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QxSqlRelation_ManyToMany.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_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 QString getDescription() const                                     { return "relation many-to-many"; }
    00075    virtual QString getExtraTable() const                                      { return m_sExtraTable; }
    00076    virtual bool getCartesianProduct() const                                   { return true; }
    00077    virtual void createTable(QxSqlRelationParams & params) const               { Q_UNUSED(params); }
    00078    virtual void lazySelect(QxSqlRelationParams & params) const                { Q_UNUSED(params); }
    00079    virtual void lazyFrom(QxSqlRelationParams & params) const                  { Q_UNUSED(params); }
    00080    virtual void eagerFrom(QxSqlRelationParams & params) const                 { Q_UNUSED(params); }
    00081    virtual void lazyJoin(QxSqlRelationParams & params) const                  { Q_UNUSED(params); }
    00082    virtual void lazyWhere(QxSqlRelationParams & params) const                 { Q_UNUSED(params); }
    00083    virtual void eagerWhere(QxSqlRelationParams & params) const                { Q_UNUSED(params); }
    00084    virtual void lazyWhereSoftDelete(QxSqlRelationParams & params) const       { Q_UNUSED(params); }
    00085    virtual void lazyFetch_ResolveInput(QxSqlRelationParams & params) const    { Q_UNUSED(params); }
    00086    virtual void eagerFetch_ResolveInput(QxSqlRelationParams & params) const   { Q_UNUSED(params); }
    00087    virtual void lazyFetch_ResolveOutput(QxSqlRelationParams & params) const   { Q_UNUSED(params); }
    00088    virtual void lazyInsert(QxSqlRelationParams & params) const                { Q_UNUSED(params); }
    00089    virtual void lazyInsert_Values(QxSqlRelationParams & params) const         { Q_UNUSED(params); }
    00090    virtual void lazyUpdate(QxSqlRelationParams & params) const                { Q_UNUSED(params); }
    00091    virtual void lazyInsert_ResolveInput(QxSqlRelationParams & params) const   { Q_UNUSED(params); }
    00092    virtual void lazyUpdate_ResolveInput(QxSqlRelationParams & params) const   { Q_UNUSED(params); }
    00093    virtual QSqlError onBeforeSave(QxSqlRelationParams & params) const         { Q_UNUSED(params); return QSqlError(); }
    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       long lOffsetNew = params.offset() + this->getDataCount();
    00106       lOffsetNew += (this->getDataId() ? this->getDataId()->getNameCount() : 0);
    00107       lOffsetNew += (this->m_oSoftDelete.isEmpty() ? 0 : 1);
    00108       params.setOffset(lOffsetNew);
    00109    }
    00110
    00111    virtual void eagerSelect(QxSqlRelationParams & params) const
    00112    {
    00113       long l1(0);
    00114       QString & sql = params.sql();
    00115       IxDataMember * p = NULL; IxDataMember * pId = this->getDataId(); qAssert(pId);
    00116       QString tableAlias = this->tableAlias(params);
    00117       if (pId) { sql += (pId->getSqlTablePointNameAsAlias(tableAlias) + ", "); }
    00118       while ((p = this->nextData(l1))) { sql += (p->getSqlTablePointNameAsAlias(tableAlias) + ", "); }
    00119       if (! this->m_oSoftDelete.isEmpty()) { sql += (this->m_oSoftDelete.buildSqlTablePointName(tableAlias) + ", "); }
    00120    }
    00121
    00122    virtual void eagerJoin(QxSqlRelationParams & params) const
    00123    {
    00124       QString & sql = params.sql();
    00125       IxDataMember * pIdOwner = params.builder().getDataId(); qAssert(pIdOwner);
    00126       IxDataMember * pIdData = this->getDataId(); qAssert(pIdData);
    00127       QString table = this->table(); QString tableAlias = this->tableAlias(params); QString tableOwner = params.builder().table();
    00128       if (! pIdOwner || ! pIdData) { return; }
    00129       QStringList lstForeignKeyOwner = m_sForeignKeyOwner.split("|");
    00130       QStringList lstForeignKeyDataType = m_sForeignKeyDataType.split("|");
    00131       qAssert(pIdOwner->getNameCount() == lstForeignKeyOwner.count());
