ColumnMaxLength Property
Questa caratteristica verrà rimossa a partire da una delle prossime versioni di Microsoft SQL Server. Evitare di utilizzare questa funzionalità in un nuovo progetto di sviluppo e prevedere interventi di modifica nelle applicazioni in cui è attualmente implementata.
The ColumnMaxLength property exposes the maximum number of characters required to store the data of a column in the current result set of a QueryResults object.
Sintassi
object.ColumnMaxLength(OrdinalColumn)
Parts
object
An expression that evaluates to an object in the Applies To list.OrdinalColumn
A long integer that specifies the column in the results by position.
Data Type
String
Modifiable
Read-only
Prototype (C/C++)
HRESULT GetColumnMaxLength(long nColumn, LPLONG pRetVal);
Osservazioni
Interpret the value of the ColumnMaxLength property with respect to the data type of the column in the result set. Retrieve the data type using the ColumnType property.
ColumnType property |
ColumnMaxLength |
|---|---|
SQLDMO_DTypeBinary, SQLDMO_DTypeGUID, SQLDMO_DTypeImage, SQLDMO_DTypeNText, SQLDMO_DTypeText, or SQLDMO_DTypeVarBinary |
A system-defined value. Use the GetColumnBinaryLength method to determine the length of a specified row value. |
SQLDMO_DTypeBit, SQLDMO_DTypeFloat8, SQLDMO_DTypeInt1, SQLDMO_DTypeInt2, SQLDMO_DTypeInt4, SQLDMO_DTypeMoney, or SQLDMO_DTypeMoney4 |
The maximum precision of a value of the type. |
SQLDMO_DTypeChar, SQLDMO_DTypeVarchar, SQLDMO_DTypeUChar, or SQLDMO_DTypeUVarchar |
The count of bytes required to represent the data as a Unicode character string (two bytes per character). The count is incremented to include the count of bytes in a string terminator. |
SQLDMO_DTypeDateTime or SQLDMO_DTypeDateTime4 |
A system-defined value. |