Java是用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 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 + "\t" + ufname + "\t" + ulname + "\t" + udate ); }//显示数据 ret.close(); db1.close();//关闭连接 } catch (SQLException e) { e.printStackTrace(); } } }
测试数据库是在上一章 中建立的,所以直接查询
结果和用C#连接MySQL查询的结果一样