mysql - Slick 3.0批量插入或更新(upsert)

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 bulk INSERT or UPDATE

这是我当前的代码，它非常慢:-(

// 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

我正在寻找的是相当于

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

最佳答案

有几种方法可以使此代码更快(每个代码都应该比前面的代码快，但是它的习惯用法越来越少):

如果在slick-pg 0.16.1+上运行insertOrUpdateAll而不是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

下降到JDBC级别并一次运行所有upsert(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()
}

关于mysql - Slick 3.0批量插入或更新(upsert)，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/35001493/