I have 2 databases. One, named Test, has a table named Vehicles. Another, named Test2 has a table named Clients.
When I insert a new record on the Vehicles table in Test, I need to update the NumVehicles field on the Clients table in Test2.
Is this possible using triggers?
You need something like
USE Test;
GO
CREATE TRIGGER afterVehicleInsert ON Vehicles AFTER INSERT
AS
BEGIN
IF ##rowcount = 0 RETURN;
UPDATE Test2.[schema_name(default schema is dbo)].Clients
SET NumVehicles = NumVehicles +1 -- or whatever it should be
FROM Test2.[schema_name(default schema is dbo)].Clients c
INNER JOIN inserted i ON ([your join condition])
END;
GO
The only difference between updating the table in current and another db is that you need to refer a "remote" table using [db_name].[schema_name].[table_name]
This is working code is given below
USE BioStar;
GO
CREATE TRIGGER trgAfterInsertnew ON [dbo].[TB_EVENT_LOG]
FOR INSERT
AS
declare #nDateTime int;
declare #nReaderIdn int;
declare #nEventIdn int;
declare #nUserID int;
declare #nIsLog smallint;
declare #nTNAEvent smallint;
declare #nIsUseTA smallint;
declare #nType smallint;
select #nDateTime=i.nDateTime from inserted i;
select #nDateTime=i.nReaderIdn from inserted i;
select #nEventIdn=i.nEventIdn from inserted i;
select #nUserID=i.nUserID from inserted i;
select #nIsLog=i.nIsLog from inserted i;
select #nTNAEvent=i.nTNAEvent from inserted i;
select #nIsUseTA=i.nIsUseTA from inserted i;
select #nType=i.nType from inserted i;
insert into [HRM].dbo.Device_Data
(nDateTime,nReaderIdn,nEventIdn,nUserID,nIsLog,nTNAEvent,nIsUseTA,nType)
values(#nDateTime,#nDateTime,#nEventIdn,#nUserID,#nIsLog,#nTNAEvent,#nIsUseTA,#nType);
--set #audit_action='Inserted Record -- After Insert Trigger.';
PRINT 'AFTER DELETE TRIGGER fired.'
GO
Related
I'm trying to load some data from CSV using the postgresql COPY command. The trick is that I'd like to implement multi-tenancy on a userid (which is contained in the CSV). Is there an easy way to tell the postgres copy command to filter based on this userid when loading the csv?
i.e. all rows with userid=x go to schema=x, rows with userid=y go to schema=y.
There is not a way of doing this with just the COPY command, but you could copy all your data into a master table, and then put together a simple PL/PGSQL function that does this for you. Something like this -
CREATE OR REPLACE FUNCTION public.spike()
RETURNS void AS
$BODY$
DECLARE
user_id integer;
destination_schema text;
BEGIN
FOR user_id IN SELECT userid FROM master_table GROUP BY userid LOOP
CASE user_id
WHEN 1 THEN
destination_schema := 'foo';
WHEN 2 THEN
destination_schema := 'bar';
ELSE
destination_schema := 'baz';
END CASE;
EXECUTE 'INSERT INTO '|| destination_schema ||'.my_table SELECT * FROM master_table WHERE userid=$1' USING user_id;
-- EXECUTE 'DELETE FROM master_table WHERE userid=$1' USING user_id;
END LOOP;
TRUNCATE TABLE master_table;
RETURN;
END;
$BODY$
LANGUAGE 'plpgsql' VOLATILE
COST 100;
This gets all unique user_ids from the master_table, uses a CASE statement to determine the destination schema, and then executes an INSERT SELECT to move rows, and finally deletes the moved rows.
Hi all I try to get a row form my select statemnt in a trigger but I got this error unexpected token: R
CREATE TRIGGER PUBLIC.TRIGGERNAME AFTER UPDATE ON PUBLIC.CLIENTE_OFFERENTE
REFERENCING NEW ROW AS NUOVO
FOR EACH ROW
BEGIN ATOMIC
DECLARE r RECORD;
SET r=(SELECT offerta.IDIMMOBILE as ID, immobile.prezzomax as costo FROM PUBLIC.OFFERTA join immobile on immobile.idImmobile=offerta.idImmobile WHERE IDOFFERTA=NUOVO.IDOFFERTA);
IF NUOVO.STATO='Venduto'THEN
INSERT INTO PUBLIC.VENDITE(IDCLIENTE,IDIMMOBILE,COSTO)VALUES(NUOVO.IDCLIENTE,r.ID,r.costo);
END IF;
END
You cannot DECLARE a variable of RECORD type.
You want to get two values from your select statement. Therefore you need to declare two variables.
