QxOrm  1.4.2
C++ Object Relational Mapping library
QxSqlRelation_ManyToMany.h
Go to the documentation of this file.
00001 /****************************************************************************
00002 **
00003 ** http://www.qxorm.com/
00004 ** Copyright (C) 2013 Lionel Marty (contact@qxorm.com)
00005 **
00006 ** This file is part of the QxOrm library
00007 **
00008 ** This software is provided 'as-is', without any express or implied
00009 ** warranty. In no event will the authors be held liable for any
00010 ** damages arising from the use of this software
00011 **
00012 ** Commercial Usage
00013 ** Licensees holding valid commercial QxOrm licenses may use this file in
00014 ** accordance with the commercial license agreement provided with the
00015 ** Software or, alternatively, in accordance with the terms contained in
00016 ** a written agreement between you and Lionel Marty
00017 **
00018 ** GNU General Public License Usage
00019 ** Alternatively, this file may be used under the terms of the GNU
00020 ** General Public License version 3.0 as published by the Free Software
00021 ** Foundation and appearing in the file 'license.gpl3.txt' included in the
00022 ** packaging of this file. Please review the following information to
00023 ** ensure the GNU General Public License version 3.0 requirements will be
00024 ** met : http://www.gnu.org/copyleft/gpl.html
00025 **
00026 ** If you are unsure which license is appropriate for your use, or
00027 ** if you have questions regarding the use of this file, please contact :
00028 ** contact@qxorm.com
00029 **
00030 ****************************************************************************/
00031 
00032 #ifndef _QX_SQL_RELATION_MANY_TO_MANY_H_
00033 #define _QX_SQL_RELATION_MANY_TO_MANY_H_
00034 
00035 #ifdef _MSC_VER
00036 #pragma once
00037 #endif
00038 
00046 #include <QxDao/QxSqlRelation.h>
00047 
00048 namespace qx {
00049 
00054 template <class DataType, class Owner>
00055 class QxSqlRelation_ManyToMany : public QxSqlRelation<DataType, Owner>
00056 {
00057 
00058 private:
00059 
00060    typedef typename QxSqlRelation<DataType, Owner>::type_owner type_owner;
00061    typedef typename QxSqlRelation<DataType, Owner>::type_data type_data;
00062    typedef typename QxSqlRelation<DataType, Owner>::type_container type_container;
00063    typedef typename QxSqlRelation<DataType, Owner>::type_generic_container type_generic_container;
00064    typedef typename QxSqlRelation<DataType, Owner>::type_item type_item;
00065    typedef typename type_generic_container::type_iterator type_iterator;
00066    typedef typename type_item::type_value type_value;
00067 
00068    enum { is_data_container = QxSqlRelation<DataType, Owner>::is_data_container };
00069 
00070 public:
00071 
00072    QxSqlRelation_ManyToMany(IxDataMember * p, const QString & sExtraTable, const QString & sForeignKeyOwner, const QString & sForeignKeyDataType) : QxSqlRelation<DataType, Owner>(p) { this->m_eRelationType = qx::IxSqlRelation::many_to_many; this->m_sExtraTable = sExtraTable; this->m_sForeignKeyOwner = sForeignKeyOwner; this->m_sForeignKeyDataType = sForeignKeyDataType; this->verifyParameters(); }
00073    virtual ~QxSqlRelation_ManyToMany() { BOOST_STATIC_ASSERT(is_data_container); }
00074 
00075    virtual QString getDescription() const                                     { return "relation many-to-many"; }
00076    virtual QString getExtraTable() const                                      { return this->m_sExtraTable; }
00077    virtual bool getCartesianProduct() const                                   { return true; }
00078    virtual void createTable(QxSqlRelationParams & params) const               { Q_UNUSED(params); }
00079    virtual void lazySelect(QxSqlRelationParams & params) const                { Q_UNUSED(params); }
00080    virtual void lazyFrom(QxSqlRelationParams & params) const                  { Q_UNUSED(params); }
00081    virtual void eagerFrom(QxSqlRelationParams & params) const                 { Q_UNUSED(params); }
