Could not connect to database (%s) as %s with driver %s.", this.jdbcUrl, this.user, this.jdbcDriverClassName |
| ), e); |
| } |
| } |
| } |