How to get values from MySQL(5.6) column if that contains json document as string

Question

How to get values from MySQL(5.6) column if that contains JSON document as a string

For example, if we have a table - employee in that we have three columns id, nam

Answer 1

Rahul's answer did not work quite well for me, so I edited it and this worked for me:

DELIMITER $$

DROP FUNCTION IF EXISTS `json_extract_c`$$

CREATE FUNCTION `json_extract_c`(
details TEXT,
required_field VARCHAR (255)
) RETURNS TEXT CHARSET latin1
BEGIN
SET details = TRIM(LEADING '{' FROM TRIM(details));
SET details = TRIM(TRAILING '}' FROM TRIM(details));
RETURN TRIM(
    BOTH '"' FROM SUBSTRING_INDEX(
        SUBSTRING_INDEX(
            SUBSTRING_INDEX(
                details,
                CONCAT(
                    '"',
                    SUBSTRING_INDEX(required_field,'$.', - 1),
                    '":'
                ),
                - 1
            ),
            ',"',
            1
        ),
        ':',
        -1
    )
) ;
END$$

DELIMITER ;