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Help with possible infinite looping triggers

Posted on 2008-06-09
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Last Modified: 2008-06-16
Hi,

I have 2 store databases (retail & wholesale), each database contains the same tables and structure but most with different data. There are several tables that will contain the same information such as products, productOptions, categories, etc.

I have two seperate web apps for updating each database. Each page contains several forms for updating the various tables and submits to an execute page that carries out the updates.

I have created (with help from expert SIMONET) a trigger that will update/insert/delete the wholesale database after the retail one has been updated thru the web app.

Everything works great until I try to create the same type of triggers for the wholesale database (to perform the updates on the retail database).

I think I have created a infinite loop of triggers. I am not really sure because the error is:

 [DBNETLIB][ConnectionRead (recv()).]General network error. Check your network documentation.

But it seems logical that the trigger are acting on each other.

Can anyone help to solve this situation? Here is the trigger code:
USE [jcpascu_retailDEV]
GO
 
create trigger [jcpascu_admin].[tr_products]
   on [jcpascu_admin].[products]
   after Insert,Update,Delete
as
 
begin
  
   declare @InsertedCount int
   declare @DeletedCount int
   set @InsertedCount = (select count(*) from inserted)
   set @DeletedCount = (select count(*) from deleted)
 
   if @InsertedCount > 0 begin
      -- first do updated rows
      if @DeletedCount > 0 begin
         update [jcpascu_wholesaleDEV].[jcpascu_admin].[products]
           set price = A.price,
           noShipCharge = A.noShipCharge,
           fileName = A.fileName,
           homepage = A.homepage,
           smallImageUrl = A.smallImageUrl,
           listPrice = A.listPrice,
           sku = A.sku,
           relatedKeys = A.relatedKeys,
           details = A.details,
           descriptionLong = A.descriptionLong,
           description = A.description,
           imageUrl = A.imageUrl,
           reviewAllow = A.reviewAllow,
           stock = A.stock,
           weight = A.weight,
           reviewAutoActive = A.reviewAutoActive,
           refurbished = A.refurbished,
           msrp = A.msrp,
           handlingfee = A.handlingfee,
           AltImageURL = A.AltImageURL,
           Freight = A.Freight,
           active = A.active,
           supplier = A.supplier,
           sortOrder = A.sortOrder,
           taxExempt = A.taxExempt,
           UPC = A.UPC,
           minqty = A.minqty,
           idBrand = A.idBrand,
           hotDeal = A.hotDeal,
           idManufacturer = A.idManufacturer,
           mpn = A.mpn,
           wholesaleprice = A.wholesaleprice,
           map = A.map,
           estimatedship = A.estimatedship,
           XLrgImageURL = A.XLrgImageURL
         FROM Inserted A
         WHERE A.idProduct in (select [idProduct] from deleted) and ([jcpascu_wholesaleDEV].[jcpascu_admin].[products].idProduct = A.idProduct)
      end
      else
      begin
          -- now do inserted rows
          SET IDENTITY_INSERT [jcpascu_wholesaleDEV].[jcpascu_admin].[products] ON
          INSERT INTO [jcpascu_wholesaleDEV].[jcpascu_admin].[products]
           ([idProduct],price,noShipCharge,fileName,homepage,
           smallImageUrl,listPrice,sku,relatedKeys,
           details,descriptionLong,description,imageUrl,
           reviewAllow,stock,weight,reviewAutoActive,
           refurbished,msrp,handlingfee,AltImageURL,Freight,
           active,supplier,sortOrder,taxExempt,UPC,minqty,
           idBrand,hotDeal,idManufacturer,mpn,
           wholesaleprice,map,estimatedship,XLrgImageURL)
           select [idProduct],price,noShipCharge,fileName,homepage,
           smallImageUrl,listPrice,sku,relatedKeys,
           details,descriptionLong,description,imageUrl,
           reviewAllow,stock,weight,reviewAutoActive,
           refurbished,msrp,handlingfee,AltImageURL,Freight,
           active,supplier,sortOrder,taxExempt,UPC,minqty,
           idBrand,hotDeal,idManufacturer,mpn,
           wholesaleprice,map,estimatedship,XLrgImageURL
          FROM Inserted
          SET IDENTITY_INSERT [jcpascu_wholesaleDEV].[jcpascu_admin].[products] OFF
      end
 end
    else
          -- now do deleted rows
          if @DeletedCount > 0  begin
            DELETE FROM [jcpascu_wholesaleDEV].[jcpascu_admin].[products] 
            WHERE idProduct IN (SELECT idProduct FROM deleted)
          end
end

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Question by:ChristinaPupo
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Expert Comment

by:sqlconsumer
ID: 21749352
Do you have the code for the trigger on the Wholesale database? or is it exactly the same? appart from the database scope.

What you have describe is indirect recursion also referred to as nested triggers.

By setting the NESTED TRIGGERS option to 0 at the server level, you can disable all forms of nested trigger.
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Author Comment

by:ChristinaPupo
ID: 21757837
The code for the wholesale triggers are the same except that they update the retail database instead. I don't think I have the option of changing the nested triggers option to 0 because I am on a shared SQL server and do not have access to most of the settings. Can you elaborate on how to do this so I can be sure? Isn't there any way of changing the trigger code to not act on each other? I have tried some variations of code using IF THEN statements and/or IF NOT UPDATE but these are the first triggers I've ever worked with and can't seem to get anything to work

You help is greatly appreciated..
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Accepted Solution

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sqlconsumer earned 500 total points
ID: 21767450
sp_configure 'nested trigers', 0;
GO

Will turn off nested triggers.

The alternative is to create a third table that has a trigger. When records are added to this table you can decide whether to apply the new record to the wholesale and retail tables.

Hope this helps
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