I am trying to capture if my SQL Query have 0 rows or multiple rows. If it has 0 rows then I will insert, if 1 will perform an update, if > 1 will perform additional analysis.
Is there a way I can see if my query resulted in x results or no results in automation anywhere?
Any assistance will be appreciated.
You can make use of if exists and if not exists and check if rows exists or not, or even if there are multiple before doing the insert.
Here is a simple example using if not exists where if the row doesn't exist on dbo.Table it will insert a row. If it already exists then the ID will be logged to an Error table.
declare #InsertID int = 5, #Name nvarchar(max) = 'some name'
if ((select count(1) from dbo.Table where ID = #InsertID) > 1) -- detect error; more than one record for an id
begin
insert into dbo.Error (ErrorID, ErrorDate)
select #InsertID, getdate()
end
else if not exists (select 1 from dbo.Table where ID = #InsertID) -- no record exists for ID, insert it
begin
insert into dbo.Table (ID, Name)
select #InsertID, #Name
else if exists (select 1 from dbo.Table where ID = #InsertID) -- update the single record
begin
update dbo.Table set Name = #Name where ID = #InsertID
end
A2019 returns the results of a SQL Query as a table...
You could have an if statement right after your query which checks to see if the row count of the returned table is > 0 then take action accordingly.
Related
I am trying to Insert data in a table named "Candidate_Post_Info_Table_ChangeLogs" whenever a record is updated in another table named "Candidate_Personal_Info_Table". my code works fine whenever a single record is updated but when i try to updated multiple rows it gives error:
"Sub query returned more then 1 value".
Following is my code :
ALTER TRIGGER [dbo].[Candidate_PostInfo_UPDATE]
ON [dbo].[Candidate_Post_Info_Table]
AFTER UPDATE
AS
BEGIN
IF ##ROWCOUNT = 0
RETURN
DECLARE #Candidate_Post_ID int
DECLARE #Candidate_ID varchar(50)
DECLARE #Action VARCHAR(50)
DECLARE #OldValue VARCHAR(MAX)
DECLARE #NewValue VARCHAR(MAX)
DECLARE #Admin_id int
IF UPDATE(Verified)
BEGIN
SET #Action = 'Changed Verification Status'
SET #Candidate_Post_ID = (Select ID From inserted)
SET #Candidate_ID = (Select Identity_Number from inserted)
SET #NewValue = (Select Verified From inserted)
SET #OldValue = (Select Verified From deleted)
IF(#NewValue != #OldValue)
BEGIN
INSERT INTO Candidate_Post_Info_Table_ChangeLogs(Candidate_Post_ID, Candidate_ID, Change_DateTime, action, NewValue, OldValue, Admin_ID)
VALUES(#Candidate_Post_ID, #Candidate_ID, GETDATE(), #Action, #NewValue, #OldValue, '1')
END
END
END
i have searched stack overflow for this issue but couldn't get any related answer specific to this scenario.
When you insert/update multiple rows into a table, the Inserted temporary table used by the system holds all of the values from all of the rows that were inserted or updated.
Therefore, if you do an update to 6 rows, the Inserted table will also have 6 rows, and doing something like this:
SET #Candidate_Post_ID = (Select ID From inserted)
Will return an error, just the same as doing this:
SET #Candidate_Post_ID = (SELECT 1 UNION ALL SELECT 2 UNION ALL SELECT 3 UNION ALL SELECT 4 UNION ALL SELECT 5 UNION ALL SELECT 6)
From the looks of things, you tried to do this with an iterative approach. Set-based is better. Maybe consider doing it like this in the body of your TRIGGER (without all of the parameters...):
IF UPDATE(Verified)
BEGIN
INSERT INTO Candidate_Post_Info_Table_ChangeLogs
(
Candidate_Post_ID
,Candidate_ID
,Change_DateTime
,action
,NewValue
,OldValue
,Admin_ID
)
SELECT
I.ID
,I.Identity_Number
,GETDATE()
,'Changed Verification Status'
,I.Verified
,O.Verified
,'1'
FROM Inserted I
INNER JOIN Deleted O
ON I.ID = O.ID -- Check this condition to make sure it's a unique join per row
WHERE I.Verified <> O.Verified
END
A similar case was solved in the following thread using cursors.... please check it
SQL Server A trigger to work on multiple row inserts
Also the below thread gives the solution based on set based approach
SQL Server - Rewrite trigger to avoid cursor based approach
*Both the above threads are from stack overflow...
