21.3.6.1. Connecting to MySQL Using the JDBC DriverManagerInterface

When you are using JDBC outside of an application server, the DriverManager class manages the establishment of Connections.

Specify to the DriverManager which JDBC drivers to try to make Connections with. The easiest way to do this is to use Class.forName() on the class that implements the java.sql.Driver interface. With MySQL Connector/J, the name of this class is com.mysql.jdbc.Driver. With this method, you could use an external configuration file to supply the driver class name and driver parameters to use when connecting to a database.

The following section of Java code shows how you might register MySQL Connector/J from the main() method of your application. If testing this code, first read the installation section at Section 21.3.3, "Connector/J Installation", to make sure you have connector installed correctly and the CLASSPATH set up. Also, ensure that MySQL is configured to accept external TCP/IP connections.

import java.sql.Connection;import java.sql.DriverManager;import java.sql.SQLException;// Notice, do not import com.mysql.jdbc.*// or you will have problems!public class LoadDriver {    public static void main(String[] args) {        try {            // The newInstance() call is a work around for some            // broken Java implementations            Class.forName("com.mysql.jdbc.Driver").newInstance();        } catch (Exception ex) {            // handle the error        }    }}

After the driver has been registered with the DriverManager, you can obtain a Connection instance that is connected to a particular database by calling DriverManager.getConnection():

import java.sql.Connection;import java.sql.DriverManager;import java.sql.SQLException;Connection conn = null;...try {    conn =       DriverManager.getConnection("jdbc:mysql://localhost/test?" +                                   "user=monty&password=greatsqldb");    // Do something with the Connection   ...} catch (SQLException ex) {    // handle any errors    System.out.println("SQLException: " + ex.getMessage());    System.out.println("SQLState: " + ex.getSQLState());    System.out.println("VendorError: " + ex.getErrorCode());}