-------------- Original message ----------------------
From: -{ Rene Brehmer }- <metalbunny@xxxxxxxxxxxxxx>
> Task at hand: deleting or selecting (same difference) several numbers of
> records using only 1 query.
>
> My first version simply looped through all the ticked off IDs and ran a
> single query for each delete routine. I've still not suceeded in getting
> the delete queries to work on multiple tables at once, despite the column
> names being the same. But besides this:
Multi-table deletes are new to mySQL 4.0, so if you are running a 3.x release they won't work.
http://dev.mysql.com/doc/mysql/en/DELETE.html
>
> My current version generates, for multi-select cases, queries like this:
>
> DELETE FROM the_table WHERE `ID`='1' OR ID`='2' OR `ID`='3' OR `ID`='4' OR
> `ID`='5' OR `ID`='6'
>
> or similar with the SELECT statement.
[snip lots of stuff]
> DELETE FROM the_table WHERE `ID` ISIN(1,2,3,4,5,6)
use IN http://dev.mysql.com/doc/mysql/en/Comparison_Operators.html#IDX1268
If you know all the values in the array are escaped and safe you can just use implode() to make the list for IN
$string = implode("','",$array);
$sql = "SELECT FROM $table WHERE col_name IN('$string')";
Notice I added single quotes around the string, that is because they will be missing since implode only sticks the string between array elements.
However, you'd need a join that makes sense for a multi-table delete. I don't know if it will work with a union, I have never tried, maybe somone else will chime in.
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