Data extraction and ad hoc query of an entity-attribute-value database. J Am Med Inform Assoc 1998;5:511-27.Nadkarni, P. and C. Brandt. 1998. Data extraction and ad hoc query of an entity-attribute-value databas
The logical name of the entity that contains the attribute. ExternalName Edm.String The external name of an object, typically based on it's name in it's original source. HasChanged Edm.Boolean Indicates whether the item of metadata has changed. Inherited from: MetadataBase InheritsFrom Edm....
Sign in .NET Languages Features Workloads APIs Troubleshooting Resources Download .NET Version Entity Framework 4.3.1 System.ComponentModel.DataAnnotations System.ComponentModel.DataAnnotations ColumnAttribute ComplexTypeAttribute DatabaseGeneratedAttribute DatabaseGeneratedAttribute ...
Value derived from a database query? Persisted in the database? persistent yes yes (the value outlives the class that created it) transient no no Persistent entity attributes correspond to database columns When you first create an entity object usingreverse generation, a persistent entity attribute...
DatabaseGeneratedAttribute.DatabaseGeneratedOption 屬性 參考 意見反應 定義 命名空間: System.ComponentModel.DataAnnotations 組件: EntityFramework.dll 用來針對資料庫中的屬性產生值的模式。 C# 複製 public System.ComponentModel.DataAnnotations.DatabaseGeneratedOption DatabaseGeneratedOption { g...
The None option prevents values from being generated by the database automatically in cases where they would otherwise be created. Convention specifies that a property named 'Id' with a data type of int will be configured as the primary key for an entity, and will be mapped to an Identity ...
Assembly: Microsoft.EntityFrameworkCore.dll Package: Microsoft.EntityFrameworkCore v8.0.0 Creates a new instance of DatabaseGeneratedAttributeConvention. C# Copy public DatabaseGeneratedAttributeConvention (Microsoft.EntityFrameworkCore.Metadata.Conventions.Infrastructure.ProviderConventionSe...
If the MVC data model or entity partial class contains a field that is annotated with the RequiredAttribute attribute, but the page does not contain the property, an error is not raised. Validation occurs only for fields that are submitted to the server.Constructor...
Modified(Last Written): This date-time stamp represents the last time the $DATA attribute of a file was altered. For example, if a user opened a .BAT file, edited the content, and resaved the file, the file's Last Written time will most likely be updated as well. In contrast, if ...
(Inherited from DataAttribute) ThisKey Gets or sets members of this entity class to represent the key values on this side of the association. TypeId When implemented in a derived class, gets a unique identifier for this Attribute. (Inherited from Attribute) Methods Expand table Equals(...