Fellow monasterians

Not sure whether this is a MySQL, DBI, or Perl question, or all three.

I want to retrieve data from a table by matching any number of values in one particular column. The number of values I'm trying to match will change from query to query. Here's my sample table:

+-----+------------+
| id  |  somedata  |  
+-----+------------+
|  1  |  aaaaaaaa  |  
+-----+------------+
|  2  |  bbbbbbbb  |  
+-----+------------+
|  3  |  cccccccc  |  
+-----+------------+
|  4  |  dddddddd  |  
+-----+------------+
|  5  |  eeeeeeee  |  
+-----+------------+

[download]

Example: in the first query I want to retrieve 'somedata' by matching 'id's 2,3, and 5. And in the next query just: 2. And in the next query: 1-5. So, the expected:

SELECT somedata FROM table WHERE id = 2 OR id = 3...

wouldn't work because the number of OR conditionals would need to vary. Building a dynamic query string seems like it could get unwieldy, especially if you have lots of ids to match:

my $stmt = "SELECT somedata FROM table WHERE id = $ids_to_match[0]";

for my $i ( 1 .. $#ids_to_match ) {
   $stmt .= " OR id = $ids_to_match[$i]";
}

[download]

I considered multiple queries:

for my $i ( 0 .. $#ids_to_match ) {
   my $stmt = "SELECT somedata FROM table WHERE id = $ids_to_match[$i]
+";
   [execute, fetch, push into AoH]
}

[download]

but seemed like a drain on the server. So, what am I not considering? Have I missed some key MySQL or DBI method? Thanks!


—Brad
"Don't ever take a fence down until you know the reason it was put up." G. K. Chesterton

In reply to Retrieving multiple records from database by bradcathey

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