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ENTITY-FRAMEWORK QUESTIONS

How do I avoid loading all child records with the actual table
How do I avoid loading all child records with the actual table
To fix the issue you can do You can disable lazy loading, in your Jobs model remove virtual from children that you don't want to load.if you want to disable it permanently you must disable it globally more info here
TAG : entity-framework
Date : January 11 2021, 03:34 PM , By : user3099763
Copying a table in Entity Framework
Copying a table in Entity Framework
like below fixes the issue I suggest using raw sql in EntityFrameworkCore to accomplish what you need.
TAG : entity-framework
Date : January 08 2021, 10:52 AM , By : user3097341
Can we set dynamically the Command TimeOut by on query execution time in entity framework?
Can we set dynamically the Command TimeOut by on query execution time in entity framework?
wish help you to fix your issue Can we set dynamically the Command TimeOut is "Time of the query execution" in entity framework? , This way:
TAG : entity-framework
Date : January 08 2021, 03:18 AM , By : user3097089
Entity Framework: Left Join with List Result
Entity Framework: Left Join with List Result
help you fix your problem Shortly, it's not possible (and I don't think it ever will be). If you really want to control the exact server calls, EF Core is simply not for you. While EF Core still has issues with some LINQ query translation which leads
TAG : entity-framework
Date : January 02 2021, 06:48 AM , By : Walter Christie
One-way One to Many relationship using part of a composite key
One-way One to Many relationship using part of a composite key
With these it helps The foreign key on the second table must match the PK on the first.For example, using Int for the key type for simplicity.
TAG : entity-framework
Date : January 02 2021, 06:48 AM , By : Learner
How to add entity object to adequate entity set with object context in EF?
How to add entity object to adequate entity set with object context in EF?
I think the issue was by ths following , If you add an object to your ObjectContext and want to retrieve it without querying the database, you can use ObjectContext.GetObjectByKey.Your second question is unclear to me.
TAG : entity-framework
Date : January 02 2021, 06:48 AM , By : user3862815
"like" queries in Entity Framework
"like" queries in Entity Framework
fixed the issue. Will look into that further This guy made a very nice "WhereLike" extension for Linq that accepts any wildcard character and compares two values (one of which comes from an expression) with a generic method derived from the location
TAG : entity-framework
Date : January 02 2021, 06:48 AM , By : vishnu
How to delete an object by id with entity framework
How to delete an object by id with entity framework
this will help It seems to me that I have to retrieve an object before I delete it with entity framework like below , In Entity Framework 6 the delete action is Remove. Here is an example
TAG : entity-framework
Date : January 02 2021, 06:48 AM , By : user3856356
How to retrieve base class only (entity framework)?
How to retrieve base class only (entity framework)?
may help you . Yes this is a little tricky.But I did a tip on this a while back
TAG : entity-framework
Date : January 02 2021, 06:48 AM , By : Mill3niumThr33
Trying to migrate tables in code for .net core
Trying to migrate tables in code for .net core
I wish this helpful for you I am not happy with the solution....But what I have done is just follow the normal way of doing things. So first of all, mapping any AspNetIdentity tables as I see fit:
TAG : entity-framework
Date : January 02 2021, 05:34 AM , By : user3094157
How to Data Fetch using Entity Framework in dotnet core
How to Data Fetch using Entity Framework in dotnet core
like below fixes the issue You need to actually group your data before returning:I used LINQ Lambda notation, but it should be quite easy to translate back to query if you're so inclined:
TAG : entity-framework
Date : January 02 2021, 05:18 AM , By : user3093589
.AsNoTracking() always on for certains DbSets for entity framework
.AsNoTracking() always on for certains DbSets for entity framework
With these it helps That is a feature of EF Core. You can set the DbContext.ChangeTracker.QueryTrackingBehavior Property.
