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QxSqlRelation_OneToMany.h
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    00001 /****************************************************************************
    00002 **
    00003 ** http://www.qxorm.com/
    00004 ** http://sourceforge.net/projects/qxorm/
    00005 ** Original file by Lionel Marty
    00006 **
    00007 ** This file is part of the QxOrm library
    00008 **
    00009 ** This software is provided 'as-is', without any express or implied
    00010 ** warranty. In no event will the authors be held liable for any
    00011 ** damages arising from the use of this software.
    00012 **
    00013 ** GNU Lesser General Public License Usage
    00014 ** This file must be used under the terms of the GNU Lesser
    00015 ** General Public License version 2.1 as published by the Free Software
    00016 ** Foundation and appearing in the file 'license.lgpl.txt' included in the
    00017 ** packaging of this file.  Please review the following information to
    00018 ** ensure the GNU Lesser General Public License version 2.1 requirements
    00019 ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
    00020 **
    00021 ** If you have questions regarding the use of this file, please contact :
    00022 ** contact@qxorm.com
    00023 **
    00024 ****************************************************************************/
    00025
    00026 #ifndef _QX_SQL_RELATION_ONE_TO_MANY_H_
    00027 #define _QX_SQL_RELATION_ONE_TO_MANY_H_
    00028
    00029 #ifdef _MSC_VER
    00030 #pragma once
    00031 #endif
    00032
    00040 #include <QxDao/QxSqlRelation.h>
    00041
    00042 namespace qx {
    00043
    00048 template <class DataType, class Owner>
    00049 class QxSqlRelation_OneToMany : public QxSqlRelation<DataType, Owner>
    00050 {
    00051
    00052 private:
    00053
    00054    typedef typename QxSqlRelation<DataType, Owner>::type_owner type_owner;
    00055    typedef typename QxSqlRelation<DataType, Owner>::type_data type_data;
    00056    typedef typename QxSqlRelation<DataType, Owner>::type_container type_container;
    00057    typedef typename QxSqlRelation<DataType, Owner>::type_generic_container type_generic_container;
    00058    typedef typename QxSqlRelation<DataType, Owner>::type_item type_item;
    00059
    00060    enum { is_data_container = QxSqlRelation<DataType, Owner>::is_data_container };
    00061
    00062 protected:
    00063
    00064    QString m_sForeignKey;
    00065
    00066 public:
    00067
    00068    QxSqlRelation_OneToMany(IxDataMember * p, const QString & sForeignKey) : QxSqlRelation<DataType, Owner>(p), m_sForeignKey(sForeignKey) { qAssert(! m_sForeignKey.isEmpty()); }
    00069    virtual ~QxSqlRelation_OneToMany() { BOOST_STATIC_ASSERT(is_data_container); }
    00070
    00071    virtual QString getDescription() const                                     { return "relation one-to-many"; }
    00072    virtual bool getCartesianProduct() const                                   { return true; }
    00073    virtual void createTable(QxSqlRelationParams & params) const               { Q_UNUSED(params); }
    00074    virtual void lazySelect(QxSqlRelationParams & params) const                { Q_UNUSED(params); }
    00075    virtual void lazyFrom(QxSqlRelationParams & params) const                  { Q_UNUSED(params); }
    00076    virtual void eagerFrom(QxSqlRelationParams & params) const                 { Q_UNUSED(params); }
    00077    virtual void lazyJoin(QxSqlRelationParams & params) const                  { Q_UNUSED(params); }
    00078    virtual void lazyWhere(QxSqlRelationParams & params) const                 { Q_UNUSED(params); }
