Unserialize through query at database level itself

Question

I have a column value stored in the database as:

a:2:{i:0;s:2:\"US\";i:1;s:2:\"19\";}

I want to unserialize it during the mysql

Answer 1

How about this? This is a MySQL user-defined function with embedded php:

CREATE FUNCTION unserialize_php RETURNS STRING SONAME 'unserialize_php.so';

Usage example:

SELECT unserialize_php('O:8:"stdClass":2:{s:1:"a";s:4:"aaaa";s:1:"b";s:4:"bbbb";}', "$obj->a") 
AS 'unserialized';

+--------------+
| unserialized |
+--------------+
| aaaa         |
+--------------+
1 row in set (0.00 sec)

drop function unserialize_php;

Source: https://github.com/junamai2000/mysql_unserialize_php

You can create a MySQL user-defined function and call zend_eval_string inside of the function so that you can bring back PHP variables to a MySQL result. I implemented a sample program. You can try it.

Answer 2

From http://www.blastar.biz/2013/11/28/how-to-use-mysql-to-search-in-php-serialized-fields/

Standard array

SELECT * FROM table WHERE your_field_here REGEXP '.*;s:[0-9]+:"your_value_here".*'

Associative array

SELECT * FROM table WHERE your_field_here REGEXP '.*"array_key_here";s [0-9]+:"your_value_here".*'

Answer 3

You can join your table simply in this way

    SELECT 
    table_to_join.ID as table_to_join_ID ,
    serialized_table.ID AS   serialized_table_ID,
FROM
    table_to_join
        LEFT JOIN
    serialized_table  ON  serialized_table.array_field  REGEXP CONCAT_WS('','.s:[0-9];s:', table_to_join.ID ,';.') ;

Take mention. I use index from 0 to 9 in table. If you have other indexes you must correct regexp

Answer 4

It's a very bad practice to add programming language dependent structures to database. If you do so, you always have to rely on that language.

The best approach is to have normalized table structure (different fields or tables).

The next approach is to save data as a delimited string (e.g.: 0,US,1,19). Then you can use MySQL's SUBSTRING() or to use standard serialization mechanisms like JSON encode.

Answer 5

For serialized arrays You can use function getPhpSerializedArrayValueByKey from here

Answer 6

MySQL doesn't know what a PHP serialization is. You can't do it.