我正在使用LINQ to SQL,我有一个名为“tblCourse”的表我想根据某些条件从该表中选择一些行,然后将这些选定的行作为新记录插入到同一个表中。任何机构都可以建议一些帖子,链接或方向吗?
public IQueryable<tblCourseNeededHours> CloneAllCourseNeededHoursInDepartmentInSemester(int departmentId, string semester)
{
return from allCourses in _db.tblCourseNeededHours orderby allCourses.tblCourse.CourseName
where allCourses.tblCourse.tblInstitute.DepartmentID == departmentId && allCourses.Semester
== semester select allCourses;
var thisTable = from t in _db.tblCourseNeededHours where
t.tblCourse.tblInstitute.DepartmentID == departmentId && t.Semester == semester
//select everything except ID
select _db.tblCourseNeededHours { Semester = ?, NeedHoursPerWeek = ?, AssignToInstitute=?
(I want it null for new record), Freezed=? (I want it null for new record)
};
_db.tblCourseNeededHours.InsertAllOnsubmit(thisTable);
_db.SubmitChanges();
现在我使用
select _db.tblCourseNeededHours { Semester = ?, NeedHoursPerWeek = ?, AssignToInstitute=? (I want it null), Freezed=? (I want it null)
};
?提到“我应该放在这里,我在这里有错误,也在这一行
_db.tblCourseNeededHours.InsertAllOnsubmit(thisTable);
答案 0 :(得分:0)
我不确定你的数据库模式,但是这样的事情对你有用。
var oldItems= (from p on db.tblCourses where p.InstructorId=43 select p).ToList();
if(oldItems!=null)
{
foreach(var item in oldItems)
{
tblCourse objNew=new tblCourse();
objNew.Instructor="John";
// update someproperty values from old row if you need
objNew.Credits=item.Credits+2;
db.tblCourses.Add(objNew);
}
db.SubmitChanges();
}
假设db是你的datacontext