遇到SQL查询问题

Question

I'm using this query (I changed it):

// SQL query
$squl = "INSERT INTO 'messages' ('id','name' ,'email' ,'subject' ,'content','userid') VALUES ( null,'".$name."',  '".$mail."',  '".$subject."',  '".$content."','');"; 

// mysql query
$query = mysql_query($squl) or die("message query problem: ".  mysql_error()); 

I get this error:

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 ''messages' ('id','name' ,'email' ,'subject' ,'content','userid' )VALUES ( null,'' at line 1

What is causing this?

Answer 1

.``) You used a period here instead of a comma so the function is only receiving 5 columns when it needs 6.

Update:

As the commenter below points out, you've replaced the backticks with quotation marks.

$squl="INSERT INTO `messages` (`id`,`name` ,`email` ,`subject` ,`content`,`userid` )VALUES ( null,'$name',  '$mail',  '$subject',  '$content','');";

Answer 2

(id,name ,email ,subject ,content,userid )

( NULL,".$name.", ".$mail.", ".$subject.", ".$content."**.**``);

you are using '.' instead of ,

Answer 3

Well, that's about the clearest message you get from SQL. You try to insert 5 values into 6 columns.

The problem that there's no comma between the last two values. Instead there's a . which makes the parser think it's only one value.

Answer 4

You are trying to insert into 6 columns:

1. id
2. name
3. email
4. subject
5. content
6. userid

But have only specified 5 values:

1. NULL
2. $name
3. $mail
4. $subject
5. $content

Answer 5

You've got a dot where you should have a comma:

".$subject."`,  `".$content."`.``);";

Change that last dot to a comma and you should be golden

Answer 6

You've got 6 fields in your fields list, but are inserting only 5 values in your values list. Looks like you've got a . instead of a , :

`,  `".$subject."`,  `".$content."`.``
                                   ^--- here

As well, there is NO reason to use repeated string concatenation as you are. PHP can insert variables into double-quoted strings quiet easily:

$sql = "INSERT INTO .... (...) VALUES (NULL, '$name', '$mail', '$subject', '$content', '')";

Note that the 'null' value is not quoted. Backticks are there to escape reserved words. If you intend to insert a real database null, then use the bare word null . If you want a literal string 'null' to go in, then quote it normally: 'null' .

Answer 7

You have six fields listed the first set of parentheses and only five fields in VALUES. That's what column count means.