Here’s an example of what I mean: SELECT * FROM Artist If I hadn’t used the wildcard character, I wouldn’t have gotten any results. The percentage sign is a wildcard character that matches zero or more of any character (including spaces). In this case I wanted to return all artists whose name’s start with Black. Here’s a basic example that uses the LIKE operator in a WHERE clause. You can also use it to return a boolean value. However, adding it to the WHERE clause isn’t the only way you can use the LIKE operator.
#SQLITE LIKE FULL#
Although SQLite might not be a good solution for large project, but it is good enough for small project that want to do full text search but don't want to go to extra length to setup a full blown full text search engine.In SQLite, you can use the LIKE operator in your queries to do a pattern matching comparison.įor example, you can add it to your WHERE clause in order to return only rows that match a given pattern. I hope this article will be useful for you. (0.4ms) SELECT DISTINCT "animes"."title", "animes"."titles" FROM "animes" INNER JOIN "fts_animes" ON "fts_animes"."anime_id" = "animes"."id" WHERE (fts_animes.title MATCH '^sword') pry(main)> arch('^sword').pluck(:title, :titles) (0.3ms) SELECT COUNT(DISTINCT "animes"."id") FROM "animes" INNER JOIN "fts_animes" ON "fts_animes"."anime_id" = "animes"."id" WHERE (fts_animes.title MATCH '^sword')
This time only 7 result matched, Momo Kyun Sword, Thunderbolt Fantasy and Ken En Ken: Aoki Kagayaki has the term but it doesn't appear at the beginning so it didn't return. Now lets try for anime title that contains the term 'sword' but only appear at the start. "Sword Oratoria: Is it Wrong to Try to Pick Up Girls in a Dungeon? On the Side", "Dungeon ni Deai wo Motomeru no wa Machigatteiru Darou ka Gaiden: Sword Oratoria", ["Sword Oratoria: Is it Wrong to Try to Pick Up Girls in a Dungeon? On the Side", ["Dungeon ni Deai wo Motomeru no wa Machigatteiru Darou ka Gaiden: Sword Oratoria", (0.4ms) SELECT DISTINCT "animes"."title", "animes"."titles" FROM "animes" INNER JOIN "fts_animes" ON "fts_animes"."anime_id" = "animes"."id" WHERE (fts_animes.title MATCH 'sword') pry(main)> arch('sword').pluck(:title, :titles) (2.6ms) SELECT COUNT(DISTINCT "animes"."id") FROM "animes" INNER JOIN "fts_animes" ON "fts_animes"."anime_id" = "animes"."id" WHERE (fts_animes.title MATCH 'sword') There are 10 result matched the 9th result doesn't have the term 'sword' in title column, but it was in alias titles so it also match. With this we are now be able to perform full text search for a certain anime title.įirst lets try for anime title that contains the term 'sword'.
#SQLITE LIKE CODE#
where ( 'fts_animes.title MATCH ?', text ) end # rest of the code end # app/models/anime.rb class Anime do self. $ rails g model Anime title:string desc:text titles:text We want to be able to search on both title and titles so these column will be used as index in our virtual table. Because an anime can have multiple titles I decided to store them as serializable array.
Lets create an anime model that we can use for our demo project. Next create a new rails project using SQLite database $ rails new demo -T If you haven't already got one you can do so with the following.
#SQLITE LIKE INSTALL#
Setting Upīefore we begin make sure you have SQLite with FTS module enabled install on your machine.
#SQLITE LIKE HOW TO#
I'll walk you through how to setup a virtual table module in SQLite, create a table, indexing our data and finally integrate it with ActiveRecord. In this article we will look at another tool that we can achive similar effect and that is by using FTS virtual table. When it comes to full text search there are many ways that one can achive it, by using SQL LIKE query, Elasticsearch or Solr for example.
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