QxSqlRelation_OneToMany.h

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/****************************************************************************
**
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** Copyright (C) 2013 Lionel Marty (contact@qxorm.com)
**
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#ifndef _QX_SQL_RELATION_ONE_TO_MANY_H_
#define _QX_SQL_RELATION_ONE_TO_MANY_H_

#ifdef _MSC_VER
#pragma once
#endif

#include <QxDao/QxSqlRelation.h>

namespace qx {

template <class DataType, class Owner>
class QxSqlRelation_OneToMany : public QxSqlRelation<DataType, Owner>
{

private:

   typedef typename QxSqlRelation<DataType, Owner>::type_owner type_owner;
   typedef typename QxSqlRelation<DataType, Owner>::type_data type_data;
   typedef typename QxSqlRelation<DataType, Owner>::type_container type_container;
   typedef typename QxSqlRelation<DataType, Owner>::type_generic_container type_generic_container;
   typedef typename QxSqlRelation<DataType, Owner>::type_item type_item;

   enum { is_data_container = QxSqlRelation<DataType, Owner>::is_data_container };

public:

   QxSqlRelation_OneToMany(IxDataMember * p, const QString & sForeignKey) : QxSqlRelation<DataType, Owner>(p) { this->m_eRelationType = qx::IxSqlRelation::one_to_many; this->m_sForeignKey = sForeignKey; qAssert(! this->m_sForeignKey.isEmpty()); }
   virtual ~QxSqlRelation_OneToMany() { BOOST_STATIC_ASSERT(is_data_container); }

   virtual QString getDescription() const                                     { return "relation one-to-many"; }
   virtual QString getExtraTable() const                                      { return ""; }
   virtual QString createExtraTable() const                                   { return ""; }
   virtual bool getCartesianProduct() const                                   { return true; }
   virtual void createTable(QxSqlRelationParams & params) const               { Q_UNUSED(params); }
   virtual void lazySelect(QxSqlRelationParams & params) const                { Q_UNUSED(params); }
   virtual void lazyFrom(QxSqlRelationParams & params) const                  { Q_UNUSED(params); }
   virtual void eagerFrom(QxSqlRelationParams & params) const                 { Q_UNUSED(params); }
   virtual void lazyJoin(QxSqlRelationParams & params) const                  { Q_UNUSED(params); }
   virtual void lazyWhere(QxSqlRelationParams & params) const                 { Q_UNUSED(params); }
   virtual void eagerWhere(QxSqlRelationParams & params) const                { Q_UNUSED(params); }
   virtual void lazyWhereSoftDelete(QxSqlRelationParams & params) const       { Q_UNUSED(params); }
   virtual void lazyFetch_ResolveInput(QxSqlRelationParams & params) const    { Q_UNUSED(params); }
   virtual void eagerFetch_ResolveInput(QxSqlRelationParams & params) const   { Q_UNUSED(params); }
   virtual void lazyFetch_ResolveOutput(QxSqlRelationParams & params) const   { Q_UNUSED(params); }
   virtual void lazyInsert(QxSqlRelationParams & params) const                { Q_UNUSED(params); }
   virtual void lazyInsert_Values(QxSqlRelationParams & params) const         { Q_UNUSED(params); }
   virtual void lazyUpdate(QxSqlRelationParams & params) const                { Q_UNUSED(params); }
   virtual void lazyInsert_ResolveInput(QxSqlRelationParams & params) const   { Q_UNUSED(params); }
   virtual void lazyUpdate_ResolveInput(QxSqlRelationParams & params) const   { Q_UNUSED(params); }
   virtual QSqlError onBeforeSave(QxSqlRelationParams & params) const         { Q_UNUSED(params); return QSqlError(); }

   virtual QSqlError onAfterSave(QxSqlRelationParams & params) const
   {
      if (this->isNullData(params)) { return QSqlError(); }
      return qx::dao::save(this->getContainer(params), (& params.database()));
   }

