QxOrm  1.4.7
C++ Object Relational Mapping library
QxOrm - C++ Object Relational Mapping library

QxOrm is a C++ library designed to provide Object Relational Mapping (ORM) feature to C++/Qt developers (like Hibernate in Java, or NHibernate in .Net).
QxOrm engine is based on a simple and non intrusive mapping function per class to provide :

  • Persistence (based on QtSql Qt module) ;
  • Serialization (JSON, XML and binary, based on Qt and boost serialization engines) ;
  • Reflection or Introspection (invoke dynamically class methods and access to properties) ;
  • HTTP web server : standalone multi-threaded HTTP 1.1 web server (support SSL/TLS, persistent connections, cookies, sessions, chunked responses, URL dispatcher/routing) ;
  • JSON API : interoperability with other technology than C++/Qt (REST web services, QML applications, scripting language).

QxOrm is developed by Lionel Marty, a software development engineer since 2003.
QxOrm library has been accepted into the Qt Ambassador Program.
QxOrm library is available on GitHub.

For more information about QxOrm library (quick sample, tutorial and forum), please visit : https://www.qxorm.com/.
A manual (user guide) to learn how to work with QxOrm library is available on QxOrm website.

Quick sample using QxOrm library

1- drug.h file : drug class definition with 3 properties : id, name and description

#ifndef _CLASS_DRUG_H_
#define _CLASS_DRUG_H_

class drug
{
public:
   long id;
   QString name;
   QString description;

   drug() : id(0) { ; }
   virtual ~drug() { ; }
};

QX_REGISTER_HPP_MY_TEST_EXE(drug, qx::trait::no_base_class_defined, 1)

// This macro is necessary to register 'drug' class in QxOrm context
// param 1 : the current class to register => 'drug'
// param 2 : the base class, if no base class, use the qx trait => 'qx::trait::no_base_class_defined'
// param 3 : the class version used by serialization to provide 'ascendant compatibility'

#endif // _CLASS_DRUG_H_


2- drug.cpp file : setting function implementation - void qx::register_class()

#include "precompiled.h"   // Precompiled-header with '#include <QxOrm.h>' and '#include "export.h"'
#include "drug.h"          // Class definition 'drug'
#include <QxOrm_Impl.h>    // Automatic memory leak detection and boost serialization export macro

QX_REGISTER_CPP_MY_TEST_EXE(drug)   // This macro is necessary to register 'drug' class in QxOrm context

namespace qx {
template <> void register_class(QxClass<drug> & t)
{
  t.id(& drug::id, "id");               // Register 'drug::id' <=> primary key in your database
  t.data(& drug::name, "name", 1);      // Register 'drug::name' property with key 'name' and version '1'
  t.data(& drug::description, "desc");  // Register 'drug::description' property with key 'desc'
}}


3- main.cpp file : basic functionalities of QxOrm library with drug class

#include "precompiled.h"
#include "drug.h"
#include <QxOrm_Impl.h>

int main(int argc, char * argv[])
{
   QApplication app(argc, argv); // Qt application

   // Create 3 new drugs
   // It is possible to use 'boost' and 'Qt' smart pointer : 'boost::shared_ptr', 'QSharedPointer', etc...
   typedef std::shared_ptr<drug> drug_ptr;
   drug_ptr d1; d1.reset(new drug()); d1->name = "name1"; d1->description = "desc1";
   drug_ptr d2; d2.reset(new drug()); d2->name = "name2"; d2->description = "desc2";
   drug_ptr d3; d3.reset(new drug()); d3->name = "name3"; d3->description = "desc3";

   // Insert drugs into container
   // It is possible to use a lot of containers from 'std', 'boost', 'Qt' and 'qx::QxCollection<Key, Value>'
   typedef std::vector<drug_ptr> type_lst_drug;
   type_lst_drug lst_drug;
   lst_drug.push_back(d1);
   lst_drug.push_back(d2);
   lst_drug.push_back(d3);

