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sp_describe_cursor_columns

SQL Server 2000

Reports the attributes of the columns in the result set of a server cursor.

Syntax

sp_describe_cursor_columns
    
[ @cursor_return = ] output_cursor_variable OUTPUT
    { [ , [ @cursor_source = ] N'local'
        ,
[ @cursor_identity = ] N'local_cursor_name' ]
            | [ , [ @cursor_source = ] N'global'
        ,
[ @cursor_identity = ] N'global_cursor_name' ]
            | [ , [ @cursor_source = ] N'variable'
        ,
[ @cursor_identity = ] N'input_cursor_variable' ]
    }

Arguments

[@cursor_return =] output_cursor_variable OUTPUT

Is the name of a declared cursor variable to receive the cursor output. output_cursor_variable is cursor, with no default, and must not be associated with any cursors at the time sp_describe_cursor_columns is called. The cursor returned is a scrollable, dynamic, read-only cursor.

[@cursor_source =] { N'local' | N'global' | N'variable' }

Specifies whether the cursor being reported on is specified using the name of a local cursor, a global cursor, or a cursor variable. The parameter is nvarchar(30).

[@cursor_identity =] N'local_cursor_name'

Is the name of a cursor created by a DECLARE CURSOR statement either having the LOCAL keyword, or that defaulted to LOCAL. local_cursor_name is nvarchar(128).

[@cursor_identity =] N'global_cursor_name'

Is the name of a cursor created by a DECLARE CURSOR statement either having the GLOBAL keyword, or that defaulted to GLOBAL. It can also be the name of an API server cursor opened by an ODBC application that then named the cursor by calling SQLSetCursorName. global_cursor_name is nvarchar(128).

[@cursor_identity =] N'input_cursor_variable'

Is the name of a cursor variable associated with an open cursor. input_cursor_variable is nvarchar(128).

Return Code Values

None

Cursors Returned

sp_describe_cursor_columns encapsulates its report as a Transact-SQL cursor output parameter. This allows Transact-SQL batches, stored procedures, and triggers to work with the output one row at a time. It also means that the procedure cannot be called directly from database API functions. The cursor output parameter must be bound to a program variable, but the database APIs do not support binding cursor parameters or variables.

This is the format of the cursor returned by sp_describe_cursor_columns.

Column name Data type Description
column_name sysname

nullable

Name assigned to the result set column. The column is NULL if the column was specified without an accompanying AS clause.
ordinal_position int Relative position of the column from the leftmost column in the result set. The first column is in position 0.
column_characteristics_flags int A bitmask indicating the information stored in DBCOLUMNFLAGS in OLE DB. Can be one or a combination of the following:

1 = Bookmark
2 = Fixed length
4 = Nullable
8 = Row versioning
16 = Updatable column (set for projected columns of a cursor that has no FOR UPDATE clause and, if there is such a column, can be only one per cursor).

When bit values are combined, the characteristics of the combined bit values apply. For example, if the bit value is 6, the column is a fixed-length (2), nullable (4) column.

column_size int Maximum possible size for a value in this column.
data_type_sql smallint Number indicating the SQL Server data type of the column.
column_precision tinyint Maximum precision of the column as per the bPrecision value in OLE DB.
column_scale tinyint Number of digits to the right of the decimal point for the numeric or decimal data types as per the bScale value in OLE DB.
order_position int If the column participates in the ordering of the result set, the position of the column in the order key relative to the leftmost column.
order_direction varchar(1), nullable A = The column is in the order key and the ordering is ascending.
D = The column is in the order key and the ordering is descending.
NULL = The column does not participate in ordering.
hidden_column smallint If a value of 0, this column appears in the select list. The value 1 is reserved for future use.
columnid int Column ID of the base column. If the result set column was built from an expression, columnid is -1.
objectid int Object ID of the base table supplying the column. If the result set column was built from an expression, objectid is -1.
dbid int ID of the database containing the base table supplying the column. If the result set column was built from an expression, dbid is -1.
dbname sysname

nullable

Name of the database containing the base table supplying the column. If the result set column was built from an expression, dbname is NULL.

Remarks

sp_describe_cursor_columns describes the attributes of the columns in the result set of a server cursor, such as the name and data type of each cursor. Use sp_describe_cursor for a description of the global attributes of the server cursor. Use sp_describe_cursor_tables for a report of the base tables referenced by the cursor. Use sp_cursor_list to get a report of the Transact-SQL server cursors visible on the connection.

Permissions

Execute permissions default to the public role.

Examples

This example opens a global cursor and uses sp_describe_cursor_columns to report on the columns used in the cursor.

USE Northwind
GO
-- Declare and open a global cursor.
DECLARE abc CURSOR KEYSET FOR
SELECT LastName
FROM Employees
GO
OPEN abc

-- Declare a cursor variable to hold the cursor output variable
-- from sp_describe_cursor_columns.
DECLARE @Report CURSOR

-- Execute sp_describe_cursor_columns into the cursor variable.
EXEC master.dbo.sp_describe_cursor_columns
      @cursor_return = @Report OUTPUT,
      @cursor_source = N'global', @cursor_identity = N'abc'

-- Fetch all the rows from the sp_describe_cursor_columns output cursor.
FETCH NEXT from @Report
WHILE (@@FETCH_STATUS <> -1)
BEGIN
   FETCH NEXT from @Report
END

-- Close and deallocate the cursor from sp_describe_cursor_columns.
CLOSE @Report
DEALLOCATE @Report
GO
-- Close and deallocate the original cursor.
CLOSE abc
DEALLOCATE abc
GO

See Also

Cursors

CURSOR_STATUS

DECLARE CURSOR

sp_describe_cursor

sp_cursor_list

sp_describe_cursor_tables

System Stored Procedures

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