SQLITE UPSERT UPDATE
Sqlite> INSERT INTO bar (key, fooID) SELECT 'key', foo.id FROM foo WHERE foo.name='two' ON CONFLICT (bar.key) DO UPDATE SET fooID=excluded.id
Sqlite> INSERT INTO bar (key, fooID) SELECT 'key', foo.id FROM foo WHERE foo.name='three' ON CONFLICT (bar.key) DO UPDATE SET fooID=excluded.id you can take a look at the database (quotes.db) using a SQLite client such as DB. The former appeared in an earlier version of Teradata than the latter. In later examples, we'll use dataset's upsert method to do so. Teradata offers a non-standard UPSERT (which they call 'UPSERT', or occasionally 'atomic UPSERT'), as well as SQL MERGE. I update a value to 5 within the ON CONFLICT DO UPDATE part of an UPSERT, but instead the value is set to NULL.This has something to do with the order in which generated columns are defined on the table. If you now consider insert followed by update, you get those two possibilities, and you also have to consider what happens when the delete falls between the insert and the update. For UPSERT, SQLite offers the shortened syntax OR instead of ON CONFLICT, but the behavior is the same. in the above contrived example if I go from using 'three' for foo.name to 'two' it updates fine, but if I then run again with 'three' it does not update. If upsert is truly atomic, at the end of the process, you will either have an updated record (the delete went first) or no record (the upsert went first). ON CONFLICT (key) DO UPDATE SET fooID=excluded.id īut it only sometimes seems to update the existing row, eg. SELECT 'key', foo.id FROM foo WHERE foo.name='three'
The latest stable version is available on NuGet. However, it can also be used independently or with other data access libraries. The Entity Framework Core provider for SQLite is built on top of this library. If I want to insert into a value into the table bar (here represented by the 'key' string, but in the real world it would be parameterized and this would be $1 and the 'three' would be $2) using the name field from foo I tried something like the following: INSERT INTO bar (key, fooID) is a lightweight ADO.NET provider for SQLite. INSERT INTO foo (name) VALUES ('one'), ('two'), ('three') įOREIGN KEY (fooID) REFERENCES foo(id) ON DELETE CASCADE, Assuming a database built with the following: PRAGMA foreign_keys = ON References: column-name-listexprindexed-column. The Sqlite upsert syntax can be found at Upsert.