OBJECT_NAME (Transact-SQL)

Artikkeli
12/03/2008

Returns the database object name for schema-scoped objects. For a list of schema-scoped objects, see sys.objects (Transact-SQL).

Topic link icon Transact-SQL Syntax Conventions

Syntax

OBJECT_NAME ( object_id [, database_id ] )

Arguments

object_id
Is the ID of the object to be used. object_id is int and is assumed to be a schema-scoped object in the specified database, or in the current database context.

database_id
Is the ID of the database where the object is to be looked up. database_id is int.

Return Types

sysname

Exceptions

Returns NULL on error or if a caller does not have permission to view the object. If the target database has the AUTO_CLOSE option set to ON, the function will open the database.

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 OBJECT_NAME may return NULL if the user does not have any permission on the object. For more information, see Metadata Visibility Configuration and Troubleshooting Metadata Visibility.

Remarks

System functions can be used in the select list, in the WHERE clause, and anywhere an expression is allowed. For more information, see Expressions and WHERE.

The value returned by this system function uses the collation of the current database.

The SQL Server Database Engine assumes that object_id is in the context of the current database. A query that references an object_id in another database returns NULL or incorrect results. For example, in the following query the context of the current database is AdventureWorks. The Database Engine tries to return an object name for the specified object ID in that database instead of the database specified in the FROM clause of the query. Therefore, incorrect information is returned.

USE AdventureWorks;
GO
SELECT DISTINCT OBJECT_NAME(object_id)
FROM master.sys.objects;
GO

In Service Pack 2, you can resolve object names in the context of another database by specifying a database ID. The following example specifies the database ID for the master database in the OBJECT_SCHEMA_NAME function and returns the correct results.

USE AdventureWorks;
GO
SELECT DISTINCT OBJECT_SCHEMA_NAME(object_id, 1) AS schema_name
FROM master.sys.objects;
GO

Permissions

Requires ANY permission on the object. To specify a database ID, CONNECT permission to the database is also required, or the guest account must be enabled.

Examples

A. Using OBJECT_NAME in a WHERE clause

The following example returns columns from the sys.objects catalog view for the object specified by OBJECT_NAME in the WHERE clause of the SELECT statement.

USE AdventureWorks;
GO
DECLARE @MyID int;
SET @MyID = (SELECT OBJECT_ID('AdventureWorks.Production.Product',
    'U'));
SELECT name, object_id, type_desc
FROM sys.objects
WHERE name = OBJECT_NAME(@MyID);
GO

B. Returning the object schema name and object name

The following example returns the object schema name, object name, and SQL text for all cached query plans that are not ad hoc or prepared statements.

SELECT DB_NAME(st.dbid) AS database_name, 
    OBJECT_SCHEMA_NAME(st.objectid, st.dbid) AS schema_name,
    OBJECT_NAME(st.objectid, st.dbid) AS object_name, 
    st.text AS query_text
FROM sys.dm_exec_query_stats AS qs
CROSS APPLY sys.dm_exec_sql_text(qs.sql_handle) AS st
WHERE st.objectid IS NOT NULL;
GO

C. Returning three-part object names

The following example returns the database, schema, and object name along with all other columns in the sys.dm_db_index_operational_stats dynamic management view for all objects in all databases.

SELECT QUOTENAME(DB_NAME(database_id)) 
    + N'.' 
    + QUOTENAME(OBJECT_SCHEMA_NAME(object_id, database_id)) 
    + N'.' 
    + QUOTENAME(OBJECT_NAME(object_id, database_id))
    , * 
FROM sys.dm_db_index_operational_stats(null, null, null, null);
GO

Change History

Release	History
12 December 2006	New content: Added the database_id parameter to the Syntax and Arguments sections as new functionality in SP2. Added the Permissions section.
17 July 2006	New content: Added the Exceptions section.

Jaa