diff --git "a/\350\246\203\346\241\202\350\216\262/20220523myaql.txt" "b/\350\246\203\346\241\202\350\216\262/20220523myaql.txt"
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+PHP操作MySQL
+1、掌握php访问数据库的基本步骤
+连接数据库服务器
+
+选择数据库
+
+​ 连接mysql服务器同时选择数据库
+
+​ mysqli_connect(host服务器地址,username用户名，password密码，dbname数据库名称，port端口，socket)
+
+$conn = mysqli_connect('localhost','lh','123456','student');
+//变量未知，用var_dump来查看，
+var_dump($conn);
+//或者用if返回对象或错误
+if($conn){
+    echo "连接成功";
+}else{
+    die("连接失败，错误".mysqli_connect_error());
+}
+​ 连接mysql服务器，再连接数据库
+
+​ mysqli_connect(host服务器地址,username用户名，password密码)
+
+​ mysqli_select_db($link,db_name)
+
+error_reporting(E_ALL ^ E_WARNING);//^表示排除，隐藏所有错误，除了warning警告
+$a = mysqli_connect('localhost','lh','123456');
+if(!$a){
+    die("连接失败，错误".mysqli_connect_error());
+}
+$b = mysqli_select_db($a,'student');
+if(!$b){
+    die("连接数据库失败，错误".mysqli_error($a));
+}
+echo "数据库连接成功";
+2、掌握MySQL扩展函数
+执行sql语句
+
+增，删，改，查
+
+$mysqli_query()
+
+增
+insert into `student` (`name`) values('值');
+删
+delete from `student` where `id`=2;
+改
+update `studnet` set `name` = '值' where <条件>;
+查
+select * from `student`;
+增
+$sql = "insert into `student<表名>`(`name<字段名>`) values('值')";
+//$result = mysqli_query($conn,$sql);
+//if($result){
+//    echo "添加成功";
+//}else{
+//    echo "添加失败";
+//}
+删
+$sql ="delete from `student` where `id`=2";
+//$result = mysqli_query($a,$sql) or die("执行错误".mysqli_error($a));
+//if($result){
+//    echo "删除成功";
+//}else{
+//    echo "删除失败";
+//}
+改
+$sql = "update `student` set `name` ='值' where <条件>";
+
+
+$num = mysqli_affected_rows($a);//返回最近一次query操作受影响的行数，0表示没有受影响的行数，-1表示返回错误，>0表示受影响的行数
+
+if($num==0){
+
+echo "没有对应数据";
+
+}else if($num<0){
+
+die("程序失败");
+
+}else{
+    echo "成功，删除了".$num."行";
+}
+
+处理结果集
+
+
+查
+$sql = "select * from `student`";
+$result = mysqli_query($a,$sql) or die("执行错误".mysqli_error($a));
+//返回一个二维数组
+$all_res =mysqli_fetch_all($result);
+//返回一行数组，包含索引和关联数组，每次之显示一行，要显示多行要用循环
+$all_res =mysqli_fetch_array($result);
+//以关联数组为形式返回一行，每次自动下一行
+$all_res =mysqli_fetch_assoc($result);
+//以索引数组为形式返回一行，每次自动下一行
+$all_res =mysqli_fetch_row($result);
+//以对象为形式返回一行，每次自动下一行
+$all_res =mysqli_fetch_object($result);
+关闭连接
+
+mysqli_close($conn);
+创建数据库：
+
+create database student charset utf8;
+use student;
+
+
+
+create table user(
+id int auto_increment primary key,
+name varchar(20) not null,
+score decimal(2,1) not null
+
+);
+
+
+
+数据库查询：
+
+<?php
+
+
+error_reporting(E_ALL ^ E_WARNING);
+$db = mysqli_connect("127.0.0.1", "root", "root", "student");
+
+if (!$db) {
+    echo "连接失败" . mysqli_connect_error();
+    die();
+}
+
+// set names utf8;
+mysqli_query($db, 'set names utf8');
+$ins = "insert into `user`(`name`,`score`) values ('陈小龙',98.5),('吴大虫',75.5),('陈得胜',66)";
+$re = mysqli_query($db, $ins);
+
+if (!$re) {
+
+    die("插入失败" . mysqli_error($db));
+}
+
+
+$dele = "delete from `user` where `id`=3";
+$re_dele = mysqli_query($db, $dele);
+
+if (!$re_dele) {
+    die("删除失败" . mysqli_error($db));
+}
+
+$up = "update `user` set `name`='小明' where  `id`=1";
+$re_up = mysqli_query($db, $up);
+
+if (!$re_up) {
+    die("更新失败" . mysqli_error($db));
+}
+
+
+
+$select = "select * from `user`";
+$re_select = mysqli_query($db, $select);
+if (!$re_select) {
+    die("出错了" . mysqli_error($db));
+}
+mysqli_query($db,"set names utf8");
+
+while ($arr = mysqli_fetch_assoc($re_select)) {
+    echo $arr['id'].$arr['name'].$arr['score']."<br>";
+
+}
+
+
+mysqli_close($db);
+
+
+
+