import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

public class MySQL {

    private static final String name = "com.mysql.jdbc.Driver";
    private static final String url = "jdbc:mysql://127.0.0.1:3306/";
    //数据库名称
    private static final String database = "book";
    //用户名及密码
    private static final String user = "root";
    private static final String password = "";

    protected Connection connect = null;
    protected Statement statement = null;

    {
        try {

            // 加载MySQL驱动
            Class.forName(name);
            // 通过DriverManger获取数据库连接
            connect = DriverManager.getConnection(url + database, user, password);
            // 通过Connection对象创建Statement对象
            statement = connect.createStatement();

        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }

    // 执行SQL查询语句
    public ResultSet sqlQuery(String select) {
        ResultSet res = null;
        try {
            res = statement.executeQuery(select);

        } catch (SQLException e) {
            e.printStackTrace();
        }
        return res;
    }

    // 执行SQL更新语句
    public void sqlUpdate(String update) {
        try {
            statement.executeUpdate(update);
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }

    // 关闭连接
    public void sqlClose() {
        try {
            statement.close();
            connect.close();
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
}

MySQL驱动下载地址：http://dev.mysql.com/downloads/connector/j/