QxOrm 1.1.8
C++ Object Relational Mapping library
QxSqlRelation_ManyToMany.h
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00003 ** http://www.qxorm.com/
00004 ** http://sourceforge.net/projects/qxorm/
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00025 
00026 #ifndef _QX_SQL_RELATION_MANY_TO_MANY_H_
00027 #define _QX_SQL_RELATION_MANY_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_ManyToMany : 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    typedef typename type_generic_container::type_iterator type_iterator;
00060 
00061    enum { is_data_container = QxSqlRelation<DataType, Owner>::is_data_container };
00062 
00063 protected:
00064 
00065    QString m_sExtraTable;           
00066    QString m_sForeignKeyOwner;      
00067    QString m_sForeignKeyDataType;   
00068 
00069 public:
00070 
00071    QxSqlRelation_ManyToMany(IxDataMember * p, const QString & sExtraTable, const QString & sForeignKeyOwner, const QString & sForeignKeyDataType) : QxSqlRelation<DataType, Owner>(p), m_sExtraTable(sExtraTable), m_sForeignKeyOwner(sForeignKeyOwner), m_sForeignKeyDataType(sForeignKeyDataType) { this->verifyParameters(); }
00072    virtual ~QxSqlRelation_ManyToMany() { BOOST_STATIC_ASSERT(is_data_container); }
00073 
00074    virtual bool getCartesianProduct() const                                   { return true; }
00075    virtual void createTable(QxSqlRelationParams & params) const               { Q_UNUSED(params); }
00076    virtual void lazySelect(QxSqlRelationParams & params) const                { Q_UNUSED(params); }
00077    virtual void lazyFrom(QxSqlRelationParams & params) const                  { Q_UNUSED(params); }
00078    virtual void eagerFrom(QxSqlRelationParams & params) const                 { Q_UNUSED(params); }
00079    virtual void lazyJoin(QxSqlRelationParams & params) const                  { Q_UNUSED(params); }
00080    virtual void lazyWhere(QxSqlRelationParams & params) const                 { Q_UNUSED(params); }
00081    virtual void eagerWhere(QxSqlRelationParams & params) const                { Q_UNUSED(params); }
00082    virtual void lazyWhereSoftDelete(QxSqlRelationParams & params) const       { Q_UNUSED(params); }
00083    virtual void lazyFetch_ResolveInput(QxSqlRelationParams & params) const    { Q_UNUSED(params); }
00084    virtual void eagerFetch_ResolveInput(QxSqlRelationParams & params) const   { Q_UNUSED(params); }
00085    virtual void lazyFetch_ResolveOutput(QxSqlRelationParams & params) const   { Q_UNUSED(params); }
00086    virtual void lazyInsert(QxSqlRelationParams & params) const                { Q_UNUSED(params); }
00087    virtual void lazyInsert_Values(QxSqlRelationParams & params) const         { Q_UNUSED(params); }
00088    virtual void lazyUpdate(QxSqlRelationParams & params) const                { Q_UNUSED(params); }
00089    virtual void lazyInsert_ResolveInput(QxSqlRelationParams & params) const   { Q_UNUSED(params); }
00090    virtual void lazyUpdate_ResolveInput(QxSqlRelationParams & params) const   { Q_UNUSED(params); }
00091    virtual QSqlError onBeforeSave(QxSqlRelationParams & params) const         { Q_UNUSED(params); return QSqlError(); }
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       long lOffsetNew = params.offset() + this->getDataCount();
00104       lOffsetNew += (this->getDataId() ? this->getDataId()->getNameCount() : 0);
00105       lOffsetNew += (this->m_oSoftDelete.isEmpty() ? 0 : 1);
00106       params.setOffset(lOffsetNew);
00107    }
00108 
00109    virtual void eagerSelect(QxSqlRelationParams & params) const
00110    {
00111       long l1(0);
00112       QString & sql = params.sql();
00113       IxDataMember * p = NULL; IxDataMember * pId = this->getDataId(); qAssert(pId);
00114       QString tableAlias = this->tableAlias(params);
00115       if (pId) { sql += (pId->getSqlTablePointNameAsAlias(tableAlias) + ", "); }
00116       while ((p = this->nextData(l1))) { sql += (p->getSqlTablePointNameAsAlias(tableAlias) + ", "); }
00117       if (! this->m_oSoftDelete.isEmpty()) { sql += (this->m_oSoftDelete.buildSqlTablePointName(tableAlias) + ", "); }
00118    }
00119 
00120    virtual void eagerJoin(QxSqlRelationParams & params) const
00121    {
00122       QString & sql = params.sql();
