how to use select case statement with sql transaction - tsql

Question

i have one crm application. i found query in my db implementation while staff user post reply of inquiry i have to insert new inquiry ans to one table and modify another table data same time. i applied logic of as well as i represent my stored proc. but error occured in this proc.
set ANSI_NULLS ON
set QUOTED_IDENTIFIER ON
GO
ALTER PROCEDURE [dbo].[InquiryPostReply]
(
#Inquiry_id VARCHAR(50),
#Priority_type VARCHAR(25),
#Status_name VARCHAR(50),
#Inquiry_Content VARCHAR(1024),
#NewId VARCHAR(50) OUT
)
AS
BEGIN
SET NOCOUNT ON;
declare #var1 int
declare #var2 int
declare #uniqueRef char(14)
set #uniqueRef = dbo.UniqueRefNum(rand(), rand(), rand(), rand())
set #var1= (SELECT [Id] FROM [OmStocks].[dbo].[tbl_Status_master] WHERE (Status_name=#Status_name))
set #var2= (SELECT [Id] FROM [OmStocks].[dbo].[tbl_Priority_master] WHERE (Priority_name=#Priority_type))
SELECT
CASE #Status_name
WHEN 'Open' THEN
BEGIN TRAN;
BEGIN TRY
INSERT INTO [OmStocks].[dbo].[tbl_Inquiry_master]
([Id],[Inquiry_id],[Priority_id],[Status_id],[Inquiry_Content],[TimeStamp])
VALUES
(#uniqueRef,#Inquiry_id,#var2,#var1,#Inquiry_Content,CONVERT(DATETIME,GETDATE(), 101))
UPDATE [OmStocks].[dbo].[tbl_Inquiry_History]
SET [Priority_id] = #var2,[Status_id] = #var1,[IsDisplay] = 1,[IsReplied] = 1,[TimeStamp] = CONVERT(DATETIME,GETDATE(), 101)
WHERE (Inquiry_id=#Inquiry_id)
COMMIT TRAN;
END TRY;
WHEN 'Close' THEN
BEGIN TRAN;
BEGIN TRY
INSERT INTO [OmStocks].[dbo].[tbl_Inquiry_master]
([Id],[Inquiry_id],[Priority_id],[Status_id],[Inquiry_Content],[TimeStamp])
VALUES
(#uniqueRef,#Inquiry_id,#var2,#var1,#Inquiry_Content,CONVERT(DATETIME,GETDATE(), 101))
UPDATE [OmStocks].[dbo].[tbl_Inquiry_History]
SET [Priority_id] = #var2,[Status_id] = #var1,[IsDisplay] = 0,[IsReplied] = 1,[TimeStamp] = CONVERT(DATETIME,GETDATE(), 101),[Activity_expire_time] = CONVERT(DATETIME,GETDATE(), 101)
WHERE (Inquiry_id=#Inquiry_id)
COMMIT TRAN;
END TRY;
END
SET #NewId = #uniqueRef
END
error occured like:
Msg 156, Level 15, State 1, Procedure InquiryPostReply, Line 21
Incorrect syntax near the keyword 'BEGIN'.
Msg 102, Level 15, State 1, Procedure InquiryPostReply, Line 31
Incorrect syntax near ';'.
Msg 102, Level 15, State 1, Procedure InquiryPostReply, Line 43
Incorrect syntax near ';'.
Msg 102, Level 15, State 1, Procedure InquiryPostReply, Line 46
Incorrect syntax near 'END'.
please help me...

Answer 1

You can't use CASE for this. CASE is an expression that returns a single result, not a statement that can be used for control-of-flow. I do understand that CASE is used that way in some other languages, but it's just not possible in T-SQL.
IF #Status_name = 'Open' THEN
BEGIN
-- do stuff
END
IF #Status_name = 'Close' THEN
BEGIN
-- do other stuff
END