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Cursor cannot explicitly SELECT more than one item of different type
Posted by: Greg Dougherty
Date: October 02, 2007 07:16PM

Hi,

Just spent way too many hours tracking down this bug.

MySQL 5.0.41, Mac OS/X 10.4.10
Table with two fields:
CREATE TABLE tempSets (
gene VARCHAR(30) NOT NULL,
value DOUBLE PRECISION NULL DEFAULT NULL)
ENGINE = MyISAM;

In a stored procedure, had the following line:
DECLARE tempCursor CURSOR FOR SELECT gene, value FROM tempSets;

later had this line:
FETCH tempCursor INTO geneName, value;

FETCH did NOT work. It would put the correct value into geneName, and NULL into value. I reversed the order of the fields. It still put correct value into geneName, and NULL into value. Changing the DECLARE to
DECLARE tempCursor CURSOR FOR SELECT * FROM tempSets;
Made everything work.

This should be fixed. If not fixed, it at least should be documented.

Greg

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