php explode like function in mysql - php

Question

I have a column in my database name location which have city name and country name in this format New york,America. I want to run a select query with the explode function like which we use in php to separate values like this
so that i can get comma , separated values
select explode(",",location) from address;
Also with the alias of city column holding New York and alias of country holding value of America. So that i can use them in my store procedure and insert this values in references table in the columns city and country

Answer 1

You can not really "explode" or split on all comma's, but you can split a string on any comma using SUBSTRING_INDEX.
SELECT SUBSTRING_INDEX('New york,America', ',', 1);
-> New york

Answer 2

Use Group concat
SELECT GROUP_CONCAT( location )
FROM `address`

Answer 3

CREATE FUNCTION strSplit(x varchar(255), delim varchar(12), pos int)
returns varchar(255)
return replace(substring(
substring_index(x, delim, pos+1),
length(substring_index(x, delim, pos)) + 1
), delim, '');
select strSplit("aaa,b,cc,d", ',', 1) as second;
> b

Answer 4

You can also select the row and store it as a string, and use the explode function to separate the values if you are intending to use the function itself.

Answer 5

Assuming that exploding will be to create N number of rows, then you can do it like this.
SET #completeString = "Hola,New york,America,!,";
SET #divider = ",";
WITH RECURSIVE strings(m) AS (
SELECT
#completeString
UNION ALL
SELECT
SUBSTRING(m, INSTR(m, #divider)+ 1)
FROM
strings
WHERE
INSTR(m, #divider)!= 0
)
SELECT
SUBSTRING_INDEX(m, #divider, 1) exploted_strings
FROM
strings;
That'll give you five rows, including the empty string
+----------------+
|exploted_strings|
+----------------+
| Hola |
| New york |
| America |
| ! |
| |
+----------------+
Or have it in a Procedure.
CREATE PROCEDURE explode(IN completeString TEXT, IN divider TEXT)
BEGIN
WITH RECURSIVE strings(m) AS (
SELECT
completeString
UNION ALL
SELECT
SUBSTRING(m, INSTR(m, divider)+ 1)
FROM
strings
WHERE
INSTR(m, divider)!= 0
)
SELECT
SUBSTRING_INDEX(m, divider, 1)
FROM strings;
END
And call it like
CALL explode ("Hola,New york,America,!,",",");