00082    virtual void lazyJoin(QxSqlRelationParams & params) const                  { Q_UNUSED(params); }
00083    virtual void lazyWhere(QxSqlRelationParams & params) const                 { Q_UNUSED(params); }
00084    virtual void eagerWhere(QxSqlRelationParams & params) const                { Q_UNUSED(params); }
00085    virtual void lazyWhereSoftDelete(QxSqlRelationParams & params) const       { Q_UNUSED(params); }
00086    virtual void lazyFetch_ResolveInput(QxSqlRelationParams & params) const    { Q_UNUSED(params); }
00087    virtual void eagerFetch_ResolveInput(QxSqlRelationParams & params) const   { Q_UNUSED(params); }
00088    virtual void lazyFetch_ResolveOutput(QxSqlRelationParams & params) const   { Q_UNUSED(params); }
00089    virtual void lazyInsert(QxSqlRelationParams & params) const                { Q_UNUSED(params); }
00090    virtual void lazyInsert_Values(QxSqlRelationParams & params) const         { Q_UNUSED(params); }
00091    virtual void lazyUpdate(QxSqlRelationParams & params) const                { Q_UNUSED(params); }
00092    virtual void lazyInsert_ResolveInput(QxSqlRelationParams & params) const   { Q_UNUSED(params); }
00093    virtual void lazyUpdate_ResolveInput(QxSqlRelationParams & params) const   { Q_UNUSED(params); }
00094    virtual QSqlError onBeforeSave(QxSqlRelationParams & params) const         { Q_UNUSED(params); return QSqlError(); }
00095 
00096    virtual QVariant getIdFromQuery(bool bEager, QxSqlRelationParams & params) const
00097    { return this->getIdFromQuery_ManyToMany(bEager, params); }
00098 
00099    virtual void updateOffset(bool bEager, QxSqlRelationParams & params) const
00100    { this->updateOffset_ManyToMany(bEager, params); }
00101 
00102    virtual void eagerSelect(QxSqlRelationParams & params) const
00103    { this->eagerSelect_ManyToMany(params); }
00104 
00105    virtual void eagerJoin(QxSqlRelationParams & params) const
00106    { this->eagerJoin_ManyToMany(params); }
00107 
00108    virtual void eagerWhereSoftDelete(QxSqlRelationParams & params) const
00109    { this->eagerWhereSoftDelete_ManyToMany(params); }
00110 
00111    virtual void * eagerFetch_ResolveOutput(QxSqlRelationParams & params) const
00112    {
00113       if (! this->verifyOffset(params, true)) { return NULL; }
00114       QSqlQuery & query = params.query();
00115       IxDataMember * p = NULL; IxDataMember * pId = this->getDataId(); qAssert(pId);
00116       long lIndex = 0; long lOffsetId = (pId ? pId->getNameCount() : 0); bool bValidId(false);
00117       long lOffsetOld = params.offset(); this->updateOffset(true, params);
00118       long lRelation = 0; IxSqlRelation * pRelation = NULL;
00119       for (int i = 0; i < pId->getNameCount(); i++)
00120       { QVariant v = query.value(lOffsetOld + i); bValidId = (bValidId || qx::trait::is_valid_primary_key(v)); }
00121       if (! bValidId) { return NULL; }
00122       type_item item = this->createItem();
00123       type_data & item_val = item.value_qx();
00124       if (! this->callTriggerBeforeFetch(item_val, params)) { return NULL; }
00125       for (int i = 0; i < pId->getNameCount(); i++)
00126       { QVariant v = query.value(lOffsetOld + i); qx::cvt::from_variant(v, item.key(), "", i); }
00127       for (int i = 0; i < pId->getNameCount(); i++)
00128       { QVariant v = query.value(lOffsetOld + i); pId->fromVariant((& item_val), v, "", i); }
00129       long lOffsetRelation = (lOffsetOld + lOffsetId); long lCurrIndex = 0;
00130       while ((p = this->nextData(lIndex)))
00131       { if (params.checkColumns(p->getKey())) { p->fromVariant((& item_val), query.value(lCurrIndex + lOffsetRelation)); lCurrIndex++; } }
00132 
00133       if (params.relationX())
00134       {
00135          long lOffsetCurrent = (lCurrIndex + lOffsetRelation);
00136          long lIndexOwnerOld = params.indexOwner(); params.setIndexOwner(params.index());
00137          void * pOwnerOld = params.owner(); params.setOwner(& item_val);
00138          lOffsetOld = params.offset(); params.setOffset(lOffsetCurrent);
00139          while ((pRelation = this->nextRelation(lRelation)))
