PHP MySQL查询中的多个条件

Question

I have a database with some records and columns: "type", "id" and others. I would like to select all records with any "type" that's mentioned in array $typearray but without records which id's are in $idarray. I tried to do something like:

$result = mysql_query("SELECT * FROM db 
    WHERE type IN('".implode("','",$typearray)."') 
    AND id NOT IN('".implode("','",$idarray)."') 
    ORDER BY date DESC LIMIT 10");

But it doesn't seem to work - the:

type IN('".implode("','",$typearray)."')

condition works fine but the second does not. At first I thought the issue was with column types - both arrays contains strings, "type" column is a VARCHAR(10) and id is INT, but changing it to string didn't help. What am I doing wrong?

EDIT:

If I print a query I get this:

SELECT * FROM db 
WHERE type IN('apple','tomato','potato') 
AND id NOT IN('20','1','10','15','8') 
ORDER BY date DESC LIMIT 10

The first condition works fine: it selects only apples, tomatoes and potatoes. The second condition does nothing and even if I type manually:

id NOT IN('20','1','10','15','8')

or

id NOT IN('20,1,10,15,8')

or

id NOT IN(20,1,10,15,8)

it still fails.

EDIT2:

Actually forget it. I'm an idiot. I've mixed up my variables a bit...

Answer 1

You should try this query, or at least do a echo $result, " ";, into mysql workbench to see what it give.

And I'd say the default behavior to have when a query does not work: first in Mysql Workbench (or any SQL runner like Toad, Squirrel ...)

$result = mysql_query("SELECT * FROM db 
    WHERE type IN('".implode("','",$typearray)."') 
    AND id NOT IN('".implode("','",$idarray)."') 
    ORDER BY date DESC LIMIT 10");

If $typearray is empty, you are looking for type IN (''), which might never matches. If $idarray is empty, you are looking for id not in ('') which might always matches.

And if $typearray or $idarray contains invalid character, you will get an error.

[edit] by the way, if $typearray or $idarray may contains invalid character, you might use array_map and mysqli_escape_string:

$result = mysql_query("SELECT * FROM db 
    WHERE type IN('".implode("','", array_map('mysql_escape_string', $typearray))."') 
    AND id NOT IN('".implode("','", array_map('mysql_escape_string', $idarray))."') 
    ORDER BY date DESC LIMIT 10");