Poco::Data

template < class C >

class InternalBulkExtraction

Library: Data
Package: DataCore
Header: Poco/Data/BulkExtraction.h

Description

Container Data Type specialization extension for extraction of values from a query result set.

This class is intended for PocoData internal use - it is used by StatementImpl to automaticaly create internal BulkExtraction in cases when statement returns data and no external storage was supplied. It is later used by RecordSet to retrieve the fetched data after statement execution. It takes ownership of the Column pointer supplied as constructor argument. Column object, in turn owns the data container pointer.

InternalBulkExtraction objects can not be copied or assigned.

Inheritance

Direct Base Classes: BulkExtraction < C >

All Base Classes: BulkExtraction < C >

Member Summary

Member Functions: column, isNull, reset, value

Types

CValType

typedef typename C::value_type CValType;

Ptr

typedef SharedPtr < Type > Ptr;

Type

typedef InternalBulkExtraction < ValType > Type;

ValPtr

typedef SharedPtr < ValType > ValPtr;

ValType

typedef C ValType;

Constructors

InternalBulkExtraction inline

InternalBulkExtraction(
    C & result,
    Column < C > * pColumn,
    Poco::UInt32 limit,
    const Position & pos = Position (0)
);

Destructor

~InternalBulkExtraction inline

~InternalBulkExtraction();

Member Functions

column inline

const Column < C > & column() const;

isNull inline

bool isNull(
    std::size_t row
) const;

reset inline

void reset();

value inline

const CValType & value(
    int index
) const;