Java JDBC Connection Create getConnection(String jdbcDriverName, String connectionURL)

Description

Look up an open connection.

License

Apache License

Declaration

protected static Connection getConnection(String jdbcDriverName, String connectionURL) throws SQLException 

Method Source Code

//package com.java2s;
/*/* w w  w . j  a  va2 s  .  c  om*/
    
Derby - Class org.apache.derbyDemo.vtis.core.QueryVTIHelper
    
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.
    
*/

import java.sql.*;
import java.util.*;

public class Main {
    private static Hashtable<String, Connection> _openConnections = new Hashtable<String, Connection>();

    /**
     * <p>
     * Look up an open connection. If it doesn't exist, create a Connection.
     * </p>
     *
     */
    protected static Connection getConnection(String jdbcDriverName, String connectionURL) throws SQLException {
        Connection conn = _openConnections.get(connectionURL);

        if (conn == null) {
            // as necessary, fault in the jdbc driver which accesses the external dbms

            try {
                Class.forName(jdbcDriverName);
            } catch (ClassNotFoundException e) {
                throw new SQLException("Could not find " + jdbcDriverName + " on the classpath.");
            }

            try {
                conn = DriverManager.getConnection(connectionURL);
                _openConnections.put(connectionURL, conn);
            } catch (SQLException s) {
                SQLException t = new SQLException("Could not open a connection to " + connectionURL
                        + ". Perhaps the foreign database is not up and running? Details: " + s.getMessage());

                t.setNextException(s);

                throw t;
            }
        }

        return conn;
    }
}

Related

1. getConnection(String driver, String url, String username, String password)
2. getConnection(String driverClass, String url, String user, String password)
3. getConnection(String driverName, String urlprefix, String host, String port, String database, String user, String password)
4. getConnection(String drvr, String url, String nm, String pass)
5. getConnection(String filename)
6. getConnection(String propertiesFilePath)
7. getConnection(String subprotocol, String subname, String user, String password)
8. getConnection(String url, String username, String password)
9. getConnection(String url, String userName, String password)