难道PHP的MySQL不支持？

Question

Ok, I have a rather long query that only fails when I add an IN statement. The following query works great in MySQL console directly but returns nothing when done in PHP.

$db = mysql_connect('localhost', 'something', 'somepassword');

$query = "SELECT * 
FROM alt_table f 
INNER JOIN alt_fac_table_c cl ON (f.id = cl.alt_table2_ida) 
INNER JOIN alt_table c ON (cl.alt_table_idb = c.id) 
LEFT OUTER JOIN alt_table_contacts_c con ON (f.id = con.alt_table_ida) 
LEFT OUTER JOIN contacts cc ON (con.alt_table_idb = cc.id) 
WHERE c.name = 'myname' 
AND f.state IN ('AL','FL') ORDER BY fname;";

$result = mysql_query($query);

The problem is not with connecting with the database and its not with the query itself. Obviously I have renamed a couple things but the query is the same. In PHP it returns nothing (No errors, no nothing) but in SSH/Console it returns all of the rows I need.

If I remove "AND f.state IN ('AL','FL') ORDER BY fname;";" the query works but gives me every single state. So the big question is... does PHP have a Problem with the IN statement?

UPDATE FIX It ended up being a problem with the post data. I was posting the single quotes for 'AL',FL'. It was apparently encoding them strangely upon post. I assume some sort of security feature. I took the quote out of the post and added it it server side PHp instead and it works.

Answer 1

You've neglected to select a database...

mysql_select_db('database_name', $db);

This should go just after the call to the mysql_connect() function.

http://uk.php.net/mysql_select_db

It will provide a true/false on success so you can use the following to ensure it connects.

if( ! mysql_select_db('database_name', $db) ) {
    die('failed to select database');
}

In addition to the above, you can modify the following line

$result = mysql_query($query);

To be more like the following. This will show you any errors returned, and in your case a No database selected error

$result = mysql_query($query) or die(mysql_error());

Answer 2

From http://php.net/manual/en/function.mysql-query.php

The query string should not end with a semicolon.

Try removing just that and see if it works.

Answer 3

It ended up being a problem with the post data. I was posting the single quotes for 'AL',FL'. It was apparently encoding them strangely upon post. I assume some sort of security feature. I took the quote out of the post and added it it server side PHp instead and it works.