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mysql stored proc parameter question

Posted on 2011-09-06
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Last Modified: 2012-05-12
Hi,

I have a field with text that has numbers separated by commas. I want to only return lines that have the passed number in the field (between commas).

Is there a way i can pass a number as my stored proc param and include it in my query?

Thanks in advance
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Question by:basil365
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8 Comments
 
LVL 28

Expert Comment

by:strickdd
ID: 36490039
you can run the field through a split function, but that can be substantial overhead. The best way I have come up with is to make sure the field always starts and ends with a comma and the searching

where MyField LIKE '%,Number,%'
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Author Comment

by:basil365
ID: 36490077
i tried that but i dont know how to concatenate the variable 'Number' into the like clause?
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LVL 28

Expert Comment

by:strickdd
ID: 36490186
I belive in MySQL, it is simply:

columnName LIKE '%$MySearchTerm%'
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LVL 8

Accepted Solution

by:
stalhw earned 300 total points
ID: 36490193
ok, here's an example:

CREATE PROCEDURE foo.bar (IN _Number varchar(20) )
BEGIN
SELECT * FROM someTable
WHERE MyField LIKE CONCAT('%,',_Number,',%');
END

and if your MyField doesn't start and end with a comma, you'll need to do more in the WERE clause
WHERE MyField LIKE CONCAT('%,',_Number,',%')
OR MyField LIKE CONCAT(_Number,',%')
OR MyField LIKE CONCAT('%,',_Number)




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LVL 28

Expert Comment

by:strickdd
ID: 36490225
These two can return false positives:

OR MyField LIKE CONCAT(_Number,',%')
OR MyField LIKE CONCAT('%,',_Number)

For example, if the number you are looking for is "100" and the data looks like:

100,1,10
1100,1,10
1,10,100
1,10,1001

The two statements will return true for all the records. If you don't start and end with a comma, then you will need this:

SELECT * FROM someTable
WHERE CONCAT(',', MyField, ',') LIKE CONCAT('%,',_Number,',%');

That will ensure no false positives.
0
 
LVL 8

Expert Comment

by:stalhw
ID: 36490334
@strickdd:
No they won't return false positive...
Try it, you'll see...

a LIKE without a % in the beginning means the string must start with that we are showing so
1100,1,10 wouldn't match
same for the ending
1,10,1001 wouldn't match either

I agree that
WHERE CONCAT(',', MyField, ',') LIKE CONCAT('%,',_Number,',%');
will work (and is simple),
but my queries wouldn't not produce false positive, you are wrong about that, try it:
SELECT 1 FROM sometable WHERE '1,10,1001' LIKE '%,100'
it will return nothing, so no false positive...

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LVL 28

Assisted Solution

by:strickdd
strickdd earned 200 total points
ID: 36490352
Ah, point taken. I misread the query thinking you left the "%" before the number.
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Author Closing Comment

by:basil365
ID: 36494168
Thanks to you both
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