Ef core filter data

Some databases also support expression indexes, which can be directly used to speed up queries filtering by any expression. Different databases allow indexes to be configured in various ways, and in many cases EF Core providers expose these via the Fluent API. In this post I will discuss about how to use GraphQL on top EF Core. First I will be adding nuget packages required to work with EF Core - Microsoft.EntityFrameworkCore.SqlServer and Microsoft.EntityFrameworkCore.Design - this optional, since I am running migrations this package is required. Next I am modifying the code - adding DbContext and. Filtering for certain sub-types in EF-Core and TPT-inheritance in WebApi. I am using the EF-Core and have a data model like that (just an example with the animal to keep things simple). The inhertitance is mapped in the database via TPT (table per type). public abstract class Animal { } public class Monkey : Animal { } public class Bear. Data property inheritance in EF Core 3.0 How, in EF core, to check if a navigation property is set the most efficient way Navigation property is always null when using Include with EF Core. Description. The EF BulkInsert extension method let you insert a large number of entities in your database. // Easy to use context.BulkInsert (customers); // Easy to customize context.BulkInsert (invoices, options => options.IncludeGraph = true ); Try it in EF6 | Try it in EF Core. In this article, we will cover filtering in ASP.NET Core Web API. We’ll learn what filtering is, how it’s different from searching, and how to implement it in a real-world project. While not critical as paging, filtering is still an important part of a flexible REST API, so we need to know how to implement it in our API projects. Filtering. EF Core (7.0) is the evolution of Microsoft’s data-access tool and has been rebuilt from the ground up to be with a focus on performance and portability. We’ll be using EF Core in this post to isolate tenant data using the database-per-tenant approach. Getting Started. I’ll be building on the sample MVC application from the other posts. It uses ASP.NET Identity and is. Now, probably it could be treated as EF Core bug. But I strongly recommend not using unmapped properties in LINQ queries in general, and especially in query filter conditions. Even if they work, the client evaluation will cause loading a lot of data in memory just to apply the filter there, rather than at the database (SQL) side. ApplyFiltering () works well for filtering on foreign keys but when filtering on a navigation property collection using .Where () it throws on ICollection Grades on Member when just before the filtering it was included. This is the method inside ApplyFiltering () that throws: private static IQueryable<Member> SearchByCurrentGradeRange. The problem seems to occur when trying to compare dates when there is a posibility of there being no date to compare to (ie. table being empty, other criteria not resulting in a match etc.) I have tried both "t.LastUpdated < DateTime.Now.AddDays (-7)" and "t.LastUpdated.AddDays (7) < DateTime.Now" I have also tried making the field "LastUpdated. Solution 1. First, you need a controller that takes the dates as parameters, they are posted on your form. Then you need to query your data to get values between the dates. The code you posted seems reasonable. If you want help, you need to say more than 'does not work'. Tell us what you tried. Mark filtered data: You need to add a property to each class mapped to the database (referred to as entity classes in this article) that holds the DataKey. Add EF Core’s query filter: In the application’s DbContext you set up a global query filter for each entity class that is private to the tenant. Mark new data with user’s DataKey: When new entity classes are added. I found different implementations for query specification. Some of these where small and simple while others where real monsters. I started going with implementation given in Implement the infrastructure persistence layer with Entity Framework Core chapter of Entity Framework Core documentation. I modified BaseSpeficiation<T> a little bit to. Also, it is only for EF Core. ABP Framework provides a data seed system that is; Modular: Any module can silently contribute to the data seeding process without knowing and effecting each other. In this way, a module seeds its own initial data. Database Independent: It is not only for EF Core, it also works for other database providers (like. To enable filtering on a column bound to an object, bind the column to a field of that object. Filter Modes. The Grid supports the following filter modes: Filter row (demo) Filter checkboxes (demo) Filter menu (demo) To set the desired filter mode, use the Filterable->Mode property.

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