    00079    virtual void eagerWhere(QxSqlRelationParams & params) const                { Q_UNUSED(params); }
    00080    virtual void lazyWhereSoftDelete(QxSqlRelationParams & params) const       { Q_UNUSED(params); }
    00081    virtual void lazyFetch_ResolveInput(QxSqlRelationParams & params) const    { Q_UNUSED(params); }
    00082    virtual void eagerFetch_ResolveInput(QxSqlRelationParams & params) const   { Q_UNUSED(params); }
    00083    virtual void lazyFetch_ResolveOutput(QxSqlRelationParams & params) const   { Q_UNUSED(params); }
    00084    virtual void lazyInsert(QxSqlRelationParams & params) const                { Q_UNUSED(params); }
    00085    virtual void lazyInsert_Values(QxSqlRelationParams & params) const         { Q_UNUSED(params); }
    00086    virtual void lazyUpdate(QxSqlRelationParams & params) const                { Q_UNUSED(params); }
    00087    virtual void lazyInsert_ResolveInput(QxSqlRelationParams & params) const   { Q_UNUSED(params); }
    00088    virtual void lazyUpdate_ResolveInput(QxSqlRelationParams & params) const   { Q_UNUSED(params); }
    00089    virtual QSqlError onBeforeSave(QxSqlRelationParams & params) const         { Q_UNUSED(params); return QSqlError(); }
    00090    virtual QSqlError createExtraTable(QxSqlRelationParams & params) const     { Q_UNUSED(params); return QSqlError(); }
    00091
    00092    virtual QSqlError onAfterSave(QxSqlRelationParams & params) const
    00093    { return qx::dao::save(this->getContainer(params), (& params.database())); }
    00094
    00095    virtual QVariant getIdFromQuery(bool bEager, QxSqlRelationParams & params) const
    00096    {
    00097       QString sId; IxDataMember * pId = this->getDataId(); if (! bEager || ! pId) { return QVariant(); }
    00098       for (int i = 0; i < pId->getNameCount(); i++) { sId += params.query().value(params.offset() + i).toString() + "|"; }
    00099       return QVariant(sId);
    00100    }
    00101
    00102    virtual void updateOffset(bool bEager, QxSqlRelationParams & params) const
    00103    {
    00104       if (! bEager) { return; }
    00105       IxDataMember * pForeign = this->getDataByKey(m_sForeignKey);
    00106       bool bAddOffsetForeign = (pForeign && ! this->getLstDataMember()->exist(m_sForeignKey));
    00107       long lOffsetId = (this->getDataId() ? this->getDataId()->getNameCount() : 0);
    00108       long lNewOffset = (params.offset() + this->getDataCount() + lOffsetId);
    00109       lNewOffset = (lNewOffset + (bAddOffsetForeign ? pForeign->getNameCount() : 0));
    00110       lNewOffset = (lNewOffset + (this->m_oSoftDelete.isEmpty() ? 0 : 1));
    00111       params.setOffset(lNewOffset);
    00112    }
    00113
    00114    virtual void eagerSelect(QxSqlRelationParams & params) const
    00115    {
    00116       long l1(0);
    00117       QString & sql = params.sql();
    00118       IxDataMember * pForeign = this->getDataByKey(m_sForeignKey); qAssert(pForeign);
    00119       IxDataMember * p = NULL; IxDataMember * pId = this->getDataId(); qAssert(pId);
    00120       QString tableAlias = this->tableAlias(params);
    00121       if (pId) { sql += (pId->getSqlTablePointNameAsAlias(tableAlias) + ", "); }
    00122       if (pForeign) { sql += (pForeign->getSqlTablePointNameAsAlias(tableAlias) + ", "); }
    00123       while ((p = this->nextData(l1))) { if (p != pForeign) { sql += (p->getSqlTablePointNameAsAlias(tableAlias) + ", "); } }
    00124       if (! this->m_oSoftDelete.isEmpty()) { sql += (this->m_oSoftDelete.buildSqlTablePointName(tableAlias) + ", "); }
    00125    }
    00126
