Dapper Contrib Key Use Data Annotation to Specify Key Column
Description
The Data Annotation Key
Attribute is used to specify the primary key of a table. It is applied to a property of a class that maps to a primary key column in a database table. It specifies the property as a key that is automatically generated by the database (Identity Column).
- The
Key
attribute can be applied to a property in an entity class to make it a key property and the corresponding column in the database table will be configured as a primary key. - When the
Key
attribute is applied to a property, the property becomes a part of the entity's key and cannot be changed or assigned a new value. - An error will be generated if we try to update the key property.
In the following example, the InvoiceID
is decorated with a Key
attribute to specify the primary key of a table.
[Table("Invoice")] public class InvoiceContrib { [Key] public int InvoiceID { get; set; } public string Code { get; set; } public InvoiceKind Kind { get; set; } [Write(false)] [Computed] public string FakeProperty { get; set; } } using (var connection = My.ConnectionFactory()) { connection.Open(); var identity = connection.Insert(new InvoiceContrib {Kind = InvoiceKind.WebInvoice, Code = "Insert_Single_1"}); }
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