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09/24/2010

EnumColumns 方法 (String)

Enumerates a list of columns that can be accessed on the linked server for a specified table.

命名空間： Microsoft.SqlServer.Management.Smo
組件： Microsoft.SqlServer.Smo (在 Microsoft.SqlServer.Smo.dll 中)

語法

'宣告
Public Function EnumColumns ( _
    tableName As String _
) As DataTable
'用途
Dim instance As LinkedServer
Dim tableName As String
Dim returnValue As DataTable

returnValue = instance.EnumColumns(tableName)

public DataTable EnumColumns(
    string tableName
)

public:
DataTable^ EnumColumns(
    String^ tableName
)

member EnumColumns : 
        tableName:string -> DataTable

public function EnumColumns(
    tableName : String
) : DataTable

參數

tableName
型別：System. . :: . .String
A String value that specifies the name of the table.

傳回值

型別：System.Data. . :: . .DataTable
A DataTable object value that contains a list of tables that can be accessed on the linked server. The table describes the different columns of the returned DataTable.

Column	Data type	Description
COLUMN_SIZE	Int32	The number of significant digits in the column. The return value for the PRECISION column is in base 10.
BUFFER_LENGTH	Int32	The transfer size of the data to and from the column.
DECIMAL_DIGITS	Int32	The number of digits to the right of the decimal point.
NUM_PREC_RADIX	Int32	The base for numeric data types.
NULLABLE	Int32	The nullability of the column. 1 = NULL is possible. 0 = NOT NULL.
REMARKS	String	This field always returns NULL.
COLUMN_DEF	String	The default value of the column.
SQL_DATA_TYPE	Int32	The value of the SQL data type as it appears in the TYPE field of the descriptor. This column is the same as the DATA_TYPE column, except for the DateTime and ISO interval data types. This column always returns a value.
SQL_DATETIME_SUB	Int32	The subtype code for DateTime and ISO interval data types. For other data types, this column returns NULL.
CHAR_OCTET_LENGTH	Int32	The maximum length in bytes of a character or integer data type column. For all other data types, this column returns NULL.
ORDINAL_POSITION	Int32	The ordinal position of the column in the table. The first column in the table is 1. This column always returns a value.
IS_NULLABLE	String	The nullability of the column in the table. ISO rules are followed to determine nullability. An ISO SQL-compliant DBMS cannot return an empty string. YES = Column can include NULLS. NO = Column cannot include NULLS. This column returns a zero-length string if nullability is unknown. The value returned for this column is different from the value returned for the NULLABLE column.
SS_DATA_TYPE	Int32	The ordinal position of the column in the table. The first column in the table is 1. This column always returns a value.