Note
Access to this page requires authorization. You can try signing in or changing directories.
Access to this page requires authorization. You can try changing directories.
Providers must be able to convert bound data values as follows:
To the native type used by the provider for the column or parameter, as returned by IColumnsInfo::GetColumnInfo or ICommandWithParameters::GetParameterInfo. Such transfers must be performed without loss of data.
To and from DBTYPE_WSTR if such a conversion is defined by OLE DB. For more information, see Conversion Tables in Appendix A: Data Types. Conversions to and from DBTYPE_WSTR are defined for virtually all types.
Support for additional conversions is optional and might result in truncation of data or a conversion error. The consumer can determine what conversions a provider supports by calling IConvertType::CanConvert with the indicators for the "to" and "from" types. If a provider offers additional functions that the consumer can call to convert data types, these functions are described in a type library pointed to by the PROVIDER_TYPES schema rowset.
For more information about how data is converted, see Data Type Conversion Rules in Appendix A: Data Types.