    00127    virtual void eagerJoin(QxSqlRelationParams & params) const
    00128    {
    00129       QString & sql = params.sql();
    00130       IxDataMember * pId = params.builder().getDataId(); qAssert(pId);
    00131       IxDataMember * pForeign = this->getDataByKey(m_sForeignKey); qAssert(pForeign);
    00132       QString table = this->table(); QString tableAlias = this->tableAlias(params); QString tableRef = params.builder().table();
    00133       if (! pId || ! pForeign) { return; }
    00134       sql += this->getSqlJoin() + table + " " + tableAlias + " ON ";
    00135       for (int i = 0; i < pId->getNameCount(); i++)
    00136       { sql += pForeign->getSqlAlias(tableAlias, true, i) + " = " + pId->getSqlAlias(tableRef, true, i) + " AND "; }
    00137       sql = sql.left(sql.count() - 5); // Remove last " AND "
    00138    }
    00139
    00140    virtual void eagerWhereSoftDelete(QxSqlRelationParams & params) const
    00141    {
    00142       if (this->m_oSoftDelete.isEmpty()) { return; }
    00143       QString & sql = params.sql();
    00144       QString tableAlias = this->tableAlias(params);
    00145       sql += qx::IxSqlQueryBuilder::addSqlCondition(sql);
    00146       sql += this->m_oSoftDelete.buildSqlQueryToFetch(tableAlias);
    00147    }
    00148
    00149    virtual void eagerFetch_ResolveOutput(QxSqlRelationParams & params) const
    00150    {
    00151       if (! this->verifyOffset(params, true)) { return; }
    00152       QSqlQuery & query = params.query();
    00153       IxDataMember * p = NULL; IxDataMember * pId = this->getDataId(); qAssert(pId); if (! pId) { return; }
    00154       IxDataMember * pForeign = this->getDataByKey(m_sForeignKey); qAssert(pForeign); if (! pForeign) { return; }
    00155       long lIndex = 0; long lOffsetId = (pId ? pId->getNameCount() : 0); long lOffsetForeign = (pForeign ? pForeign->getNameCount() : 0);
    00156       long lOffsetOld = params.offset(); this->updateOffset(true, params);
    00157       long lOffsetRelation = (lOffsetOld + lOffsetId + lOffsetForeign);
    00158       bool bValidId(false), bValidForeign(false);
    00159       for (int i = 0; i < pId->getNameCount(); i++)
    00160       { QVariant vId = query.value(lOffsetOld + i); bValidId = (bValidId || qx::trait::is_valid_primary_key(vId)); }
    00161       for (int i = 0; i < pForeign->getNameCount(); i++)
    00162       { QVariant vForeign = query.value(lOffsetOld + lOffsetId + i); bValidForeign = (bValidForeign || qx::trait::is_valid_primary_key(vForeign)); }
    00163       if (! bValidId || ! bValidForeign) { return; }
    00164       type_item item = this->createItem();
    00165       type_data & item_val = item.value_qx();
    00166       for (int i = 0; i < pId->getNameCount(); i++)
    00167       { QVariant v = query.value(lOffsetOld + i); qx::cvt::from_variant(v, item.key(), "", i); }
    00168       for (int i = 0; i < pId->getNameCount(); i++)
    00169       { QVariant v = query.value(lOffsetOld + i); pId->fromVariant((& item_val), v, "", i); }
    00170       for (int i = 0; i < pForeign->getNameCount(); i++)
    00171       { QVariant v = query.value(lOffsetOld + lOffsetId + i); pForeign->fromVariant((& item_val), v, "", i); }
    00172       while ((p = this->nextData(lIndex)))
    00173       { if (p != pForeign) { p->fromVariant((& item_val), query.value(lOffsetRelation++)); } }
    00174       type_generic_container::insertItem(this->getContainer(params), item);
    00175    }
    00176
    00177 };
    00178
    00179 } // namespace qx
    00180
    00181 #endif // _QX_SQL_RELATION_ONE_TO_MANY_H_

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