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+# 笔记
+
+# 链接服务器
+
+1.连接Mysql服务器同时选择数据库
+
+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 );
+
+2.先连接Mysql服务器
+
+mysqli_connect(host,username,password);
+
+再选择数据库
+
+mysqli_select_db($link,db_name);// 返回布尔值
+
+# SQI语句：增，删，改，查
+
+mysqli_query(connection,query,resultmode);
+
+# 查询
+
+mysqli_fetch_all($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
+
+mysqli_affected_rows($conn);// 返回最近一次query操作受影响的行数
+
+返回前一次 MySQL 操作（SELECT、INSERT、UPDATE、REPLACE、DELETE）所影响的记录行数
+
+# 关闭数据库
+
+mysqli_close(connection);关闭先前打开的数据库连接
+
+# 作业
+
+```mysql
+CREATE DATABASE student CHARSET utf8;
+use student;
+create table USER(
+id int PRIMARY key auto_increment,
+name VARCHAR(20) not NULL,
+score DECIMAL(5,2)not null
+);
+
+```
+
+```php+HTML
+<?php
+/**
+ * Created by PhpStorm.
+ * User: Administrator
+ * Date: 2022/5/23
+ * Time: 11:14
+ */
+error_reporting(E_ALL ^ E_WARNING);
+$ar=mysqli_connect('127.0.0.1','root','123456');//链接数据库
+if(!$ar){
+    die('出错：'.mysqli_connect_error());
+}
+$br=mysqli_select_db($ar,'student');// 选择数据库
+if(!$br){
+    die('数据库选没了：'.mysqli_error($ar));
+}
+mysqli_query($conn, 'set names utf8');//乱码
+$sql="insert into `user` (`name`,`score`) values ('陈小龙','98.5'),('吴大虫','75.5'),('陈得胜','66')"; 
+mysqli_query($ar,$sql);
+//增
+$zeng = "insert into `user` (`name`,`score`) values ('刘鸿',60)";
+mysqli_query($ar,$zeng);
+// 删
+$sc="delete from `user` where `id`=3";
+mysqli_query($arr,$sc);
+//改
+$gai = "update `user`  set `name` = '刘奇' where `id` = 2 ";
+mysqli_query($ar,$gai);
+//查
+$c= "select * from `user`";
+$d=mysqli_query($ar,$c);
+while ($a = mysqli_fetch_assoc($d)) {
+    echo $a['id'] . "  " . $a['name'] . "  " . $a['score'] . "<br>";
+}
+
+
+```
+
+
+