Is it possible to add CHECK constraint with fluent API in EF7?

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entity framework core foreign key name
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Is it possible to add CHECK constraint with fluent API in Entity Framework 7?

I need to acheive something like this:

...
ADD CONSTRAINT CK_SomeTable_SomeColumn CHECK (SomeColumn >= X);

It is ok if solution is provider-specific - I am targeting MsSqlServer only (at least now).

As of EF 7.0.0-rc1, it isn't possible with the fluent API.

You can define the constraint manually in the migration

migrationBuilder.Sql("ALTER TABLE SomeTable ADD CONSTRAINT CK_SomeTable_SomeColumn CHECK (SomeColumn >= X);");

Is it possible to add CHECK constraint with fluent API in EF7?, As of EF 7.0.0-rc1, it isn't possible with the fluent API. You can define the constraint manually in the migration migrationBuilder.Sql("ALTER� One is using simple attributes called DataAnnotations and the other is using code first’s Fluent API, which provides you with a way to describe configurations imperatively, in code. For more information please visit the link mentioned below.

As of EF Core 3.0, you can use

protected override void OnModelCreating(ModelBuilder modelBuilder)
{
    modelBuilder.Entity<SomeTable>(entity =>
        entity.HasCheckConstraint("CK_SomeTable_SomeColumn", "[SomeColumn] >= X");
}

[SOLVED] - EF Core Check constraint, Is it possible to add a check constraint to a table via EF core. I have been looking around the only question I found is for Ef 7 with an anwesr over� Is it possible to add a check constraint to a table via EF core. I have been looking around the only question I found is for Ef 7 with an anwesr over a year ago. So I am just wandering if anything has changed.

Lukas Kabrt is still valid in 2019 so I had to create a special migration that I will include constraint and its drop:

        protected override void Up(MigrationBuilder migrationBuilder)
        {
            migrationBuilder.Sql(@"
alter table AdminObjectReview add CONSTRAINT CK_AdminObjectReview_OnlyOneType CHECK 
( 
      (CASE WHEN AnswerId IS NULL THEN 0 ELSE 1 END)
    + (CASE WHEN QuestionId IS NULL THEN 0 ELSE 1 END)
    + (CASE WHEN CommentId IS NULL THEN 0 ELSE 1 END)
    + (CASE WHEN UserId IS NULL THEN 0 ELSE 1 END)
    + (CASE WHEN TagId IS NULL THEN 0 ELSE 1 END)
     = 1 )
");
        }

        protected override void Down(MigrationBuilder migrationBuilder)
        {
            migrationBuilder.Sql("alter table AdminObjectReview  drop CONSTRAINT CK_AdminObjectReview_OnlyOneType");
        }

How to create CHECK constraint Use Fluent API? � Issue #831 , I want to create a check constraint,eg gender CREATE TABLE `test1` ( `id` int(11) NOT NULL AUTO_INCREMENT , `gender` varchar(6)� entity framework core - ContextModelSnapshot and Manual Migrations in EF7; entity framework core - Is it possible to add CHECK constraint with fluent API in EF7? entity framework core - EF7 - How to check if database exists? How to run stored procedures in Entity Framework Core? entity framework - I have several EF Migrations.

Generated Values, Value generated on add. Value generated on add means that a value is generated for new entities. Data Annotations; Fluent API. C# Copy. The Entity Framework Core Fluent API HasConstraintName method enables you to specify the name of the foreign key constraint for a relationship.. By default. EF Core will name a foreign key constraint according to the following pattern:

Configuring One To Many Relationships in Entity Framework Core , How to use the Fluent API to configure one to many relationships in Entity In addition, the referential action constraint on the relationship will be set to NoAction� Fluent API in Entity Framework Core. Entity Framework Fluent API is used to configure domain classes to override conventions. EF Fluent API is based on a Fluent API design pattern (a.k.a Fluent Interface) where the result is formulated by method chaining. In Entity Framework Core, the ModelBuilder class acts as a Fluent API. By using it, we can

The Fluent API HasConstraintName Method, The Entity Framework Core Fluent API HasConstraintName method enables you to specify the name of the foreign key constraint for a relationship. By default. Creating indexes isn't natively supported by the Fluent API, but you can make use of the support for IndexAttribute via the Fluent API. Index attributes are processed by including a model annotation on the model that is then turned into an Index in the database later in the pipeline. You can manually add these same annotations using the Fluent API.

Comments
  • It is not check constraint, but I have used the following to enforce only blessed values: public sealed class ProfileStatus { public string Name { get; } public static readonly ProfileStatus Public = new ProfileStatus("Public"); public static readonly ProfileStatus Private = new ProfileStatus("Private"); public static readonly ProfileStatus VerifiedOnly = new ProfileStatus("VerifiedOnly"); private ProfileStatus(string name) { Name = name; } } And I can not get it the format correctly, sorry...
  • Just in case anyone is wondering you need to install the Microsoft.EntityFrameworkCore.Relational NuGet package to use this extension method.
  • I don't see how this adds anything beyond what that the accepted answer already explains. Can you make that clearer?
  • It does. Extends the accepted answer with a suggestion, that the constraint can / should be dropped in the migrations Down method. +1 because the -1 was unfair