EnumColumns méthode
Enumerates a list of columns that can be accessed on the linked server.
Espace de noms : Microsoft.SqlServer.Management.Smo
Assembly : Microsoft.SqlServer.Smo (dans Microsoft.SqlServer.Smo.dll)
Syntaxe
'Déclaration
Public Function EnumColumns As DataTable
'Utilisation
Dim instance As LinkedServer
Dim returnValue As DataTable
returnValue = instance.EnumColumns()
public DataTable EnumColumns()
public:
DataTable^ EnumColumns()
member EnumColumns : unit -> DataTable
public function EnumColumns() : DataTable
Valeur de retour
Type : 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 |
The number of significant digits in the column. The return value for the PRECISION column is in base 10. |
|
BUFFER_LENGTH |
The transfer size of the data to and from the column. |
|
DECIMAL_DIGITS |
The number of digits to the right of the decimal point. |
|
NUM_PREC_RADIX |
The base for numeric data types. |
|
NULLABLE |
The nullability of the column. 1 = NULL is possible. 0 = NOT NULL. |
|
REMARKS |
This field always returns NULL. |
|
COLUMN_DEF |
The default value of the column. |
|
SQL_DATA_TYPE |
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 |
The subtype code for DateTime and ISO interval data types. For other data types, this column returns NULL. |
|
CHAR_OCTET_LENGTH |
The maximum length in bytes of a character or integer data type column. For all other data types, this column returns NULL. |
|
ORDINAL_POSITION |
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 |
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 |
The ordinal position of the column in the table. The first column in the table is 1. This column always returns a value. |