From c8aeeee637c1b0ef309b9d958814db4a6557fe5a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E5=88=98=E4=BD=B3=E4=B8=BD?= <2898669424@qq.com>
Date: Tue, 24 May 2022 12:48:46 +0800
Subject: [PATCH] dd

---
 ...40\345\242\236\346\224\271\346\237\245.md" | 69 +++++++++++++++++++
 1 file changed, 69 insertions(+)
 create mode 100644 "\345\210\230\344\275\263\344\270\275/20220524-\345\210\240\345\242\236\346\224\271\346\237\245.md"

diff --git "a/\345\210\230\344\275\263\344\270\275/20220524-\345\210\240\345\242\236\346\224\271\346\237\245.md" "b/\345\210\230\344\275\263\344\270\275/20220524-\345\210\240\345\242\236\346\224\271\346\237\245.md"
new file mode 100644
index 0000000..ca1f954
--- /dev/null
+++ "b/\345\210\230\344\275\263\344\270\275/20220524-\345\210\240\345\242\236\346\224\271\346\237\245.md"
@@ -0,0 +1,69 @@
+作业
+
+```php
+<?php
+/**
+ * Created by PhpStorm.
+ * User: Administrator
+ * Date: 2022/5/23
+ * Time: 10:50
+ */
+error_reporting(E_ALL^E_WARNING);
+
+$conn=mysqli_connect("localhost","root","123456","student") or die("连接失败，错误为：".mysqli_connect_errno($conn));
+
+mysqli_query($conn,"set names utf8");//让添加的数据不会乱码
+
+//添加数据
+$sql_z="insert into `user`(`name`,`score`) values ('陈小龙','98.5'),('吴大虫','75.5'),('陈得胜','66')";
+$res_z=mysqli_query($conn,$sql_z) or die("添加数据失败！错误为：".mysqli_error($conn));
+if($res_z){
+    echo "添加数据成功";
+}
+echo "<br>";
+echo "添加了".mysqli_affected_rows($conn)."行数据";//查看受影响的行数
+echo "<br>";
+
+//删除数据
+$sql_s="delete from `user` where id>3";
+$res_s=mysqli_query($conn,$sql_s) or die("删除数据失败！错误为：".mysqli_error($conn));
+if($res_s){
+    echo "删除数据成功";
+}
+echo "<br>";
+echo "删除了".mysqli_affected_rows($conn)."行数据";//查看受影响的行数
+echo "<br>";
+
+//修改数据
+$sql_x="update `user` set `name`='表哥' where id=3";
+$res_x=mysqli_query($conn,$sql_x) or die("修改数据失败！错误为：".mysqli_error($conn));
+if($res_x){
+    echo "修改成功";
+}
+echo "<br>";
+echo "修改了".mysqli_affected_rows($conn)."行数据";//查看受影响的行数
+echo "<br>";
+
+//查找数据
+$sql_c="select * from `user`";
+$res_c=mysqli_query($conn,$sql_c) or die("查找数据失败！错误为：".mysqli_error($conn));
+while($a=mysqli_fetch_assoc($res_c)){
+    echo $a['id']."|".$a['name']."|".$a['score']."<br>";
+}
+$cou=mysqli_affected_rows($conn);
+if($cou>0){
+    echo "查找到".$cou."行结果";
+}else if($cou==0){
+    echo "无受影响";
+}else{
+    echo "查询错误";
+    die("查找数据失败！错误为：".mysqli_error($conn));
+}
+create database student charset utf8;
+use student;
+create table user(
+id int primary key auto_increment,
+name varchar(10) not null,
+score DECIMAL(3,1) not null
+);
+```
\ No newline at end of file
-- 
Gitee