在Slick 3.0中执行批量insertOrUpdate的正确方法是什么?
我正在使用适当的查询的MySQL
INSERT INTO table (a,b,c) VALUES (1,2,3),(4,5,6) ON DUPLICATE KEY UPDATE c=VALUES(a)+VALUES(b);
MySQL批量插入或更新
这是我当前的代码,它很慢:-(
// 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
我正在寻找的是等价的
def insertOrUpdate(values: Iterable[U]): DriverAction[MultiInsertResult, NoStream, Effect.Write]
您可以通过多种方法使此代码更快(每个代码都 应该 比前面的代码更快,但是它的习惯用法越来越少):
运行insertOrUpdateAll而不是insertOrUpdateif on slick-pg 0.16.1+
insertOrUpdateAll
insertOrUpdate
await(run(TableQuery[FooTable].insertOrUpdateAll rows)).sum
一次运行所有DBIO事件,而不是在运行下一个事件之前等待每个事件:
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
.transactionally
.withPinnedSession
下降到JDBC级别,并一口气运行您的upsert(通过此答案的想法):
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() }