From 84f878d339c078c8650540f1615af61d3bfe9387 Mon Sep 17 00:00:00 2001
From: xushiheng <2363492796@qq.com>
Date: Mon, 23 May 2022 22:40:15 +0800
Subject: [PATCH] 3

---
 ...hp\346\225\260\346\215\256\345\272\223.md" | 95 +++++++++++++++++++
 1 file changed, 95 insertions(+)
 create mode 100644 "\345\276\220\350\257\227\346\201\222/20220523-php\346\225\260\346\215\256\345\272\223.md"

diff --git "a/\345\276\220\350\257\227\346\201\222/20220523-php\346\225\260\346\215\256\345\272\223.md" "b/\345\276\220\350\257\227\346\201\222/20220523-php\346\225\260\346\215\256\345\272\223.md"
new file mode 100644
index 0000000..bb9e040
--- /dev/null
+++ "b/\345\276\220\350\257\227\346\201\222/20220523-php\346\225\260\346\215\256\345\272\223.md"
@@ -0,0 +1,95 @@
+```sql
+-- Mysql中新建个student数据库，里面有个学生信息表user
+create database Student charset utf8;
+use Student;
+create table user(
+id int primary key auto_increment,
+name varchar(100) not null,
+score decimal(4,1) not null
+);
+```
+
+
+
+```php
+// 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。
+
+<?php
+//数据库连接
+$con = mysqli_connect('127.0.0.1','root','123456','Student');
+mysqli_query($con,'set names utf8');
+if (!$con){
+    die("连接失败:".mysqli_connect_error());
+}
+$sql1="insert into `user`  value (null ,'陈小龙','98.5'),(null ,'吴大虫','75.5'),(null ,'陈得胜','66')";
+//增加数据
+$res1 = mysqli_query($con,$sql1);
+if ($res1){
+    echo "添加成功 <br>";
+}else{
+    echo "添加失败 <br>";
+}
+//删除数据
+$sql2= "delete from `user` where `id`=10";
+$res2= mysqli_query($con,$sql2);
+if ($res2){
+    echo "删除成功 <br>";
+}else{
+    echo "删除失败 <br>";
+}
+//修改数据
+$sql3= "update `user` set `name`='小明' where `id`=12  ";
+$res3 = mysqli_query($con,$sql3);
+if ($res3){
+    echo "修改成功<br>";
+}else{
+    echo "修改失败<br>";
+}
+//查找数据
+$sql4 = "select * from `user`";
+$res4 = mysqli_query($con,$sql4) or die("查找失败<br>");
+
+
+while($a=mysqli_fetch_assoc($res4) ){
+    echo $a['id']." ".$a['name']." ".$a['score']."<br>";
+}
+
+
+
+
+```
+
+连接数据库：
+
+```php
+mysqli_connect(服务器地址,用户名,密码,数据库名,端口号,socket );
+```
+
+
+
+查找错误：
+
+```php
+mysql_error()：//获取出错对应的提示信息
+```
+
+
+
+查询：
+
+```php
+mysqli_fetch_all*($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
+```
+
+
+
-- 
Gitee