Question

我有两个表，我有一个按钮控件，当我点击table2中的记录添加到table1的按钮时，该记录必须在table2中删除。我写的像

public ActionResult Accept( int id, string selectedVal)                         //To update Accept status
        {
            var retrieveID = (from i in dbContext.groups
                              where i.groups_name == selectedVal
                              select new { groups_id = i.Usr_contacts_groups_id }).FirstOrDefault();

          var currentId = 1;
            var deleteQuery = dbContext.requests.Where(i => i.from_usr_id == id && i.to_usr_id == id).FirstOrDefault();

            contact contactGroup = new contact();

            contactGroup.groups_id = retrieveID.groups_id;
            contactGroup.groups_usr_id = currentId;



            this.dbContext.Add(contactGroup);
            this.dbContext.Delete(deleteQuery);
            try
            {
                this.dbContext.SaveChanges();

            }
            catch
            {
                return View();
            }
            return Json(null);
        }

我能够在table1中添加记录并删除table2中的多个记录，并在删除查询中使用“id”值。

Answer 1

table2中的记录添加到table1，该记录必须在table2中删除

我将用简单的英语假设：

table2中的记录应添加到table1中，然后从table2中删除

换句话说，将记录从table1移至table2，对吗？ （我们假设它是）

public ActionResult MoveRecord(int id) {

    // get Table 2 record
    var recordA = dbContext.table2.FirstOrDefault(x => x.bioId == id);

    // if we did find a record
    if (recordA != null) {

        // let's add it into Table 1
        var recordB = new Table2();
        recordB.id = recordA.id;
        recordB.value = recordA.value;

        // add to database
        dbContext.table1.AddObject(recordB);

        // now that we have it in the database, let's delete the original on
        dbContext.table2.DeleteObject(recordA);

        // save all changes
        dbContext.SaveChanges();
    }


    return RedirectToAction("Index");
}

如何一次编写添加和删除操作的查询

1 个答案: