• Article

Méthode EnumColumns (String, String, String, String)

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

Espace de noms :  Microsoft.SqlServer.Management.Smo
Assembly :  Microsoft.SqlServer.Smo (en Microsoft.SqlServer.Smo.dll)

Syntaxe

'Déclaration
Public Function EnumColumns ( _
    tableName As String, _
    schemaName As String, _
    databaseName As String, _
    columnName As String _
) As DataTable
'Utilisation
Dim instance As LinkedServer
Dim tableName As String
Dim schemaName As String
Dim databaseName As String
Dim columnName As String
Dim returnValue As DataTable

returnValue = instance.EnumColumns(tableName, _
    schemaName, databaseName, columnName)

public DataTable EnumColumns(
    string tableName,
    string schemaName,
    string databaseName,
    string columnName
)

public:
DataTable^ EnumColumns(
    String^ tableName, 
    String^ schemaName, 
    String^ databaseName, 
    String^ columnName
)

member EnumColumns : 
        tableName:string * 
        schemaName:string * 
        databaseName:string * 
        columnName:string -> DataTable 

public function EnumColumns(
    tableName : String, 
    schemaName : String, 
    databaseName : String, 
    columnName : String
) : DataTable

Paramètres

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

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_DATETIMEE_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.