Stored procedure to update or insert - sql-server

Question

I am new to stored procedure and managed to google, to create a stored procedure for inserting or updating the database. The set of records are selected from the Oracle Database and depending on the em_id it hase to be iserted or updated in to the Sql Database table using BizTalk
Trying to create a stored procedure to insert or update records depending on a field.
CREATE PROCEDURE [dbo].[usp_InsertorUpdateDB]
#dp_id char(32),
#dv_id char(32),
#em_number char(12),
#email varchar(50),
#emergency_relation char(32),
#option1 char(16),
#status char(20),
#em_id char(35),
#em_title varchar(64),
#date_hired datetime
AS
MERGE [dbo].[em] AS [Target]
USING (SELECT #dp_id, #dv_id , #em_number, #email, #emergency_relation, #option1, #status, #em_id, #em_title, #date_hired)
AS [Source] ([dp_id], [dv_id], [em_number], [email], [emergency_relation], [option1], [status], [em_id], [em_title], [date_hired])
ON [Target].[em_id] = [Source].[em_id]
WHEN MATCHED THEN
UPDATE SET [dp_id] = [Source].[dp_id],
[dv_id] = [Source].[dv_id],
[em_number] = [Source].[em_number],
[email] = [Source].[email],
[emergency_relation] = [Source].[emergency_relation],
[option1] = [Source].[option1],
[status] = [Source].[status],
[em_id] = [Source].[em_id],
[em_title] = [Source].[em_title],
[date_hired] = [Source].[date_hired]
WHEN NOT MATCHED THEN
INSERT ([dp_id], [dv_id], [em_number], [email], [emergency_relation], [option1], [status], [em_id], [em_title],[date_hired])
VALUES ([Source].[dp_id], [Source].[dv_id], [Source].[em_number], [Source].[email], [Source].[emergency_relation], [Source].[option1], [Source].[status], [Source].[em_id], [Source].[em_title], [Source].[date_hired]);
GO
I asked a question two days before because it was showing
Incorrect syntax near the keyword 'WHEN'.
There was a comment showing the code is prone deadlock. Since I am new to Stored Procedures I dont know how to create a stored procedure for insert or update without deadlocks.I am really stuck.

Answer 1

Merge is the reason for deadlock, you can simply try that
CREATE PROCEDURE [dbo].[usp_InsertorUpdateDB]
#dp_id char(32),
#dv_id char(32),
#em_number char(12),
#email varchar(50),
#emergency_relation char(32),
#option1 char(16),
#status char(20),
#em_id char(35),
#em_title varchar(64),
#date_hired datetime
AS
IF ( (SELECT COUNT(em_id) FROM [dbo].[em] WHERE em_id = #em_id) > 0)
UPDATE [dbo].[em]
SET
[dp_id] = #dp_id,
[dv_id] = #dv_id,
[em_number] = #em_number,
[email] = #email,
[emergency_relation] = #emergency_relation,
[option1] = #option1,
[status] = #status,
[em_id] = #em_id,
[em_title] = #em_title,
[date_hired] = #date_hired
WHERE em_id = #em_id
ELSE
INSERT INTO [dbo].[em] (dp_id, dv_id, em_number, email, emergency_relation, option1, [status], em_id, em_title,date_hired)
VALUES (#dp_id, #dv_id, #em_number, #email, #emergency_relation, #option1, #status, #em_id, #em_title, #date_hired);
GO