SqlFacetAttribute Class

Reference

Definition

Namespace:: Microsoft.SqlServer.Server

Assembly:: System.Data.SqlClient.dll

Assembly:: System.Data.dll

Assembly:: Microsoft.SqlServer.Server.dll

Package:: System.Data.SqlClient v4.8.5

Package:: Microsoft.SqlServer.Server v1.0.0

Important

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Annotates the returned result of a user-defined type (UDT) with additional information that can be used in Transact-SQL.

public ref class SqlFacetAttribute : Attribute

[System.AttributeUsage(System.AttributeTargets.Field | System.AttributeTargets.Parameter | System.AttributeTargets.Property | System.AttributeTargets.ReturnValue, AllowMultiple=false, Inherited=false)]
public class SqlFacetAttribute : Attribute

[<System.AttributeUsage(System.AttributeTargets.Field | System.AttributeTargets.Parameter | System.AttributeTargets.Property | System.AttributeTargets.ReturnValue, AllowMultiple=false, Inherited=false)>]
type SqlFacetAttribute = class
    inherit Attribute

Public Class SqlFacetAttribute
Inherits Attribute

Inheritance: Attribute
SqlFacetAttribute

Attributes: AttributeUsageAttribute

Remarks

SqlFacetAttribute may only be specified on non-void return values.

SqlFacetAttribute is used only to derive information about the return type, and is not intended to be a constraint specification on what can be stored in the type. Thus, if a field has a SqlFacetAttribute indicating its size to be 2 characters, then the SQL Server type of the field access expression is of size 2, but assignments into the field are not restricted by this facet.

The table below captures the matrix of valid values for the various properties for specific field types. In this table, "Y" indicates that the property is valid, and "N" indicates that the property is not valid.

The specified SqlFacetAttribute must be compatible with the field type. If the property is not valid, type registration will report an error if the user specifies a non-default value for the property. The maximum values for Precision and Scale properties are 38. For the MaxSize property, the value should be in the range of 1-8000 for binary and non-Unicode data, 1-4000 for Unicode data, or -1. All other values are not valid.

Type	IsFixedLength	MaxSize	Precision	Scale	IsNullable
SqlBoolean	N	N	N	N	Y
SqlByte	N	N	N	N	Y
SqlInt16	N	N	N	N	Y
SqlInt32	N	N	N	N	Y
SqlInt64	N	N	N	N	Y
SqlSingle	N	N	N	N	Y
SqlDouble	N	N	N	N	Y
SqlDateTime	N	N	N	N	Y
SqlMoney	N	N	N	N	Y
SqlGuid	N	N	N	N	Y
SqlDecimal	N	N	Y	Y	Y
SqlString	Y	Y	N	N	Y
SqlBinary	Y	Y	N	N	Y
SqlXml	N	N	N	N	Y
SqlBytes	Y	Y	N	N	Y
SqlChars	Y	Y	N	N	Y
Embedded UDTs	N	N	N	N	Y
String	Y	Y	N	N	Y
Byte[]	Y	Y	N	N	Y
Char[]	Y	Y	N	N	Y
DateTime	N	N	N	Y¹	N
Decimal	N	N	Y	Y	Y

(1) Specifying the scale on a DateTime type will cause the value to be returned to Transact-SQL as a DateTime2 type with the specified scale.

Constructors

SqlFacetAttribute()

An optional attribute on a user-defined type (UDT) return type, used to annotate the returned result with additional information that can be used in Transact-SQL.

Properties

IsFixedLength	Indicates whether the return type of the user-defined type is of a fixed length.
IsNullable	Indicates whether the return type of the user-defined type can be `null`.
MaxSize	The maximum size, in logical units, of the underlying field type of the user-defined type.
Precision	The precision of the return type of the user-defined type.
Scale	The scale of the return type of the user-defined type.

Applies to

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