BEGIN ATOMIC
DECLARE VAR_ID INT;
DECLARE VAR_COSTO INT;
SET (VAR_ID, VAR_COSTO) =(SELECT offerta.IDIMMOBILE as ID, immobile.prezzomax as costo FROM PUBLIC.OFFERTA join immobile on immobile.idImmobile=offerta.idImmobile WHERE IDOFFERTA=NUOVO.IDOFFERTA);
IF NUOVO.STATO='Venduto'THEN
INSERT INTO PUBLIC.VENDITE(IDCLIENTE,IDIMMOBILE,COSTO)VALUES(NUOVO.IDCLIENTE,VAR_ID,VAR_COSTO);
END IF;
END
I have plpgsql function:
CREATE OR REPLACE FUNCTION test() RETURNS VOID AS
$$
DECLARE
my_row my_table%ROWTYPE;
BEGIN
SELECT * INTO my_row FROM my_table WHERE id='1';
my_row.date := now();
END;
$$ LANGUAGE plpgsql;
I would like to know if it's possible to directly UPDATE my_row record.
The only way I've found to do it now is:
UPDATE my_table SET date=now() WHERE id='1';
Note this is only an example function, the real one is far more complex than this.
I'm using PostgreSQL 9.2.
UPDATE:
Sorry for the confusion, what I wanted to say is:
SELECT * INTO my_row FROM my_table INTO my_row WHERE id='1';
make_lots_of_complicated_modifications_to(my_row, other_complex_parameters);
UPDATE my_row;
I.e. Use my_row to persist information in the underlying table. I have lots of parameters to update.
I would like to know if it's possible to directly update "my_row"
record.
It is.
You can update columns of a row or record type in plpgsql - just like you have it. It should be working, obviously?
This would update the underlying table, of course, not the variable!
UPDATE my_table SET date=now() WHERE id='1';
You are confusing two things here ...
Answer to clarification in comment
I don't think there is syntax in PostgreSQL that can UPDATE a whole row. You can UPDATE a column list, though. Consider this demo:
Note how I use thedate instead of date as column name, date is a reserved word in every SQL standard and a type name in PostgreSQL.
CREATE TEMP TABLE my_table (id serial, thedate date);
INSERT INTO my_table(thedate) VALUES (now());
CREATE OR REPLACE FUNCTION test_up()
RETURNS void LANGUAGE plpgsql AS
$func$
DECLARE
_r my_table;
BEGIN
SELECT * INTO _r FROM my_table WHERE id = 1;
_r.thedate := now()::date + 5 ;
UPDATE my_table t
-- explicit list of columns to be to updated
SET (id, thedate) = (_r.id, _r.thedate)
WHERE t.id = 1;
END
$func$;
SELECT test_up();
SELECT * FROM my_table;
However, you can INSERT a whole row easily. Just don't supply a column list for the table (which you normally should, but in this case it is perfectly ok, not to).
As an UPDATE is internally a DELETE followed by an INSERT anyway, and a function automatically encapsulates everything in a transaction, I don't see, why you couldn't use this instead:
CREATE OR REPLACE FUNCTION x.test_ delins()
RETURNS void LANGUAGE plpgsql AS
$func$
DECLARE
_r my_table;
BEGIN
SELECT * INTO _r
FROM my_table WHERE id = 1;
_r.thedate := now()::date + 10;
DELETE FROM my_table t WHERE t.id = 1;
INSERT INTO my_table SELECT _r.*;
END
$func$;
I managed to get this working in PLPGSQL in a couple of lines of code.
Given a table called table in a schema called example, and a record of the same type declared as _record, you can update all the columns in the table to match the record using the following hack:
declare _record example.table;
...
-- get the columns in the correct order, as a string
select string_agg(format('%I', column_name), ',' order by ordinal_position)
into _columns
from information_schema.columns
where table_schema='example' and table_name='table';
execute 'update example.table set (' || _columns || ') = row($1.*) where pkey=$2'
using _record, _record.pkey;
In the above example, of course, _record.pkey is the table's primary key.
Postgresql has not set row in update.
If you wont update full row you should assign value for each column separately
yes, its possible to update / append the row-type variable,
CREATE OR REPLACE FUNCTION test() RETURNS VOID AS $$
DECLARE
my_row my_table%ROWTYPE;
BEGIN
SELECT * INTO my_row FROM my_table WHERE id='1';
my_row.date := now();
raise notice 'date : %; ',my_row.date;
END;
$$ LANGUAGE plpgsql;
here the raise notice will display the today's date only.
but this will not update the column date in my_table.
Perhaps a stupid question!
If I call a stored proc from an After Insert trigger (T-SQL) - then how do I get the values of the "just inserted" data?
e.g.
CREATE TRIGGER dbo.MyTrigger
ON dbo.MyTable
AFTER INSERT
AS
BEGIN
EXEC createAuditSproc 'I NEED VALUES HERE!'
