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+# 解答
+
+```mysql
+mysql
+
+CREATE DATABASE student charset utf8;
+use student;
+CREATE table user(
+ id  int PRIMARY key auto_increment,
+name varchar(20) not null,
+score decimal(5,2) not null
+);
+```
+
+```php
+php
+
+<?php
+error_reporting(E_ALL^E_WARNING);
+// 连接数据库
+$a= mysqli_connect('127.0.0.1', 'root','root','student') or die("连接失败：".mysqli_connect_error());
+mysqli_query($a,"set names utf8");// 修改乱码
+$sql="insert into `user` (`name`,`score`) values ('陈小龙','98.5'),('吴大虫','75.5'),('陈得胜','66')"; // 增加数据
+$sp="delete from `user` where `id`<2";// 删除数据
+$re=mysqli_query($a,$sql);
+$re=mysqli_query($a,$sp);
+$hu="update `user` set `name`='艾大娘' where `id` =3";// 修改数据
+$re=mysqli_query($a,$hu);
+$b="select * from`user`";// 查询
+$res=mysqli_query($a,$b);
+while($c=mysqli_fetch_assoc($res)){
+    echo $c['id']."  ".$c['name']."  ".$c['score']."<br>";
+}
+mysqli_close($a);// 关闭数据库连接
+```
+
+### 笔记
+
+1 mysqli_connect(服务器地址,用户名,密码,数据库名,端口号,socket );连接数据库
+
+2 在PHP中实现MySQL的增删改查
+
+``` php
+$a="insert" into `表名` values（‘增加的内容’）;
+$sp="delete from  `表名`  where “删除内容的位置”;
+$hu="update `表名·` set ‘要修改的内容’ where “修改内容的位置”;
+$b="select * from`user`";// 查询
+$res=mysqli_query($a,$b);
+while($c=mysqli_fetch_assoc($res)){// 查询语段
+    echo $c['id']."  ".$c['name']."  ".$c['score']."<br>";
+}
+```
+
+3、mysqli_close(connection);关闭先前打开的数据库连接。