    00132       qAssert(pIdData->getNameCount() == lstForeignKeyDataType.count());
    00133       sql += this->getSqlJoin() + m_sExtraTable + " ON ";
    00134       for (int i = 0; i < pIdOwner->getNameCount(); i++)
    00135       { sql += pIdOwner->getSqlAlias(tableOwner, true, i) + " = " + m_sExtraTable + "." + lstForeignKeyOwner.at(i) + " AND "; }
    00136       sql = sql.left(sql.count() - 5); // Remove last " AND "
    00137       sql += this->getSqlJoin() + table + " " + tableAlias + " ON ";
    00138       params.builder().addSqlQueryAlias(table, tableAlias);
    00139       for (int i = 0; i < pIdData->getNameCount(); i++)
    00140       { sql += m_sExtraTable + "." + lstForeignKeyDataType.at(i) + " = " + pIdData->getSqlAlias(tableAlias, true, i) + " AND "; }
    00141       sql = sql.left(sql.count() - 5); // Remove last " AND "
    00142    }
    00143
    00144    virtual void eagerWhereSoftDelete(QxSqlRelationParams & params) const
    00145    {
    00146       if (this->m_oSoftDelete.isEmpty()) { return; }
    00147       QString & sql = params.sql();
    00148       QString tableAlias = this->tableAlias(params);
    00149       sql += qx::IxSqlQueryBuilder::addSqlCondition(sql);
    00150       sql += this->m_oSoftDelete.buildSqlQueryToFetch(tableAlias);
    00151    }
    00152
    00153    virtual void eagerFetch_ResolveOutput(QxSqlRelationParams & params) const
    00154    {
    00155       if (! this->verifyOffset(params, true)) { return; }
    00156       QSqlQuery & query = params.query();
    00157       IxDataMember * p = NULL; IxDataMember * pId = this->getDataId(); qAssert(pId);
    00158       long lIndex = 0; long lOffsetId = (pId ? pId->getNameCount() : 0); bool bValidId(false);
    00159       long lOffsetOld = params.offset(); this->updateOffset(true, params);
    00160       for (int i = 0; i < pId->getNameCount(); i++)
    00161       { QVariant v = query.value(lOffsetOld + i); bValidId = (bValidId || qx::trait::is_valid_primary_key(v)); }
    00162       if (! bValidId) { return; }
    00163       type_item item = this->createItem();
    00164       type_data & item_val = item.value_qx();
    00165       for (int i = 0; i < pId->getNameCount(); i++)
    00166       { QVariant v = query.value(lOffsetOld + i); qx::cvt::from_variant(v, item.key(), "", i); }
    00167       for (int i = 0; i < pId->getNameCount(); i++)
    00168       { QVariant v = query.value(lOffsetOld + i); pId->fromVariant((& item_val), v, "", i); }
    00169       while ((p = this->nextData(lIndex)))
    00170       { p->fromVariant((& item_val), query.value(lIndex + lOffsetOld + lOffsetId - 1)); }
    00171       type_generic_container::insertItem(this->getContainer(params), item);
    00172    }
    00173
    00174    virtual QSqlError onAfterSave(QxSqlRelationParams & params) const
    00175    {
    00176       QSqlError daoError = qx::dao::save(this->getContainer(params), (& params.database()));
    00177       if (daoError.isValid()) { return daoError; }
    00178       daoError = this->deleteFromExtraTable(params);
    00179       if (daoError.isValid()) { return daoError; }
    00180       daoError = this->insertIntoExtraTable(params);
    00181       if (daoError.isValid()) { return daoError; }
    00182       return QSqlError();
    00183    }
    00184
    00185    virtual QString createExtraTable() const
    00186    {
    00187       IxDataMember * pIdOwner = this->getDataIdOwner(); qAssert(pIdOwner);
    00188       IxDataMember * pIdData = this->getDataId(); qAssert(pIdData);
    00189       if (! pIdOwner || ! pIdData) { return ""; }
    00190
    00191       bool bOldPKOwner = pIdOwner->getIsPrimaryKey(); pIdOwner->setIsPrimaryKey(false);
    00192       bool bOldPKData = ((pIdOwner == pIdData) ? bOldPKOwner : pIdData->getIsPrimaryKey()); pIdData->setIsPrimaryKey(false);
    00193       bool bOldAIOwner = pIdOwner->getAutoIncrement(); pIdOwner->setAutoIncrement(false);
    00194       bool bOldAIData = ((pIdOwner == pIdData) ? bOldAIOwner : pIdData->getAutoIncrement()); pIdData->setAutoIncrement(false);
    00195
    00196       QString sql = "CREATE TABLE IF NOT EXISTS " + m_sExtraTable + " (";
