Currently working on an ASP.Net MVC 4 application using Entity Framework 5. Used CodeFirst for the initial development phase. But have now disabled the Automatic Migrations and designing new tables directly using SSMS and writing POCO. Everything is working good.
Recently, identified a weird issue in Production. The records in one of the initially designed tables skipped auto-increment identity value by more than 900 numbers. This has happened 3 times within the last 3 months. Debugged the application locally but could not reproduce. There isn't any pattern or trend observed.
Model:
public class Enquiry
{
[Key]
[DatabaseGeneratedAttribute(DatabaseGeneratedOption.Identity)]
public Int64 EnquiryId { get; set; }
[Required]
public int UserId { get; set; }
[Required]
public byte Bid { get; set; }
...
[Required]
public DateTime Created { get; set; }
[Required]
public DateTime Modified { get; set; }
}
public class EnquiryDetail
{
[Key]
public Int64 EnquiryId { get; set; }
[Required]
public int CreditScore { get; set; }
[Required]
public byte BidMode { get; set; }
public virtual Enquiry Enquiry { get; set; }
}
DBContext:
public class EscrowDb : DbContext
{
public EscrowDb()
: base("name=DefaultConnection")
{
}
public DbSet<Enquiry> Enquiries { get; set; }
public DbSet<EnquiryDetail> EnquiryDetails { get; set; }
protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
modelBuilder.Conventions.Remove<PluralizingTableNameConvention>();
modelBuilder.Entity<EnquiryDetail>()
.HasRequired<Enquiry>(ed => ed.Enquiry)
.WithRequiredDependent(e => e.EnquiryDetail);
}
}
Controller:
[Authorize]
public class EnquiryController : Controller
{
private EscrowDb _db = new EscrowDb();
[HttpPost]
[ValidateAntiForgeryToken]
public ActionResult Create(EnquiryViewModel core)
{
var enquiry = new Enquiry();
// Some code to set properties using passed ViewModel
...
var enquiryDetail = new EnquiryDetail();
// Some code to set properties using passed ViewModel
...
enquiry.EnquiryDetail = enquiryDetail;
_db.Enquiries.Add(enquiry);
_db.SaveChanges();
}
}
All this code has been working fine so far except the identity value getting skipped sporadically by large gaps of almost 1000 numbers.
Has anybody come across such kind of issue? Please share your thoughts.
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