PHP / MYSQL选择单个对象返回col名称而不是value

Question

I can't figure out why, but when I run this script, it's only displaying the $row[0] column and not any other columns I put in.

$mlsnum = mysql_real_escape_string($_GET['mlsnum']);

$link = mysql_connect('localhost','user','password');
mysql_select_db('singleprop', $link);

$query = "SELECT 'MSTLISTPRC' FROM jos_mls WHERE MSTMLSNO = '".$mlsnum."';";

$return = mysql_query($query);

$result = mysql_fetch_array($return);

$price = $result['MSTLISTPRC'];

echo $price;

Instead of echoing the value of the column that meets the WHERE criteria, it echoes the column name.

Answer 1

Drop the single quotes. They indicate a literal string.

SELECT MSTLISTPRC ...

A string is a sequence of bytes or characters, enclosed within either single quote (“ ' ”) or double quote (“ " ”) characters. Examples:

'a string'

"another string"

Documentation

You also need to use an associative array in order to call the column name:

$result = mysql_fetch_assoc($return);

Also, please stop using mysql_ functions. They are no longer maintained and are officially deprecated . See the red box ? Learn about prepared statements instead, and use PDO or MySQLi - this article will help you decide which.

Answer 2

删除'MSTLISTPRC'周围的引号=问题已解决

Answer 3

For selecting column you do not use quotes. We use "`" character

Answer 4

change $query = "SELECT 'MSTLISTPRC' FROM jos_mls WHERE MSTMLSNO = '".$mlsnum."';"; to $query = "SELECT `MSTLISTPRC` FROM jos_mls WHERE MSTMLSNO = '".$mlsnum."';";