TAG : entity-framework
Date : January 01 2021, 06:46 AM , By : user3091399
Projecting hierarchies with AutoMapper+QueryableExtensions
Projecting hierarchies with AutoMapper+QueryableExtensions
wish help you to fix your issue Hierarchical queries are possible with ProjectTo but generally discouraged. Remember, ProjectTo only creates a LINQ Select expression. We can't create an infinite depth of projections, so you'll want to tell AutoMapper
TAG : entity-framework
Date : December 27 2020, 03:57 PM , By : user3084308
Entity Framework layer with crud methods called in webapi need reference to entities in data layer
Entity Framework layer with crud methods called in webapi need reference to entities in data layer
To fix this issue it depends how you are using the POCO classes.if the EF project uses POCO classes to return results and your API calls methods inside the EF project then you will need a reference to BOL because otherwise the API project doesn't kno
TAG : entity-framework
Date : December 25 2020, 07:30 PM , By : user3078245
How to fix: I am getting a "No coercion operator" error only after a .Join with .Include
How to fix: I am getting a "No coercion operator" error only after a .Join with .Include
may help you . Looks like a query generation bug/limitation in EF Core. There are still many query shapes that EF Core can't translate to SQL, but most of them should fail with an intelligible error message. This one just fails. Below is a repro and
TAG : entity-framework
Date : December 25 2020, 04:01 PM , By : the flying nerdyman
Entity Framework Core table filters (where a table has more than one use)
Entity Framework Core table filters (where a table has more than one use)
hop of those help? You can actually work around this "design" by creating an TPH inheritance hierarchy in EF Core. eg:
TAG : entity-framework
Date : December 25 2020, 08:01 AM , By : L0ki99
Convert SQL Command to lambda expression
Convert SQL Command to lambda expression
should help you out If possible, please guide me how to convert my SQL command to lambda expression , Two query
TAG : entity-framework
Date : December 24 2020, 12:45 PM , By : user3067305
Audit.NET Entity Framework to audit one same entry to two tables
Audit.NET Entity Framework to audit one same entry to two tables
wish help you to fix your issue This is not possible with the current version of the EntityFramework data provider, since you can only map from the known entity type and nothing else.But I've found a way to allow that kind of use cases with minimal i
TAG : entity-framework
Date : December 15 2020, 06:19 PM , By : Milind Gour
How to dispose Entity Framework Core in-memory database
How to dispose Entity Framework Core in-memory database
this one helps. Ok, the solution in my case was to call DbContextOptionsBuilder.UseApplicationServiceProvider()
TAG : entity-framework
Date : November 29 2020, 03:01 PM , By : Patrick
How to map table name to EF Entity?
How to map table name to EF Entity?
To fix the issue you can do I have been using EF Code First for 1 month. My project needs to work with many tables (over 100 tables of data) and they will be changed many times in the future. It hard to control and take time to add the migration. , U
TAG : entity-framework
Date : November 27 2020, 03:01 PM , By : Prince Mahen
How does Entity Framework Core handle instances before context is saved?
How does Entity Framework Core handle instances before context is saved?
like below fixes the issue I am curious how it handles it and if it gives up tracking the object when the instance is null
TAG : entity-framework
Date : November 24 2020, 12:01 PM , By : kevinmandich
Can't compile project after importing stored procedure
Can't compile project after importing stored procedure
I wish did fix the issue. The problem is that your model don't know anything about new parameters. I guess that it happens when your model using EntityFramework (EF) lower version (5.0 for example), but in code you are trying to use EF 6.0. So, you s
TAG : entity-framework
Date : November 22 2020, 12:01 PM , By : Ashish Mudgal
Do I need to make a class for every table in EF
Do I need to make a class for every table in EF
it should still fix some issue No, you don't have to have a class for mapping table. Just add navigation properties into Customer and Address classes and EF will take care of mapping table itself.If you're using DB first approach with context generat
TAG : entity-framework
Date : November 21 2020, 04:03 PM , By : janettwalker
My programs use Entity Framework. How can I add a field to a database table without having them throw exceptions?
