在 MVC 中将 EntityFramework 转换为原始 SQL 查询

Question

我正在尝试在我的 .net 中制作一个粗略的日历，我的问题是，如何将以下实体框架代码制作为 SQL 查询？

[HttpPost]

public JsonResult SaveEvent(Event e)

{

var status = false;
using (MyDatabaseEntities dc = new MyDatabaseEntities())
{
    if (e.EventID > 0)
    {
        //Update the event
        var v = dc.Events.Where(a => a.EventID == e.EventID).FirstOrDefault();
        if (v != null)
        {
            v.Subject = e.Subject;
            v.Start = e.Start;
            v.End = e.End;
            v.Description = e.Description;
            v.IsFullDay = e.IsFullDay;
            v.ThemeColor = e.ThemeColor;
        }
    }
    else
    {
        dc.Events.Add(e);
    }
    dc.SaveChanges();
    status = true;
}

return new JsonResult { Data = new { status = status } };

}

http://www.dotnetawesome.com/2017/07/curd-operation-on-fullcalendar-in-aspnet-mvc.html

谢谢大家

Answer 1

您可以使用dc.Database.ExecuteSqlCommand() 命令在实体框架中运行原始查询，如下所示：

var status = false;
using (MyDatabaseEntities dc = new MyDatabaseEntities())
{
    if (e.EventID > 0)
    {
        dc.Database.ExecuteSqlCommand(&@"
        UPDATE Events 
        SET Subject = {e.Subject},
        Start = {e.Start},
        End = {End},
        Description = {Description},
        IsFullDay = {IsFullDay},
        ThemeColor = {ThemeColor},
        WHERE EventID = {e.EventID}

        IF @@ROWCOUNT = 0
        INSERT INTO Events (EventID, Subject, Start, End, Description, IsFullDay, ThemeColor)
        VALUES ({e.EventID}, {e.Subject}, ...)
        ");

        status = true;
    }

    return new JsonResult { Data = new { status = status } 
};