mysql数据库jdbc连接通用类

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首先，下载配置好myeclipse

下载好mysql-jdbc.jar包

创建一个java项目，导入mysql-jdbc.jar包

创建一个数据库，可以用可视化数据库工具SQLyog

创建一个java

新建一个包名为com.imooc

Db.java文件

package com.company;/** * Created by Administrator on 2017/4/19. */        import java.sql.Connection;        import java.sql.DriverManager;        import java.sql.PreparedStatement;        import java.sql.ResultSet;        import java.sql.SQLException;public class DB {    public static final String url = "jdbc:mysql://127.0.0.1/log";    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 ResultSet exec(String sql) {        ResultSet rs = null;        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            rs = pst.executeQuery();        } catch (Exception e) {            e.printStackTrace();        }        return rs;    }    public void close() {        try {            this.conn.close();            this.pst.close();        } catch (SQLException e) {            e.printStackTrace();        }    }}

Test.java文件

package com.imooc;import java.sql.ResultSet;import java.sql.SQLException;public class Test {/** * @param args */public static void main(String[] args) {// TODO Auto-generated method stubDb db = new Db();ResultSet rs = db.exec("select * from login");try {while(rs.next()){                String ufname = rs.getString(1);                                 System.out.println(ufname);  }} catch (SQLException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}

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