I cannot add custom function to my MySql database,
I have problems even with simple function like this
DELIMITER $$
DROP FUNCTION IF EXISTS `foo`$$
CREATE FUNCTION `foo`(IN doWork boolean) RETURNS boolean
NO SQL
DETERMINISTIC
BEGIN
return doWork;
END%%
DELIMITER ;
when I execute above query , phpmyadmin show that all is ok, but when I want to call this function phpmyadmin say's that cannot find this function, also table ROUTINES in information_schema dont contains it.
your end delimiter is different from the defined one
replace
END%%
with
END $$
Related
PostgreSQL allows you to define a function that returns a table. Does MySQL provide a similar feature? My research suggests not, but I'd be grateful if someone could show me otherwise.
Essentially, I want to add a "running-total" column to a rowset, and this is one of the options I'm investigating.
You can not return a table using MySQL function, but you can using a stored procedure, I got something like this:
DELIMITER $$
CREATE DEFINER=`root`#`%` PROCEDURE `sp_Name`(OUT po_ErrMessage VARCHAR(200))
BEGIN
DECLARE EXIT HANDLER FOR SQLEXCEPTION
BEGIN
SET po_ErrMessage = 'Error in procedure sp_Name';
END;
SELECT * FROM table_name;
END
And for more information please refer to this link
I am trying to understand, why delimiter used with stored procedure in mysql?
but i couldn't.
DELIMITER //
CREATE PROCEDURE GetAllProducts()
BEGIN
SELECT * FROM products;
END //
DELIMITER ;`
Mysql's default delimiter is ; which is used for one statement in the command line , something as
select * from users ;
When you write a trigger or stored procedure to execute the entire code mysql needs to understand that its a block of code/query.
If no delimiter is provided then when mysql encounters any ; inside the store procedure or trigger it will think that as one statement and will try to execute it. So we need to provide a delimiter for store procedure or trigger and make mysql understand that anything within that delimiter is one complete set of code.
So in your example
SELECT * FROM products;
it will be a part of the complete statement when there is a delimiter other than ; is provided at the beginning.
Can i call a stored procedure inside a mysql function. I tried but it throws syntax error. Is it possible?
DELIMITER $$
DROP FUNCTION IF EXISTS `fn_abcd`$$
CREATE FUNCTION `fn_abcd`(orderItem BIGINT(45),quantity INT) RETURNS double
BEGIN
DECLARE TotalNetValue DOUBLE;
set TotalNetValue = call sp_abcd(orderItem,quantity);
RETURN TotalNetValue;
END$$
DELIMITER ;
A stored procedure has no return value. You simply cannot do this:
SET someVar = CALL someProcedure();
If you need to retreive some value computed in the procedure, you need to either:
have your stored procedure write the data in a session variable (SELECT something INTO #var) (this is ugly, but it works)
use an INOUT parameter
rewrite the procedure as a function
It is understood that most drivers (JDBC, PDO) will treat the result of the last SELECT statement executed in a stored procedure, as the result of a query like CALL some_procedure(). This feature is specific to the MySQL client/server protocol, the MySQL SQL syntax has no equivalent.
I need help converting this MS SQL update trigger to MySQL. My problem is with converting the MS SQL UPDATE() function, which identifies the specific columns that were updated:
ALTER TRIGGER [dbo].[tran_upd_action] ON [dbo].[tran_action]
FOR UPDATE AS
BEGIN
IF ##ROWCOUNT>0
BEGIN
IF update(column1) OR update(column2)
BEGIN
INSERT into tran_indexerqueue
(trankey, trkey2, tranname) SELECT tran_actionid, 0, 'tranaction' from inserted
END
END
END
This does not have the rowcount check, but the basic trigger syntax will be like this. Note that only the Super User role can create a trigger. Also, you have to change the delimiter first, which is usually a big gotcha for MSSQL DBAs.
DELIMITER $$
CREATE TRIGGER `tran_upd_action` AFTER UPDATE ON `tran_action` FOR EACH ROW BEGIN
INSERT INTO tran_indexerqueue
(trankey, trkey2, tranname)
VALUES(OLD.trankey, OLD.trkey2, OLD.tranname);
END $$
DELIMITER ;
I am trying out functions and triggers int postgreSQL, however i am having a problem, when the function is triggered it is giving me an error
ERROR: control reached end of trigger procedure without RETURN
this particular procedure is only executing an insert into command so i do not see why it needs a return
this is the script:
CREATE OR REPLACE FUNCTION forest_aud_func() returns trigger as $tree_stamp$
BEGIN
insert into Audit values('k',124,'l');
END;
$tree_stamp$
LANGUAGE plpgsql;
create trigger forest_aud_ins after insert on forest
for each row execute procedure forest_aud_func()
insert into forest values('Blue',1600,'Malta','Health Ltd')
The error message tells you all. You need to do a RETURN from the trigger function:
CREATE OR REPLACE FUNCTION forest_aud_func() returns trigger as $tree_stamp$
BEGIN
insert into Audit values('k',124,'l');
return new;
END;
$tree_stamp$
LANGUAGE plpgsql;
From the manual:
A trigger function must return either NULL or a record/row value having exactly the structure of the table the trigger was fired for.