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@@ -0,0 +1,78 @@
+Mysql中新建个student数据库，里面有个学生信息表user，表结构和内容如下
+
+完成PHP访问数据库五步。使用mysqli扩展对mysql数据库中的学生信息表进行增删改查。
+交作业时，要把mysql相关代码和php一起提交
+
+``` mysql
+create database student charset utf8;
+use student;
+create table user(
+	id int primary key auto_increment,
+	name varchar(10) not null,
+	score decimal not null
+);
+```
+
+``` php
+<?php
+/**
+ * Created by PhpStorm.
+ * User: 奈优
+ * Date: 2022/5/23
+ * Time: 18:13
+ */
+
+// 删除系统提示
+error_reporting(E_ALL^E_WARNING);
+// 建立连接
+$lj = mysqli_connect('127.0.0.1','root','root','student') or die("错误: ".mysqli_connect_error($lj));
+//var_dump($lj);
+// 字符集
+$zf = mysqli_query($lj,'set names utf8');
+//$zf = mysqli_set_charset('utf8');
+var_dump($zf);
+// 增加数据
+$zj = "insert into `user`  values (null,'陈小龙',98.5),(null,'吴大虫',75.5),(null,'陈得胜',66)";
+// 执行操作
+$zx = mysqli_query($lj,$zj);
+if ($zx){
+    echo "添加成功";
+}else{
+    echo "添加失败";
+}
+// 删除数据
+$sc = "delete from `user`";
+$sc = "truncate `user`";
+// 执行操作
+$zx2 = mysqli_query($lj,$sc);
+if ($zx2){
+    echo "删除成功";
+}else{
+    echo "删除失败";
+}
+// 修改数据
+$xg = "update `user` set name = '吴小虫' where id = 2";
+// 执行操作
+$zx3 = mysqli_query($lj,$xg);
+if ($zx3){
+    echo "修改成功";
+}else{
+    echo "修改失败";
+}
+// 查询数据
+$cx = "select * from `user`";
+// 执行操作
+$zx4 = mysqli_query($lj,$cx);
+//or die("查无此类".mysqli_connect_error($lj))
+if ($zx4){
+    echo "查询为"."<br>";
+}else{
+    die("查无此类");
+}
+
+while ($sc = mysqli_fetch_assoc($zx4)){
+    echo $sc['id'].$sc['name'].$sc[score]."<br>";
+}
+
+```
+