JAVA使用JDBC连接MySQL数据库

首先要下载Connector/J地址：http://www.mysql.com/downloads/connector/j/

这是MySQL官方提供的连接方式：

解压后得到jar库文件，需要在工程中导入该库文件

我是用的是Eclipse：

 JAVA连接MySQL稍微繁琐，所以先写一个类用来打开或关闭数据库：

DBHelper.java

package com.hu.demo;  
  
import java.sql.Connection;  
import java.sql.DriverManager;  
import java.sql.PreparedStatement;  
import java.sql.SQLException;  
  
public class DBHelper {  
    public static final String url = "jdbc:mysql://127.0.0.1/student";  
    public static final String name = "com.mysql.jdbc.Driver";  
    public static final String user = "root";  
    public static final String password = "root";  
  
    public Connection conn = null;  
    public PreparedStatement pst = null;  
  
    public DBHelper(String sql) {  
        try {  
            Class.forName(name);//指定连接类型  
            conn = DriverManager.getConnection(url, user, password);//获取连接
            if(!conn.isCLosed()) System.out.println("数据库连接成功");
            pst = conn.prepareStatement(sql);//准备执行语句  
        } catch (Exception e) {  
            e.printStackTrace();  
        }  
    }  
  
    public void close() {  
        try {  
            this.conn.close();  
            this.pst.close();  
        } catch (SQLException e) {  
            e.printStackTrace();  
        }  
    }  
}  

再写一个Demo.java来执行相关查询操作

Demo.java

package com.hu.demo;  
  
import java.sql.ResultSet;  
import java.sql.SQLException;  
  
public class Demo {  
  
    static String sql = null;  
    static DBHelper db1 = null;  
    static ResultSet ret = null;  
  
    public static void main(String[] args) {  
        sql = "select *from stuinfo";//SQL语句  
        db1 = new DBHelper(sql);//创建DBHelper对象  
  
        try {  
            ret = db1.pst.executeQuery();//执行语句，得到结果集  
            while (ret.next()) {  
                String uid = ret.getString(1);  
                String ufname = ret.getString(2);  
                String ulname = ret.getString(3);  
                String udate = ret.getString(4);  
                System.out.println(uid + "	" + ufname + "	" + ulname + "	" + udate );  
            }//显示数据  
            ret.close();  
            db1.close();//关闭连接  
        } catch (SQLException e) {  
            e.printStackTrace();  
        }  
    }  
  
}  

直接查询：