ODBC API methods support LOB locators.
SQLBindCol – TargetType can be any of the ODBC C locator datatypes.
SQLBindParameter – ValueType can be any of the ODBC C locator datatypes. ParameterType can be any of the ODBC SQL locator datatypes.
SQLGetData – TargetType can be any of the ODBC C locator datatype.
SQLColAttribute – the SQL_DESC_TYPE and SQL_DESC_CONCISE_TYPE descriptors can return any of the ODBC SQL locator datatype.
SQLDescribeCol – the datatype pointer can be any of the ODBC SQL locator datatypes.
See Microsoft ODBC API Reference.