We are using the following trigger in SQL Server to maintain the history now I need to identify the operations just like insert,update or delete. I found some information HERE but it doesn't works with the SQL Server.
CREATE TRIGGER audit_guest_details ON [PMS].[GSDTLTBL]
FOR INSERT,UPDATE,DELETE
AS
DECLARE #SRLNUB1 INT;
DECLARE #UPDFLG1 DECIMAL(3,0);
SELECT #SRLNUB1 = I.SRLNUB FROM inserted I;
SELECT #UPDFLG1 = I.UPDFLG FROM inserted I;
BEGIN
/* Here I need to identify the operation and insert the operation type in the GUEST_ADT 3rd field */
insert into dbo.GUEST_ADT values(#SRLNUB1,#UPDFLG1,?);
PRINT 'BEFORE INSERT trigger fired.'
END;
GO
But here I need to identify the operation and want to insert operation type accordingly.
Here I don't want to create three trigger for every operations
For Inserted : Rows are in inserted only.
For Updated: Rows are in inserted and deleted.
For Deleted: Rows are in deleted only.
DECLARE #event_type varchar(42)
IF EXISTS(SELECT * FROM inserted)
IF EXISTS(SELECT * FROM deleted)
SELECT #event_type = 'update'
ELSE
SELECT #event_type = 'insert'
ELSE
IF EXISTS(SELECT * FROM deleted)
SELECT #event_type = 'delete'
ELSE
--no rows affected - cannot determine event
SELECT #event_type = 'unknown'
This is a simplified version of Mikhail's answer that uses a searched CASE expression.
DECLARE #Operation varchar(7) =
CASE WHEN EXISTS(SELECT * FROM inserted) AND EXISTS(SELECT * FROM deleted)
THEN 'Update'
WHEN EXISTS(SELECT * FROM inserted)
THEN 'Insert'
WHEN EXISTS(SELECT * FROM deleted)
THEN 'Delete'
ELSE
NULL --Unknown
END;
Since you can get multiple rows at once we do it as follows.
INSERT INTO Log_Table
(
LogDate
,LogAction
-- your field list here
,Field0
-- Example : Tracking new and old value for a specific field
-- Make sure that the [Field1_Old] is nullable or has a default value
,Field1,Field1_Old
)
SELECT
LogDate=GETDATE()
,LogAction = CASE WHEN d.[PK_Field] IS NULL THEN 'I' ELSE 'U' END
,i.Field0
,i.Field1, d.Field1
FROM inserted i
LEFT JOIN deleted d on i.[PK_Field]=d.[PK_Field]
WHERE i.[PK_Field] IS NOT NULL
INSERT INTO Log_Table
(
LogDate
,LogAction
-- your field list here
,Field0
-- Example : Tracking new and old value for a specific field
-- Make sure that the [Field1_Old] is nullable or has a default value
,Field1,Field1_Old
)
SELECT
LogDate=GETDATE()
,LogAction = 'D'
,d.Field0
,d.Field1, NULL
FROM deleted d
LEFT JOIN inserted i on i.[PK_Field]=d.[PK_Field]
WHERE i.[PK_Field] IS NULL
create trigger my_trigger on my_table
after update , delete , insert
as
declare #inserting bit
declare #deleting bit
declare #updating bit = 0
select #inserting = coalesce (max(1),0) where exists (select 1 from inserted)
select #deleting = coalesce (max(1),0) where exists (select 1 from deleted )
select #inserting = 0
, #deleting = 0
, #updating = 1
where #inserting = 1 and #deleting = 1
print 'Inserting = ' + ltrim (#inserting)
+ ', Deleting = ' + ltrim (#deleting)
+ ', Updating = ' + ltrim (#updating)
If all three are zero, there are no rows affected and I think there is no way to tell whether it is an update/delete/insert.
I'd like to use a return from a procedure in a CASE statement. It can't be a function because that procedure returns an inserted key.
