在WHERE子句中使用变量 [英] Using a variable in the WHERE Clause

问题描述

我是MySQL和PHP的新手.我有一个HTML表单，我想将1变量从该表单传递到我的PHP代码，然后在数据库上运行查询，以获取将变量保存在序列"列下的记录.当我对要查找的序列"进行硬编码时，我可以很好地运行它，但是当我尝试使用变量时，我得到了一个错误.

I am a newbie in MySQL and PHP. I have a HTML form where I would like to pass 1 variable from to my PHP code and then run a query on my database for the record that holds that variable under the column 'Serial'. I can run it fine when I hard code the 'serial' that I want to look up but when I try with the variable I get an error.

任何帮助将不胜感激！或者是更好的方法.

Any help would greatly be appreciated! Or a better way to do this.

这是我的错误:Unknown column 'amg002' in 'where clause'

这是我的代码；

$serial= $_POST['Serial'];
echo $serial;

//Connect To Database

$link = mysql_connect($hostname,$username, $password) OR DIE ('Unable to connect to database! Please try again later.');
echo "Connected to MySQL<br />";

//Select the database - 'SiteInfo'

// Collects data from "SiteInfo" table

//****This is where I am running into the error*** 

$sql = 'SELECT * FROM `SiteInfo` WHERE `Serial` ='.$serial; 

// This works!!!

//$sql = 'SELECT * FROM `SiteInfo` WHERE `Serial` ="amg002";';   

$data = mysql_query($sql)
or die(mysql_error());

// puts the "SiteInfo" info into the $info array

$info = mysql_fetch_array( $data );

//Print out the contents of the entry

echo "Site Name: ".$info['SiteName'] . "<br /";
Print "Serial Number: ".$info['Serial'] . "<br />";
Print "Location: ".$info['Location'] . "<br />";

// Close the database connection

mysql_close($link); 
echo "Connection Closed. <br />";

推荐答案

我同意其引用问题，但这是我的代码的外观.

I agree its a quote issue, but here is how my code would look.

  $sql = 'SELECT * FROM SiteInfo WHERE Serial = "' . $serial . '"';

或

  $sql = "SELECT * FROM 'SiteInfo; WHERE 'Serial' = \"$serial\"";      

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