Slick 3.0 bulk insert or update (upsert)

what is the correct way to do a bulk insertOrUpdate in Slick 3.0?

I am using MySQL where the appropriate query would be

INSERT INTO table (a,b,c) VALUES (1,2,3),(4,5,6)
ON DUPLICATE KEY UPDATE c=VALUES(a)+VALUES(b);

MySQL bulk INSERT or UPDATE

Here is my current code which is very slow :-(

// FIXME -- this is slow but will stop repeats, an insertOrUpdate
// functions for a list would be much better
val rowsInserted = rows.map {
  row => await(run(TableQuery[FooTable].insertOrUpdate(row)))
}.sum

What I am looking for is the equivalent of

def insertOrUpdate(values: Iterable[U]): DriverAction[MultiInsertResult, NoStream, Effect.Write]

Solution

There are several ways that you can make this code faster (each one should be faster than the preceding ones, but it gets progressively less idiomatic-slick):

Run insertOrUpdateAll instead of insertOrUpdate if on slick-pg 0.16.1+
```
await(run(TableQuery[FooTable].insertOrUpdateAll rows)).sum
```

Run your DBIO events all at once, rather than waiting for each one to commit before you run the next:

val toBeInserted = rows.map { row => TableQuery[FooTable].insertOrUpdate(row) }
val inOneGo = DBIO.sequence(toBeInserted)
val dbioFuture = run(inOneGo)
// Optionally, you can add a `.transactionally`
// and / or `.withPinnedSession` here to pin all of these upserts
// to the same transaction / connection
// which *may* get you a little more speed:
// val dbioFuture = run(inOneGo.transactionally)
val rowsInserted = await(dbioFuture).sum

Drop down to the JDBC level and run your upsert all in one go (idea via this answer):

val SQL = """INSERT INTO table (a,b,c) VALUES (?, ?, ?)
ON DUPLICATE KEY UPDATE c=VALUES(a)+VALUES(b);"""

SimpleDBIO[List[Int]] { session =>
  val statement = session.connection.prepareStatement(SQL)
  rows.map { row =>
    statement.setInt(1, row.a)
    statement.setInt(2, row.b)
    statement.setInt(3, row.c)
    statement.addBatch()
  }
  statement.executeBatch()
}