Hi Daevid,
Daevid Vincent wrote:
-----Original Message-----
From: Baron Schwartz [mailto:[EMAIL PROTECTED]
Daevid Vincent wrote:
I'm having trouble figuring out the logic/query I want.
I know that all those "OR"s are not right.
I'm doing this in PHP and mySQL (of course),
so if it can't be done with a single query, I can split it up.
Here's the challenge, given a text field search box, someone enters:
Sony 20" TV
How do I search for that, not knowing which fields are which?
For example, they could have also entered:
20" Sony TV
I think you're describing full-text indexing. MySQL supports
it but only on MyISAM
tables. If you don't want to use MyISAM, full-text search
engines like Lucene or Sphinx may be worth looking at.
I don't think I am. While full-text indexing might help since
the indexes would be faster. I think this is a logic issue.
The full-text index would be useful on a TEXT or BLOB or some
long varchar field, but it doesn't solve that I'm trying to
pull from two different tables, Product and Company and mapping
the free-form string to fields that could be one of several.
I think my first attempt is close, but it's something to do with
all the AND and OR combinations that's not right.
My version gives many results because it matches ("SONY" OR "TV" OR "20").
I need it to match ("SONY" AND "TV" AND "20")
But this isn't it either (returns 0 results) because some fields,
like the categories.name, products.upc and products.model don't match
so the entire condition fails.
SELECT products.*, companies.name AS company_name, categories.name AS category_name
FROM products
LEFT JOIN companies ON company_id = companies.id
LEFT JOIN categories ON category_id = categories.id
WHERE products.enabled = 1
AND(
(products.model LIKE 'sony%' OR products.model LIKE '20%' OR products.model LIKE 'tv%')
AND (products.upc LIKE 'sony' OR products.upc LIKE '20' OR products.upc LIKE 'tv')
AND (products.name LIKE '%sony%' OR products.name LIKE '20%' OR products.name LIKE '%tv%')
AND (companies.name LIKE 'sony%' OR companies.name LIKE '20%' OR companies.name LIKE 'tv%')
AND (categories.name LIKE '%sony%' OR categories.name LIKE '20%' OR categories.name LIKE '%tv%')
)
ORDER BY categories.name DESC, products.name ASC, companies.name ASC;
Also, the 'SONY' is really the companies.name,
while the '20"' _AND_ 'TV' together form '20" TV' to make the products.name.
+------------------+--------------+--------------+--------------+
| name | model | upc | company_name |
+------------------+--------------+--------------+--------------+
| 20" TV | STV20-KVR-HD | 097855008633 | Sony |
| 36" TV | STV36-KVR-HD | 087452047023 | Sony |
....
+------------------+--------------+--------------+--------------+
One way might be to do three separate queries, one for each word.
Then store them in an array and compare the overlaps, removing
any that aren't shared. Then a final query where product.id IN(array)
That seems extremely inefficient and hackish though.
I misunderstood what you meant at first.
So, you want rows where all words appear in the row, rather than where all words appear
in any one column. How about this: every time you get a match on a term in any column,
count it as 1. Then add all these and compare to the number of words in your search
input, which you can determine either in SQL with a little text wrangling, or probably
more easily in whatever the client code is with a split() or similar.
SELECT products.*, companies.name AS company_name, categories.name AS
category_name
FROM products
LEFT JOIN companies ON company_id = companies.id
LEFT JOIN categories ON category_id = categories.id
WHERE products.enabled = 1
AND(
(products.model LIKE 'sony%' + products.model LIKE '20%' products.model LIKE
'tv%')
+ (products.upc LIKE 'sony' + products.upc LIKE '20' +
products.upc LIKE 'tv')
+ (products.name LIKE '%sony%' + products.name LIKE '20%' + products.name LIKE
'%tv%')
+ (companies.name LIKE 'sony%' + companies.name LIKE '20%' + companies.name LIKE
'tv%')
+ (categories.name LIKE '%sony%' + categories.name LIKE '20%' + categories.name LIKE
'%tv%')
)
>= [$number_of_words_in_input]
ORDER BY categories.name DESC, products.name ASC, companies.name ASC;
This will be ugly and inefficient though. It might be better to build and maintain a
separate table with the concatenation of all the fields, and fulltext index that.
Baron
--
MySQL General Mailing List
For list archives: http://lists.mysql.com/mysql
To unsubscribe: http://lists.mysql.com/[EMAIL PROTECTED]
