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OnPropertyChange as an Alternative to Triggers in Entity Framework


OnPropertyChange as an Alternative to Triggers in Entity Framework

By : Michael Andrew Balmf
Date : January 02 2021, 06:48 AM
To fix this issue Triggers occur whenever an action happens on the database table itself. If you perform an update and have an update trigger, this will happen regardless of whether you use Entity Framework or write an update statement directly against that table. Here is a reference on SQL Server Triggers.
EDIT If you want custom business logic to occur that either pertains or doesn't pertain to the database you can do the following:
code :


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Replace T-SQL triggers with Entity Framework 4.0 code?

Replace T-SQL triggers with Entity Framework 4.0 code?


By : newbie
Date : March 29 2020, 07:55 AM
To fix this issue There is a partial method OnContextCreated that can be used to hook up to the SavingChanges event. Newer versions also do have built in support for this type of thing. However you can override the SaveChanges method in DbContext.
code :
public partial class MyContext
{
    partial void OnContextCreated()
    {
        SavingChanges += OnSavingChanges;
    }

    private void OnSavingChanges(object sender, EventArgs eventArgs)
    {
        var myEntities = ObjectStateManager.GetObjectStateEntries(EntityState.Deleted)
            .Where(e => e.Entity is MyEntity)
            .Select(e => e.Entity).Cast<MyEntity>();
    }
}
Entity Framework with Instead Of triggers

Entity Framework with Instead Of triggers


By : Prot
Date : March 29 2020, 07:55 AM
Any of those help If you open EDMX file with an xml editor, in the section where TargetView is defined you will have some xml similar to the following;
code :
<EntitySet Name=".."  
           EntityType=".." 
           store:Type="Views" 
           store:Schema=".." 
           store:Name="..">
<DefiningQuery>SELECT ....</DefiningQuery>
<EntitySet Name=".."  
           EntityType=".."  
           store:Type="Tables" 
           Schema=".." />
SQLite temporary tables/triggers and Microsoft's Entity Framework

SQLite temporary tables/triggers and Microsoft's Entity Framework


By : argentum97
Date : March 29 2020, 07:55 AM
should help you out The System.Data.Entity.Database object opens and closes the connection as it deems appropriate. In the way I was using ExecuteSqlCommand, it will open and close the connection for each command. So temporary tables will be discarded as soon as they are created.
Manually opening and closing Database.Connection won't work because of an apparent problem in the DbContext class. However, the internal ObjectContext object can do the job.
code :
(dbContext as IObjectContextAdapter).ObjectContext.Connection.Open();

using (TransactionScope scope = new TransactionScope(TransactionScopeOption.Required))
    {
        // perform a list of queries
        // The connection will not close!
        scope.Complete();
        (dbContext as IObjectContextAdapter).ObjectContext.Connection.Close();
    }
What triggers Entity Framework to fix up a navigation property?

What triggers Entity Framework to fix up a navigation property?


By : dereece115
Date : March 29 2020, 07:55 AM
it fixes the issue You're right. DetectChanges is the method that triggers relationship fix-up. If you want relationship fix-up to happen for whatever reason, you call DetectChanges.
But DetectChanges is also called by EF itself when you execute the following methods:
Entity Framework 6 Oracle Migration Alternative for System.Data.Entity.SqlServer.SqlFunctions

Entity Framework 6 Oracle Migration Alternative for System.Data.Entity.SqlServer.SqlFunctions


By : Leonardo Henrique
Date : March 29 2020, 07:55 AM
this will help We have application which should work on both sql server and oracle.we have used Sql functions in all over application. now we are migrating to oracle. below are Sql Functions that we used.
code :
System.Data.Entity.DbFunctions  this is the alternative for above functions except replicate() and StringConvert() function
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