00123       IxDataMember * pIdOwner = params.builder().getDataId(); qAssert(pIdOwner);
00124       IxDataMember * pIdData = this->getDataId(); qAssert(pIdData);
00125       QString table = this->table(); QString tableAlias = this->tableAlias(params); QString tableOwner = params.builder().table();
00126       if (! pIdOwner || ! pIdData) { return; }
00127       QStringList lstForeignKeyOwner = m_sForeignKeyOwner.split("|");
00128       QStringList lstForeignKeyDataType = m_sForeignKeyDataType.split("|");
00129       qAssert(pIdOwner->getNameCount() == lstForeignKeyOwner.count());
00130       qAssert(pIdData->getNameCount() == lstForeignKeyDataType.count());
00131       sql += this->getSqlJoin() + m_sExtraTable + " ON ";
00132       for (int i = 0; i < pIdOwner->getNameCount(); i++)
00133       { sql += pIdOwner->getSqlAlias(tableOwner, true, i) + " = " + m_sExtraTable + "." + lstForeignKeyOwner.at(i) + " AND "; }
00134       sql = sql.left(sql.count() - 5); // Remove last " AND "
00135       sql += this->getSqlJoin() + table + " " + tableAlias + " ON ";
00136       for (int i = 0; i < pIdData->getNameCount(); i++)
00137       { sql += m_sExtraTable + "." + lstForeignKeyDataType.at(i) + " = " + pIdData->getSqlAlias(tableAlias, true, i) + " AND "; }
00138       sql = sql.left(sql.count() - 5); // Remove last " AND "
00139    }
00140 
00141    virtual void eagerWhereSoftDelete(QxSqlRelationParams & params) const
00142    {
00143       if (this->m_oSoftDelete.isEmpty()) { return; }
00144       QString & sql = params.sql();
00145       QString tableAlias = this->tableAlias(params);
00146       sql += qx::IxSqlQueryBuilder::addSqlCondition(sql);
00147       sql += this->m_oSoftDelete.buildSqlQueryToFetch(tableAlias);
00148    }
00149 
00150    virtual void eagerFetch_ResolveOutput(QxSqlRelationParams & params) const
00151    {
00152       if (! this->verifyOffset(params, true)) { return; }
00153       QSqlQuery & query = params.query();
00154       IxDataMember * p = NULL; IxDataMember * pId = this->getDataId(); qAssert(pId);
00155       long lIndex = 0; long lOffsetId = (pId ? pId->getNameCount() : 0); bool bValidId(false);
00156       long lOffsetOld = params.offset(); this->updateOffset(true, params);
00157       for (int i = 0; i < pId->getNameCount(); i++)
00158       { QVariant v = query.value(lOffsetOld + i); bValidId = (bValidId || qx::trait::is_valid_primary_key(v)); }
00159       if (! bValidId) { return; }
00160       type_item item = this->createItem();
00161       type_data & item_val = item.value_qx();
00162       for (int i = 0; i < pId->getNameCount(); i++)
00163       { QVariant v = query.value(lOffsetOld + i); qx::cvt::from_variant(v, item.key(), "", i); }
00164       for (int i = 0; i < pId->getNameCount(); i++)
00165       { QVariant v = query.value(lOffsetOld + i); pId->fromVariant((& item_val), v, "", i); }
00166       while ((p = this->nextData(lIndex)))
00167       { p->fromVariant((& item_val), query.value(lIndex + lOffsetOld + lOffsetId - 1)); }
00168       type_generic_container::insertItem(this->getContainer(params), item);
00169    }
00170 
00171    virtual QSqlError onAfterSave(QxSqlRelationParams & params) const
00172    {
00173       QSqlError daoError = qx::dao::save(this->getContainer(params), (& params.database()));
00174       if (daoError.isValid()) { return daoError; }
00175       daoError = this->deleteFromExtraTable(params);
00176       if (daoError.isValid()) { return daoError; }
00177       daoError = this->insertIntoExtraTable(params);
00178       if (daoError.isValid()) { return daoError; }
00179       return QSqlError();
00180    }
00181 
00182    virtual QSqlError createExtraTable(QxSqlRelationParams & params) const
00183    {
00184       IxDataMember * pIdOwner = params.builder().getDataId(); qAssert(pIdOwner);
00185       IxDataMember * pIdData = this->getDataId(); qAssert(pIdData);
00186       if (! pIdOwner || ! pIdData) { return QSqlError(); }
00187 
00188       bool bOldPKOwner = pIdOwner->getIsPrimaryKey(); pIdOwner->setIsPrimaryKey(false);
00189       bool bOldPKData = pIdData->getIsPrimaryKey(); pIdData->setIsPrimaryKey(false);
00190       bool bOldAIOwner = pIdOwner->getAutoIncrement(); pIdOwner->setAutoIncrement(false);
00191       bool bOldAIData = pIdData->getAutoIncrement(); pIdData->setAutoIncrement(false);
