While loop for selecting field names? - mysql

Question

I have a nasty, nasty data layout that I am forced to work with. I finally got a working query using C# and a for loop executing the same query over and over but adjusting which fields are called, but now I am wondering if it is possible to do it with a while loop. I am getting an error, and I am not sure if it is because I am using Faircom / C-tree as the database, or if there is something wrong with my query. I am normally a Mysql user.
the table has 20 fields I care about and want to extract into a csv list. They are codetype1-codetype20 and I want it to be something like value1, value2, value3... where as it is now I get them all back one at a time. Trouble is that codetype1 is dependent on another field to determine where I go look for the info on that code, which is why the case statements.
DROP PROCEDURE IF EXISTS proc_loop_test;
CREATE PROCEDURE proc_loop_test()
SET #index = 1;
WHILE(#index < 21) DO
SELECT Replace(Concat(To_char(apptid), To_char(.#index) ), ' ', '') AS reference_id,
apptid AS a_reference_id,
CASE
WHEN c.ee > 0 THEN d.amt
ELSE insfee.amt
END AS amount,
CASE
WHEN c.ee > 0 THEN Rtrim(e.moneyname)
ELSE insname.namefeecatid
END AS moneyschedule_name,
CASE codetype#index
WHEN 1 THEN rtrim(a.descript)
ELSE rtrim(b.descript0)
END AS description,
CASE codetype#index
WHEN 1 THEN rtrim(a.abbrevdescript)
ELSE rtrim(b.abbrev0)
END AS abbreviated_description,
CASE codetype#index
WHEN 1 THEN rtrim(a.thiscode)
ELSE rtrim(b.thiscode0)
END AS code
FROM meetings
LEFT JOIN
(
SELECT admin.table2.procid,
admin.table2.this_code_id,
admin.v_table1.descript,
admin.v_table1.abbrevdescript,
admin.v_table1.thiscode
FROM admin.table2
INNER JOIN admin.v_table1
ON admin.table2.this_code_id = admin.v_table1.this_code_id) AS a
ON meetings.codeid#index = a.procid
LEFT JOIN
(
SELECT admin.v_table1.descript AS descript0,
admin.v_table1.abbrevdescript AS abbrev0,
admin.v_table1.thiscode AS thiscode0,
admin.v_table1.this_code_id
FROM admin.v_table1) AS b
ON meetings.codeid#index = b.this_code_id
LEFT JOIN
(
SELECT patid AS id,
ee
FROM admin.customer) AS c
ON meetings.patid = c.id
LEFT JOIN
(
SELECT this_code_id AS redid,
eecategoryid,
amt
FROM admin.eeule) AS d
ON c.ee = d.eecategoryid
AND d.redid = b.this_code_id
LEFT JOIN
(
SELECT eecategoryid AS namefeecatid,
moneyname
FROM admin.eeulenames) AS e
ON d.eecategoryid = e.namefeecatid
LEFT JOIN (SELECT pi.customer_id,
pi.primarykk_id AS picid,
pi.primarykk_name,
pi.first_name,
pi.last_name,
i.groupname,
i.ee
FROM admin.v_pir AS pi
LEFT JOIN admin.money AS i
ON pi.primarykk_id = i.insid) AS
ins
ON ins.customer_id = c.id
LEFT JOIN (SELECT this_code_id AS redid,
eecategoryid,
amt
FROM admin.eeule) AS insfee
ON ins.ee = insfee.eecategoryid
AND insfee.redid = b.this_code_id
LEFT JOIN (SELECT eecategoryid AS namefeecatid,
moneyname
FROM admin.eeulenames) AS insname
ON insfee.eecategoryid = insname.namefeecatid
WHERE codeid#index >= 1
END WHILE;
END;
I have never used a while loop, and while I understand somewhat I am supposed to select this to go INTO something, do I need to create a temp table, or can it all just be stored in memory till the end of the loop and returned.
For what it is worth, the entire SELECT query works in C# when you replace the #index with concatenating format " . index . "

Answer 1

Based on the information that you have provided, it is strongly suggested that you reach out to your vendor for this. You're attempting to create a stored procedure, however, using a mySQL proprietary syntax. Stored procedure support is unique to each database vendor. FairCom's c-treeACE SQL actually uses Java for cross platform support and .NET for Windows.
https://docs.faircom.com/doc/jspt/#cover.htm
Stored procedure development requires a strong knowledge of the database layout which is highly application dependent. In this case, many legacy application dependencies may be involved. Again, your best source of information will be your application vendor.