I am trying to use computed column in my project, but I am facing the some error.
Column 'inserted.TotalMarks' cannot be referenced in the OUTPUT clause because the column definition contains a subquery or references a function that performs user or system data access. A function is assumed by default to perform data access if it is not schemabound. Consider removing the subquery or function from the column definition or removing the column from the OUTPUT clause.
Model
public partial class LMS_SurveyUser
{
public LMS_SurveyUser()
{
}
[Key]
public int SurveyUserID { get; set; }
public int SurveyID { get; set; }
public int UserID { get; set; }
public bool? IsCompleted { get; set; }
public DateTime? ExpiryDate { get; set; }
public int? MarksObtained { get; set; }
[DatabaseGenerated(DatabaseGeneratedOption.Computed)]
public int? TotalMarks { get; set; }
public int LastPageAccessed { get; set; }
public int? WhoCreated { get; set; }
public DateTime? WhenCreated { get; set; }
public int? WhoModified { get; set; }
public DateTime? WhenModified { get; set; }
}
While creating the record with above mentioned it does not gives any error, but if I try to update the existing record then it gives the above mentioned error.
I have configured SQL function in the database for column 'TotalMarks'. I have tried with the fluent mapping also, but it gives the same error.
And in the 'TotalMarks' computed column specification I write this formula:
([dbo].[LMSFN_CalculateTotalMark]([SurveyID],[UserID]))
I am inserting/updating record like below,
Inserting Record
public void InsertSurveyUserDetails(LMS_SurveyUser model)
{
dbcontext.Add(model);
dbcontext.SaveChanges();
}
Updating Record
public void UpdateSurveyUserDetails(LMS_SurveyUser model)
{
dbcontext.Update(model);
dbcontext.SaveChanges();
}
Any help on this appreciated !
Related
When I do an insert using EF6, I get this error
The column name 'employee_id' is specified more than once in the SET clause. A column cannot be assigned more than one value in the same SET clause. Modify the SET clause to make sure that a column is updated only once. If the SET clause updates columns of a view, then the column name 'employee_id' may appear twice in the view definition
My models looked like this:
public class Entity
{
public Entity()
{
IsActive = true;
IsDeleted = false;
DateCreated = DateTime.Now;
}
[Key, DatabaseGenerated(DatabaseGeneratedOption.Identity)]
public long ID { get; set; }
public int CompanyID { get; set; }
public int SubID { get; set; }
public DateTime DateCreated { get; set; }
public bool IsTransient()
{
return EqualityComparer<long>.Default.Equals(ID, default(long));
}
public bool IsDeleted { get; set; }
public bool IsActive { get; set; }
}
public partial class NextOfKin : Entity
{
[Required]
public long employee_id { get; set; }
[StringLength(100)]
[Required]
public string nok_first_name { get; set; }
[StringLength(100)]
[Required]
public string nok_last_name { get; set; }
[StringLength(300)]
[Required]
public string nok_address { get; set; }
[StringLength(100)]
public string nok_email { get; set; }
[StringLength(100)]
public string nok_phone { get; set; }
[StringLength(100)]
public string nok_employer { get; set; }
[StringLength(300)]
public string nok_work_address { get; set; }
[StringLength(100)]
[Required]
public string nok_relationship { get; set; }
public virtual Employee Employee { get; set; }
}
public class Employee : Entity
{
//Person Records
public long UserId { get; set; }
public int TitleId { get; set; }
public int? ReligionId { get; set; }
public string SerialNo { get; set; }
[StringLength(100)]
[Required]
public string FirstName { get; set; }
[StringLength(100)]
[Required]
public string LastName { get; set; }
}
My insert code into next of kin was like this.
NextOfKin nextOfKin = new NextOfKin();
nextOfKin.employee_id = newEmployee.ID;
nextOfKin.nok_first_name = "Friday";
nextOfKin.nok_last_name = "Ben";
nextOfKin.nok_address = "XXX";
nextOfKin.nok_email = "xa#xo.com";
nextOfKin.nok_phone = "023938494";
nextOfKin.nok_employer = "50 Queens Street";
nextOfKin.nok_work_address = "51 Queens Street";
nextOfKin.nok_relationship = "Neighbour";
db.NextOfKins.Add(nextOfKin);
db.SaveChanges();
I got an error like this using EF Core
'PropertyNameID' is specified more than once in the SET clause or
column list of an INSERT. A column cannot be assigned more than one
value in the same clause. Modify the clause to make sure that a column
is updated only once. If this statement updates or inserts columns
into a view, column aliasing can conceal the duplication in your code.
It turned out that I had the case wrong in my relatonship
In My business object I had the foreign key set with the wrong case.
public int PropertyNameID { get; set; }
[ForeignKey("PropertyNameId")] public virtual PropertyNameExt PropertyName { get; set; }
Should have been
[ForeignKey("PropertyNameID")] public virtual PropertyNameExt PropertyName { get; set; }
To fix this, remove the relationship on next of kin model, then do migration.
To remove, remove public virtual Employee Employee { get; set; } from NextOfKin model.
The reason for this issue is as follow:
Relationships are only created properly if you name the reference property properly. In this case you should use EmployeeID instead of employee_id for the relationship between next of kin and employee.
