更新SQL数据库中的BIT字段时出错（使用PHP PDO驱动程序）

Question

I have the following code:

$SQL = "UPDATE jobs
        SET read = '1'
        WHERE id = '$job_id'";

$STH = $DBH->prepare($SQL);
$STH->execute();

read is a field in the table with a data type of BIT . The current data inside this field is 0 (false), and I'm trying to change it to 1 (true). However, I am getting this error:

Message: SQLSTATE[42000]: Syntax error or access violation: 1064 You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'read = '1' WHERE id = '25'' at line 2

I can't see any syntax errors, so what is the problem?

Answer 1

READ is a reserved word in MySQL.

You will need to quote it in order to use it as column name:

$SQL = "UPDATE jobs
        SET `read` = '1'
        WHERE id = '$job_id'";

This is why a quote everything in every query, to avoid problems like this. Remember, quoting object names (tables, columns etc) must be done with backticks : `