TYPE_ID (Transact-SQL)

Článek
05/16/2013

Returns the ID for a specified data type name.

Topic link icon Transact-SQL Syntax Conventions

Syntax

TYPE_ID ( [ schema_name ] type_name )

Arguments

type_name
Is the name of the data type. type_name is of type nvarchar. type_name can be a system or user-defined data type.

Return Types

int

Exceptions

Returns NULL on error or if a caller does not have permission to view the object.

In SQL Server, a user can only view the metadata of securables that the user owns or on which the user has been granted permission. This means that metadata-emitting, built-in functions such as TYPE_ID may return NULL if the user does not have any permission on the object. For more information, see Metadata Visibility Configuration.

Remarks

TYPE_ID returns NULL if the type name is not valid, or if the caller does not have sufficient permission to reference the type.

Examples

A. Looking up the TYPE ID values for single- and two-part type names

The following example returns type ID for single- and two-part type names.

USE tempdb;
GO
CREATE TYPE NewType FROM int;
GO
CREATE SCHEMA NewSchema;
GO
CREATE TYPE NewSchema.NewType FROM int;
GO
SELECT TYPE_ID('NewType') AS [1 Part Data Type ID],
       TYPE_ID('NewSchema.NewType') AS [2 Part Data Type ID];
GO

B. Looking up the TYPE ID of a system data type

The following example returns the TYPE ID for the datetime system data type.

SELECT TYPE_NAME(TYPE_ID('datetime')) AS [TYPE_NAME]
    ,TYPE_ID('datetime') AS [TYPE_ID];
GO

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