   // Init parameters to communicate with a database
   qx::QxSqlDatabase::getSingleton()->setDriverName("QSQLITE");
   qx::QxSqlDatabase::getSingleton()->setDatabaseName("./test_qxorm.db");
   qx::QxSqlDatabase::getSingleton()->setHostName("localhost");
   qx::QxSqlDatabase::getSingleton()->setUserName("root");
   qx::QxSqlDatabase::getSingleton()->setPassword("");

   // Create table 'drug' into database to store drugs
   QSqlError daoError = qx::dao::create_table<drug>();

   // Insert drugs from container to database
   // 'id' property of 'd1', 'd2' and 'd3' are auto-updated
   daoError = qx::dao::insert(lst_drug);

   // Modify and update the second drug into database
   d2->name = "name2 modified";
   d2->description = "desc2 modified";
   daoError = qx::dao::update(d2);

   // Delete the first drug from database
   daoError = qx::dao::delete_by_id(d1);

   // Count drugs into database
   long lDrugCount = qx::dao::count<drug>();

   // Fetch drug with id '3' into a new variable
   drug_ptr d_tmp; d_tmp.reset(new drug());
   d_tmp->id = 3;
   daoError = qx::dao::fetch_by_id(d_tmp);

   // Export drugs from container to a file under XML format (serialization)
   qx::serialization::xml::to_file(lst_drug, "./export_drugs.xml");

   // Import drugs from XML file into a new container
   type_lst_drug lst_drug_tmp;
   qx::serialization::xml::from_file(lst_drug_tmp, "./export_drugs.xml");

   // Clone a drug
   drug_ptr d_clone = qx::clone(* d1);

   // Create a new drug by class name (factory)
   qx::any d_any = qx::create("drug");

   // Insert drugs container into 'qx::cache'
   qx::cache::set("drugs", lst_drug);

   // Remove all elements from 'qx::cache'
   qx::cache::clear();

   // Create a dummy memory leak
   drug * pDummy = new drug();

   return 0;
}


4- execute program and trace output debug

[QxOrm] qx::QxSqlDatabase : create new database connection in thread '3616' with key '{d315250c-b5c9-46e0-9402-f800368a6673}'
[QxOrm] sql query (78 ms) : CREATE TABLE drug (id INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT, name TEXT, desc TEXT)
[QxOrm] sql query (63 ms) : INSERT INTO drug (name, desc) VALUES (:name, :desc)
[QxOrm] sql query (62 ms) : UPDATE drug SET id = :id, name = :name, desc = :desc WHERE id = :id_bis
[QxOrm] sql query (63 ms) : DELETE FROM drug WHERE id = :id
[QxOrm] sql query (0 ms) : SELECT COUNT(*) FROM drug
[QxOrm] sql query (0 ms) : SELECT drug.id AS drug_id_0, drug.name AS drug_name_0, drug.desc AS drug_desc_0 FROM drug WHERE drug_id_0 = :id
[QxOrm] Leaked object at 0xf52ad8 (size 16, src\main.cpp:74)
[QxOrm] **** 1 memory leaks found ****


5- export_drugs.xml file created by the program

<std.vector-boost.shared_ptr-drug-- class_id="0" tracking_level="0" version="0">
        <count>3</count>
        <item_version>1</item_version>
        <item class_id="1" tracking_level="0" version="1">
                <px class_id="2" tracking_level="1" version="1" object_id="_0">
                        <id>1</id>
                        <name class_id="3" tracking_level="0" version="0">name1</name>
                        <desc>desc1</desc>
                </px>
        </item>
        <item>
                <px class_id_reference="2" object_id="_1">
                        <id>2</id>
                        <name>name2 modified</name>
                        <desc>desc2 modified</desc>
                </px>
        </item>
        <item>
                <px class_id_reference="2" object_id="_2">
                        <id>3</id>
                        <name>name3</name>
                        <desc>desc3</desc>
                </px>
        </item>
</std.vector-boost.shared_ptr-drug-->