PrimaryKeyAttribute(String, String[]) 初始化 PrimaryKeyAttribute 类的新实例。属性展开表 PropertyNames 按顺序构成主键的属性。适用于产品版本 Entity Framework Core 7.0, 8.0, 9.0 在GitHub 上与我们协作 可以在 GitHub 上找到此内容的源,还可以在其中创建和查看问题和拉取请求。 有关详细信息,请参阅参与...
.PrimaryKey(t => t.Id); CreateTable( "dbo.WarrantyCard", c =>new { ProductId = c.Int(nullable:false), ExpiredDate = c.DateTime(nullable:false), }) .PrimaryKey(t => t.ProductId) .ForeignKey("dbo.Product", t => t.ProductId) .Index(t => t.ProductId); 变化就在于外键添加到Wa...
Primary Key Attribute subject Operations Supported POSTGETPATCHDELETE Properties Properties represent fields of data stored in the entity.Some properties are read-only. 展开表 NameTypeDetails annotationidEdm.Guid Unique identifier of the note.
Namespace: Microsoft.Dynamics.CRM Entity set path: [organization URI]/api/data/v9.2/attributes Base type: crmbaseentity Table type: Standard Display name: Attribute Primary key: attributeid Primary name column: name Operations supported: GET (RetrieveMultiple Only) ...
在使用Required特性(Attribute)设置字段不允许为空时,需要添加命名空间引用: 1 usingSystem.ComponentModel.DataAnnotations; 2>、Fluent API方式 1 2 3 4 5 6 7 8 9 protectedoverridevoidOnModelCreating(DbModelBuilder modelBuilder) { modelBuilder.Entity<Product>().Property(t => t.ProductID) ...
In the latter case, the names of primary key fields or properties in the composite primary key class and those of the entity class must correspond and their types must be the same. Using Annotations Example 7-2 shows a typical embeddable composite primary key class. Example 7-3 shows how ...
Is the attribute secondary key. Display name: IsSecondaryKey Read only Default options Expand table ValuesLabel 1 True 0 False logicalname Edm.String The logical name of this Entity Key. Display name: Logical Name name Edm.String The name of this Entity Key. Display name: Name ove...
At runtime, when you access the related Key object for any entity row using the getKey() method, this Key object contains the value of the primary key attribute for the entity object. If your entity object has multiple primary key attributes, the Key object contains each of their values....
对数据库表中的主键进行映射,使用 Key() Attribute。当主键是自增键时,还需要设置 DatabaseGenerated() Attribute。 代码语言:javascript 复制 [Table("hospital")] public class Hospital { [Key] [DatabaseGenerated(DatabaseGeneratedOption.Identity)] [Column("id")] public int Id { get; set; } } 使用...
SuppressMessageAttribute Applies to Entity Framework 6.2.0 and other versions ProductVersions Entity Framework4.3.1, 5.0.0, 6.2.0 HasKey<TKey>(Expression<Func<TEntityType,TKey>>, Action<PrimaryKeyIndexConfiguration>) Configures the primary key property(s) for this entity type. ...