    00197       sql += pIdOwner->getSqlNameAndTypeAndParams(", ", m_sForeignKeyOwner) + ", "; qAssert(! pIdOwner->getSqlType().isEmpty());
    00198       sql += pIdData->getSqlNameAndTypeAndParams(", ", m_sForeignKeyDataType) + ", "; qAssert(! pIdData->getSqlType().isEmpty());
    00199       sql = sql.left(sql.count() - 2); // Remove last ", "
    00200       sql += ")";
    00201
    00202       pIdOwner->setIsPrimaryKey(bOldPKOwner); pIdData->setIsPrimaryKey(bOldPKData);
    00203       pIdOwner->setAutoIncrement(bOldAIOwner); pIdData->setAutoIncrement(bOldAIData);
    00204       qDebug("[QxOrm] create extra-table (relation many-to-many) : %s", qPrintable(sql));
    00205       return sql;
    00206    }
    00207
    00208 private:
    00209
    00210    inline void verifyParameters()
    00211    { qAssert(! m_sExtraTable.isEmpty() && ! m_sForeignKeyOwner.isEmpty() && ! m_sForeignKeyDataType.isEmpty() && (m_sForeignKeyOwner != m_sForeignKeyDataType)); }
    00212
    00213    QSqlError deleteFromExtraTable(QxSqlRelationParams & params) const
    00214    {
    00215       IxDataMember * pIdOwner = params.builder().getDataId(); qAssert(pIdOwner);
    00216       QString sql = "DELETE FROM " + m_sExtraTable + " WHERE ";
    00217       QStringList lstForeignKeyOwner = m_sForeignKeyOwner.split("|");
    00218       qAssert(pIdOwner->getNameCount() == lstForeignKeyOwner.count());
    00219       for (int i = 0; i < pIdOwner->getNameCount(); i++)
    00220       { sql += m_sExtraTable + "." + lstForeignKeyOwner.at(i) + " = " + pIdOwner->getSqlPlaceHolder("", i) + " AND "; }
    00221       sql = sql.left(sql.count() - 5); // Remove last " AND "
    00222       qDebug("[QxOrm] sql query (extra-table) : %s", qPrintable(sql));
    00223
    00224       QSqlQuery queryDelete(params.database());
    00225       queryDelete.prepare(sql);
    00226       pIdOwner->setSqlPlaceHolder(queryDelete, params.owner());
    00227       if (! queryDelete.exec()) { return queryDelete.lastError(); }
    00228       return QSqlError();
    00229    }
    00230
    00231    QSqlError insertIntoExtraTable(QxSqlRelationParams & params) const
    00232    {
    00233       IxDataMember * pIdOwner = params.builder().getDataId(); qAssert(pIdOwner);
    00234       IxDataMember * pIdData = this->getDataId(); qAssert(pIdData);
    00235       if (! pIdOwner || ! pIdData) { return QSqlError(); }
    00236       QStringList lstForeignKeyOwner = m_sForeignKeyOwner.split("|");
    00237       QStringList lstForeignKeyDataType = m_sForeignKeyDataType.split("|");
    00238       qAssert(pIdOwner->getNameCount() == lstForeignKeyOwner.count());
    00239       qAssert(pIdData->getNameCount() == lstForeignKeyDataType.count());
    00240
    00241       QString sql = "INSERT INTO " + m_sExtraTable + " (";
    00242       sql += pIdOwner->getSqlName(", ", m_sForeignKeyOwner) + ", " + pIdData->getSqlName(", ", m_sForeignKeyDataType);
    00243       sql += ") VALUES (";
    00244       sql += pIdOwner->getSqlPlaceHolder("", -1, ", ", m_sForeignKeyOwner) + ", " + pIdData->getSqlPlaceHolder("", -1, ", ", m_sForeignKeyDataType) + ")";
    00245       qDebug("[QxOrm] sql query (extra-table) : %s", qPrintable(sql));
    00246
    00247       type_item item;
    00248       type_container container = this->getContainer(params);
    00249       type_iterator itr = type_generic_container::begin(container, item);
    00250       type_iterator itr_end = type_generic_container::end(container);
    00251       QSqlQuery queryInsert(params.database());
    00252       queryInsert.prepare(sql);
    00253
    00254       while (itr != itr_end)
    00255       {
    00256          pIdOwner->setSqlPlaceHolder(queryInsert, params.owner(), "", m_sForeignKeyOwner);
    00257          pIdData->setSqlPlaceHolder(queryInsert, (& item.value_qx()), "", m_sForeignKeyDataType);
    00258          if (! queryInsert.exec()) { return queryInsert.lastError(); }
    00259          itr = type_generic_container::next(container, itr, item);
    00260       }
    00261
    00262       return QSqlError();
    00263    }
    00264
    00265 };
    00266
    00267 } // namespace qx
    00268
    00269 #endif // _QX_SQL_RELATION_MANY_TO_MANY_H_