I don't have any identity columns to worry about - I just want to use some of the "just inserted" values to pass into my sproc.
Edit: For clarification - I need this to call a sproc and not do a direct insert to the table, since the sproc does more than one thing. I'm working with some legacy tables I can't currently amend to do things 'properly' (time/resource/legacy code), so I have to work with what I have :(
You get to the newly 'changed' data by using the INSERTED and DELETED pseudo-tables:
CREATE TRIGGER dbo.MyTrigger
ON dbo.MyTable
AFTER INSERT
AS
BEGIN
INSERT INTO myTableAudit(ID, Name)
SELECT i.ID, i.Name
FROM inserted i;
END
Given the example tables
create table myTable
(
ID INT identity(1,1),
Name varchar(10)
)
GO
create table myTableAudit
(
ID INT,
Name varchar(10),
TimeChanged datetime default CURRENT_TIMESTAMP
)
GO
Edit : Apologies, I didn't address the bit about calling a Stored Proc. As per marc_s's comment, note that inserted / deleted can contain multiple rows, which complicates matters with a SPROC. Personally, I would leave the trigger inserting directly into the audit table without the encapsulation of a SPROC. However, if you have SQL 2008, you can use table valued parameters, like so:
CREATE TYPE MyTableType AS TABLE
(
ID INT,
Name varchar(10)
);
GO
CREATE PROC dbo.MyAuditProc #MyTableTypeTVP MyTableType READONLY
AS
BEGIN
SET NOCOUNT ON;
INSERT INTO myTableAudit(ID, Name)
SELECT mtt.ID, mtt.Name
FROM #MyTableTypeTVP mtt;
END
GO
And then your trigger would be altered as like so:
ALTER TRIGGER dbo.MyTrigger
ON dbo.MyTable
AFTER INSERT
AS
BEGIN
SET NOCOUNT ON;
DECLARE #MyTableTypeTVP AS MyTableType;
INSERT INTO #MyTableTypeTVP(ID, Name)
SELECT i.ID, i.Name
FROM inserted i;
EXEC dbo.MyAuditProc #MyTableTypeTVP;
END
you can then test that this works for both a single and multiple inserts
insert into dbo.MyTable values ('single');
insert into dbo.MyTable
select 'double'
union
select 'insert';
However, if you are using SQL 2005 or lower, you would probably need to use a cursor to loop through inserted passing rows to your SPROC, something too horrible to contemplate.
As a side note, if you have SQL 2008, you might look at Change Data Capture
Edit #2 : Since you need to call the proc, and if you are certain that you only insert one row ...
ALTER TRIGGER dbo.MyTrigger
ON dbo.MyTable
AFTER INSERT
AS
BEGIN
SET NOCOUNT ON;
DECLARE #SomeInt INT;
DECLARE #SomeName VARCHAR(10);
SELECT TOP 1 #SomeInt = i.ID, #SomeName = i.Name
FROM INSERTED i;
EXEC dbo.MyAuditProc #SomeInt, #SomeName;
END;
In an SQL Server 2005 database, I have a stored procedure. I get some date in put them in a temp table. I'd like loop in this temp table and depending of the value of some fields change the value of others and make some check. I have to do this for each row.
How can I do this ?
thanks,
UPDATE1
BEGIN
SET NOCOUNT ON
--Create temp table
CREATE TABLE #MyTempTable(
id int IDENTITY(1, 1),
PriceMax int,
PriceMin int
)
-- Insert in temp table
INSERT INTO #tmpReconciliation (PriceMax, PriceMin)
SELECT PriceMax = PriceMaxProduct,
PriceMin = PriceMinProduct
FROM Products
DECLARE #RowNum int
SELECT #RowNum = Count(*) From #MyTempTable
WHILE #RowNum > 0
BEGIN
if(....)
PriceMin = 0
....
END
--Drop temp table
DROP TABLE #MyTempTable
END
I read MSDN documentation for WHILE loop and CURSOR.
For example, let's imagine your temp table is named Employee :
DECLARE #Emp_id int
DECLARE Employee_Cursor CURSOR FOR
SELECT EmployeeID
FROM Employee;
OPEN Employee_Cursor;
FETCH NEXT FROM Employee_Cursor INTO #Emp_id;
WHILE ##FETCH_STATUS = 0
BEGIN
-- Here your actions
PRINT #Emp_id
FETCH NEXT FROM Employee_Cursor INTO #Emp_id;
END;
CLOSE Employee_Cursor;
DEALLOCATE Employee_Cursor;
GO
Here I decided to print EmployeeId, but everything is possible.
Tell us what are your checks, and what your temp table looks like if you need more help.
Can't you just use a cursor and inside the cursor run an update statement??
Cursors: http://www.jackdonnell.com/articles/SQL_CURSOR.htm