SQL column default value with Entity Framework

Question

I am trying to use Code-First EF6 with default SQL values.

For example, I have a \"CreatedDate\" column/property not null with a default in SQL of \"getdate()\"

Answer 1

Accepted answer is correct for EF6, I'm only adding EF Core solution; (also my solution focuses on changing the default-value, rather than creating it properly the first time)

There is still no Data-Attribute in EF Core.

And you must still use the Fluent API; it does have a HasDefaultValue

protected override void OnModelCreating(ModelBuilder modelBuilder)
{
    modelBuilder.Entity()
        .Property(b => b.Rating)
        .HasDefaultValue(3);
}

Note, there is also HasDefaultValueSql for NULL case:

        .HasDefaultValueSql("NULL");

And you can also use the Migrations Up and Down methods, you can alter the defaultValue or defaultValueSql but you may need to drop Indexes first. Here's an example:

public partial class RemovingDefaultToZeroPlantIdManualChange : Migration
{
    protected override void Up(MigrationBuilder migrationBuilder)
    {
        migrationBuilder.DropIndex(
            name: "IX_TABLE_NAME_COLUMN_NAME",
            table: "TABLE_NAME"
        );

        migrationBuilder.AlterColumn(
            name: "COLUMN_NAME",
            table: "TABLE_NAME",
            nullable: true,
            //note here, in the Up method, I'm specifying a new defaultValue:
            defaultValueSql: "NULL",
            oldClrType: typeof(int));

        migrationBuilder.CreateIndex(
            name: "IX_TABLE_NAME_COLUMN_NAME",
            table: "TABLE_NAME",
            column: "COLUMN_NAME"
        );
    }

    protected override void Down(MigrationBuilder migrationBuilder)
    {
        migrationBuilder.DropIndex(
            name: "IX_TABLE_NAME_COLUMN_NAME",
            table: "TABLE_NAME"
        );

        migrationBuilder.AlterColumn(
            name: "COLUMN_NAME",
            table: "TABLE_NAME",
            nullable: true,
            //note here, in the Down method, I'll restore to the old defaultValue:
            defaultValueSql: "0",
            oldClrType: typeof(int));

        migrationBuilder.CreateIndex(
            name: "IX_TABLE_NAME_COLUMN_NAME",
            table: "TABLE_NAME",
            column: "COLUMN_NAME"
        );


    }
}