From 14df840e9d398ac16d53bb2cdd1bcb2eb4351813 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E4=B8=81=E4=BD=B3=E4=BC=B6?= <2621740991@qq.com>
Date: Tue, 24 May 2022 12:43:55 +0800
Subject: [PATCH] test

---
 ...4\275\234MySQL\344\275\234\344\270\232.md" | 57 +++++++++++++++++++
 ...4\275\234MySQL\347\254\224\350\256\260.md" | 46 +++++++++++++++
 2 files changed, 103 insertions(+)
 create mode 100644 "\344\270\201\344\275\263\344\274\266/20220523-PHP\346\223\215\344\275\234MySQL\344\275\234\344\270\232.md"
 create mode 100644 "\344\270\201\344\275\263\344\274\266/20220523-PHP\346\223\215\344\275\234MySQL\347\254\224\350\256\260.md"

diff --git "a/\344\270\201\344\275\263\344\274\266/20220523-PHP\346\223\215\344\275\234MySQL\344\275\234\344\270\232.md" "b/\344\270\201\344\275\263\344\274\266/20220523-PHP\346\223\215\344\275\234MySQL\344\275\234\344\270\232.md"
new file mode 100644
index 0000000..c7bd9c6
--- /dev/null
+++ "b/\344\270\201\344\275\263\344\274\266/20220523-PHP\346\223\215\344\275\234MySQL\344\275\234\344\270\232.md"
@@ -0,0 +1,57 @@
+# 作业
+
+1.MySQL中新建一个student数据库，里面有个学生信息表user，
+
+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。
+
+
+
+```sql
+CREATE DATABASE student CHARSET utf8;
+use student;
+CREATE TABLE user(
+id int PRIMARY KEY auto_increment,
+name VARCHAR(20) not null,
+score DECIMAL not NULL
+);
+```
+
+```php
+<?php
+
+$conn = mysqli_connect('djl', 'root', 'root', 'student');
+
+if (!$conn) {
+    die("连接失败");
+}
+
+mysqli_query($conn, 'set names utf8');
+$sql = "insert into `user` (`name`,`score`) values 
+('陈小虫',98.5),
+('吴大虫',75.5),
+('陈得胜',66)";
+
+mysqli_query($conn,$sql) or die("数据错误").mysqli_error($conn);
+
+//增加
+$zeng = "insert into `user` (`name`,`score`) values ('成成',96)";
+mysqli_query($conn,$zeng) or die("数据增加错误").mysqli_error($conn);
+
+//修改
+$gai = "update `user`  set `score` = 123 where `id` = 4 ";
+mysqli_query($conn,$gai) or die("数据修改错误").mysqli_error($conn);
+
+//删除
+$shan = "delete from `user` where `id`=4";
+mysqli_query($conn,$shan) or die("数据删除错误").mysqli_error($conn);
+
+// 查询
+$cha = "select * from `user`";
+$chakan = mysqli_query($conn, $cha) or die("数据查看错误") . mysqli_error($conn);
+while ($a = mysqli_fetch_assoc($chakan)) {
+echo $a['id'] . "  " . $a['name'] . "  " . $a['score'] . "<br>";
+}
+```
+
diff --git "a/\344\270\201\344\275\263\344\274\266/20220523-PHP\346\223\215\344\275\234MySQL\347\254\224\350\256\260.md" "b/\344\270\201\344\275\263\344\274\266/20220523-PHP\346\223\215\344\275\234MySQL\347\254\224\350\256\260.md"
new file mode 100644
index 0000000..5d3722c
--- /dev/null
+++ "b/\344\270\201\344\275\263\344\274\266/20220523-PHP\346\223\215\344\275\234MySQL\347\254\224\350\256\260.md"
@@ -0,0 +1,46 @@
+# PHP操作MySQL
+
+### 1.连接服务器
+
+（方式1）连接MySQL服务器同时选择数据库
+
+mysqli_connect（host，username，password，dbname，port，socket）
+
+mysqli_connect（服务器地址，用户名，密码，数据库名，端口号，socket）
+
+```php
+error_reporting(error_level:E_ALL^E_WARNING);
+$conn = mysqli_connect(host，username，password，dbname);
+Var_dump($conn);
+if($conn){
+    echo "连接成功"；
+}else{
+    die("连接失败，错误".mysqli_connect_error());
+}
+
+```
+
+PHP访问数据库
+
+查找错误：
+
+```PHP
+mysql_error()：//获取出错对应的提示信息
+```
+
+查询：
+
+```php
+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
+
+mysql_fetch_assoc()：//获取关联数组，表的表单名字作为数组下标，元素值作为数组元素值
+
+mysqli_fetch_row *($result*);// 从结果集中取得一行作为索引数组
+
+mysqli_fetch_object($result)); // 从结果集中取得一行作为对象
+
+mysqli_affected_rows($connect);// 返回最近一次query操作受影响的行数
+```
+
-- 
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