Function resembling the work of Explode in MySQL

Question

Is there any function in MySQL to explode data of a column and then retrieve it? Like if a column data is P:12 , then can the data be exploded on ':' and then read?

Not an answer to your Q but you should always try to keep only a single piece of data in any one field/record. In this case, how about storing the P seperately from the 12? — Basic, Apr 03 '12 at 08:23
It seems this question was asked before: http://stackoverflow.com/questions/471914/can-you-split-explode-a-field-in-a-mysql-query — Bram, Apr 03 '12 at 08:21

score 2 · Accepted Answer · answered Apr 03 '12 at 08:21

2

Here are many discussion about the SPLIT problem in mysql :

http://dev.mysql.com/doc/refman/5.0/en/string-functions.html

answered Apr 03 '12 at 08:21

BMN

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score 1 · Answer 2 · answered Apr 03 '12 at 08:41

You can write a Split function in MYSQL check this link

From the Link

CREATE FUNCTION SPLIT_STR(
  x VARCHAR(255),
  delim VARCHAR(12),
  pos INT
)

RETURNS VARCHAR(255)
RETURN REPLACE(SUBSTRING(SUBSTRING_INDEX(x, delim, pos),
       LENGTH(SUBSTRING_INDEX(x, delim, pos -1)) + 1),
       delim, '');

Usage

SELECT SPLIT_STR(string, delimiter, position)

Example

SELECT SPLIT_STR('a|bb|ccc|dd', '|', 3) as third;

+-------+
| third |
+-------+
| ccc   |
+-------+

score 0 · Answer 3 · answered Aug 30 '15 at 04:42

I parse the string using a while loop and insert the split items into a temporary table. It's complicated, but I copy and paste the code, then change the table name for readability. Here's an example to parse a comma delimited list of user ids into a temp table:

CREATE PROCEDURE spParse
(_UserList MEDIUMTEXT)
BEGIN
    DECLARE _Pos INT;
    DECLARE _Start INT;
    DECLARE _Item INT;
    DECLARE _Length INT;

    CREATE TEMPORARY TABLE IF NOT EXISTS TempUserList
    (
        UserID INT
    );

    SET _Length = LENGTH(_UserList);
    SET _Pos = 1;
    SET _Start = 1;
    divide_loop:LOOP
        IF _Pos > _Length Then
            LEAVE divide_loop;
        End If;
        IF SUBSTRING(_UserList,_Pos,1) = ',' Then
            IF _Pos - _Start > 0 Then
                IF IsNumeric(SUBSTRING(_UserList,_Start,_Pos-_Start)) Then
                    SET _Item = CONVERT(SUBSTRING(_UserList,_Start,_Pos-_Start),Signed);
                    INSERT INTO TempUserList (UserID)
                    VALUES (_Item);
                End If;                 
            End If;
            SET _Start = _Pos + 1;
        End If;
        SET _Pos = _Pos + 1;
    END LOOP divide_loop;
    IF _Start <= _Length Then
        If IsNumeric(SUBSTRING(_UserList,_Start,_Length - _Start + 1)) Then
            SET _Item = CONVERT(SUBSTRING(_UserList,_Start,_Length - _Start + 1),Signed);       
            INSERT INTO TempUserList (UserID)
            VALUES (_Item);
        End If;
    End If;

    SELECT UserID FROM TempUserList;

    DROP TABLE TempUserList;
END

Function resembling the work of Explode in MySQL

3 Answers3

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