QxOrm 1.1.6
C++ Object Relational Mapping library
QxSqlRelation_OneToMany.h
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00003 ** http://www.qxorm.com/
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00005 ** Original file by Lionel Marty
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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 bool getCartesianProduct() const                                   { return true; }
00072    virtual void createTable(QxSqlRelationParams & params) const               { Q_UNUSED(params); }
00073    virtual void lazySelect(QxSqlRelationParams & params) const                { Q_UNUSED(params); }
00074    virtual void lazyFrom(QxSqlRelationParams & params) const                  { Q_UNUSED(params); }
00075    virtual void eagerFrom(QxSqlRelationParams & params) const                 { Q_UNUSED(params); }
00076    virtual void lazyJoin(QxSqlRelationParams & params) const                  { Q_UNUSED(params); }
00077    virtual void lazyWhere(QxSqlRelationParams & params) const                 { Q_UNUSED(params); }
00078    virtual void eagerWhere(QxSqlRelationParams & params) const                { Q_UNUSED(params); }
00079    virtual void lazyFetch_ResolveInput(QxSqlRelationParams & params) const    { Q_UNUSED(params); }
00080    virtual void eagerFetch_ResolveInput(QxSqlRelationParams & params) const   { Q_UNUSED(params); }
00081    virtual void lazyFetch_ResolveOutput(QxSqlRelationParams & params) const   { Q_UNUSED(params); }
00082    virtual void lazyInsert(QxSqlRelationParams & params) const                { Q_UNUSED(params); }
00083    virtual void lazyInsert_Values(QxSqlRelationParams & params) const         { Q_UNUSED(params); }
00084    virtual void lazyUpdate(QxSqlRelationParams & params) const                { Q_UNUSED(params); }
00085    virtual void lazyInsert_ResolveInput(QxSqlRelationParams & params) const   { Q_UNUSED(params); }
00086    virtual void lazyUpdate_ResolveInput(QxSqlRelationParams & params) const   { Q_UNUSED(params); }
00087    virtual QSqlError onBeforeSave(QxSqlRelationParams & params) const         { Q_UNUSED(params); return QSqlError(); }
00088    virtual QSqlError createExtraTable(QxSqlRelationParams & params) const     { Q_UNUSED(params); return QSqlError(); }
00089 
00090    virtual QSqlError onAfterSave(QxSqlRelationParams & params) const
00091    { return qx::dao::save(this->getContainer(params), (& params.database())); }
00092 
00093    virtual QVariant getIdFromQuery(bool bEager, QxSqlRelationParams & params) const
00094    {
00095       QString sId; IxDataMember * pId = this->getDataId(); if (! bEager || ! pId) { return QVariant(); }
00096       for (int i = 0; i < pId->getNameCount(); i++) { sId += params.query().value(params.offset() + i).toString() + "|"; }
00097       return QVariant(sId);
00098    }
00099 
00100    virtual void updateOffset(bool bEager, QxSqlRelationParams & params) const
00101    {
00102       if (! bEager) { return; }
00103       IxDataMember * pForeign = this->getDataByKey(m_sForeignKey);
00104       bool bAddOffsetForeign = (pForeign && ! this->getLstDataMember()->exist(m_sForeignKey));
00105       long lOffsetId = (this->getDataId() ? this->getDataId()->getNameCount() : 0);
00106       long lNewOffset = (params.offset() + this->getDataCount() + lOffsetId);
00107       lNewOffset = (lNewOffset + (bAddOffsetForeign ? pForeign->getNameCount() : 0));
00108       params.setOffset(lNewOffset);
00109    }
00110 
00111    virtual void eagerSelect(QxSqlRelationParams & params) const
00112    {
00113       long l1(0);
00114       QString & sql = params.sql();
