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$$
DELIMITER ;
A stored procedure has no return value. You simply cannot do this:
SET someVar = CALL someProcedure();
If you need to retreive some value computed in the procedure, you need to either:
have your stored procedure write the data in a session variable (SELECT something INTO #var) (this is ugly, but it works)
use an INOUT parameter
rewrite the procedure as a function
It is understood that most drivers (JDBC, PDO) will treat the result of the last SELECT statement executed in a stored procedure, as the result of a query like CALL some_procedure(). This feature is specific to the MySQL client/server protocol, the MySQL SQL syntax has no equivalent.
Related
Please see line two 24.2.1 Stored Routine Syntax
" A procedure is invoked using a CALL statement (see Section 13.2.1, “CALL Statement”), and can only pass back values using output variables."
I using laravel and call procedure.
laravel
$response = DB::select('CALL get_data');
procedure
DELIMITER $$
CREATE DEFINER=`root`#`localhost` PROCEDURE `get_data`()
BEGIN
SELECT name, gender, residence, introduce FROM users;
END$$
DELIMITER ;
And $resopnse have data!!!
It's curious.
I didn't use out parameter.
pleace teach me .
I'm converting SQL Server stored procedures to MySQL and running into issues. I have a stored procedure with an IF THEN ELSE that, while not giving errors, is not returning any data either and I'm not seeing the problem to fix it. The queries by themselves are correct and return data but don't seem to work in the stored procedure. This is a simplified version of the real query just FYI.
The SQL for creating the stored procedure is:
DROP PROCEDURE IF EXISTS `sp_GetVolunteerAwardsList`;
DELIMITER //
CREATE PROCEDURE `sp_GetVolunteerList`( IN glAward_in int)
BEGIN
DECLARE glAward_In INT;
DECLARE awardType_In varchar(100);
DECLARE awardActive INT;
IF (glAward_In) = 0 THEN
SELECT * FROM tbl_volunteer
ELSEIF (glAward_In) = 1 THEN
SELECT * FROM tbl_volunteerpositions
END IF;
END
//
As always, any assistance would be most appreciated.
Check the glAward_In parameter or variable.
The SP is receiving the parameter glAward_in, i in lower case.
Then there is a DECLARE that declares a different variable glAward_In, i in upper case.
The if is done using the glAward_In in uppercase which is not set in any place of the SP. And the parameter in lower case is not used anywhere in the SP.
I think you have to remove the DECLARATION of the variable in upper case, and use the parameter in lowercase for the IF evaluation.
I've got a procedure that uses a loop with a SELECT statement, but the statement is actually just to set a variable. That means there's a lot of stuff being displayed that I don't need to see, and it's flooding my terminal.
Here's an example of what I mean, though this isn't actually what I'm running (because that's company information):
DROP PROCEDURE IF EXISTS test;
DELIMITER #
CREATE PROCEDURE test()
BEGIN
SET #key:=1;
testloop: REPEAT
SELECT
#dummyString := stringField
FROM
aTable;
SET #dummyStringAll :=CONCAT(#dummyStringAll,$dummyString);
SET #key := #key + 1;
UNTIL #key>10
END REPEAT testloop;
END #
DELIMITER ;
Is it possible to run SELECT (whether inside a procedure or not) and not show the results from a SELECT query? Maybe not the most important thing in the world, but it would be helpful.
Stored procedures will return a query resultset if it isn't stored in a variable.
How does it know that you are storing the result in a variable?
Not be using variables in the query but by using the SELECT value INTO <variable> syntax in the query. see: 13.2.9.1 SELECT ... INTO Syntax
From the FAQ:
1) Can MySQL 5.6 stored routines return result sets?
Stored procedures can, but stored functions cannot. If you perform an ordinary SELECT inside a stored procedure, the result set is returned directly to the client.
So, using the 'SELECT ... INTO ...' syntax will prevent the procedure returning the resultset from a query.
My first stored procedure returns 3 values which I will use in another stored procedure. I tried like this:
CREATE DEFINER=`db`#`%` PROCEDURE `SP_Expense`(
flightInstanceId INT
)
begin
SELECT F.BaseFare, CALL SP_Orderdetail(F.fareId)
FROM fare;
end$$
but I'm getting a syntax error.
Is it possible in functions? Which is return table ?
You cant call a stored procedure from with in a select statement. What you are doing is trying to call a function. Create Fucntion. If I understand your question SP_Orderdetail(F.fareId) returns a table? I wonder if you could turn SP_Orderdetail(F.fareId) into a view instead?
This might help as well: Create Stored procedure and Create function syntax
I'm working with procedures for the first time in MySQL, but for some reason I keep getting NULL. My test procedure is a simple one, it just adds.
delimiter $$
create procedure adds(in r double, out a double)
begin
set a = r + r;
end $$
delimiter ;
CALL adds(5, #a);
SELECT #a;
Not sure if I'm doing this right. For #a it just prints out NULL.
A procedure is linked to a database.
You have not specified one, and therefor it will probably be attached to a different database than the one you are expecting.
When you change databases, MySQL will not longer find your stored procedure because it only looks in the correct DB.
Remember to always specify your database when declaring a stored proc
create procedure mydatabase.adds(in r double, out a double)
^^^^^^^^^^^