mysqli插入错误语法不正确 [英] mysqli insert error incorrect syntax

问题描述

我知道很多人偶尔也会遇到相同的错误，但是我查看了以前的所有答案和我的代码，并且尝试了带反斜线和不带反斜线的col 这是我当前的代码 我也尝试过使用$var以及$var但相同的

I know a lot of people have the same error occasionally however I have looked at all previous answers and my code and i have tried col with and without backticks Here is my current code I also have tried with $var as well as just $var but same

if(!empty($_POST['email'])){
 $date = date('dmY'); #Todays Date
 $ip = str_replace('.','',$_SERVER['REMOTE_ADDR']); #Visitor IP
 $verify = md5($date.$ip); #MD5 ENCRYPT THE 2 VALUES
 $fname = $_POST['fname'];
 $lname = $_POST['lname'];  
 $email = $_POST['email'];
 $password = md5($_POST['password']);
 $link = mysqli_connect($dbh,$dbu, $dbp, $dbn);

 $query = mysqli_query($link, "INSERT INTO `users` (`email`,`fname`,`lname`,`verify`,`password`,`joined`)
VALUES($email,$fname,$lname,$verify,$password,$date)");

 if($query){ 
  echo "inserted"; 
 }
 else { 
  echo mysqli_error($link);
 }

表中还有其他列，但是只有上面我要添加数据的其他列可以最初使用默认值

There are other columns in the table however its only the above columns I want to add data for the rest can use default values initially

我一直在看这段代码很久了，我无法发现问题，我知道这很愚蠢

I've been looking at this code for so long now I just cant spot my problem, I know its something silly

推荐答案

向SQL查询中添加变量的最防错的方法是通过准备好的语句将其添加.

The most mistake-proof way to add a variable into an SQL query is to add it through a prepared statement.

因此，对于您运行的每个查询，如果至少要使用一个变量，则必须用占位符代替它，然后准备查询，然后执行它，并分别传递变量.

So, for every query you run, if at least one variable is going to be used, you have to substitute it with a placeholder, then prepare your query, and then execute it, passing variables separately.

首先，您必须更改查询，添加占位符代替变量.您的查询将变为:

First of all, you have to alter your query, adding placeholders in place of variables. Your query will become:

$sql = "INSERT INTO users (fname, lname) VALUES (?, ?)";

然后，您将必须准备它，绑定变量并执行:

Then, you will have to prepare it, bind variables, and execute:

$stmt = mysqli_prepare($conn, $sql);
mysqli_stmt_bind_param($stmt, "ss", $fname, $lname);
mysqli_stmt_execute($stmt);

如您所见，这只是三个简单的命令:

As you can see, it's just three simple commands:

• prepare()，使用占位符发送查询
• bind_param，您在其中发送带有类型的字符串("s"用于字符串，并且可以将其实际用于任何类型)，而不是实际变量.
• 和execute()

这样，您始终可以确保添加到查询中的数据不会引起单个SQL语法错误！另外，此代码也可以防止SQL注入！

This way, you can always be sure that not a single SQL syntax error can be caused by the data you added to the query! As a bonus, this code is bullet-proof against SQL injection too!

非常重要的一点是要理解，仅在变量周围加上引号还不够，并且最终会导致无数问题，从语法错误到SQL注入.另一方面，由于预准备语句的本质，它是一种防弹解决方案，无法通过数据变量引入任何问题.

It is very important to understand that simply adding quotes around a variable is not enough and will eventually lead to innumerable problems, from syntax errors to SQL injections. On the other hand, due to the very nature of prepared statements, it's a bullet-proof solution that makes it impossible to introduce any problem through a data variable.

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