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+# php操作mysql
+
+
+
+# 作业
+
+![img](https://tva1.sinaimg.cn/large/e6c9d24egy1h2ib4qh0bgj218g0p0mzw.jpg)
+
+```sql
+CREATE DATABASE student charset utf8;
+use student;
+create table user(
+id int PRIMARY KEY auto_increment,
+name VARCHAR(20) not null,
+score DECIMAL(8,2) not null
+)
+```
+
+```php
+<?php
+error_reporting(E_ALL^E_WARNING);
+$con=mysqli_connect("localhost","root","root","student") or die("连接失败".mysqli_connect_error($con));
+//增加数据
+$add ="insert into `user` (`name`,`score`)value
+    ('陈小龙',98.5),
+    ('吴大虫',75.5),
+    ('陈得胜',66)";
+$ret_add=mysqli_query($con,$add);
+if ($ret_add){
+    echo "添加成功";
+}else{
+    echo "添加失败";
+}
+echo "<br>";
+//删除数据
+$sql="delete from `user` where id>5";
+$sql_delete=mysqli_query($con,$sql);
+if ($sql_delete){
+    echo "删除成功";
+}else{
+    echo "删除失败";
+}
+echo "<br>";
+//更改数据
+$change="update `user` set name='甄是牛'where id=5";
+$sql_change=mysqli_query($con,$change);
+if ($sql_change){
+    echo "更改成功";
+}else{
+    echo "更改失败";
+}
+echo "<br>";
+//查询数据
+$select="select * from `user`";
+$sql_select=mysqli_query($con,$select);
+while ($aa=mysqli_fetch_assoc($sql_select)){
+    echo $aa['id'] .$aa['name'].$aa['score']."<br>";
+}
+```
+