问题
I have a case in which I have SQL code with an IF-ELSE block. The code in the IF portion should not be reached, but I still get an error when the SQL executes. In the code I first test for the linked server, and when that fails, @reval
is set to 1 and the ELSE
block should execute and avoid the code in the IF
block that needs to query the linked server, but I get this error:
Msg -1, Level 16, State 1, Line 0
SQL Server Network Interfaces: Error Locating Server/Instance Specified [xFFFFFFFF].
I am running the query from within SSMS 2012. Why does this error occur?
declare @clientCode VARCHAR(7)
set @clientCode = '8001299'
declare @year INT
set @year = 2013
DECLARE @retVal INT
-- test connectivity with linked database server
BEGIN TRY
EXEC @retVal = sys.sp_testlinkedserver N'ATLAS'
END TRY
BEGIN CATCH
SET @retval = SIGN(@@ERROR)
END CATCH
IF @retval = 0 -- connection attempt successful
BEGIN
--THE FOLLOWING INSERT SQL STATEMENT CAUSES THE ERROR
SET @contIndex = (SELECT ContIndex FROM ATLAS.Engine_sp.dbo.tblEngagement WHERE ClientCode = @clientCode)
END
ELSE -- could not connect
BEGIN
-- execute code to pull from linked server
END
回答1:
It'll still parse and bind everything before it executes it. It's failing to bind here.
You could use sp_executesql
to execute that line, and it should only validate when sp_executesql
is actually called.
来源:https://stackoverflow.com/questions/21323075/sql-if-block-code-causing-error-even-though-it-shouldnt-execute