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233 lines
12 KiB
233 lines
12 KiB
4 days ago
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/****************************************************************************
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**
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** https://www.qxorm.com/
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** Copyright (C) 2013 Lionel Marty (contact@qxorm.com)
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**
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** This file is part of the QxOrm library
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**
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** This software is provided 'as-is', without any express or implied
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** warranty. In no event will the authors be held liable for any
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** damages arising from the use of this software
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**
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** Commercial Usage
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** Licensees holding valid commercial QxOrm licenses may use this file in
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** accordance with the commercial license agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and Lionel Marty
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**
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** GNU General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU
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** General Public License version 3.0 as published by the Free Software
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** Foundation and appearing in the file 'license.gpl3.txt' included in the
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** packaging of this file. Please review the following information to
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** ensure the GNU General Public License version 3.0 requirements will be
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** met : http://www.gnu.org/copyleft/gpl.html
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**
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** If you are unsure which license is appropriate for your use, or
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** if you have questions regarding the use of this file, please contact :
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** contact@qxorm.com
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**
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****************************************************************************/
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#ifndef _QX_SQL_RELATION_MANY_TO_MANY_H_
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#define _QX_SQL_RELATION_MANY_TO_MANY_H_
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#ifdef _MSC_VER
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#pragma once
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#endif
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/*!
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* \file QxSqlRelation_ManyToMany.h
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* \author Lionel Marty
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* \ingroup QxDao
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* \brief Manage a relationship many-to-many defined between 2 classes (or between 2 tables in database)
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*/
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#include <QxDao/QxSqlRelation.h>
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namespace qx {
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/*!
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* \ingroup QxDao
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* \brief qx::QxSqlRelation_ManyToMany<DataType, Owner> : manage a relationship many-to-many defined between 2 classes (or between 2 tables in database)
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*/
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template <class DataType, class Owner>
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class QxSqlRelation_ManyToMany : public QxSqlRelation<DataType, Owner>
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{
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private:
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typedef typename QxSqlRelation<DataType, Owner>::type_owner type_owner;
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typedef typename QxSqlRelation<DataType, Owner>::type_data type_data;
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typedef typename QxSqlRelation<DataType, Owner>::type_container type_container;
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typedef typename QxSqlRelation<DataType, Owner>::type_generic_container type_generic_container;
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typedef typename QxSqlRelation<DataType, Owner>::type_item type_item;
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typedef typename type_generic_container::type_iterator type_iterator;
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typedef typename type_item::type_value type_value;
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enum { is_data_container = QxSqlRelation<DataType, Owner>::is_data_container };
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public:
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QxSqlRelation_ManyToMany(IxDataMember * p, const QString & sExtraTable, const QString & sForeignKeyOwner, const QString & sForeignKeyDataType) : QxSqlRelation<DataType, Owner>(p) { this->setRelationType(qx::IxSqlRelation::many_to_many); this->setExtraTable(sExtraTable); this->setForeignKeyOwner(sForeignKeyOwner); this->setForeignKeyDataType(sForeignKeyDataType); this->verifyParameters(); }
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virtual ~QxSqlRelation_ManyToMany() { static_assert(is_data_container, "is_data_container"); }
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virtual QString getDescription() const { return "relation many-to-many"; }
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virtual bool getCartesianProduct() const { return true; }
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virtual void createTable(QxSqlRelationParams & params) const { Q_UNUSED(params); }
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virtual void lazySelect(QxSqlRelationParams & params) const { Q_UNUSED(params); }
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virtual void lazyFrom(QxSqlRelationParams & params) const { Q_UNUSED(params); }
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virtual void eagerFrom(QxSqlRelationParams & params) const { Q_UNUSED(params); }
