If Exists Update Else Insert with VB.net (sql parameterised query)

Question

I\'m hoping to use the following update\\insert method to speed up my application insert\\updates:

UPDATE [Application_Type_Table] 
SET ApplicationType=\'Test Va         


        

Answer 1

sqlCommand.CommandText = "IF NOT EXISTS (SELECT 1 FROM  [Application_Type_Table] WHERE "_
"ID='1') BEGIN INSERT INTO " _
"[Application_Type_Table] VALUES ('Test Value') END ELSE BEGIN UPDATE [Application_Type_Table]"_
"SET ApplicationType='Test Value'"_
"WHERE ID='1' END"

Answer 2

I would suggest moving the query to a stored procedure. Queries (especially multi-statement ones) don't really belong hard-coded into one's application IMO. Doing so would also have the bonus of alleviating your problem ;)

Answer 3

This pattern is known as an UPSERT. The modern way of doing this is to use MERGE in SQL Server 2008 e.g.

MERGE INTO Application_Type_Table AS target 
USING (
       VALUES (@RecordID, @TestValue)
      )  AS source (ID, ApplicationType)
   ON target.ID = source.ID
WHEN MATCHED 
   THEN UPDATE 
           SET ApplicationType = source.ApplicationType
WHEN NOT MATCHED 
   THEN INSERT (ID, ApplicationType) 
           VALUES (ID, ApplicationType);