Updating many to many table from temp table

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September 3rd, 2009, 05:40 AM

EliS

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Join Date: Sep 2009

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Stored Procedures - Updating many to many table from temp table

Hello,

I'm having a problem populating/altering many to many table with temp table I'm using.
For this matter i use 4 tables:
Table 1 - Coach's, Table 2 - Course Type, Table 3 - Courses of Coach's (many to many Table), Table 4 - tempCOC
I'm using the tempCOC for the GUI, it includes all the Courses types with additional check box.
So when a user UNcheck/check a box the db will be updated accordingly.

The problem occurs when i want to send the data from the temp table to the 'Courses of Coach's' table according to check box being checked/unchecked.

How do i update the table with the new data most efficiently?

Thanks for the help,
Eli.

September 3rd, 2009, 05:48 AM

sync_or_swim

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Hi, and welcome to the forums.

I'm afraid I dont really understand the problem, would it be possible to see some sample data and any relevant code.

Without really understanding the problem properly, the only suggestion I could make would be to delete all data from the [Courses of Coachs] table before reinstating it from the tempCOC table with the most recent data. I'm just really confused as to the purpose of the temp table?

September 3rd, 2009, 06:06 AM

EliS

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Thanks for the quick reply.

Data:
Coach's:
CoachID: 111 fName:Eli lName: S
CoachID: 222 fName:Mike lName: M
Course Type:
typeID:1 description:Boxing
typeID:2 description:Karate
Courses Of Coach's:
COCid:1 CoachID: 111 typeID:2
COCid:2 CoachID: 111 typeID:1
COCid:2 CoachID: 222 typeID:1

TempCOC
typeID:1 description:Boxing check:false
typeID:2 description:Karate check:false

The TempCOC is loaded for every coach now being updated, lets say I'm editing Mike Courses via GUI (ASP.NET) i want to c all the courses available and then check or uncheck the courses he can tutor.

eventually update the Courses Of Coach's accordingly to the check box being checked or unchecked.

I hope i explained it better this time

Thanks again.

September 22nd, 2009, 07:33 PM

gregory.owen@hp

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The tempCOC table is unnecessary--given a coach's ID number it can be built dynamically:

Code:

SELECT 
ct.typeID, Description, CASE ISNULL(COCid,0)>0 THEN 'True' ELSE 'False' END as [Check]
FROM
[Course Type] ct
LEFT JOIN [Courses of Coaches] coc
ON ct.typeID = coc.typeid
WHERE coc.CoachID = 111

When a new check box is checked, use insert:

Code:

INSERT INTO [Courses of Coaches] (CoachID, TypeID)
VALUES (@CoachID, @TypeID)

When you un-check, use delete:

Code:

DELETE FROM [Courses of Coaches]
WHERE coachID=@coachID AND TypeID = @TypeID

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