PHP操作MYSql问题
<?php
$host = '127.0.0.1';
$root = 'root';
$pass = 'XXX';
$dbna = 'test';
$conn = mysqli_connect($host,$root,$pass,$dbna);
$name = null;
$password = null;
$name_en = null;
$department = null;
$position = null;
$sql = "insert into person (name,password,name_en,department,position)
value('$name','$password','$name_en','$department','$position ')";
if(mysqli_query($conn,$sql)){
echo ("创建成功");
}else{
echo (mysqli_error($conn));
}
?>MYSQL数据库已设置都不允许NULL，通过PHP操作插入数据时，如果把null赋值给变量，然后通过变量插入，仍然能插入数据。
如果，直接设置null则会正常的提示不允许null值，
$sql = "insert into person (name,password,name_en,department,position)
value('$name','$password','$name_en','$department',null)";为什么通过变量形式还是能够插入null值
jugge浏览 9630回答 8
8回答
-
qq_ty_1
你带单引号了吧 所以是 'null'字符串而已吧 -
慕神6678310
php语言比较简单 -
天使之翼死神之镰
null改成NULL试试看 -
慕妹4267064
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-
凯旋132
首先我向展示两个值,看一下一不一样,1.'null' 2.null 这两个值是不一样的,'null'是一个普通的字符串,而null则表示为空 -
林子懿
可能是这样的，数据库设置的默认值是NULL，所以你输入空的时候就是NULL你可以给数据库字段一个默认值 -
QJAutumn
你可以这样{$name} -
ZM77
单引号不解析变量，双引号才解析变量 -
风儿风光
给变量加上{} -
Sun丶发发
你可以打印一下sql，我觉得PHP会把你的变量当成普通字符串
随时随地看视频慕课网APP
MySQL
PHP