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EnumColumns Method

后续版本的 Microsoft SQL Server 将删除该功能。 请避免在新的开发工作中使用该功能，并着手修改当前还在使用该功能的应用程序。

The EnumColumns method returns a QueryResults object that enumerates the columns of tables defined on a linked server.

语法

object.EnumColumns( [ TableName ] , [ SchemaName ] , [ CatalogName ]
, [ ColumnName ] )as QueryResults

Parts

  • object
    Expression that evaluates to an object in the Applies To list.

  • TableName
    Optional. String that names a table defined on the linked server. When specified, it restricts result set membership to the columns defined in the specified table.

  • SchemaName
    Optional. String that names a schema on which the linked server table is defined. When specified, it restricts result set membership to the columns of tables defined on the schema.

  • CatalogName
    Optional. String that names a catalog on which the linked server table is defined. When specified, it restricts result set membership to the columns of tables defined on the catalog.

  • ColumnName
    Optional. String that names a column on a table named by the TableName argument. When specified, it restricts result set membership, returning a single row that enumerates the column named.

Prototype (C/C++)

HRESULT EnumColumns(LPSQLDMOQUERYRESULTS *ppResults,
SQLDMO_LPCSTR TableName = NULL,
SQLDMO_LPCSTR SchemaName = NULL,
SQLDMO_LPCSTR CatalogName = NULL,
SQLDMO_LPCSTR ColumnName = NULL);

Returns

A QueryResults object that contains one result set defined by these columns.

Column

Data type

Description

BUFFER_LENGTH

integer

When the data type is a fixed or variable-length character or binary type, the number of bytes required to retrieve any value from the column.

CHAR_OCTET_/LENGTH

integer

Maximum length, in bytes, of a character data type.

COLUMN_DEF

nvarchar(128)

Default value.

COLUMN_NAME

nvarchar(128)

Name of the column.

COLUMN_SIZE

integer

When the data type is a fixed or variable-length character or binary type, the number of characters or bytes. When the data type is a fixed-precision numeric type, the precision of the data type.

DATA_TYPE

smallint

Data type of the column. Interpret the value using SQLDMO_QUERY_DATATYPE.

DECIMAL_DIGITS

smallint

When the data type is a fixed-precision numeric type, the scale of the data type.

IS_NULLABLE

char(10)

YES when the column may contain NULL. NO when the column cannot contain NULL.

NULLABLE

smallint

1 when the column accepts NULL. 0 when the column does not accept NULL.

NUM_PREC_RADIX

smallint

Radix of a numeric data type.

ORDINAL_/POSITION

smallint

Ordinal position of the column in the table.

REMARKS

nvarchar(256)

Descriptive text.

SQL_DATA_TYPE

smallint

Data type of the column. Interpret the value using SQLDMO_QUERY_DATATYPE.

SQL_DATETIME_/SUB

smallint

Subtype code for ISO date, time, and interval data types.

SS_DATA_TYPE

tinyint

Microsoft SQL Server data type interpreted using data type constants defined by Open Data Services.

TABLE_CAT

nvarchar(128)

Name of the SQL Server database in which the column is defined.

TABLE_NAME

nvarchar(128)

Name of the table in which the column is defined.

TABLE_SCHEM

nvarchar(128)

Name of the owner of the table in which the column is defined.

TYPE_NAME

nvarchar(128)

Name of the column data type.

Applies To:

LinkedServer Object