Articolo
04/01/2012

Metodo EnumColumns (String, String, String)

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

Spazio dei nomi Microsoft.SqlServer.Management.Smo
Assembly: Microsoft.SqlServer.Smo (in Microsoft.SqlServer.Smo.dll)

Sintassi

'Dichiarazione
Public Function EnumColumns ( _
    tableName As String, _
    schemaName As String, _
    databaseName As String _
) As DataTable
'Utilizzo
Dim instance As LinkedServer
Dim tableName As String
Dim schemaName As String
Dim databaseName As String
Dim returnValue As DataTable

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

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

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

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

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

Parametri

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

schemaName
Tipo: System. . :: . .String
A String value that specifies the name of the schema.

databaseName
Tipo: System. . :: . .String
A String value that specifies the name of the database.

Valore restituito

Tipo: 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.