My programs use Entity Framework. How can I add a field to a database table without having them throw exceptions?
around this issue I think the answer (or perhaps work-around) is as follows (my experience is only using SQL Server, and using the SSMS to edit the database tables):If you have a running system and you wish to add new fields to a database table, be s
TAG : entity-framework
Date : November 21 2020, 07:35 AM , By : xhghost
Caching a result from EF
Caching a result from EF
Hope that helps You need to call a method like ToList() to force linq to get the data. Then just add that list to your cache.
TAG : entity-framework
Date : November 18 2020, 12:01 PM , By : Caitlin
What is the point of the Update function in the Repository EF pattern?
What is the point of the Update function in the Repository EF pattern?
like below fixes the issue I wouldn't call this generic Update method generally "destructive" but I agree that it has limited use cases that are rarely discussed in those repository implementations. If the method is useful or not depends on the scena
TAG : entity-framework
Date : November 17 2020, 12:01 PM , By : bharath
Join four tables using Entity Framework
Join four tables using Entity Framework
wish help you to fix your issue I have 4 tables: , One solution could be:
TAG : entity-framework
Date : November 16 2020, 03:01 PM , By : Aref-GeEk
Prevent adding duplicated values
Prevent adding duplicated values
this will help Unfortunately, the way you're doing it will always result in a new director row for each reference to the same director object. Why? Because they are being added in three different contexts.EF only tracks objects through DbContext. It
TAG : entity-framework
Date : November 16 2020, 03:01 PM , By : ravi kishore
EF Core self referencing not working if there are 2 foreign keys to self (Code first)
EF Core self referencing not working if there are 2 foreign keys to self (Code first)
fixed the issue. Will look into that further If I defined (in code first) one navigation property to self it works (foreign key is created), but if I define 2 it doesn't work. , I prefer the fluent code for this stuff:
TAG : entity-framework
Date : November 12 2020, 03:00 PM , By : DavidB
How to union with a scalar value
How to union with a scalar value
Hope this helps In this pseudo-code, the last line won't work because the scalar value isn't IQueryable. , Writing
TAG : entity-framework
Date : November 09 2020, 03:01 PM , By : Yerzhan
how could I reduce tables with same property
how could I reduce tables with same property
should help you out I have 7 table and all of them have same property. , You can Seprate tables as below
TAG : entity-framework
Date : November 02 2020, 03:01 PM , By : user2171732
LINQ - Conditional Join
LINQ - Conditional Join
fixed the issue. Will look into that further You can use the below code, with no need to use join or where statements on _context.Mapper:
TAG : entity-framework
Date : October 09 2020, 08:00 AM , By : Ming Luo
GroupJoin: exception thrown: System.InvalidOperationException
GroupJoin: exception thrown: System.InvalidOperationException
will help you Since the exception is by the EF Core infrastructure, apparently you are hitting current EF Core implementation bug.But you can help EF Core query translator (thus avoiding their bugs caused by missing use cases) by following some rules
TAG : entity-framework
Date : October 08 2020, 07:00 PM , By : Master Expert
EF Core 2.2 LINQ query not working in EF Core 3.0
EF Core 2.2 LINQ query not working in EF Core 3.0
I wish did fix the issue. This is due to one of the breaking changes in EF Core 3.0 and that is: LINQ queries are no longer evaluated on the clientSo write the query in such way that EF Core can convert the expression into T-SQL or fetch the data int
TAG : entity-framework
Date : October 01 2020, 03:00 PM , By : moe
Making tests faster by using only partial database in EntityFramework Effort
Making tests faster by using only partial database in EntityFramework Effort
Hope this helps Disclaimer: I'm the owner of the project Entity Framework EffortOur library has a feature that allows creating a restore point and rollbacking to it.
TAG : entity-framework
Date : September 28 2020, 02:00 AM , By : Siva Prashanth
Create Database Views using EF Core Code First approach
Create Database Views using EF Core Code First approach
Does that help As far as I know, you can't create views with EF Core directly. However, you can use migrations to execute arbitrary SQL when upgrading. Generate a migration in the package manager console, even if there is nothing really to do: add-mi
TAG : entity-framework
Date : September 27 2020, 11:00 PM , By : user6076793
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