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+// 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
+
+| 字段  | 类型    | 备注       |
+| ----- | ------- | ---------- |
+| id    | int     | 自增，主键 |
+| name  | varchar | 非空       |
+| score | decimal | 非空       |
+
+| 1    | 陈小龙 | 98.5 |
+| ---- | ------ | ---- |
+| 2    | 吴大虫 | 75.5 |
+| 3    | 陈得胜 | 66   |
+
+``` php
+create database student charset utf8;
+use student;
+
+
+
+create table user(
+id int auto_increment primary key,
+name varchar(30) not null,
+score decimal(3,2) not null
+);
+```
+
+// 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。
+
+
+``` php
+<?php
+
+
+error_reporting(E_ALL ^ E_WARNING);
+$db = mysqli_connect("127.0.0.1", "root", "root", "student");
+
+if (!$db) {
+    echo "连接失败喔" . mysqli_connect_error();
+    die();
+}
+
+// set names utf8;
+mysqli_query($db, 'set names utf8');
+$ins = "insert into `user`(`name`,`score`) values ('陈小龙',98.5),('吴大虫',75.5),('陈得胜',66)";
+$re = mysqli_query($db, $ins);
+
+if (!$re) {
+
+    die("插入失败喔" . mysqli_error($db));
+}
+
+
+$dele = "delete from `user` where `id`=3";
+$re_dele = mysqli_query($db, $dele);
+
+if (!$re_dele) {
+    die("删除失败喔" . mysqli_error($db));
+}
+
+$up = "update `user` set `name`='小明' where  `id`=1";
+$re_up = mysqli_query($db, $up);
+
+if (!$re_up) {
+    die("更新失败啦" . mysqli_error($db));
+}
+
+
+
+$select = "select * from `user`";
+$re_select = mysqli_query($db, $select);
+if (!$re_select) {
+    die("出错啦" . mysqli_error($db));
+}
+mysqli_query($db,"set names utf8");
+
+while ($arr = mysqli_fetch_assoc($re_select)) {
+    echo $arr['id'].$arr['name'].$arr['score']."<br>";
+
+}
+
+
+mysqli_close($db);
+```
+