That “operation” is not any kind of callback that we can handle and do some work. Pretty clear, but there is one caveat: this change doesn’t leave SQLite world. Triggers are database operations that are automatically performed when a specified database event occurs. If we try to speculate on the name “Trigger” we might say that probably something will be done when some changes are made to the database. As SQLite is very similar to SQL everyone already knows the basic concepts like querying, inserting, updating, deleting data databases and tables joining tables etc.īut SQLite also has some advanced features and this article is about one of such called Trigger. This is because it is used on almost all mobile devices in the world. In this tutorial, we have introduced you to the chinook SQLite sample database and showed you how to connect to it using the sqlite3 tool.SQLite Triggers (+ Android Room) January 17, 2020 tablesĬustomers invoice_items playlist_track Code language: SQL (Structured Query Language) ( sql ) tables to view all the tables available in the sample database. You should see the following command: sqlite> Code language: Shell Session ( shell ) c:\sqlite>sqlite3 c:\sqlite\db\chinook.db Code language: Shell Session ( shell ) ![]() Second, use the following command to connect to the chinook sample database located in the db folder, which is a subfolder of the sqlite folder. If you don’t have zip software installed, you can download a free zip software such as 7-zip.įirst, use the command line program and navigate to the SQLite directory where the sqlite3.exe file is located: c:\sqlite> Code language: Shell Session ( shell ) The sample database file is ZIP format, therefore, you need to extract it to a folder, for example, C:\sqlite\db. In case you want to have the database diagram for reference, you can download both black&white and color versions in PDF format.ĭownload SQLite sample database diagram with color How to connect to SQLite sample database You can download the SQLite sample database using the following link. The playlist_track table is used to reflect this relationship. The relationship between the playlists table and tracks table is many-to-many. Each track may belong to multiple playlists. playlists & playlist_track tables: playlists table store data about playlists.tracks table stores the data of songs.genres table stores music types such as rock, jazz, metal, etc.media_types table stores media types such as MPEG audio and AAC audio files.However, one artist may have multiple albums. albums table stores data about a list of tracks. ![]() It is a simple table that contains only the artist id and name. The invoices table stores invoice header data and the invoice_items table stores the invoice line items data.
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