cbe::QueryChain Class Reference

To do a search for Object combining more than one Container table. More...

#include <QueryChain.h>

Inheritance diagram for cbe::QueryChain:

Classes
struct	Exception

Public Types
using	JoinDelegatePtr = delegate::JoinDelegatePtr

Public Member Functions
QueryChain	join (Container containerToQuery, std::string key1, std::string key2, JoinDelegatePtr joinDelegate)
QueryChain	join (Container containerToQuery, std::string key1, std::string key2, Filter constraints, JoinDelegatePtr joinDelegate)
QueryChain	join (Container containerToQuery, std::string key1, std::string key2, Container containerForResults, JoinDelegatePtr joinDelegate)
QueryChain	join (Container containerToQuery, std::string key1, std::string key2, Filter constraints, Container containerForResults, JoinDelegatePtr joinDelegate)
QueryResult	getQueryResult () const
	QueryChain (cbe::DefaultCtor)
	operator bool () const

Friends
class	CloudBackend
class	Container
class	QueryChainSync

Detailed Description

To do a search for Object combining more than one Container table.

[Async] QueryChain is used when a query() is carried out with a solely QueryDelegate.
Anyway, if a subsequent join() will be used, an additional JoinDelegate is required in the join()-call.

Member Function Documentation

join() [1/4]

QueryChain cbe::QueryChain::join	(	Container	containerToQuery,
		std::string	key1,
		std::string	key2,
		JoinDelegatePtr	joinDelegate
	)

Performs a join request in conjunction with a query, or previous join, to get related items from another container.

Asynchronous version of this service function.

Parameters

containerToQuery	The container of which the join shall be done with.
key1	The key from the previous query on which to perform the join.
key2	The key on objects in containerToQuery on which to perform the join
joinDelegate	Pointer to a JoinDelegate instance, implemented by the user, that receives the response of this query request. I.e., either of the JoinDelegate callback functions onJoinSuccess() or onJoinError() will be called.

join() [2/4]

QueryChain cbe::QueryChain::join	(	Container	containerToQuery,
		std::string	key1,
		std::string	key2,
		Filter	constraints,
		JoinDelegatePtr	joinDelegate
	)

Same as join(Container,std::string,std::string,delegate::JoinDelegatePtr), but with an additional Filter parameter constraints .

Parameters

constraints

A filter that provides any constraints for the query.

join() [3/4]

QueryChain cbe::QueryChain::join	(	Container	containerToQuery,
		std::string	key1,
		std::string	key2,
		Container	containerForResults,
		JoinDelegatePtr	joinDelegate
	)

Same as join(Container,std::string,std::string,delegate::JoinDelegatePtr), but with an additional Container parameter containerForResults .

Parameters

containerForResults

Can be the Container from the previous query if desired items should be from that container.

join() [4/4]

QueryChain cbe::QueryChain::join	(	Container	containerToQuery,
		std::string	key1,
		std::string	key2,
		Filter	constraints,
		Container	containerForResults,
		JoinDelegatePtr	joinDelegate
	)

Same as join(Container,std::string,std::string,Container,delegate::JoinDelegatePtr), but with an additional Filter parameter constraints .

Parameters

constraints

A filter that provides any constraints for the query.

getQueryResult()

QueryResult cbe::QueryChain::getQueryResult

(

)

const

Returns the QueryResult provided to the delegate after the the last query() or join() call. If this method is called before the delegate call, an empty QueryResult is returned.

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

• include/cbe/QueryChain.h