I was asked recently to provide a feed from Magento which would provide a list of all active SKUs, with product names, descriptions, urls and a comma separated list of categories by name.
I assembled a query in MySQL. I grabbed all the products from
catalog_product_entity
and joined it with catalog_product_entity_int
to
determine if the products are enabled—pretty standard operation. Then after
doing this I joined again to the catalog_product_flat
table for the
appropriate store ID since it’s easier to pull product information from than
joining to the same varchar table 150 times. I ran into a small problem when it
came down to getting the category names.
The categories in magento are stored as a comma separated list of entity_id
s
in the cache tables, not a comma separated list of category names.
I worked a bit on it until I ended up with a query that was capable of getting a comma separated list of names for a single row. It looked something like
SELECT GROUP_CONCAT(name) FROM
catalog_category_flat_store_1
WHERE entity_id IN ( 0, 1, 2, 3 /* example list of ids... */ )
This is where I thought, “wow MySQL makes it so easy to work with comma separated lists”—WRONG
While getting this list was simple, iterating over a result set with this query was not a possibility because when the field returns the values it returns them as a string. In other words:
"1, 2, 3" != 1, 2, 3
I pulled the following query from slickdev after searching for a number of hours:
DELIMITER //
DROP FUNCTION IF EXISTS `splitAndTranslate` //
CREATE FUNCTION splitAndTranslate(str TEXT, delim VARCHAR(124))
RETURNS TEXT
DETERMINISTIC
BEGIN
DECLARE i INT DEFAULT 0; -- total number of delimiters
DECLARE ctr INT DEFAULT 0; -- counter for the loop
DECLARE str_len INT; -- string length,self explanatory
DECLARE out_str text DEFAULT ''; -- return string holder
DECLARE temp_str text DEFAULT ''; -- temporary string holder
DECLARE temp_val VARCHAR(255) DEFAULT ''; -- temporary string holder for query
-- get length
SET str_len=LENGTH(str);
SET i = (LENGTH(str)-LENGTH(REPLACE(str, delim, '')))/LENGTH(delim) + 1;
-- get total number delimeters and add 1
-- add 1 since total separated values are 1 more than the number of delimiters
-- start of while loop
WHILE(ctr<i) DO
-- add 1 to the counter, which will also be used to get the value of the string
SET ctr=ctr+1;
-- get value separated by delimiter using ctr as the index
SET temp_str = REPLACE(SUBSTRING(SUBSTRING_INDEX(str, delim, ctr), LENGTH(SUBSTRING_INDEX(str, delim,ctr - 1)) + 1), delim, '');
-- query real value and insert into temporary value holder, temp_str contains the exploded ID
SELECT <real_value_column> INTO temp_val FROM <my_table> WHERE <table_id>=temp_str;
-- concat real value into output string separated by delimiter
SET out_str=CONCAT(out_str, temp_val, ',');
END WHILE;
-- end of while loop
-- trim delimiter from end of string
SET out_str=TRIM(TRAILING delim FROM out_str);
RETURN(out_str); -- return
END//
then adapted it for my needs and it worked. The query takes about 5 minutes to run after all the modifications I made.
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