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virtual void lazyJoin(QxSqlRelationParams & params) const { Q_UNUSED(params); }
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virtual void lazyWhere(QxSqlRelationParams & params) const { Q_UNUSED(params); }
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virtual void eagerWhere(QxSqlRelationParams & params) const { Q_UNUSED(params); }
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virtual void lazyWhereSoftDelete(QxSqlRelationParams & params) const { Q_UNUSED(params); }
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virtual void lazyFetch_ResolveInput(QxSqlRelationParams & params) const { Q_UNUSED(params); }
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virtual void eagerFetch_ResolveInput(QxSqlRelationParams & params) const { Q_UNUSED(params); }
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virtual void lazyFetch_ResolveOutput(QxSqlRelationParams & params) const { Q_UNUSED(params); }
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virtual void lazyInsert(QxSqlRelationParams & params) const { Q_UNUSED(params); }
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virtual void lazyInsert_Values(QxSqlRelationParams & params) const { Q_UNUSED(params); }
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virtual void lazyUpdate(QxSqlRelationParams & params) const { Q_UNUSED(params); }
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virtual void lazyInsert_ResolveInput(QxSqlRelationParams & params) const { Q_UNUSED(params); }
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virtual void lazyUpdate_ResolveInput(QxSqlRelationParams & params) const { Q_UNUSED(params); }
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virtual QSqlError onBeforeSave(QxSqlRelationParams & params) const { Q_UNUSED(params); return QSqlError(); }
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virtual QVariant getIdFromQuery(bool bEager, QxSqlRelationParams & params, int iOffset, int iNameIndex) const
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{ return this->getIdFromQuery_ManyToMany(bEager, params, iOffset, iNameIndex); }
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virtual void updateOffset(bool bEager, QxSqlRelationParams & params) const
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{ this->updateOffset_ManyToMany(bEager, params); }
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virtual void eagerSelect(QxSqlRelationParams & params) const
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{ this->eagerSelect_ManyToMany(params); }
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virtual void eagerJoin(QxSqlRelationParams & params) const
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{ this->eagerJoin_ManyToMany(params); }
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virtual void eagerWhereSoftDelete(QxSqlRelationParams & params) const
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{ this->eagerWhereSoftDelete_ManyToMany(params); }
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virtual void * eagerFetch_ResolveOutput(QxSqlRelationParams & params) const
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{
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if (! this->verifyOffset(params, true)) { return NULL; }
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QSqlQuery & query = params.query();
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IxDataMember * p = NULL; IxDataMember * pId = this->getDataId(); qAssert(pId);
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long lIndex = 0; long lOffsetId = ((pId && (! params.isDistinct())) ? pId->getNameCount() : 0); bool bValidId(false);
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long lOffsetOld = params.offset(); this->updateOffset(true, params);
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long lRelation = 0; IxSqlRelation * pRelation = NULL;
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if (! params.isDistinct())
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{
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for (int i = 0; i < pId->getNameCount(); i++)
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{ QVariant v = query.value(lOffsetOld + i); bValidId = (bValidId || qx::trait::is_valid_primary_key(v)); }
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if (! bValidId) { return NULL; }
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}
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type_item item = this->createItem();
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type_data & item_val = item.value_qx();
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if (! this->callTriggerBeforeFetch(item_val, params)) { return NULL; }
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if (! params.isDistinct())
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{
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for (int i = 0; i < pId->getNameCount(); i++)
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{ QVariant v = query.value(lOffsetOld + i); qx::cvt::from_variant(v, item.key(), "", i, qx::cvt::context::e_database); }
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for (int i = 0; i < pId->getNameCount(); i++)
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{ QVariant v = query.value(lOffsetOld + i); pId->fromVariant((& item_val), v, "", i, qx::cvt::context::e_database); }
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}
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else
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{
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for (int i = 0; i < pId->getNameCount(); i++)
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{ QVariant v = this->getIdFromQuery(true, params, (lOffsetOld + i), i); qx::cvt::from_variant(v, item.key(), "", i, qx::cvt::context::e_database); }
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}
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long lOffsetRelation = (lOffsetOld + lOffsetId); long lCurrIndex = 0;
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while ((p = this->nextData(lIndex)))
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{ if (params.checkColumns(p->getKey())) { p->fromVariant((& item_val), query.value(lCurrIndex + lOffsetRelation), -1, qx::cvt::context::e_database); lCurrIndex++; } }
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if (params.relationX())
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{
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long lOffsetCurrent = (lCurrIndex + lOffsetRelation);
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QString sOldCustomAliasOwner = params.getCustomAliasOwner(); params.setCustomAliasOwner(params.getCustomAlias());
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long lIndexOwnerOld = params.indexOwner(); params.setIndexOwner(params.index());
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void * pOwnerOld = params.owner(); params.setOwner(& item_val);
