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QxSqlRelation_ManyToMany.h
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    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 :
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    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
    00067    enum { is_data_container = QxSqlRelation<DataType, Owner>::is_data_container };
    00068
    00069 public:
    00070
    00071    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(); }
    00072    virtual ~QxSqlRelation_ManyToMany() { BOOST_STATIC_ASSERT(is_data_container); }
    00073
    00074    virtual QString getDescription() const                                     { return "relation many-to-many"; }
    00075    virtual QString getExtraTable() const                                      { return this->m_sExtraTable; }
    00076    virtual bool getCartesianProduct() const                                   { return true; }
    00077    virtual void createTable(QxSqlRelationParams & params) const               { Q_UNUSED(params); }
    00078    virtual void lazySelect(QxSqlRelationParams & params) const                { Q_UNUSED(params); }
    00079    virtual void lazyFrom(QxSqlRelationParams & params) const                  { Q_UNUSED(params); }
    00080    virtual void eagerFrom(QxSqlRelationParams & params) const                 { Q_UNUSED(params); }
    00081    virtual void lazyJoin(QxSqlRelationParams & params) const                  { Q_UNUSED(params); }
    00082    virtual void lazyWhere(QxSqlRelationParams & params) const                 { Q_UNUSED(params); }
    00083    virtual void eagerWhere(QxSqlRelationParams & params) const                { Q_UNUSED(params); }
    00084    virtual void lazyWhereSoftDelete(QxSqlRelationParams & params) const       { Q_UNUSED(params); }
    00085    virtual void lazyFetch_ResolveInput(QxSqlRelationParams & params) const    { Q_UNUSED(params); }
    00086    virtual void eagerFetch_ResolveInput(QxSqlRelationParams & params) const   { Q_UNUSED(params); }
    00087    virtual void lazyFetch_ResolveOutput(QxSqlRelationParams & params) const   { Q_UNUSED(params); }
    00088    virtual void lazyInsert(QxSqlRelationParams & params) const                { Q_UNUSED(params); }
    00089    virtual void lazyInsert_Values(QxSqlRelationParams & params) const         { Q_UNUSED(params); }
    00090    virtual void lazyUpdate(QxSqlRelationParams & params) const                { Q_UNUSED(params); }
    00091    virtual void lazyInsert_ResolveInput(QxSqlRelationParams & params) const   { Q_UNUSED(params); }
    00092    virtual void lazyUpdate_ResolveInput(QxSqlRelationParams & params) const   { Q_UNUSED(params); }
    00093    virtual QSqlError onBeforeSave(QxSqlRelationParams & params) const         { Q_UNUSED(params); return QSqlError(); }
    00094
    00095    virtual QVariant getIdFromQuery(bool bEager, QxSqlRelationParams & params) const
    00096    { return this->getIdFromQuery_ManyToMany(bEager, params); }
    00097
    00098    virtual void updateOffset(bool bEager, QxSqlRelationParams & params) const
    00099    { this->updateOffset_ManyToMany(bEager, params); }
    00100
    00101    virtual void eagerSelect(QxSqlRelationParams & params) const
    00102    { this->eagerSelect_ManyToMany(params); }
    00103
    00104    virtual void eagerJoin(QxSqlRelationParams & params) const
    00105    { this->eagerJoin_ManyToMany(params); }
    00106
    00107    virtual void eagerWhereSoftDelete(QxSqlRelationParams & params) const
    00108    { this->eagerWhereSoftDelete_ManyToMany(params); }
    00109
    00110    virtual void * eagerFetch_ResolveOutput(QxSqlRelationParams & params) const
    00111    {
    00112       if (! this->verifyOffset(params, true)) { return NULL; }
    00113       QSqlQuery & query = params.query();
    00114       IxDataMember * p = NULL; IxDataMember * pId = this->getDataId(); qAssert(pId);
    00115       long lIndex = 0; long lOffsetId = (pId ? pId->getNameCount() : 0); bool bValidId(false);
    00116       long lOffsetOld = params.offset(); this->updateOffset(true, params);
    00117       long lRelation = 0; IxSqlRelation * pRelation = NULL;
    00118       for (int i = 0; i < pId->getNameCount(); i++)
    00119       { QVariant v = query.value(lOffsetOld + i); bValidId = (bValidId || qx::trait::is_valid_primary_key(v)); }
    00120       if (! bValidId) { return NULL; }
    00121       type_item item = this->createItem();
    00122       type_data & item_val = item.value_qx();
    00123       if (! this->callTriggerBeforeFetch(item_val, params)) { return NULL; }
    00124       for (int i = 0; i < pId->getNameCount(); i++)
    00125       { QVariant v = query.value(lOffsetOld + i); qx::cvt::from_variant(v, item.key(), "", i); }
