Library: Data
Package: DataCore
Header: Poco/Data/AbstractExtractor.h
Interface used to extract data from a single result row. If an extractor receives null it is not allowed to change val!
Known Derived Classes: Poco::Data::MySQL::Extractor, Poco::Data::ODBC::Extractor, Poco::Data::SQLite::Extractor
Member Functions: extract
Creates the AbstractExtractor.
 
 virtual ~AbstractExtractor();
Destroys the AbstractExtractor.
 
 virtual bool extract(
    std::size_t pos,
    Poco::Int8 & val
) = 0;
Extracts an Int8. Returns false if null was received.
 
 virtual bool extract(
    std::size_t pos,
    Poco::UInt8 & val
) = 0;
Extracts an UInt8. Returns false if null was received.
 
 virtual bool extract(
    std::size_t pos,
    Poco::Int16 & val
) = 0;
Extracts an Int16. Returns false if null was received.
 
 virtual bool extract(
    std::size_t pos,
    Poco::UInt16 & val
) = 0;
Extracts an UInt16. Returns false if null was received.
 
 virtual bool extract(
    std::size_t pos,
    Poco::Int32 & val
) = 0;
Extracts an Int32. Returns false if null was received.
 
 virtual bool extract(
    std::size_t pos,
    Poco::UInt32 & val
) = 0;
Extracts an UInt32. Returns false if null was received.
 
 virtual bool extract(
    std::size_t pos,
    Poco::Int64 & val
) = 0;
Extracts an Int64. Returns false if null was received.
 
 virtual bool extract(
    std::size_t pos,
    Poco::UInt64 & val
) = 0;
Extracts an UInt64. Returns false if null was received.
 
 virtual bool extract(
    std::size_t pos,
    bool & val
) = 0;
Extracts a boolean. Returns false if null was received.
 
 virtual bool extract(
    std::size_t pos,
    float & val
) = 0;
Extracts a float. Returns false if null was received.
 
 virtual bool extract(
    std::size_t pos,
    double & val
) = 0;
Extracts a double. Returns false if null was received.
 
 virtual bool extract(
    std::size_t pos,
    char & val
) = 0;
Extracts a single character. Returns false if null was received.
 
 virtual bool extract(
    std::size_t pos,
    std::string & val
) = 0;
Extracts a string. Returns false if null was received.
 
 virtual bool extract(
    std::size_t pos,
    BLOB & val
) = 0;
Extracts a BLOB. Returns false if null was received.