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+ # 笔记
+
+```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 ($result);
+// 从结果集中取得一行作为索引数组
+mysqli_fetch_object($ret)); 
+// 从结果集中取得一行作为对象
+mysqli_affected_rows($conn);
+// 返回最近一次query操作受影响的行数
+
+
+```
+
+
+
+
+
+#  作业
+
+题目：![img](https://tva1.sinaimg.cn/large/e6c9d24egy1h2ib4qh0bgj218g0p0mzw.jpg) 
+
+
+
+```mysql
+CREATE DATABASE student charset utf8;
+use student;
+CREATE TABLE user(
+id int auto_increment PRIMARY key,
+name VARCHAR(20) NOT NULL,
+score DECIMAL(10,2) NOT NULL
+);
+
+INSERT INTO user(name,score)VALUES('陈小龙','98.5'),
+('吴大虫','75.5'),
+('陈得胜','66');
+```
+
+
+
+```php
+<?php
+
+//防止报错
+error_reporting(E_ALL^E_WARNING);
+// 连接服务器，选数据库
+ $aa=mysqli_connect("localhost","root","123456","student") or die("错误:".mysqli_connect_error());
+
+//$add = mysqli_connect("localhost","root","root","student");
+//mysqli_query($add,"set names utf8");
+//增加数据
+$sql = "INSERT INTO user(name,score)VALUES('小陈',83),
+('大陈',16),
+('老陈',59),
+('老老陈',66)";
+$result =mysqli_query($aa,$sql);
+if($result){
+    echo "添加成功！";
+}else{
+    echo"添加失败！".mysqli_error($aa);
+}
+//删除数据
+$sqla="delete from `user` where id>3";
+$result1=mysqli_query($aa,$sqla);
+if ($result1){
+    echo "删除成功";
+}else{
+    echo "删除失败";
+}
+echo "  ";
+//修改数据
+$sqlb="update `user` set name='老老陈', score=59.9 where id=1";
+$result2=mysqli_query($aa,$sqlb);
+if ($result2){
+    echo "修改数据成功";
+}else{
+    echo "修改数据失败";
+}
+echo "<br>"."查询到当前数据为：";
+//查询数据
+$sqlc="select * from `user` ";
+$cc=mysqli_query($aa,$sqlc);
+$kk=mysqli_fetch_all($cc);
+foreach ($kk as $kkk){
+    foreach ($kkk as $kk){
+        echo $kk." ";
+    }
+}while($b=mysqli_fetch_assoc($cc)){
+    echo $b['id']."姓名为：".$b['name']."成绩为：".$b['score'];
+}
+```
+