2 messages in com.mysql.lists.win32looping results of prepared statement...
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Joelle Tegwen18 Jan 2006 14:42 
Joelle Tegwen19 Jan 2006 06:05 
Subject:looping results of prepared statements in a function
From:Joelle Tegwen (tegw@umn.edu)
Date:01/18/2006 02:42:04 PM
List:com.mysql.lists.win32

After reading up on procedures and functions at http://dev.mysql.com/doc/refman/5.0/en/sqlps.html and http://mysql.gilfster.com/page.php?parent_id=1.3&page_id=1.3.6 for a couple of days I'm giving some stuff a shot.

What I need to be able to do is create a cursor dynamically. The documentation seems to suggest that in a procedure you need to use a prepared statement to do this, but then it's not clear how you loop it.

This is my function: DELIMITER $$

DROP FUNCTION IF EXISTS `youthhood`.`getTablePrimaryKey` $$ CREATE FUNCTION `youthhood`.`getTablePrimaryKey` (sSchema VARCHAR(100), sTable VARCHAR(100)) RETURNS VARCHAR(200) BEGIN declare bEndLoop int default 0; declare sKey, temp VARCHAR(200); declare continue handler for sqlstate '02000' set bEndLoop=1;

set @schema=sSchema; set @table=sTable;

set @sSql:= concat('SELECT *', 'FROM information_schema.TABLE_CONSTRAINTS T' 'WHERE table_schema=? AND constraint_type=PRIMARY KEY AND table_name=?'); prepare rs from @sSql; execute rs using @schema, @table;

repeat fetch rs into temp; if not bEndLoop then set sKey := concat(sKey, ", " temp) end if;

until bEndLoop end repeat;

deallocate prepare sSql;

if length(sKey)>0 then sKey:=right(sKey, length(sKey)-2)

return sKey END $$

DELIMITER ;

I just want to get a comma delimited string of the Primary Key fields (and in a similar function the indexes) for a given table. So if there is a better way to do this in general, I'm totally open to that too. I'm pretty sure I'm in totally over my head so any help would be much appreciated.

Thanks in advance. Joelle