jdbc连接mysql

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  
            pst = conn.prepareStatement(sql);//准备执行语句  
        } catch (Exception e) {  
            e.printStackTrace();  
        }  
    }  
  
    public void close() {  
        try {  
            this.pst.close();  
            this.conn.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) {  
        test1();  
        test2();///执行带参数的sql语句
    }

    private static void test1() {
        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()) {  
                ///根据顺序取出结果集
                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();  
        }
    }  
    ///带参数的sql语句
    private static void test2() {
        ///带参数的SQL语句 ---------
        sql = "select *from stuinfo where chess_id = ? and name = ?"; 
        db1 = new DBHelper(sql);//创建DBHelper对象  
        
        try {  
            ///设置参数到sql语句中--------
            db1.pst.setString(1, "123");
            db1.pst.setString(2, "飞机");
            
            ret = db1.pst.executeQuery();//执行语句，得到结果集  
            while (ret.next()) {
                ///根据列名取出结果值---------
                String uid = ret.getString("chess_id");  
                String ufname = ret.getString("name");  
                String ulname = ret.getString("data");  
                String udate = ret.getString("data2");  
                System.out.println(uid + "	" + ufname + "	" + ulname + "	" + udate );  
            }//显示数据  
            ret.close(); ///关闭结果集的数据库的资源
            db1.close();//关闭连接  
        } catch (SQLException e) {  
            e.printStackTrace();  
        }  
    }
  
}