MySql, split a string and insert into table - mysql

Question

I have two inputs for my stored procedure. One is the 'RoledID' and second one is the 'MenuIDs'. 'MenusIDs' is a list of comma separated menus ids that need to be inserted with RoledID. RoleId is just an INT and we need to put this RoledID against each MenuID. My table 'RolesMenus' contains two columns one for MenuID and one for RoleID.
Now I need to split MenuIDs and insert each MenuID with RoleID.
How can I write a stored procedure for it?

Answer 1

You can build one INSERT query (because statement allows to insert multiple records) and run it with prepared statements, e.g. -
SET #MenuIDs = '1,2,3';
SET #RoledID = 100;
SET #values = REPLACE(#MenuIDs, ',', CONCAT(', ', #RoledID, '),('));
SET #values = CONCAT('(', #values, ', ', #RoledID, ')'); -- This produces a string like this -> (1, 100),(2, 100),(3, 100)
SET #insert = CONCAT('INSERT INTO RolesMenus VALUES', #values); -- Build INSERT statement like this -> INSERT INTO RolesMenus VALUES(1, 100),(2, 100),(3, 100)
-- Execute INSERT statement
PREPARE stmt FROM #insert;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;
As you see, it can be done without stored procedure.

Answer 2

Give this a go. It may need some tweaking if the MenuIDs string does not conform to 'menuId,menuId,menuId'.
Also I do not know what data type the menuId column is in your target table (INT?) so you may have to put some numeric checking in too (in case '1,2,3,banana,4,5' is passed in as the MenuIds input parameter).
DELIMITER $$
DROP PROCEDURE IF EXISTS `insert_role_menuids`$$
CREATE PROCEDURE `insert_role_menuids`(IN RoleID INT,IN MenuIDs varchar(500))
BEGIN
declare idx,prev_idx int;
declare v_id varchar(10);
set idx := locate(',',MenuIDs,1);
set prev_idx := 1;
WHILE idx > 0 DO
set v_id := substr(MenuIDs,prev_idx,idx-prev_idx);
insert into RolesMenus (RoleId,MenuId) values (RoleID,v_id);
set prev_idx := idx+1;
set idx := locate(',',MenuIDs,prev_idx);
END WHILE;
set v_id := substr(MenuIDs,prev_idx);
insert into RolesMenus (RoleId,MenuId) values (RoleID,v_id);
END$$
DELIMITER ;

Answer 3

for this solution, you must create a table with the name split_table, it can have a id(autoincrement) if you need it and must have a column where to store the value (I call it valor)
DELIMITER $$
USE `dbaname`$$
DROP PROCEDURE IF EXISTS `Split`$$
CREATE DEFINER=`root`#`localhost` PROCEDURE `Split`(
IN cadena VARCHAR(8000),
IN delimitador VARCHAR(10)
)
BEGIN
TRUNCATE split_table;
SET #posicion = 1;
SET #ldel = LENGTH(delimitador);
SET #valor = SUBSTRING_INDEX(cadena, delimitador, 1);
WHILE #valor <> '' AND #posicion > 0 DO
SET #valor = SUBSTRING_INDEX(cadena, delimitador, 1);
INSERT INTO split_table(valor) VALUES (#valor);
SET #posicion = POSITION(delimitador IN cadena);
SET #largo = LENGTH(cadena);
IF #largo >= #posicion THEN
SET cadena = SUBSTR(cadena, #posicion + #ldel, #largo - #posicion);
SET #valor = SUBSTRING_INDEX(cadena, delimitador, 1);
ELSE
SET #posicion = 0;
END IF;
END WHILE;
END$$
DELIMITER ;

Answer 4

First create procedure
CREATE DEFINER=`root`#`localhost` PROCEDURE `split_str_save_to_tmp_table`(
IN _str TEXT,
IN _table_name VARCHAR(80)
)
BEGIN
#DROP FIRST OLD TABLE
SET #q = CONCAT('DROP TEMPORARY TABLE IF EXISTS ', _table_name);
PREPARE st FROM #q;
EXECUTE st;
#CREATE TABLE
SET #q = CONCAT('CREATE TEMPORARY TABLE ', _table_name, '(id INT UNSIGNED NOT NULL PRIMARY KEY (id) )' );
PREPARE st FROM #q;
EXECUTE st;
SET #ids = REPLACE(_str, ',', '),(');
SET #ids = CONCAT('(', #ids, ')');
#INSERT INTO TABLE
SET #q = CONCAT('INSERT INTO ' , _table_name ,' VALUES');
SET #q = CONCAT(#q, #ids);
PREPARE st FROM #q;
EXECUTE st;
DEALLOCATE PREPARE st;
END
Then call
call split_str_save_to_tmp_table('1,2,3,4,5', 'tmp_split_product');
SELECT * FROM tmp_split_product

Answer 5

AFAIK MySQL does not have a function to split strings. Here is the MySQL manual for string related functions. In the comments section should be some information about workarounds for splitting string with substring-functions but not really usable:
MySQL manual