[英]Entity Framework Core 2 Owned Entity Types - Change Names of Table Columns
我有實體類,如下所示:
public class Bike
{
public int Id { get; set; }
public int ModelId { get; set; }
public Model Model { get; set; }
public Contact Contact { get; set; }
}
[Owned]
public class Contact
{
[Required]
[StringLength(255)]
public string Name { get; set; }
[StringLength(255)]
public string Email { get; set; }
[Required]
[StringLength(255)]
public string Phone { get; set; }
}
它會默認生成表:
migrationBuilder.CreateTable(
name: "Bike",
columns: table => new
{
Id = table.Column<int>(nullable: false)
.Annotation("SqlServer:ValueGenerationStrategy", SqlServerValueGenerationStrategy.IdentityColumn),
ModelId = table.Column<int>(nullable: false),
Contact_Name = table.Column<string>(maxLength: 255, nullable: false),
Contact_Email = table.Column<string>(maxLength: 255, nullable: true),
Contact_Phone = table.Column<string>(maxLength: 255, nullable: false)
},
constraints: table =>
{
table.PrimaryKey("PK_Bike", x => x.Id);
table.ForeignKey(
name: "FK_Bike_Models_ModelId",
column: x => x.ModelId,
principalTable: "Models",
principalColumn: "Id",
onDelete: ReferentialAction.Cascade);
});
如您所見,列名是: Contact_Name, Contact_Email, Contact_Phone
。
如何擺脫"_"
以獲取ContactName
...?
明確命名列:
modelBuilder.Entity<Order>().OwnsOne(
o => o.ShippingAddress,
sa =>
{
sa.Property(p => p.Street).HasColumnName("ShipsToStreet");
sa.Property(p => p.City).HasColumnName("ShipsToCity");
});
https://docs.microsoft.com/en-us/ef/core/modeling/owned-entities
另一個更復雜的例子(嵌套擁有的實體)看這個
empleador.OwnsOne(
property => property.RepresentanteLegal,
configuration =>
{
configuration.Property(repLegal => repLegal.Nombre).HasColumnName("Nombre").HasMaxLength(500);
configuration.OwnsOne(
property => property.Rut,
rutConfiguracion =>
{
rutConfiguracion.Property(rut => rut.DigitoVerificador).HasColumnName("RepLegalRutDv");
rutConfiguracion.Property(rut => rut.Numero).HasColumnName("RepLegalRutNumero");
});
});
您可以覆蓋DbContext
的OnModelCreating
方法,以避免顯式命名每個列名。
以下示例將刪除列名中的下划線:
public class MyDbContext : DbContext
{
protected override void OnModelCreating(ModelBuilder builder)
{
base.OnModelCreating(builder);
foreach(var entity in builder.Model.GetEntityTypes())
{
foreach(var property in entity.GetProperties())
{
property.Relational().ColumnName = property.Relational().ColumnName.Replace("_", String.Empty);
}
}
}
}
spidyx 答案在擁有類型的情況下不起作用,因為它們的定義位於導航中。
但是無論如何,在已經在模型構建器中設置了 OwnsOne 之后,我試圖找到一種更“反思方式”的方法,這里有一個片段:
private void SetupNamesConvention(ModelBuilder modelBuilder)
{
foreach (var entityType in modelBuilder.Model.GetEntityTypes())
{
foreach (var navigation in entityType.GetNavigations().Where(x => x.ClrType == typeof(YOUR_OWNS_ONE_PROPERTY)))
{
foreach (var fkProperty in navigation.ForeignKey.DeclaringEntityType.GetProperties())
{
// your code to set naming conventions
...
fkProperty.Relational().ColumnName;
...
}
}
}
}
如果通過以下方式進行操作可能會很有用:
.OwnsOne(e => e.Address, cb => { cb.Property(e => e.Postcode).HasColumnName("Postcode"); });
不是最佳的,就像您有一些自定義邏輯可以遍歷每個屬性並設置命名約定。
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