00115       IxDataMember * pForeign = this->getDataByKey(m_sForeignKey); qAssert(pForeign);
00116       IxDataMember * p = NULL; IxDataMember * pId = this->getDataId(); qAssert(pId);
00117       QString tableAlias = this->tableAlias(params);
00118       if (pId) { sql += (pId->getSqlTablePointNameAsAlias(tableAlias) + ", "); }
00119       if (pForeign) { sql += (pForeign->getSqlTablePointNameAsAlias(tableAlias) + ", "); }
00120       while ((p = this->nextData(l1))) { if (p != pForeign) { sql += (p->getSqlTablePointNameAsAlias(tableAlias) + ", "); } }
00121    }
00122 
00123    virtual void eagerJoin(QxSqlRelationParams & params) const
00124    {
00125       QString & sql = params.sql();
00126       IxDataMember * pId = params.builder().getDataId(); qAssert(pId);
00127       IxDataMember * pForeign = this->getDataByKey(m_sForeignKey); qAssert(pForeign);
00128       QString table = this->table(); QString tableAlias = this->tableAlias(params); QString tableRef = params.builder().table();
00129       if (! pId || ! pForeign) { return; }
00130       sql += this->getSqlJoin() + table + " " + tableAlias + " ON ";
00131       for (int i = 0; i < pId->getNameCount(); i++)
00132       { sql += pForeign->getSqlAlias(tableAlias, true, i) + " = " + pId->getSqlAlias(tableRef, true, i) + " AND "; }
00133       sql = sql.left(sql.count() - 5); // Remove last " AND "
00134    }
00135 
00136    virtual void eagerFetch_ResolveOutput(QxSqlRelationParams & params) const
00137    {
00138       if (! this->verifyOffset(params, true)) { return; }
00139       QSqlQuery & query = params.query();
00140       IxDataMember * p = NULL; IxDataMember * pId = this->getDataId(); qAssert(pId); if (! pId) { return; }
00141       IxDataMember * pForeign = this->getDataByKey(m_sForeignKey); qAssert(pForeign); if (! pForeign) { return; }
00142       long lIndex = 0; long lOffsetId = (pId ? pId->getNameCount() : 0); long lOffsetForeign = (pForeign ? pForeign->getNameCount() : 0);
00143       long lOffsetOld = params.offset(); this->updateOffset(true, params);
00144       long lOffsetRelation = (lOffsetOld + lOffsetId + lOffsetForeign);
00145       bool bValidId(false), bValidForeign(false);
00146       for (int i = 0; i < pId->getNameCount(); i++)
00147       { QVariant vId = query.value(lOffsetOld + i); bValidId = (bValidId || qx::trait::is_valid_primary_key(vId)); }
00148       for (int i = 0; i < pForeign->getNameCount(); i++)
00149       { QVariant vForeign = query.value(lOffsetOld + lOffsetId + i); bValidForeign = (bValidForeign || qx::trait::is_valid_primary_key(vForeign)); }
00150       if (! bValidId || ! bValidForeign) { return; }
00151       type_item item = this->createItem();
00152       type_data & item_val = item.value_qx();
00153       for (int i = 0; i < pId->getNameCount(); i++)
00154       { QVariant v = query.value(lOffsetOld + i); qx::cvt::from_variant(v, item.key(), "", i); }
00155       for (int i = 0; i < pId->getNameCount(); i++)
00156       { QVariant v = query.value(lOffsetOld + i); pId->fromVariant((& item_val), v, "", i); }
00157       for (int i = 0; i < pForeign->getNameCount(); i++)
00158       { QVariant v = query.value(lOffsetOld + lOffsetId + i); pForeign->fromVariant((& item_val), v, "", i); }
00159       while ((p = this->nextData(lIndex)))
00160       { if (p != pForeign) { p->fromVariant((& item_val), query.value(lOffsetRelation++)); } }
00161       type_generic_container::insertItem(this->getContainer(params), item);
00162    }
00163 
00164 };
00165 
00166 } // namespace qx
00167 
00168 #endif // _QX_SQL_RELATION_ONE_TO_MANY_H_
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