I am trying to make a procdure in mysql that returns me an array with the result, I used to do with the oracle ref cursor, but in mysql do not know how to proceed,
I have to pass parameters too...
Anyone know how I can do, or have an example to show me? Thank you very much...
MySQL doesn't have a refcursor like Oracle. If you are planning to write a stored procedure that returns multiple rows/result set in MySQL just do
DROP procedure IF EXISTS `sample`;
DELIMITER $$
CREATE PROCEDURE `sample`(p_rank IN INT)
BEGIN
select * from MyTable where id=p_rank;
END$$
DELIMITER ;
and call sample();. It will return a result set which you can use.
There is no analog of REF CURSOR in MySQL. Stored procedures and functions allow to pass and return only scalar datata types, see the reference here - CREATE PROCEDURE and CREATE FUNCTION Syntax.
MySQL cannot operate with arrays. A workaround is to use a table (or TEMPORARY TABLE).
Also - take advantage of visual object editors and stored procedure debugger in dbForge Studio for MySQL.
Related
I have MySQL procedure where I want to get a result of query:
SELECT id FROM mbus_clients WHERE second_name like surnamePart AS
So it should be an array. The decision I've found in the internet is to use temporary table.
But how can I return a table and read with PHP? Is it ok?
Simply call the procedure:
CALL procedurename();
If the procedure performs a SELECT, the result set of the procedure call will be the same as if you'd performed the query itself. You can then fetch the rows using PHP the same way as if you'd performed a SELECT.
I have created a procedure in mysql having multiple select statements in it.
Here is my code :
DELIMITER $$
USE `databasename`$$
DROP PROCEDURE IF EXISTS `wholeProjectDetails`$$
CREATE DEFINER=`databasename`#`localhost` PROCEDURE `wholeProjectDetails`(IN givenpid INT)
BEGIN
select * from projects where projectid=givenpid;
select * from projects where projectid<>givenpid;
END$$
DELIMITER ;
When i called this procedure using statement :
call wholeProjectDetails(2);
it is displaying only first statement's results, i want that it will display both statement's records.
Please let me know what i am doing wrong?
Thanks
When you call this procedure, MySQL creates two result-sets. Now, you need to get these two result-sets using your MySQL client. Read information about client you use, does it support this feature? For example, in .NET you can use IDataReader.NextResult Method, in mysqli - mysqli::next_result function, and so on.
If you want just to view these result-sets, you can install one of MySQL GUI tools, there are free ones.
In SQL Server I am able to achieve this using dynamic sql string, but now I need to do the same thing for mysql but am getting nowhere, is there any way to achive this
IF NOT EXISTS (SELECT 1 FROM mysql.proc p WHERE NAME = 'stored_proc_name')
BEGIN
DELIMITER $$
CREATE PROCEDURE justATest()
BEGIN
-- some SP logic here
END$$
END
I am storing the whole sql as a string inside a database column and execute the statement using a prepared statement Execute inside another stored procedure.
IF NOT EXISTS(SELECT 1 FROM mysql.proc p WHERE db = 'db_name' AND name = 'stored_proc_name') THEN
....
taken from
Older Post
Control statements like if then else are only allowed inside Stored Procedures in MySQL (unfortunately). There are usually ways around this, but it depends why you are conditionally creating the sproc.
E.g. If you're trying to avoid errors when running build scripts because sprocs already exist then you can use a conditional drop statement prior to your create like this:
DROP PROCEDURE IF EXISTS justATest;
CREATE PROCEDURE justATest()
BEGIN
-- enter code here
END;
This will ensure the any changed code gets run (rather than skipped).
I have a procedure that creates a table, is it possible to have a view (or similar) that can call the procedure then select from the table?
I've tried this:
DELIMITER $$
CREATE DEFINER=`root`#`localhost` FUNCTION `new_routine`(p1 INT) RETURNS int(1)
BEGIN
CALL rMergeDateFields();
RETURN 1;
END
CREATE VIEW `db`.`vIntervals` AS
SELECT new_routine(0) AS col1;
SELECT * FROM MergedData;
but I get this error
Error 1422: Explicit or implicit commit is not allowed in stored function or trigger.
Any ideas?
No, you cannot. Views are typically read-only operations; and that behavior cannot be guaranteed if stored-procedures are invoked.
Related question:
How to call Stored Procedure in a View?
Is it possible to call stored procedure in view?
Here is a canonical resource:
http://dev.mysql.com/doc/refman/5.1/en/view-updatability.html
Some views are updatable. That is, you can use them in statements such as UPDATE, DELETE, or INSERT to update the contents of the underlying table. For a view to be updatable, there must be a one-to-one relationship between the rows in the view and the rows in the underlying table. There are also certain other constructs that make a view nonupdatable.
As invoking the stored procedure cannot assure 1:1 relationships with view rows, the update is not permitted.
You can't do this from a view, but a stored procedure itself can return a result set.
DELIMITER $$
CREATE DEFINER=`root`#`localhost` PROCEDURE `merge_and_select` ()
BEGIN
CALL rMergeDateFields();
SELECT * FROM MergeData;
END $$
If you CALL merge_and_select() the rMergeDateFields procedure will be run and then you will get the contents of the MergeData table returned to you, in one step... which sounds like what you're wanting.
This is, however, a really bad implementation, because there's no control for concurrent calls to merge_and_select(), so all kinds of things could go wrong if it's run more than once at the same time.
However, depending on what you really need rMergeDateFields() to do, it's possible that you could rewrite rMergeDateFields() to actually perform whatever work you need done and return it directly to the client without using the MergeData table using an unbounded SELECT, as shown above.
Anything you SELECT in a stored procedure without using INTO a variable is returned to the client as a response from the CALL.
I've Googled but come up with nothing that I can get my head around.
Are the performance gains from using stored procedures significant?
Would I still want to use prepared statements in conjunction with stored procs or is it generally a one or the other thing?
Can I create stored procs through PHPMyAdmin and manage them from there as well?
What would a stored procedure look like for something simple like this-
SELECT * FROM table a
INNER JOIN otherTable b
ON a.join_id=b.join_id
WHERE someVar = :boundParam
and how would the PHP work (PDO) to call it and bind its parameter?
Consider this a gentle introduction to stored procedures in MySQL: http://www.mysqltutorial.org/mysql-stored-procedure-tutorial.aspx
You sure can create/manage stored procedures in phpMyAdmin.
I have created one procedure but the time of call this procedure what parameter I can pass to get the output
CREATE DEFINER=`root`#`localhost` PROCEDURE `A`(
In user_id bigint,
Out address varchar(250)
)
BEGIN
select Address into address
from UserDetail_table
where User_ID = user_id;
END