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lOffsetOld = params.offset(); params.setOffset(lOffsetCurrent);
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while ((pRelation = this->nextRelation(lRelation)))
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{ if (this->addLazyRelation(params, pRelation)) { pRelation->lazyFetch_ResolveOutput(params); } }
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params.setOwner(pOwnerOld); params.setOffset(lOffsetOld);
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params.setCustomAliasOwner(sOldCustomAliasOwner);
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params.setIndexOwner(lIndexOwnerOld);
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}
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if (! this->callTriggerAfterFetch(item_val, params)) { return NULL; }
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type_value * pValue = type_generic_container::insertItem(this->getContainer(params), item);
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if (! type_item::is_value_pointer && pValue) { return pValue; }
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return (& item_val);
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}
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virtual QSqlError onAfterSave(QxSqlRelationParams & params) const
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{
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QSqlError daoError;
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if (this->isNullData(params)) { return this->deleteFromExtraTable(params); }
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if (! params.recursiveMode()) { daoError = qx::dao::save(this->getContainer(params), (& params.database())); }
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else { daoError = qx::dao::save_with_relation_recursive(this->getContainer(params), params.saveMode(), (& params.database()), (& params)); }
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if (daoError.isValid()) { return daoError; }
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daoError = this->deleteFromExtraTable(params);
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if (daoError.isValid()) { return daoError; }
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daoError = this->insertIntoExtraTable(params);
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if (daoError.isValid()) { return daoError; }
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return QSqlError();
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}
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virtual QString createExtraTable() const
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{ return this->createExtraTable_ManyToMany(); }
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private:
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void verifyParameters()
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{ qAssert(! this->getExtraTable().isEmpty() && ! this->getForeignKeyOwner().isEmpty() && ! this->getForeignKeyDataType().isEmpty() && (this->getForeignKeyOwner() != this->getForeignKeyDataType())); }
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QSqlError deleteFromExtraTable(QxSqlRelationParams & params) const
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{ return this->deleteFromExtraTable_ManyToMany(params); }
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QSqlError insertIntoExtraTable(QxSqlRelationParams & params) const
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{
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IxDataMember * pIdOwner = this->getDataIdOwner(); qAssert(pIdOwner);
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IxDataMember * pIdData = this->getDataId(); qAssert(pIdData);
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if (! pIdOwner || ! pIdData) { return QSqlError(); }
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QStringList lstForeignKeyOwner = this->getForeignKeyOwner().split("|");
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QStringList lstForeignKeyDataType = this->getForeignKeyDataType().split("|");
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qAssert(pIdOwner->getNameCount() == lstForeignKeyOwner.count());
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qAssert(pIdData->getNameCount() == lstForeignKeyDataType.count());
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QString sql = "INSERT INTO " + this->getExtraTable() + " (";
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sql += pIdOwner->getSqlName(", ", this->getForeignKeyOwner(), false, (& params.builder()));
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sql += ", ";
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sql += pIdData->getSqlName(", ", this->getForeignKeyDataType(), false, (& params.builder()));
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sql += ") VALUES (";
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sql += pIdOwner->getSqlPlaceHolder("", -1, ", ", this->getForeignKeyOwner()) + ", " + pIdData->getSqlPlaceHolder("", -1, ", ", this->getForeignKeyDataType()) + ")";
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if (this->traceSqlQuery()) { qDebug("[QxOrm] sql query (extra-table) : %s", qPrintable(sql)); }
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type_item item;
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type_container & container = this->getContainer(params);
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type_iterator itr = type_generic_container::begin(container, item);
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type_iterator itr_end = type_generic_container::end(container);
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QSqlQuery queryInsert(params.database());
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if (! queryInsert.prepare(sql)) { return queryInsert.lastError(); }
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while (itr != itr_end)
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{
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pIdOwner->setSqlPlaceHolder(queryInsert, params.owner(), "", this->getForeignKeyOwner());
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pIdData->setSqlPlaceHolder(queryInsert, (& item.value_qx()), "", this->getForeignKeyDataType());
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if (! queryInsert.exec()) { return queryInsert.lastError(); }
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itr = type_generic_container::next(container, itr, item);
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}
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return QSqlError();
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}
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};
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} // namespace qx
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#endif // _QX_SQL_RELATION_MANY_TO_MANY_H_
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