Obtaining the value of certain columns in a SQL database
I have created the following trigger that inserts data into a SQL table when a specific column is updated. I would also like to obtain the current value of certain columns of the updated row. To do this, I've been using the INSERT command, but I keep receiving NULL values in return. This is the code:
CREATE TABLE [Main] (
[USerial] varchar(10) NOT NULL,
[Status] varchar(10) NULL)
ON [PRIMARY];
CREATE TRIGGER [Status_Notification] ON [Main] WITH EXECUTE AS CALLER AFTER UPDATE AS if update(status)
SET NOCOUNT ON
declare @xml_value xml
declare @P_number varchar(10)
declare @status varchar(10)
-- Select data and build XML
set @pnr_number = (select d.userial from main m inner join deleted d on m.userial = d.userial) set @xml_value = '<MAIN><Number>333</Number><Status>Cancel</Status></MAIN>'
-- Insert an entry into the table
insert into q_out
(bi,bo,xml,mid,pnr_nr, msg_status)
values
('a',
'b',
@xml_value,
1,
@pnr_number,
'N');
GO
Do you have any idea why this is happening?
Software/Hardware used:
Software/Hardware used:
ASKED:
November 10, 2008 7:27 PM
UPDATED:
November 10, 2008 10:52 PM
Answer Wiki:
The first thing that I notice is that you have an the IF UPDATE(STATUS) at the top, but with no BEGIN END statements. This means that only the line directly under the IF command is what happens if the IF is valid. In this case that is the SET NOCOUNT ON.
You would be better off writing the trigger like this so that the trigger can handle more than one record being processed at a time.
<pre>CREATE TRIGGER [Status_Notification] ON [Main]
WITH EXECUTE AS CALLER
AFTER UPDATE AS
if update(status)
BEGIN
SET NOCOUNT ON
declare @xml_value xml
-- Select data and build XML
set @xml_value = '<MAIN><Number>333</Number><Status>Cancel</Status></MAIN>'
-- Insert an entry into the table
insert into q_out
(bi,bo,xml,mid,pnr_nr, msg_status)
SELECT 'a', 'b', @xml_value, 1, userial, 'N'
FROM deleted
END
GO</pre>
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