    00126       for (int i = 0; i < pId->getNameCount(); i++)
    00127       { QVariant v = query.value(lOffsetOld + i); pId->fromVariant((& item_val), v, "", i); }
    00128       while ((p = this->nextData(lIndex)))
    00129       { p->fromVariant((& item_val), query.value(lIndex + lOffsetOld + lOffsetId - 1)); }
    00130
    00131       if (params.relationX())
    00132       {
    00133          long lOffsetCurrent = (lIndex + lOffsetOld + lOffsetId);
    00134          long lIndexOwnerOld = params.indexOwner(); params.setIndexOwner(params.index());
    00135          void * pOwnerOld = params.owner(); params.setOwner(& item_val);
    00136          lOffsetOld = params.offset(); params.setOffset(lOffsetCurrent);
    00137          while ((pRelation = this->nextRelation(lRelation)))
    00138          { if (this->addLazyRelation(params, pRelation)) { pRelation->lazyFetch_ResolveOutput(params); } }
    00139          params.setOwner(pOwnerOld); params.setOffset(lOffsetOld);
    00140          params.setIndexOwner(lIndexOwnerOld);
    00141       }
    00142
    00143       if (! this->callTriggerAfterFetch(item_val, params)) { return NULL; }
    00144       type_generic_container::insertItem(this->getContainer(params), item);
    00145       return (& item_val);
    00146    }
    00147
    00148    virtual QSqlError onAfterSave(QxSqlRelationParams & params) const
    00149    {
    00150       if (this->isNullData(params)) { return this->deleteFromExtraTable(params); }
    00151       QSqlError daoError = qx::dao::save(this->getContainer(params), (& params.database()));
    00152       if (daoError.isValid()) { return daoError; }
    00153       daoError = this->deleteFromExtraTable(params);
    00154       if (daoError.isValid()) { return daoError; }
    00155       daoError = this->insertIntoExtraTable(params);
    00156       if (daoError.isValid()) { return daoError; }
    00157       return QSqlError();
    00158    }
    00159
    00160    virtual QString createExtraTable() const
    00161    { return this->createExtraTable_ManyToMany(); }
    00162
    00163 private:
    00164
    00165    inline void verifyParameters()
    00166    { qAssert(! this->m_sExtraTable.isEmpty() && ! this->m_sForeignKeyOwner.isEmpty() && ! this->m_sForeignKeyDataType.isEmpty() && (this->m_sForeignKeyOwner != this->m_sForeignKeyDataType)); }
    00167
    00168    QSqlError deleteFromExtraTable(QxSqlRelationParams & params) const
    00169    { return this->deleteFromExtraTable_ManyToMany(params); }
    00170
    00171    QSqlError insertIntoExtraTable(QxSqlRelationParams & params) const
    00172    {
    00173       IxDataMember * pIdOwner = this->getDataIdOwner(); qAssert(pIdOwner);
    00174       IxDataMember * pIdData = this->getDataId(); qAssert(pIdData);
    00175       if (! pIdOwner || ! pIdData) { return QSqlError(); }
    00176       QStringList lstForeignKeyOwner = this->m_sForeignKeyOwner.split("|");
    00177       QStringList lstForeignKeyDataType = this->m_sForeignKeyDataType.split("|");
    00178       qAssert(pIdOwner->getNameCount() == lstForeignKeyOwner.count());
    00179       qAssert(pIdData->getNameCount() == lstForeignKeyDataType.count());
    00180
    00181       QString sql = "INSERT INTO " + this->m_sExtraTable + " (";
    00182       sql += pIdOwner->getSqlName(", ", this->m_sForeignKeyOwner) + ", " + pIdData->getSqlName(", ", this->m_sForeignKeyDataType);
    00183       sql += ") VALUES (";
    00184       sql += pIdOwner->getSqlPlaceHolder("", -1, ", ", this->m_sForeignKeyOwner) + ", " + pIdData->getSqlPlaceHolder("", -1, ", ", this->m_sForeignKeyDataType) + ")";
    00185       if (this->traceSqlQuery()) { qDebug("[QxOrm] sql query (extra-table) : %s", qPrintable(sql)); }
    00186
    00187       type_item item;
    00188       type_container & container = this->getContainer(params);
    00189       type_iterator itr = type_generic_container::begin(container, item);
    00190       type_iterator itr_end = type_generic_container::end(container);
    00191       QSqlQuery queryInsert(params.database());
    00192       queryInsert.prepare(sql);
    00193
    00194       while (itr != itr_end)
    00195       {
    00196          pIdOwner->setSqlPlaceHolder(queryInsert, params.owner(), "", this->m_sForeignKeyOwner);
    00197          pIdData->setSqlPlaceHolder(queryInsert, (& item.value_qx()), "", this->m_sForeignKeyDataType);
    00198          if (! queryInsert.exec()) { return queryInsert.lastError(); }
    00199          itr = type_generic_container::next(container, itr, item);
    00200       }
    00201
    00202       return QSqlError();
    00203    }
    00204
    00205 };
    00206
    00207 } // namespace qx
    00208
    00209 #endif // _QX_SQL_RELATION_MANY_TO_MANY_H_