PHP操作MYSql问题

Question

<?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

Answer 1

你带单引号了吧 所以是 'null'字符串而已吧

Answer 2

php语言比较简单

Answer 3

null改成NULL试试看

Answer 4

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Answer 5

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

Answer 6

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

Answer 7

你可以这样{$name}

Answer 8

单引号不解析变量，双引号才解析变量

Answer 9

给变量加上{}

Answer 10

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

Answer 11

给变量加{}