00140          { if (this->addLazyRelation(params, pRelation)) { pRelation->lazyFetch_ResolveOutput(params); } }
00141          params.setOwner(pOwnerOld); params.setOffset(lOffsetOld);
00142          params.setIndexOwner(lIndexOwnerOld);
00143       }
00144 
00145       if (! this->callTriggerAfterFetch(item_val, params)) { return NULL; }
00146       type_value * pValue = type_generic_container::insertItem(this->getContainer(params), item);
00147       if (! type_item::is_value_pointer && pValue) { return pValue; }
00148       return (& item_val);
00149    }
00150 
00151    virtual QSqlError onAfterSave(QxSqlRelationParams & params) const
00152    {
00153       QSqlError daoError;
00154       if (this->isNullData(params)) { return this->deleteFromExtraTable(params); }
00155       if (! params.recursiveMode()) { daoError = qx::dao::save(this->getContainer(params), (& params.database())); }
00156       else { daoError = qx::dao::save_with_relation_recursive(this->getContainer(params), params.saveMode(), (& params.database()), (& params)); }
00157       if (daoError.isValid()) { return daoError; }
00158       daoError = this->deleteFromExtraTable(params);
00159       if (daoError.isValid()) { return daoError; }
00160       daoError = this->insertIntoExtraTable(params);
00161       if (daoError.isValid()) { return daoError; }
00162       return QSqlError();
00163    }
00164 
00165    virtual QString createExtraTable() const
00166    { return this->createExtraTable_ManyToMany(); }
00167 
00168 private:
00169 
00170    inline void verifyParameters()
00171    { qAssert(! this->m_sExtraTable.isEmpty() && ! this->m_sForeignKeyOwner.isEmpty() && ! this->m_sForeignKeyDataType.isEmpty() && (this->m_sForeignKeyOwner != this->m_sForeignKeyDataType)); }
00172 
00173    QSqlError deleteFromExtraTable(QxSqlRelationParams & params) const
00174    { return this->deleteFromExtraTable_ManyToMany(params); }
00175 
00176    QSqlError insertIntoExtraTable(QxSqlRelationParams & params) const
00177    {
00178       IxDataMember * pIdOwner = this->getDataIdOwner(); qAssert(pIdOwner);
00179       IxDataMember * pIdData = this->getDataId(); qAssert(pIdData);
00180       if (! pIdOwner || ! pIdData) { return QSqlError(); }
00181       QStringList lstForeignKeyOwner = this->m_sForeignKeyOwner.split("|");
00182       QStringList lstForeignKeyDataType = this->m_sForeignKeyDataType.split("|");
00183       qAssert(pIdOwner->getNameCount() == lstForeignKeyOwner.count());
00184       qAssert(pIdData->getNameCount() == lstForeignKeyDataType.count());
00185 
00186       QString sql = "INSERT INTO " + this->m_sExtraTable + " (";
00187       sql += pIdOwner->getSqlName(", ", this->m_sForeignKeyOwner) + ", " + pIdData->getSqlName(", ", this->m_sForeignKeyDataType);
00188       sql += ") VALUES (";
00189       sql += pIdOwner->getSqlPlaceHolder("", -1, ", ", this->m_sForeignKeyOwner) + ", " + pIdData->getSqlPlaceHolder("", -1, ", ", this->m_sForeignKeyDataType) + ")";
00190       if (this->traceSqlQuery()) { qDebug("[QxOrm] sql query (extra-table) : %s", qPrintable(sql)); }
00191 
00192       type_item item;
00193       type_container & container = this->getContainer(params);
00194       type_iterator itr = type_generic_container::begin(container, item);
00195       type_iterator itr_end = type_generic_container::end(container);
00196       QSqlQuery queryInsert(params.database());
00197       queryInsert.prepare(sql);
00198 
00199       while (itr != itr_end)
00200       {
00201          pIdOwner->setSqlPlaceHolder(queryInsert, params.owner(), "", this->m_sForeignKeyOwner);
00202          pIdData->setSqlPlaceHolder(queryInsert, (& item.value_qx()), "", this->m_sForeignKeyDataType);
00203          if (! queryInsert.exec()) { return queryInsert.lastError(); }
00204          itr = type_generic_container::next(container, itr, item);
00205       }
00206 
00207       return QSqlError();
00208    }
00209 
00210 };
00211 
00212 } // namespace qx
00213 
00214 #endif // _QX_SQL_RELATION_MANY_TO_MANY_H_