00192 
00193       QString sql = "CREATE TABLE IF NOT EXISTS " + m_sExtraTable + " (";
00194       sql += pIdOwner->getSqlNameAndTypeAndParams(", ", m_sForeignKeyOwner) + ", "; qAssert(! pIdOwner->getSqlType().isEmpty());
00195       sql += pIdData->getSqlNameAndTypeAndParams(", ", m_sForeignKeyDataType) + ", "; qAssert(! pIdData->getSqlType().isEmpty());
00196       sql = sql.left(sql.count() - 2); // Remove last ", "
00197       sql += ")";
00198 
00199       pIdOwner->setIsPrimaryKey(bOldPKOwner); pIdData->setIsPrimaryKey(bOldPKData);
00200       pIdOwner->setAutoIncrement(bOldAIOwner); pIdData->setAutoIncrement(bOldAIData);
00201       qDebug("[QxOrm] create extra-table (relation many-to-many) : %s", qPrintable(sql));
00202       QSqlQuery queryCreateTable(params.database());
00203       if (! queryCreateTable.exec(sql)) { return queryCreateTable.lastError(); }
00204       return QSqlError();
00205    }
00206 
00207 private:
00208 
00209    inline void verifyParameters()
00210    { qAssert(! m_sExtraTable.isEmpty() && ! m_sForeignKeyOwner.isEmpty() && ! m_sForeignKeyDataType.isEmpty() && (m_sForeignKeyOwner != m_sForeignKeyDataType)); }
00211 
00212    QSqlError deleteFromExtraTable(QxSqlRelationParams & params) const
00213    {
00214       IxDataMember * pIdOwner = params.builder().getDataId(); qAssert(pIdOwner);
00215       QString sql = "DELETE FROM " + m_sExtraTable + " WHERE ";
00216       QStringList lstForeignKeyOwner = m_sForeignKeyOwner.split("|");
00217       qAssert(pIdOwner->getNameCount() == lstForeignKeyOwner.count());
00218       for (int i = 0; i < pIdOwner->getNameCount(); i++)
00219       { sql += m_sExtraTable + "." + lstForeignKeyOwner.at(i) + " = " + pIdOwner->getSqlPlaceHolder("", i) + " AND "; }
00220       sql = sql.left(sql.count() - 5); // Remove last " AND "
00221       qDebug("[QxOrm] sql query (extra-table) : %s", qPrintable(sql));
00222 
00223       QSqlQuery queryDelete(params.database());
00224       queryDelete.prepare(sql);
00225       pIdOwner->setSqlPlaceHolder(queryDelete, params.owner());
00226       if (! queryDelete.exec()) { return queryDelete.lastError(); }
00227       return QSqlError();
00228    }
00229 
00230    QSqlError insertIntoExtraTable(QxSqlRelationParams & params) const
00231    {
00232       IxDataMember * pIdOwner = params.builder().getDataId(); qAssert(pIdOwner);
00233       IxDataMember * pIdData = this->getDataId(); qAssert(pIdData);
00234       if (! pIdOwner || ! pIdData) { return QSqlError(); }
00235       QStringList lstForeignKeyOwner = m_sForeignKeyOwner.split("|");
00236       QStringList lstForeignKeyDataType = m_sForeignKeyDataType.split("|");
00237       qAssert(pIdOwner->getNameCount() == lstForeignKeyOwner.count());
00238       qAssert(pIdData->getNameCount() == lstForeignKeyDataType.count());
00239 
00240       QString sql = "INSERT INTO " + m_sExtraTable + " (";
00241       sql += pIdOwner->getSqlName(", ", m_sForeignKeyOwner) + ", " + pIdData->getSqlName(", ", m_sForeignKeyDataType);
00242       sql += ") VALUES (";
00243       sql += pIdOwner->getSqlPlaceHolder("", -1, ", ", m_sForeignKeyOwner) + ", " + pIdData->getSqlPlaceHolder("", -1, ", ", m_sForeignKeyDataType) + ")";
00244       qDebug("[QxOrm] sql query (extra-table) : %s", qPrintable(sql));
00245 
00246       type_item item;
00247       type_container container = this->getContainer(params);
00248       type_iterator itr = type_generic_container::begin(container, item);
00249       type_iterator itr_end = type_generic_container::end(container);
00250       QSqlQuery queryInsert(params.database());
00251       queryInsert.prepare(sql);
00252 
00253       while (itr != itr_end)
00254       {
00255          pIdOwner->setSqlPlaceHolder(queryInsert, params.owner(), "", m_sForeignKeyOwner);
00256          pIdData->setSqlPlaceHolder(queryInsert, (& item.value_qx()), "", m_sForeignKeyDataType);
00257          if (! queryInsert.exec()) { return queryInsert.lastError(); }
00258          itr = type_generic_container::next(container, itr, item);
00259       }
00260 
00261       return QSqlError();
00262    }
00263 
00264 };
00265 
00266 } // namespace qx
00267 
00268 #endif // _QX_SQL_RELATION_MANY_TO_MANY_H_
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