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HomeHomeDevelopment and...Development and...Building ExtensionsBuilding ExtensionsModulesModulesDAL2 - Escaping @ symbol in @@ROWCOUNT and similarDAL2 - Escaping @ symbol in @@ROWCOUNT and similar
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6/14/2017 2:01 PM
 

I am having a bit of trouble with updating data with my DAL2 module.

I have the following, very simple code which will update or insert a row into a table:

                    var sb = new StringBuilder();

                    sb.Append("UPDATE Tab_Categories SET CategoryId = @1 WHERE TabId = @0");

                    sb.Append(" IF @@ROWCOUNT = 0");

                    sb.Append(" INSERT INTO Tab_Categories (TabId, CategoryId) VALUES (@0, @1)");

                    db.Execute(System.Data.CommandType.Text, sb.ToString(), new object[] { tabId, catId, });

But when the code runs my catch block logs the following: Must declare the scalar variable "@ROWCOUNT".

Which clearly means I need to escape the @ symbol in @@ROWCOUNT.

 

How do you normally work around the issue? Is it even possible?

 

I had a similar issue when trying to call a stored procedure with named parameter list in a similar fashion. Luckily I was able to get away with string.Format() by providing the list of values in the correct order. But I do not have the luxury of doing so this time.

Just in case, I know that in the name of good practice I should define an entity model and a controller and use those for CRUD operations but I really do not want to do that at this point in time.

 
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6/20/2017 6:57 AM
 
Well, it turns out simpler than I thought. Prepend any parameter or function with @ symbol to escape it (e.g. @@@ROWCOUNT or @@param1).

I am told PetaPoco.cs file uses the same technique to escape functions:

db.ExecuteNonQueryHelper(cmd);
return db.ExecuteScalar
 
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