   virtual QVariant getIdFromQuery(bool bEager, QxSqlRelationParams & params) const
   { return this->getIdFromQuery_OneToMany(bEager, params); }

   virtual void updateOffset(bool bEager, QxSqlRelationParams & params) const
   { this->updateOffset_OneToMany(bEager, params); }

   virtual void eagerSelect(QxSqlRelationParams & params) const
   { this->eagerSelect_OneToMany(params); }

   virtual void eagerJoin(QxSqlRelationParams & params) const
   { this->eagerJoin_OneToMany(params); }

   virtual void eagerWhereSoftDelete(QxSqlRelationParams & params) const
   { this->eagerWhereSoftDelete_OneToMany(params); }

   virtual void * eagerFetch_ResolveOutput(QxSqlRelationParams & params) const
   {
      if (! this->verifyOffset(params, true)) { return NULL; }
      QSqlQuery & query = params.query();
      IxDataMember * p = NULL; IxDataMember * pId = this->getDataId(); qAssert(pId); if (! pId) { return NULL; }
      IxDataMember * pForeign = this->getDataByKey(this->m_sForeignKey); qAssert(pForeign); if (! pForeign) { return NULL; }
      long lIndex = 0; long lOffsetId = (pId ? pId->getNameCount() : 0); long lOffsetForeign = (pForeign ? pForeign->getNameCount() : 0);
      long lOffsetOld = params.offset(); this->updateOffset(true, params);
      long lOffsetRelation = (lOffsetOld + lOffsetId + lOffsetForeign);
      long lRelation = 0; IxSqlRelation * pRelation = NULL;
      bool bValidId(false), bValidForeign(false);
      for (int i = 0; i < pId->getNameCount(); i++)
      { QVariant vId = query.value(lOffsetOld + i); bValidId = (bValidId || qx::trait::is_valid_primary_key(vId)); }
      for (int i = 0; i < pForeign->getNameCount(); i++)
      { QVariant vForeign = query.value(lOffsetOld + lOffsetId + i); bValidForeign = (bValidForeign || qx::trait::is_valid_primary_key(vForeign)); }
      if (! bValidId || ! bValidForeign) { return NULL; }
      type_item item = this->createItem();
      type_data & item_val = item.value_qx();
      if (! this->callTriggerBeforeFetch(item_val, params)) { return NULL; }
      for (int i = 0; i < pId->getNameCount(); i++)
      { QVariant v = query.value(lOffsetOld + i); qx::cvt::from_variant(v, item.key(), "", i); }
      for (int i = 0; i < pId->getNameCount(); i++)
      { QVariant v = query.value(lOffsetOld + i); pId->fromVariant((& item_val), v, "", i); }
      for (int i = 0; i < pForeign->getNameCount(); i++)
      { QVariant v = query.value(lOffsetOld + lOffsetId + i); pForeign->fromVariant((& item_val), v, "", i); }
      while ((p = this->nextData(lIndex)))
      { if (p != pForeign) { p->fromVariant((& item_val), query.value(lOffsetRelation++)); } }

      if (params.relationX())
      {
         long lIndexOwnerOld = params.indexOwner(); params.setIndexOwner(params.index());
         void * pOwnerOld = params.owner(); params.setOwner(& item_val);
         lOffsetOld = params.offset(); params.setOffset(lOffsetRelation++);
         while ((pRelation = this->nextRelation(lRelation)))
         { if (this->addLazyRelation(params, pRelation)) { pRelation->lazyFetch_ResolveOutput(params); } }
         params.setOwner(pOwnerOld); params.setOffset(lOffsetOld);
         params.setIndexOwner(lIndexOwnerOld);
      }

      if (! this->callTriggerAfterFetch(item_val, params)) { return NULL; }
      type_generic_container::insertItem(this->getContainer(params), item);
      return (& item_val);
   }

};

} // namespace qx

#endif // _QX_SQL_RELATION_ONE_TO_MANY_H_