JAVA使用JDBC连接MySQl

首先创建数据库帮助类DBHelper.java

import java.sql.DriverManager;

import java.sql.Connection;  
import java.sql.PreparedStatement;  
import java.sql.SQLException;  


public class DBHelper {
    public static final String url = "jdbc:mysql://127.0.0.1/stuinfo";
    public static final String name = "com.mysql.jdbc.Driver";
    public static final String user = "root";
    public static final String password = "1234";

    public Connection conn = null;
    public PreparedStatement pst = null;

    public DBHelper(String sql){
        try{
            Class.forName(name);
            conn = DriverManager.getConnection(url, user, password);
            pst = conn.prepareStatement(sql);
        }catch(Exception e){
            e.printStackTrace();
        }
    }
    public void close(){
        try{
            this.conn.close();
            this.pst.close();
        }catch(SQLException e){
            e.printStackTrace();
        }
    }
}

接下来是使用的例子 Demo.java

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 stu";
        db1 = new DBHelper(sql);

        try{
            ret = db1.pst.executeQuery();
            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 + "\t" + ufname + "\t" + ulname +"\t"+udate);

            }
            ret.close();
            db1.close();
        }catch(SQLException e){
            e.printStackTrace();
        }
    }
}

运行结果

MySql需要特定的驱动
把那个jar添加到Reference Libraries里即可