JDBC连接数据库代码 （一） -- 一个简单的获取数据库表单

一个简单的获取数据库表单代码

连接步骤：

1.加载数据库驱动（jar包） 2.获得数据库连接 3.创建SQL语句 4.执行查询 5.遍历结果集 5.关闭数据库连接

具体实例： package com.nenu.www; import java.sql.Connection; import java.sql.DriverManager; import java.sql.ResultSet; import java.sql.SQLException; import java.sql.Statement; public class JdbcConn { public static void main(String[] args) { try { Class.forName("com.mysql.jdbc.Driver");//导入驱动（jar包） } catch (ClassNotFoundException e) { e.printStackTrace(); } Connection conn = null; try { conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/test", "root", "root");//建立连接 } catch (SQLException e) { e.printStackTrace(); } String sql = "select name,email,dob from student";//建立SQL语句 try { Statement stmt = conn.createStatement(); ResultSet rs = stmt.executeQuery(sql); //cursor while(rs.next()){ String name = rs.getString(1); String email = rs.getString(2); String dob = rs.getString(3); System.out.println(name+" , "+email+" , "+dob); } } catch (SQLException e) { e.printStackTrace(); }finally{ if(conn!=null) try { conn.close();//关闭连接 } catch (SQLException e) { e.printStackTrace(); } } } } （同样打开MySQL命令行也可打开相应数据库内容）如下： Enter password: **** Welcome to the MySQL monitor. Commands end with ; or \g. Your MySQL connection id is 9 Server version: 5.6.21-log MySQL Community Server (GPL) Copyright (c) 2000, 2014, Oracle and/or its affiliates. All rights reserved. Oracle is a registered trademark of Oracle Corporation and/or its affiliates. Other names may be trademarks of their respective owners. Type 'help;' or '\h' for help. Type '\c' to clear the current input statement. mysql> use localhost database Database changed mysql> select * from test -> ; ERROR 1146 (42S02): Table 'localhost.test' doesn't exist mysql> use test database Database changed mysql> select * from student; +---------+--------+-----------+------------+ | stud_id | name | email | dob | +---------+--------+-----------+------------+ | 1 | 哈哈 | 198493290 | 2017-12-13 | | 2 | 李zz | 343908409 | 2017-12-13 | | 3 | zzzz | 398479284 | 2017-12-13 | +---------+--------+-----------+------------+ 3 rows in set (0.00 sec) mysql>