UPDATE TIM
SET CD_LINHA_EVENTO =
CASE WHEN
TIM.CD_SUBESTRUTURA_PARAMETRO = (SELECT TOP 1 SPZ.CD_SUBESTRUTURA_PARAMETRO FROM SUBESTRUTURA_PARAMETRO SPZ WITH (NOLOCK) WHERE SPZ.CD_SUBESTRUTURA = TIM.CD_SUBESTRUTURA
AND SPZ.FL_SELECAO = 1 ORDER BY SPZ.NR_ORDEM)
THEN
**EXEC [dbo].[SPRTO_NumeracaoEventos]**
ELSE
(SELECT MAX(TIM2.CD_LINHA_EVENTO) FROM #TB_INSERTED_MODIFIED TIM2 WITH(NOLOCK))
END
FROM #TB_INSERTED_MODIFIED TIM WITH (NOLOCK)
stored procedure [SPRTO_NumeracaoEventos]:
INSERT INTO TB_NUMERACAO_EVENTOS (VALOR) VALUES ('')
RETURN SCOPE_IDENTITY()
Thank you!
I wasn't able to figure out your table schema well enough to provide a direct answer, but I put together a way to use inserted identity values within an update trigger. Hopefully you can adapt this to fit your specific use case.
Have a look at this SQL Fiddle
As noted in the comments in the fiddle, this strategy is based on using the OUTPUT clause to capture identity values into a table variable. See http://msdn.microsoft.com/en-us/library/ms177564.aspx for more on the OUTPUT clause.
For rows where the case is true, we insert one row per true case into the secondary table and capture the identities to a table variable, then we update the underlying table with a row number join between the inserted virtual table and the identity table variable. Then we run another update for the rows where the case is false. Here's the relevant trigger code from my fiddle example.
-- Create a table variable to hold identity ID values from OUTPUT clause
DECLARE #table_2_ids TABLE (id INT NOT NULL)
-- Insert to our secondary table where the condition is true and capture the identity values to table variable
INSERT table_2 (textval)
OUTPUT inserted.id INTO #table_2_ids
SELECT 'from trigger'
FROM inserted
WHERE flag = 1
-- Use row number to match up rows from inserted where the condition is true to the identity value table variable
-- Update matched identity id to underlying table
UPDATE t
SET table_2_id = r.id, textval = textval + ' and trigger inserted to table_2'
FROM table_1 t
JOIN (SELECT id, ROW_NUMBER() OVER (ORDER BY id) rn FROM inserted WHERE flag = 1) i ON i.id = t.id
JOIN (SELECT id, ROW_NUMBER() OVER (ORDER BY id) rn FROM #table_2_ids) r ON r.rn = i.rn
-- and now update where condition is false
UPDATE t
SET textval = textval + ' and trigger did not insert to table_2'
FROM table_1 t
WHERE flag = 0
I have a collection of rows that I get from a web service. Some of these rows are to be inserted, some are updates to existing rows. There is no way of telling unless I do a query for the ID in the table. If I find it, then update. If I don't, then insert.
Select #ID from tbl1 where ID = #ID
IF ##ROWCOUNT = 0
BEGIN
Insert into tbl1
values(1, 'AAAA', 'BBBB', 'CCCC', 'DDD')
END
ELSE
BEGIN
UPDATE tbl1
SET
A = #AAA,
B = #BBB,
C = #CCC,
D = #DDD
WHERE ID = #ID
END
I am trying to figure out the most effient way to update/insert these rows into the table without passing them into a stored procedure one at a time.
UPDATE 1
I should have mentioned I am using SQL Server 2005. Also if I have 300 records I don't want to make 300 stored procedure calls.
the most efficient way will be first try to update the table if it returns 0 row updated then only do insertion. for ex.
UPDATE tbl1
SET
A = #AAA,
B = #BBB,
C = #CCC,
D = #DDD
WHERE ID = #ID
IF ##ROWCOUNT = 0
BEGIN
Insert into tbl1
values(1, 'AAAA', 'BBBB', 'CCCC', 'DDD')
END
ELSE
BEGIN
END
Instead of paying for a seek first and then updating using another seek, just go ahead and try to update. If the update doesn't find any rows, you've still only paid for one seek, and didn't have to raise an exception, but you know that you can insert.
