I am using a stored procedure call as follows:
DELIMITER //
CREATE procedure getCustomer(NID varchar(200),Name varchar(200), OUT Flag INTEGER, OUT CID VARCHAR(200))
BEGIN
DECLARE id varchar(200);
SET Flag = 0;
SET id = CONCAT(NID, '_' , Name);
SELECT 1 INTO Flag FROM Customer WHERE customerID = id;
IF Flag = 1 THEN
SET CID = id;
ELSE
INSERT INTO Customer(NID, Name, customerID) VALUES(NID, Name, id);
SET CID = id;
END IF;
END//
can you please tell me how to call IN, OUT variables in testing this procedure call?
or simply how to test this procedure call using exec proceudre_name(parameter) format?
As documented under CALL Syntax:
To get back a value from a procedure using an OUT or INOUT parameter, pass the parameter by means of a user variable, and then check the value of the variable after the procedure returns. (If you are calling the procedure from within another stored procedure or function, you can also pass a routine parameter or local routine variable as an IN or INOUT parameter.) For an INOUT parameter, initialize its value before passing it to the procedure. The following procedure has an OUT parameter that the procedure sets to the current server version, and an INOUT value that the procedure increments by one from its current value:
CREATE PROCEDURE p (OUT ver_param VARCHAR(25), INOUT incr_param INT)
BEGIN
# Set value of OUT parameter
SELECT VERSION() INTO ver_param;
# Increment value of INOUT parameter
SET incr_param = incr_param + 1;
END;
Before calling the procedure, initialize the variable to be passed as the INOUT parameter. After calling the procedure, the values of the two variables will have been set or modified:
mysql> SET #increment = 10;
mysql> CALL p(#version, #increment);
mysql> SELECT #version, #increment;
+--------------+------------+
| #version | #increment |
+--------------+------------+
| 5.5.3-m3-log | 11 |
+--------------+------------+
However, from your procedure it looks as though what you really want is to define a uniqueness constraint over the customerID column in your Customer table and then use INSERT ... ON DUPLICATE KEY UPDATE:
ALTER TABLE Customer ADD UNIQUE (customerID);
INSERT INTO Customer
(NID, Name, customerID)
VALUES
(123, 'foobar', CONCAT(123, '_', 'foobar'))
ON DUPLICATE KEY UPDATE
NID = NID
;
Example using IN:
DELIMITER //
CREATE PROCEDURE `procWithIN` (IN var1 INT)
BEGIN
UPDATE someTable set fldname = fldname + var1;
END//
CALL procWithIN(10);
Example using OUT:
DELIMITER //
CREATE PROCEDURE `procWithOUT` (OUT var1 VARCHAR(100))
BEGIN
SET var1 = 'This is a test';
END //
SET #someText = NULL;
CALL procWithOut(#someText);
-- do something with #someText (containing 'This is a test')
SELECT * FROM tbl WHERE fld=#someText
Example with INOUT
DELIMITER //
CREATE PROCEDURE `procWithINOUT` (INOUT var1 INT)
BEGIN
SET var1 = var1 + 100;
END //
SET #someInt = 10;
CALL procWithINOUT(#someInt);
-- #someInt now contains 110
Related
I'm trying to call a stored procedure from another stored procedure and store the value in a variable. The inner stored procedure basically checks if something exists and uses a select statement to return a zero or one. I keep getting an error. In this situation, MySQL is saying "=" is not valid at this position, expecting ";"
CREATE PROCEDURE `CardNames_Add` (searchedCard VARCHAR(50))
BEGIN
DECLARE exist TINYINT;
EXECUTE exist = CardNames_CheckExist searchedCard
IF (exist = 0)
INSERT INTO card_names (name)
VALUE(searchedCard)
END
You have to rewrite you other stored procedure, that you don't need btw, to give back a result
CREATE PROCEDURE CardNames_CheckExist (IN searchedCard VARCHAR(50), OUT result TINYINT )
BEGIN
--do some stuzff
result = 1
END
CREATE PROCEDURE `CardNames_Add` (searchedCard VARCHAR(50))
BEGIN
CALL CardNames_CheckExist(searchedCard,#result);
IF (#result = 0) THEN
INSERT INTO card_names (name)
VALUES (searchedCard);
END IF;
END
I have create MySQL procedure having multiple IN parameters. I want to call procedure with few parameters but when I leave other fields blank it shows this error:
DELIMITER $$
CREATE DEFINER=itzakeed_akeed#localhost PROCEDURE ApiKez(
IN Choice VARCHAR(100),
IN ValidKey VARCHAR(100),
IN azid INT(5),
IN amts FLOAT(50)
)
BEGIN
DECLARE GetKey VARCHAR(100);
DECLARE Balance FLOAT;
CASE WHEN Choice='KeyCheck' THEN
SELECT COUNT(id) INTO GetKey
FROM users
WHERE api_key=ValidKey;
if key is valid
IF GetKey=1 THEN
SELECT *
FROM users
WHERE key=ValidKey;
ELSE
SELECT 0;
END IF;
ELSE
SELECT "INVALID INPUT CHOICE";
END CASE;
END
$$
DELIMITER ;
No you cannot call a procedure with less parameters than what is required. However, you can pass null or empty strings and check if a parameter has a value from withing the stored procedure.
