Question

我想在第二个查询中插入第一个查询的结果，我需要知道如何在Cassandra查询语言中多插入值。请赐教。

def daomethod(seconditemtable:SecondItemTable):java.util.List[Row]={

    val query=session.execute("select item from itemtable").all()     //first query

    val queryvalue=query.map(x=>x.getString("item")).toList.distinct   //List(item1,item2,item3)


    val secondquery="select * from seconditemtable where entity=? and item=? and date>=? and date<=?"  //second  query

    val statement=session.prepare(secondquery)

    val boundstatement= new Boundstatement(statement)

    session.execute(boundstatement.bind(seconditemtable.entity,queryvalue,seconditemtable.date,seconditemtable.date)).all()     //how to insert multiple value of firstquery in item column
}

提前致谢

Answer 1

你可以尝试类似的东西

val secondquery=s"select * from seconditemtable where entity=? and item in (${queryvalue.mkString(",")}) and date>=? and date<=?"

在语句中利用cql。关于它的更多细节https://docs.datastax.com/en/cql/3.3/cql/cql_reference/select_r.html

在cql中为scala多插入

1 个答案: