怎样在Eclipse开发环境中连接MySQL数据库

怎样在eclipse开发环境中连接数据库。

1）eclipse开发环境里没有集成mysql的驱动，需要从以下地址下载连接驱动程序mysql-connector-java-XX-XX-XX.zip：

http://dev.mysql.com/downloads/connector/j

2）解压，只取文件mysql-connector-java-XX.XX.XX-bin.jar，将其引用到你需要连接mysql数据库的工程里，如：我在eclipsel里建了一个测试数据库连接的工程ConMysql。具体操作如下：

   在工程ConMysql上点击右键

   properties->Java Build Path->Libraries

   点击Add External JARS...

   选取解压后的mysql-connector-java-XX.XX.XX-bin.jar

3.编写测试代码1

import java.sql.*; public class MysqlJdbc {   public static void main(String args[]) {      try {       Class.forName("com.mysql.jdbc.Driver");     //加载MYSQL JDBC驱动程序        //Class.forName("org.gjt.mm.mysql.Driver");       System.out.println("Success loading Mysql Driver!");      }     catch (Exception e) {       System.out.print("Error loading Mysql Driver!");       e.printStackTrace();     }     try {       Connection connect = DriverManager.getConnection(        "jdbc:mysql://localhost:3306/mysql","root",""); //连接URL为   jdbc:mysql//服务器地址/数据库名 //后面的2个参数分别是登陆用户名和密码       System.out.println("Success connect Mysql server!");       Statement stmt = connect.createStatement();       ResultSet rs = stmt.executeQuery("select * from help_topic");       while (rs.next()) {         System.out.println(rs.getString("name"));       }     }     catch (Exception e) {       System.out.print("get data error!");     e.printStackTrace();     }   } }

   4.编写测试代码2

import java.awt.GridLayout; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.sql.Connection; import java.sql.DriverManager; import java.sql.ResultSet; import java.sql.Statement; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JPasswordField; import javax.swing.JTextField;

public class LoginFrame extends JFrame  implements ActionListener{  JLabel label = new JLabel("请输入用户名和密码：");  JTextField tfName = new JTextField("");  //输入用户名的文本框  JPasswordField tfPassword = new JPasswordField(""); //输入密码的密码框  JButton button = new JButton("登录");  public LoginFrame()  {   this.setTitle("登录验证");   button.addActionListener(this);         this.getContentPane().setLayout(new GridLayout(4,1));         this.getContentPane().add(label);         this.getContentPane().add(tfName);         this.getContentPane().add(tfPassword);         this.getContentPane().add(button);   this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);         this.setSize(300,200);         this.setLocation(200,300);         this.setVisible(true);  }    public void actionPerformed(ActionEvent e)    {   try{    /*     * 连接MySQL数据库     */    Class.forName("com.mysql.jdbc.Driver");    Connection conn=DriverManager.getConnection("jdbc:mysql://localhost/mysql","root","");          Statement stmt=conn.createStatement();    String sql = "select * from account where username='" + tfName.getText() + "'";       sql += " and password='" + tfPassword + "'";  //准备查询语句       ResultSet rs=stmt.executeQuery( sql );       if( rs.next() )      label.setText("合法用户");  //身份验证通过???          else     label.setText("非法用户");  //身份验证没有通过?????   }catch(Exception ee){       ee.printStackTrace();   }   }  public static void main(String[] args) {   new LoginFrame();  } }