c# – 从数据库中选择不在大型集合中的id,提供的参数太多

我正在开发一个有两个数据库的应用程序.

我有一个对象,让我们称之为permit,它有一个id引用表的id列表,让我们在另一个数据库中调用那些任务.

我正在尝试运行以下查询：

var listOfUsedIds = select taskid from Permit_Task;
Select * from task where id not in (listOfUsedIds)

当我运行此代码时,我收到错误：

The incoming tabular data stream (TDS) remote procedure call (RPC)
protocol stream is incorrect.
Too many parameters were provided in this RPC request. The maximum
is 2100.

我无法运行子选择或任何事情因为NHibernate不允许我在两个数据库上执行此操作.

任何人都可以帮我解决这个问题吗？

解决方法:

using (var tx = session.BeginTransaction())
{
    session.CreateSQLQuery("CREATE TEMP TABLE usedIds (id INT)").ExecuteUpdate();

    for (int index = 0; index < ids.Length; index++)
    {
        // TODO: batch this
        session.CreateSQLQuery("INSERT INTO usedIds VALUES (:p" + index + ")")
            .SetParameter("p" + index, id)
            .ExecuteUpdate();
    }

    session.CreateSQLQuery("CREATE INDEX usedIds_idx ON usedIds (id)").ExecuteUpdate();


    Batch batch;
    while((batch.List = session.CreateSQLQuery("SELECT id FROM tasks t WHERE 1 = (SELECT COUNT(*) FROM usedIds u WHERE u.id = t.id) LIMIT 10 OFFSET " + batch.Number).List<int>()).Count > 0)

    {
        var tasks = session.QueryOver<Task>()
            .Where(t => t.Id.IsIn(batch))
            .List();
        // Do something with the tasks
    }
    tx.Commit();
}

要么

public TaskMap()
{

    Map(x => x.IsUsedCount).Formula("SELECT (SELECT COUNT(*) FROM usedIds u WHERE u.Id = Id)").LazyLoad();
}

var tasks = session.QueryOver<Task>()
    .Where(t => t.IsUsedCount == 0)
    .List();

标签：c,sql-server,nhibernate,multiple-databases
来源： https://codeday.me/bug/20190709/1418363.html