MDMultiQuery Class Reference

#include <metadata_query.h>

Inheritance diagram for MDMultiQuery:

Collaboration diagram for MDMultiQuery:

Public Member Functions
	MDMultiQuery (int limit=-1, int offset=0, MDLabel orderLabel=MDL_OBJID)
void	addAndQuery (MDQuery &query)
void	addOrQuery (MDQuery &query)
void	clear ()
virtual String	queryStringFunc () const
Public Member Functions inherited from MDQuery
	MDQuery (int limit=-1, int offset=0, MDLabel orderLabel=MDL_OBJID, bool asc=true)
virtual	~MDQuery ()
String	orderByString () const
String	limitString () const
String	whereString () const

Public Attributes
std::vector< const MDQuery * >	queries
std::vector< String >	operations
Public Attributes inherited from MDQuery
int	limit
	If distint of -1 the results will be limited to this value. More...
int	offset
	If distint of 0, offset elements will be discarded. More...
MDLabel	orderLabel
	Label to which apply sort of the results. More...
bool	asc

Detailed Description

Query several conditions using AND and OR. This kind of query if useful if you want to check two conditions at the same time, for example, import all images that are enabled and have rotational angle greater than 100.

MetaData md1, md2;
MDValueEQ eq(MDL_ENABLED, 1);
MDValueGT gt(MDL_ANGLE_ROT, 100.);
MDMultiQuery multi;
//The first query added has the same effect doing with AND or OR
multi.addAndQuery(eq);
multi.addAndQuery(gt);

md1.importObjects(md2, multi);

Definition at line 334 of file metadata_query.h.

Constructor & Destructor Documentation

MDMultiQuery()

MDMultiQuery::MDMultiQuery ( int  limit = -1, int  offset = 0, MDLabel  orderLabel = MDL_OBJID  )

inline

Definition at line 340 of file metadata_query.h.

                                                                                :MDQuery(limit, offset, orderLabel)
    {
        clear();
    }

Member Function Documentation

addAndQuery()

void MDMultiQuery::addAndQuery ( MDQuery &  query )

inline

Definition at line 344 of file metadata_query.h.

    {
        queries.emplace_back(&query);
        operations.emplace_back("AND");
    }

addOrQuery()

void MDMultiQuery::addOrQuery ( MDQuery &  query )

inline

Definition at line 349 of file metadata_query.h.

    {
        queries.emplace_back(&query);
        operations.emplace_back("OR");
    }

clear()

void MDMultiQuery::clear ( )

inline

Definition at line 355 of file metadata_query.h.

    {
        queries.clear();
        operations.clear();
    }

queryStringFunc()

String MDMultiQuery::queryStringFunc ( ) const

virtual

Return the query string, should be overrided in subclasses

Reimplemented from MDQuery.

Definition at line 22 of file metadata_query.cpp.

{
    if (queries.size() > 0)
    {
        std::stringstream ss;
        ss << "(" << queries[0]->queryStringFunc() << ") ";
        for (size_t i = 1; i < queries.size(); i++)
            ss << operations[i] << " (" << queries[i]->queryStringFunc() << ") ";

        return ss.str();
    }
    return " ";
}

Member Data Documentation

operations

std::vector<String> MDMultiQuery::operations

Definition at line 338 of file metadata_query.h.

queries

std::vector<const MDQuery*> MDMultiQuery::queries

Definition at line 337 of file metadata_query.h.

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

• xmippCore/core/metadata_query.h
• xmippCore/core/metadata_query.cpp