From 4317c8fc00cd24b524607f901204f84854adcda7 Mon Sep 17 00:00:00 2001
From: unknown <2576065650@qq.com>
Date: Mon, 23 May 2022 23:33:08 +0800
Subject: [PATCH] d

---
 ...36\345\210\240\346\224\271\346\237\245.md" | 84 +++++++++++++++++++
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 create mode 100644 "\350\246\203\346\270\270/20220523-MySQL\345\242\236\345\210\240\346\224\271\346\237\245.md"

diff --git "a/\350\246\203\346\270\270/20220523-MySQL\345\242\236\345\210\240\346\224\271\346\237\245.md" "b/\350\246\203\346\270\270/20220523-MySQL\345\242\236\345\210\240\346\224\271\346\237\245.md"
new file mode 100644
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+++ "b/\350\246\203\346\270\270/20220523-MySQL\345\242\236\345\210\240\346\224\271\346\237\245.md"
@@ -0,0 +1,84 @@
+# 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MySQL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。
+
+
+
+```php
+<?php
+//链接MySQL服务器
+error_reporting(E_ALL^E_WARNING);
+$hiuh = mysqli_connect('localhost','root','root','student');
+
+if(!$hiuh){
+    die("连接失败,发生错误！".mysqli_connect_error());
+}
+
+mysqli_query($hiuh,'set names utf8');//防止乱码
+
+//1.添加数据
+$a = "insert into `user` (`name`,`score`) values  ('陈小龙','98.5'),('吴大虫','75.5'),('陈得胜','66')";
+$dd = mysqli_query($hiuh,$a);
+if ($dd){
+    echo "添加成功！";
+}else{
+    echo"添加失败！";
+}
+
+echo "<br>";
+
+
+//2.删除数据
+$b = "delete from `user` where `id` = 1";
+$da = mysqli_query($hiuh,$b) or die ("删除失败!").mysqli_error($hiuh);
+if(da){
+    echo"删除成功!";
+}
+
+echo "<br>";
+
+
+//3.修改数据
+$c = "update `user` set `score` = 95 where `id` = 2";
+$dc = mysqli_query($hiuh,$c);
+if ($dc){
+    echo "修改成功！";
+}else{
+    echo"修改失败！";
+}
+
+echo "<br>";
+
+
+
+//4.查询数据
+$d = "select * from `user`";
+$ds= mysqli_query($hiuh,$d) or die ("发生错误".mysqli_error($hiuh ));
+while ($ss = mysqli_fetch_assoc($ds)) {
+    echo $ss['id'] . "  " . $ss['name'] . "  " . $ss['score'] . "<br>";
+}
+$hj=mysqli_affected_rows($hiuh);
+if($hj>0){
+    echo "查找到".$hj."行结果";
+}else if($hj==0){
+    echo "无受影响";
+}else{
+    echo "查询错误";
+    die("查找数据失败！错误为：".mysqli_error($hiuh));
+}
+```
\ No newline at end of file
-- 
Gitee