I have my core project in C#.
I work on a database, where some tables have the columns "user_mod" and "date_mod" for sign who and when made some mods and the same with "data_new" and "user_new".
My question: is there a way to centralize this and make this data inserted automatically, where I create the instance of dbContext
?
If not, I will use an audit trail tool. I have seen some of these, but there is a problem: all of these, require some code in my model. But I don't want to write in my model, because if I have to change it, I will lost the mods. Is it possible use an audit trail for EF6 without writing in the model file(s)? How?
EDIT:
My attempt to override the saveChanges.
public partial class PieEntities : DbContext
{
public override int SaveChanges(System.Data.Objects.SaveOptions options)
{
var timestamp = DateTime.Now;
EntityState es = EntityState.Added;
ObjectStateManager o = new ObjectStateManager();
foreach (ObjectStateEntry entry in o.GetObjectStateEntries(EntityState.Added )) {
if (entry.Entity.GetType() == typeof(TabImpianti)) {
TabImpianti impianto = entry.Entity as TabImpianti;
impianto.DATA_INS = timestamp;
impianto.DATA_MOD = timestamp;
string u = mdlImpostazioni.p.UserName;
impianto.USER_INS = u;
impianto.USER_MOD = u;
}
}
return base.SaveChanges(options);
}
}
UPDATE: I've summarized the solution here.
If using EF6's DbContext
you can use ChangeTracker
in SaveChanges
override to find added/modified entities of custom type, for example IAuditedEntity.
public interface IAuditedEntity {
string CreatedBy { get; set; }
DateTime CreatedAt { get; set; }
string LastModifiedBy { get; set; }
DateTime LastModifiedAt { get; set; }
}
public override int SaveChanges() {
var addedAuditedEntities = ChangeTracker.Entries<IAuditedEntity>()
.Where(p => p.State == EntityState.Added)
.Select(p => p.Entity);
var modifiedAuditedEntities = ChangeTracker.Entries<IAuditedEntity>()
.Where(p => p.State == EntityState.Modified)
.Select(p => p.Entity);
var now = DateTime.UtcNow;
foreach (var added in addedAuditedEntities) {
added.CreatedAt = now;
added.LastModifiedAt = now;
}
foreach (var modified in modifiedAuditedEntities) {
modified.LastModifiedAt = now;
}
return base.SaveChanges();
}