MySQL Syntax error, using PHP

Question

Thanks in advance for any help I get!

I'm writing a script in PHP to delete all users with (by this point) an already set expiration date. I'm getting a MySQL syntax error, and I can't figure out what I'm doing wrong.

ERROR:

Query failed: 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 ''tablename' WHERE date='01' at line 1

CODE:

$query="DELETE FROM 'tablename' WHERE date='$exdate'";

I did an echo just to test the variable was being passed properly, and it is.

EDIT: "dbname" changed to "tablename" just to clarify, my mistake.

SOLVED: Thanks again for the help, I wasn't using the proper "quotation mark syntax". Thanks!

Answer 1

不要在表名上使用单引号（'），而应使用（`）（与键盘上[〜]的小写相同）。

Answer 2

You may need tick marks around date :

$query="DELETE FROM 'dbname' WHERE `date`='$exdate'";

However, from your error, it appears the syntax is not correct earlier. If you are doing some sort of escaping, that may be causing this error.

Answer 3

date是保留关键字，您不能在查询中使用它，请使用date

Answer 4

Don't single quote your table name, if anything use magic quotes (`)

You should not be building the query by concatenating strings.

To avoid potential issues with SQL injection, it would be wise to use prepared queries.

I've just confirmed this on a mysql server

mysql> delete from 'sessions' where `last_activity` = 0;
ERROR 1064 (42000): 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 ''sessions' where `last_activity` = 0' at line 1
mysql> delete from sessions where `last_activity` = 0;
Query OK, 0 rows affected (0.00 sec)

Answer 5

Simplest correction

$query="DELETE FROM tablename WHERE date='$exdate'";

Best (safest) version is

$query="DELETE FROM `tablename` WHERE `date`='$exdate'";

Explanation :

tableNames, columnnames etc are enclosed in quotes like `name` instead of 'name'
Enclosing them in `` is optional usually, but if your tablename,columnane is some
what special word e.g 'table' then you can use `table` and not simply table

Here you can use

`tablename` (best) tablename (simplest) but not 'tablename'(worng)