UPDATE dbo.tbl1 SET
A = #AAA,
B = #BBB,
C = #CCC,
D = #DDD
WHERE ID = #ID;
IF ##ROWCOUNT = 0
BEGIN
INSERT dbo.tbl1(ID,A,B,C,D)
VALUES(#ID,#AAA,#BBB,#CCC,#DDD);
END
You can also look at MERGE but I shy away from this because (a) the syntax is daunting and (b) there have been many bugs and several of them are still unresolved.
And of course instead of doing this one #ID at a time, you should use a table-valued parameter.
CREATE TYPE dbo.tbl1_type AS TABLE
(
ID INT UNIQUE,
A <datatype>,
B <datatype>,
C <datatype>,
D <datatype>
);
Now your stored procedure can look like this:
CREATE PROCEDURE dbo.tbl1_Update
#List AS dbo.tbl1_type READONLY
AS
BEGIN
SET NOCOUNT ON;
UPDATE t
SET A = i.A, B = i.B, C = i.C, D = i.D
FROM dbo.tbl1 AS t
INNER JOIN #List AS i
ON t.ID = i.ID;
INSERT dbo.tbl1
SELECT ID, A, B, C, D
FROM #List AS i
WHERE NOT EXISTS
(
SELECT 1
FROM dbo.tbl1 WHERE ID = i.ID
);
END
GO
Now you can just pass your DataTable or other collection from C# directly into the procedure as a single parameter.
From the collection of rows you get from the server find out which ones are already there:
select #id from tbl1 where id in (....)
Then you have a list of ids that are in the table and one that there are not in the table.
You will have then 2 batch operations: one for update, the other for insert.
what i understand is this :
at the front end u issue a single sql statement
ArrayofIDsforInsert = select ID from tbl1 where ID not in ( array of ids at the front end)
ArrayofIDsforUpdate = (IntialArrayofids at frontend) - (ArrayofIdsforInsert)
one insert into table and one update table...
now call the insert into table with ArrayofIds for insert
call the update table with ArrayofIds for update..
I want to create a stored procedure that performs insert or update operation on a column if
that column does not contains a value that already exists in database it should allow insert when COUNT(field) = 0 or update when COUNT(field)=0 or 1 And I should know that either of these operation is performed or not.
Please solve my problem using COUNT not Exists because that won't work for UPDATE.
I am working in ASP.net - I have two columns of a table that are needed to be kept unique without using the unique constraint. So I want a procedure like this:
create proc usp_checkall #field1 varchar(20),
#field2 varchar(20),
#ID int,
#count int output
Now your query on updating/inserting #field1 & #field2 on basis of #id
If you happen to have SQL Server 2008, you could also try:
MERGE dbo.SomeTable AS target
USING (SELECT #ID, #Field_1, #Field_2) AS source (ID, Field_1, Field_2)
ON (target.ID = source.ID)
WHEN MATCHED THEN
UPDATE SET Field_1 = source.Field_1, Field_2 = source.Field_2
WHEN NOT MATCHED THEN
INSERT (ID, Field_1, Field_2)
VALUES (source.ID, source.Field_1, source.Field_2)
Use:
INSERT INTO your_table
(column)
VALUES
([ your_value ])
WHERE NOT EXISTS (SELECT NULL
FROM your_table
WHERE t.column = [ your_value ])
That will work on SQL Server, MySQL, Oracle, Postgres. All that's needed is to use the db appropriate variable reference. IE: For MySQL & SQL Server:
INSERT INTO your_table
(column)
VALUES
( #your_value )
WHERE NOT EXISTS (SELECT NULL
FROM your_table
WHERE t.column = #your_value)
To see if anything was inserted, get the value based on ##ROWCOUNT if using SQL Server. Use SQL%ROWCOUNT if you are using Oracle.
if Exists select * from Yourtable WHere Your Criteria
begin
update ...
end
else
begin
insert ...
end
This kind of approach will do the trick. #AlreadyExisted could be an OUTPUT parameter on the sproc for your calling code to check once it's returned.
DECLARE #AlreadyExisted BIT
SET #AlreadyExisted = 0
IF EXISTS(SELECT * FROM YourTable WHERE YourField = #FieldValue)
BEGIN
-- Record already exists
SET #AlreadyExisted = 1
UPDATE YourTable
SET....
WHERE YourField = #FieldValue
END
ELSE
BEGIN
-- Record does not already exist
INSERT YourTable (YourField,....) VALUES (#FieldValue,.....)
END