ignite::cache::query::QueryFieldsCursor Class Reference

Query fields cursor. More...

#include <query_fields_cursor.h>

Public Member Functions
	QueryFieldsCursor ()
	Default constructor. More...
	QueryFieldsCursor (impl::cache::query::QueryCursorImpl *impl)
	Constructor. More...
bool	HasNext ()
	Check whether next entry exists. More...
bool	HasNext (IgniteError &err)
	Check whether next entry exists. More...
QueryFieldsRow	GetNext ()
	Get next entry. More...
QueryFieldsRow	GetNext (IgniteError &err)
	Get next entry. More...
bool	IsValid () const
	Check if the instance is valid. More...

Detailed Description

Query fields cursor.

This class implemented as a reference to an implementation so copying of this class instance will only create another reference to the same underlying object. Underlying object released automatically once all the instances are destructed.

Constructor & Destructor Documentation

QueryFieldsCursor() [1/2]

ignite::cache::query::QueryFieldsCursor::QueryFieldsCursor ( )

inline

Default constructor.

Constructed instance is not valid and thus can not be used as a cursor.

QueryFieldsCursor() [2/2]

ignite::cache::query::QueryFieldsCursor::QueryFieldsCursor ( impl::cache::query::QueryCursorImpl *  impl )

inline

Constructor.

Internal method. Should not be used by user.

Parameters

impl	Implementation.

Member Function Documentation

GetNext() [1/2]

QueryFieldsRow ignite::cache::query::QueryFieldsCursor::GetNext ( )

inline

Get next entry.

This method should only be used on the valid instance.

Returns

Next entry.

Exceptions

IgniteError

class instance in case of failure.

GetNext() [2/2]

QueryFieldsRow ignite::cache::query::QueryFieldsCursor::GetNext ( IgniteError &  err )

inline

Get next entry.

Properly sets error param in case of failure.

This method should only be used on the valid instance.

Parameters

err	Used to set operation result.

Returns

Next entry on success and invalid row instance on failure.

HasNext() [1/2]

bool ignite::cache::query::QueryFieldsCursor::HasNext ( )

inline

Check whether next entry exists.

This method should only be used on the valid instance.

Returns

True if next entry exists.

Exceptions

IgniteError

class instance in case of failure.

HasNext() [2/2]

bool ignite::cache::query::QueryFieldsCursor::HasNext ( IgniteError &  err )

inline

Check whether next entry exists.

Properly sets error param in case of failure.

This method should only be used on the valid instance.

Parameters

err	Used to set operation result.

Returns

True if next entry exists and operation resulted in success. Returns false on failure.

IsValid()

bool ignite::cache::query::QueryFieldsCursor::IsValid ( ) const

inline

Check if the instance is valid.

Invalid instance can be returned if some of the previous operations have resulted in a failure. For example invalid instance can be returned by not-throwing version of method in case of error. Invalid instances also often can be created using default constructor.

Returns

True if the instance is valid and can be used.

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The documentation for this class was generated from the following file:

• query_fields_cursor.h