Split a string and loop through values in MySQL Procedure?

To split a string and loop through all values in MySQL procedure, you do not need to use REPLACE() function. To understand, first create a stored procedure and after that create a table and call the stored procedure with some values. The value will be inserted into the table.

The query to create a stored procedure is as follows:

mysql> DELIMITER //
mysql> CREATE PROCEDURE SP_SplitString(Value longtext)
   -> BEGIN
   -> DECLARE front TEXT DEFAULT NULL;
   -> DECLARE frontlen INT DEFAULT NULL;
   -> DECLARE TempValue TEXT DEFAULT NULL;
   -> iterator:
   -> LOOP  
   -> IF LENGTH(TRIM(Value)) = 0 OR Value IS NULL THEN
   -> LEAVE iterator;
   -> END IF;
   -> SET front = SUBSTRING_INDEX(Value,',',1);
   -> SET frontlen = LENGTH(front);
   -> SET TempValue = TRIM(front);
   -> INSERT INTO store (allValues) VALUES (TempValue);
   -> SET Value = INSERT(Value,1,frontlen + 1,'');
   -> END LOOP;
   -> END //
Query OK, 0 rows affected (0.22 sec)
mysql> DELIMITER ;

Now create a table that stores the value of stored procedure. The query to create a table.

mysql> CREATE TABLE store(
   -> Id int NOT NULL AUTO_INCREMENT,
   -> allValues varchar(30),
   -> PRIMARY KEY(Id)
   -> );
Query OK, 0 rows affected (0.63 sec)

Display all records from the table. The query is as follows:

mysql> select *from store;
Empty set (0.00 sec)

Initially we do not have any records in the table. Let us call the stored procedure using CALL command. The query is as follows:

mysql> call SP_SplitString('Hi,Hello,Good Morning,Bye');
Query OK, 1 row affected (1.02 sec)

After calling the above stored procedure, let us check once again the table records. The query to display all records from the table is as follows:

mysql> select *from store;

The following is the output:

+----+--------------+
| Id | allValues    |
+----+--------------+
|  1 | Hi           |
|  2 | Hello        |
|  3 | Good Morning |
|  4 | Bye          |
+----+--------------+
4 rows in set (0.00 sec)