This is my first procedure in MySQL and I am trying to take the ID column from my table, store it into a variable and then add 1 to it and then update the table with the new value. When I call myFirstProcedure() it sets all of the id values to 6 rather than increasing each by 1. How do I code this correctly?
DELIMITER //
CREATE PROCEDURE myFirstProcedure()
BEGIN
DECLARE IdValue INT DEFAULT 0;
SELECT COUNT(*) INTO IdValue
FROM new_table;
UPDATE new_table
SET ID = IdValue +1;
END//
DELIMITER ;
That is because you are setting all the values to the same value. You can do this by incrementing the variable in the stored procedure:
DELIMITER //
CREATE PROCEDURE myFirstProcedure()
BEGIN
DECLARE v_maxid;
SELECT COUNT(*) INTO v_maxid
FROM new_table;
UPDATE new_table
SET ID = (v_maxid := v_maxid + 1);
END//
DELIMITER ;
Note that COUNT(*) will return 0 if the table is empty, so there is no problem with NULL values.
I am calling a stored procedure (1) within a stored procedure (2). Is there a way to pass values of (1) INTO parameters of (2) so that I can return to the calling program? Thank you.
Yes. You can define parameters to be INOUT or OUT.
This allows the procedure to pass values back to the caller.
As a brief example, proc1 has parameters that are defined as INOUT and OUT. In proc1 values are assigned to those parameters.
And proc2 calls proc1. The values set in proc1 are available to proc2.
DELIMITER ;
CREATE PROCEDURE proc1(INOUT ua INT, OUT ob INT)
BEGIN
SET ua = ua + 1;
SET ob = 1;
END$$
CREATE PROCEDURE proc2()
BEGIN
DECLARE a INT;
DECLARE b INT;
SET a = 0;
SET b = 0;
CALL proc1(a,b);
SELECT a, b;
END$$
DELIMITER ;
CALL proc2();
a b
---- ----
1 1
i am trying to write a stored procedure for mysql, and basicly, it will select one id, and update selected id's operationdate.
DELIMITER //
CREATE PROCEDURE getID(
IN proc_intervaldate datetime
)
BEGIN
DECLARE RUserID BIGINT;
SELECT
UserID
INTO RUserID
FROM Tasks
WHERE OperationDate < proc_intervaldate
LIMIT 1 ;
UPDATE Tasks SET OperationDate = now() WHERE UserID = RUserID;
SELECT RUserID ;
END //
DELIMITER ;
but when i use this, procedure, it will return UserID but not update, if i comment
SELECT RUserID
then, it updates, but no data returns.
when I use this, procedure, it will return UserID but not update, if I comment 'SELECT RUserID;' then, it updates, but no data returns.
You can change definition of stored procedure to use an OUT parameter rather than just IN. With that, you can just capture the OUT value on the same OUT parameter, in your scripting language. Meaning you need not execute:
SELECT RUserID ;
in your stored procedure.
Change your SP definition as below:
DELIMITER //
CREATE PROCEDURE getID( IN proc_intervaldate datetime, OUT RUserID bigint )
BEGIN
SELECT
UserID INTO RUserID
FROM Tasks
WHERE
OperationDate < proc_intervaldate
LIMIT 1 ;
UPDATE Tasks SET OperationDate = now() WHERE UserID = RUserID;
END;
//
DELIMITER ;
You can call this stored procedure like, for example, at MySQL console:
SET #RUserID := 0;
CALL getID( now(), #RUserID );
SELECT #RUserID;
Refer to:
MySQL: CALL procedure syntax
To get back a value from a procedure using an OUT or INOUT parameter,
pass the parameter by means of a user variable, and then check the
value of the variable after the procedure returns.