SQLite3 “forgets” to use foreign keys

Question

I\'m using Ruby with SQLite3 and my attempts to use foreign keys in Sqlite3 were unfortunately not successful. According to sqlite3 --version, version 3.7.13 is

Answer 1

Put this at the top of the file that executes the SQL commands and it will enable foreign keys on runtime.

db = SQLite3::Database.new("database.db")
db.execute("PRAGMA foreign_keys = ON")

Answer 2

I think I can answer my own question: The documentation says: Foreign key constraints are disabled by default (for backwards compatibility), so must be enabled for each database connection separately. Annoying, but it's finally working now.

Answer 3

One way of permanently turning on foreign_keys by default is to inject the following line into ~/.sqliterc:

PRAGMA foreign_keys = ON;

Please note that it will affect all your databases...