The Employee model does not have a link back to the next of kin model. If it's a one to many you can add the property below to the Employee model.
public virtual List NextOfKins{get; set;} //if you need lazy loading
or
public List NextOfKins{get; set;} //if you don't need lazy loading
I made a view in SQL server and then added to to my edmx file in visual studio 2012 I then went to POST it on Postman and got this runtime error.
Unable to update the EntitySet 'ViewPatient' because it has a DefiningQuery and no <InsertFunction> element exists in the <ModificationFunctionMapping> element to support the current operation.
//Controller action code namespace MvcWebAPI.Models
{
using System;
using System.Collections.Generic;
public partial class ViewPatient
{
public int PatientID { get; set; }
public int MedicationID { get; set; }
public int GPID { get; set; }
public string Firstname { get; set; }
public string Surname { get; set; }
public System.DateTime DOB { get; set; }
public string Medication { get; set; }
public string Alergies { get; set; }
public string MedicationHistory { get; set; }
}
}
You need a primary key on the view. http://blogs.msdn.com/b/alexj/archive/2009/09/01/tip-34-how-to-work-with-updatable-views.aspx
I write chat in C# with Entity Framework
This is my code
public class User
{
[Key]
public long id { get; set; }
public List<UserMessages> userMessages { get; set; }
}
public class UserMessages
{
[Key]
public long Id { get; set; }
public long ChatMateId { get; set; }
public string text { get; set; }
public DateTime? dateTime { get; set; }
}
Entity Framework code-first forced me to put on the Id field in UserMessages class attribute [Key] , I don't need this field at all because UserMessages is weak entity that will point to id of User
Can I delete long Id from sql table after ef create the table, without any problems?
No, you can't. EF requires that all tables have a [Key] on them, or it will blow up. Even when mapping to SQL Views (as I've learned the hard way, believe me).
In your case, you should actually be using a proper Foreign Key in that table also, like so:
public class UserMessages
{
[Key]
public long Id { get; set; }
[ForeignKey("User")]
public long UserId { get; set; }
public long ChatMateId { get; set; }
public string text { get; set; }
public DateTime? dateTime { get; set; }
public User User { get; set; }
}
public class Employee {
[Key]
public int Id { get; set; }
public string Name { get; set; }
public string Address { get; set; }
public decimal Salary { get; set; }
public string Email { get; set; }
}
public class EmployeeContext : DbContext
{
public DbSet<Employee> Employees { get; set; }
}
When I'm adding Data Annotation [Required(ErrorMessage = "Employee Name is required")] to the Name property it's throwing an InvalidOperationException. As I was trying to fix the bug I'm getting these suggestions online:
It means one of your classes use in the EmployeeContext has changed, but the database hasn't been updated so is now out of date. You need to update this use Code First migrations.
When I'm making the following changes its throwing an error now
public class Employee {
[Key]
public int Id { get; set; }
[DisplayName("Employee Name")]
[Required(ErrorMessage = "Employee Name is required")]
[StringLength(35)]
public string Name { get; set; }
public string Address { get; set; }
public decimal Salary { get; set; }
public string Email { get; set; }
}
Snapshot:
Questions:
If a Database Table is created is it possible to change a column ?
When adding a Data Annotation Attribute it's throwing an Exception, why is the database table column not changing ?
Addicted to your tutorials now
User Migration for update database structure
Without [Required] filed Name allow null (varchar(x) null), with [Required] Name change not null (varchar(x) not null)
If in database threre are rows with nullable Name, can be error on update (with migration)
I am very new to EF 4.1. I am getting the error in my Code First development in EF 4.1.
"Cannot insert explicit value for identity column in table 'table' when IDENTITY_INSERT is set to OFF."
I searched in internet and understood abt the usage of the
[Required, Key, DatabaseGenerated(DatabaseGeneratedOption.Identity)].
But no use. I changed the option from Identity to None also. But no use.
You are trying to insert a new row into a table with an auto increment PK, you shouldnt be setting the ID property here when you try and add it to the DB.
I had this same error because I had defined a foreign key relationship the wrong way in my classes:
public partial class Student
{
[Key]
public int StudentId { get; set; }
public string StudentName { get; set; }
public int StudentAge { get; set; }
public int GradeNumber { get; set; }
public string LockerNumber { get; set; }
public string TeacherID { get; set; }
public string StudentComments { get; set; }
// Navigation properties
[ForeignKey("TeacherID")]
public virtual Teacher Teacher { get; set; }
public virtual GradeLevel GradeLevel { get; set; }
// the code below is incorrect, the StudentClass should have the StudentId
// as the FK entity:
[ForeignKey("StudentId")]
public virtual StudentClass StudentClass { get; set; }
}
The StudentClass class
public partial class StudentClass
{
[Key]
public int RowId { get; set; }
public int StudentId { get; set; }
public int ClassSubjectId { get; set; }
// Navigation properties
[ForeignKey("ClassSubjectId")]
public virtual ClassSubject ClassSubject { get; set; }
// this is the way the relationship should be defined:
[ForeignKey("StudentId")]
public virtual Student Student { get; set; }
}