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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    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_