QxOrm 1.1.9
C++ Object Relational Mapping library
QxSqlRelation_OneToMany.h
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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
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00013 ** GNU Lesser General Public License Usage
00014 ** This file must be used under the terms of the GNU Lesser
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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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