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+# 作业
+
+1.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  |
+
+2.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。
+3.交作业时，要把mysql相关代码和php一起提交
+
+```html
+create database student charset utf8;
+use student;
+create table USER(
+id int primary key auto_increment,
+name varchar(20) not null,
+score decimal(3,1) not null
+);
+
+insert into user values 
+(1,"陈小虫","98.5"),
+(2,"吴大虫","75.5"),
+(3,"陈得胜","66");
+
+```
+
+```php
+<?php
+
+/**
+ * Created by PhpStorm.
+ * User: Administrator
+ * Date: 2022/5/23
+ * Time: 10:56
+ */
+    $conn = mysqli_connect("localhost", "root", "root", "student")or die(连接失败);
+
+//    if ($conn){
+//        echo "连接成功";
+//    }else{
+//        echo "连接失败".mysqli_connect_error();
+//    }
+
+    mysqli_query($conn, "set names utf8");
+
+//增
+    $tj = "insert into `user` values(4,'小蓝','60')";
+    $res = mysqli_query($conn, $tj);
+    $resz = mysqli_query($conn,"insert into `user` values(5,'小红','77')");
+
+//删
+    $ress = mysqli_query($conn,"delete from user where name='陈得胜'");
+
+//改
+    $xg = "update user set name='小白' where name='小红' ";
+    $res = mysqli_query($conn,$xg);
+    $resxg = mysqli_query($conn,"update user set score='99.0' where score='77.0'");
+
+
+//查
+    $cx = "select * from user";
+    $rescx = mysqli_query($conn,$cx);
+
+    while ($cxjg = mysqli_fetch_assoc($rescx)) {
+        echo $cxjg['id'].$cxjg['name'].$cxjg['score'] ;
+    }
+    
+    mysqli_close($conn);
+```
+
+# 笔记
+
+### 连接
+
+```php
+mysqli_connect(host,username,password,dbname,port,socket );
+
+mysqli_connect(服务器地址,用户名,密码,数据库名,端口号,socket );
+
+mysqli_query($conn, "set names utf8");
+```
+
+### SQl语句：增，删，改，查等
+
+```php
+mysqli_query(connection,query,resultmode);
+
+处理结果集
+mysqli_fetch_all($result);// 将整个结果集以二维数组返回
+mysqli_fetch_array($result);// 将结果集里的一行返回成数组，有索引又有关联
+mysqli_fetch_assoc($result); //	从结果集中取得一行作为关联数组。
+mysqli_fetch_row ($result);// 从结果集中取得一行作为索引数组
+mysqli_fetch_object($ret)); // 从结果集中取得一行作为对象
+
+```
+
+### 关闭数据库连接
+
+```php
+mysqli_close(connection);关闭先前打开的数据库连接。
+```
+