Option to ignore inserts if primary key exists already

[simonw]

I've just noticed that SQLite lets you IGNORE inserts that collide with a pre-existing key. This can be quite handy if you have a dataset that keeps changing in part, and you don't want to upsert and replace pre-existing PK rows but you do want to ignore collisions to existing PK rows.

Do sqlite_utils support such (cavalier!) behaviour?

Originally posted by @psychemedia in #18 (comment)

[simonw]

I think this can be implemented as an --ignore option to sqlite-utils insert

[simonw]

https://www.sqlite.org/lang_insert.html

Looks like it's as simple as INSERT OR IGNORE - and we already have code related to that here:

sqlite-utils/sqlite_utils/db.py

Lines 498 to 501 in 1e28eee

	sql = """
	INSERT {upsert} INTO [{table}] ({columns}) VALUES {rows};
	""".format(
	upsert="OR REPLACE" if upsert else "",

[simonw]

Shipped this feature in sqlite-utils 1.1: https://sqlite-utils.readthedocs.io/en/latest/changelog.html#v1-1