Sphinx-按特定顺序对结果进行排序

Question

In Sphinx , I want to search for rows containing some keywords and sort them in a specific order.

For example, search for words like 'Dog', 'Cat', 'Lion' and sort in an order such that rows with 'Dog' will be listed first, followed by rows with 'Cat', and then with 'Lion'.

In Sphinx , searching will be easy with below query:

SELECT * FROM test_index WHERE MATCH('test_string "DOG" | "CAT" | "Lion"')

How can we sort the rows in a predefined order in Sphinx ?

Answer 1

You can order with predefined list in SQL .

Complete SQL:

SELECT * 
FROM   test_index 
WHERE  MATCH('test_string "DOG" | "CAT" | "Lion"') 
ORDER  BY CASE 
            WHEN field = 'DOG' THEN 0 
            WHEN field = 'CAT' THEN 1 
            WHEN field = 'Lion' THEN 2 
          end 

---

Yes Sphinx doesn't support ORDER BY CASE . If you want to short in predefined order you can use SPH_SORT_EXTENDED . Example in PHP is following:

$sph->SetSortMode(SPH_SORT_EXTENDED, "DOG, CAT, Lion");

Example:

Article.search "term", :sort_mode => :extended,
  :order => "Project ASC, Company ASC"

Source in detail

Answer 2

YOu can do something like

WHERE MATCH('test_string DOG | DOG | DOG | CAT | CAT | Lion')

Which means certain words will match multiple times. MIgh need to combine with a different ranking moder eg OPTION ranker=wordcount

---

Boost operator might also do something similar...

WHERE MATCH('test_string DOG^3 | CAT^2 | Lion')

(removed the quotes for brevity)