3-2 自由编程 作业
来源:3-2 自由编程
csm032
2020-04-22 16:43:28
JAVA部分—— package com.imooc.jdbc.demo1; import java.sql.Connection; import java.sql.DriverManager; import java.sql.ResultSet; import java.sql.SQLException; import java.sql.Statement; import org.junit.Test; public class Lianxi_3_2 { @Test public void demo(){ Connection conn=null; Statement stmt=null; ResultSet rs=null; try { Class.forName("com.mysql.cj.jdbc.Driver"); conn=DriverManager.getConnection("jdbc:mysql://localhost:3306/jdbctest1?serverTimezone=Hongkong", "root", "123456"); String sql1="insert goods values(null,'耳机',200.0,'蓝牙耳机')"; stmt=conn.createStatement(); int i=stmt.executeUpdate(sql1); if(i>0) { System.out.println("添加数据成功!"); } String sql2="select * from goods"; rs=stmt.executeQuery(sql2); while(rs.next()) { int id=rs.getInt("id"); String name=rs.getString("name"); String price=rs.getString("price"); String desp=rs.getString("desp"); System.out.println(id+" "+name+" "+price+" "+desp); } } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); }finally { if(rs!=null) { try { rs.close(); } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } rs=null; } if(stmt!=null) { try { stmt.close(); } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } stmt=null; } if(conn!=null) { try { conn.close(); } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } conn=null; } } } }
MySQL部分——
create database jdbctest1;
use jdbctest1;
create table goods(
id int unsigned key auto_increment,
name varchar(20) not null,
price float not null,
desp varchar(30) not null
);
insert goods(name,price,desp) values('手机',2000.0,'黑色,存储容量32G'),
('冰箱',1500.0,'银色,对开门'),
('洗衣机',3000.0,'滚筒'),
('空调',4000,'变频空调');
select * from goods;
1回答
同学你好!程序运行效果正确,完成得很好!继续加油。
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