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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->m_eRelationType = qx::IxSqlRelation::many_to_many; 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 = this->getDataIdOwner(); qAssert(pIdOwner);
    00126       IxDataMember * pIdData = this->getDataId(); qAssert(pIdData);
    00127       QString table = this->table(); QString tableAlias = this->tableAlias(params);
    00128       QString tableOwner = this->tableAliasOwner(params);
    00129       if (! pIdOwner || ! pIdData) { return; }
    00130       QStringList lstForeignKeyOwner = m_sForeignKeyOwner.split("|");
    00131       QStringList lstForeignKeyDataType = m_sForeignKeyDataType.split("|");
    00132       qAssert(pIdOwner->getNameCount() == lstForeignKeyOwner.count());
    00133       qAssert(pIdData->getNameCount() == lstForeignKeyDataType.count());
    00134       QString sExtraTableAlias = m_sExtraTable + "_" + QString::number(params.index());
    00135       sql += this->getSqlJoin(params.joinType()) + m_sExtraTable + " " + sExtraTableAlias + " ON ";
    00136       for (int i = 0; i < pIdOwner->getNameCount(); i++)
    00137       { sql += pIdOwner->getSqlAlias(tableOwner, true, i) + " = " + sExtraTableAlias + "." + lstForeignKeyOwner.at(i) + " AND "; }
    00138       sql = sql.left(sql.count() - 5); // Remove last " AND "
    00139       sql += this->getSqlJoin(params.joinType()) + table + " " + tableAlias + " ON ";
    00140       params.builder().addSqlQueryAlias(table, tableAlias);
    00141       for (int i = 0; i < pIdData->getNameCount(); i++)
    00142       { sql += sExtraTableAlias + "." + lstForeignKeyDataType.at(i) + " = " + pIdData->getSqlAlias(tableAlias, true, i) + " AND "; }
    00143       sql = sql.left(sql.count() - 5); // Remove last " AND "
    00144    }
    00145
    00146    virtual void eagerWhereSoftDelete(QxSqlRelationParams & params) const
    00147    {
    00148       if (this->m_oSoftDelete.isEmpty()) { return; }
    00149       QString & sql = params.sql();
    00150       QString tableAlias = this->tableAlias(params);
    00151       sql += qx::IxSqlQueryBuilder::addSqlCondition(sql);
    00152       sql += this->m_oSoftDelete.buildSqlQueryToFetch(tableAlias);
    00153    }
    00154
    00155    virtual void * eagerFetch_ResolveOutput(QxSqlRelationParams & params) const
    00156    {
    00157       if (! this->verifyOffset(params, true)) { return NULL; }
    00158       QSqlQuery & query = params.query();
    00159       IxDataMember * p = NULL; IxDataMember * pId = this->getDataId(); qAssert(pId);
    00160       long lIndex = 0; long lOffsetId = (pId ? pId->getNameCount() : 0); bool bValidId(false);
    00161       long lOffsetOld = params.offset(); this->updateOffset(true, params);
    00162       for (int i = 0; i < pId->getNameCount(); i++)
    00163       { QVariant v = query.value(lOffsetOld + i); bValidId = (bValidId || qx::trait::is_valid_primary_key(v)); }
    00164       if (! bValidId) { return NULL; }
    00165       type_item item = this->createItem();
    00166       type_data & item_val = item.value_qx();
    00167       for (int i = 0; i < pId->getNameCount(); i++)
    00168       { QVariant v = query.value(lOffsetOld + i); qx::cvt::from_variant(v, item.key(), "", i); }
    00169       for (int i = 0; i < pId->getNameCount(); i++)
    00170       { QVariant v = query.value(lOffsetOld + i); pId->fromVariant((& item_val), v, "", i); }
    00171       while ((p = this->nextData(lIndex)))
    00172       { p->fromVariant((& item_val), query.value(lIndex + lOffsetOld + lOffsetId - 1)); }
    00173       type_generic_container::insertItem(this->getContainer(params), item);
    00174       return (& item_val);
    00175    }
    00176
    00177    virtual QSqlError onAfterSave(QxSqlRelationParams & params) const
    00178    {
    00179       if (this->isNullData(params)) { return this->deleteFromExtraTable(params); }
    00180       QSqlError daoError = qx::dao::save(this->getContainer(params), (& params.database()));
    00181       if (daoError.isValid()) { return daoError; }
    00182       daoError = this->deleteFromExtraTable(params);
    00183       if (daoError.isValid()) { return daoError; }
    00184       daoError = this->insertIntoExtraTable(params);
    00185       if (daoError.isValid()) { return daoError; }
    00186       return QSqlError();
    00187    }
    00188
    00189    virtual QString createExtraTable() const
    00190    {
    00191       IxDataMember * pIdOwner = this->getDataIdOwner(); qAssert(pIdOwner);
    00192       IxDataMember * pIdData = this->getDataId(); qAssert(pIdData);
    00193       if (! pIdOwner || ! pIdData) { return ""; }
    00194
    00195       bool bOldPKOwner = pIdOwner->getIsPrimaryKey(); pIdOwner->setIsPrimaryKey(false);
    00196       bool bOldPKData = ((pIdOwner == pIdData) ? bOldPKOwner : pIdData->getIsPrimaryKey()); pIdData->setIsPrimaryKey(false);
    00197       bool bOldAIOwner = pIdOwner->getAutoIncrement(); pIdOwner->setAutoIncrement(false);
    00198       bool bOldAIData = ((pIdOwner == pIdData) ? bOldAIOwner : pIdData->getAutoIncrement()); pIdData->setAutoIncrement(false);
    00199
    00200       QString sql = "CREATE TABLE IF NOT EXISTS " + m_sExtraTable + " (";
    00201       sql += pIdOwner->getSqlNameAndTypeAndParams(", ", m_sForeignKeyOwner) + ", "; qAssert(! pIdOwner->getSqlType().isEmpty());
    00202       sql += pIdData->getSqlNameAndTypeAndParams(", ", m_sForeignKeyDataType) + ", "; qAssert(! pIdData->getSqlType().isEmpty());
    00203       sql = sql.left(sql.count() - 2); // Remove last ", "
    00204       sql += ")";
    00205
    00206       pIdOwner->setIsPrimaryKey(bOldPKOwner); pIdData->setIsPrimaryKey(bOldPKData);
    00207       pIdOwner->setAutoIncrement(bOldAIOwner); pIdData->setAutoIncrement(bOldAIData);
    00208       if (this->traceSqlQuery()) { qDebug("[QxOrm] create extra-table (relation many-to-many) : %s", qPrintable(sql)); }
    00209       return sql;
    00210    }
    00211
    00212 private:
    00213
    00214    inline void verifyParameters()
    00215    { qAssert(! m_sExtraTable.isEmpty() && ! m_sForeignKeyOwner.isEmpty() && ! m_sForeignKeyDataType.isEmpty() && (m_sForeignKeyOwner != m_sForeignKeyDataType)); }
    00216
    00217    QSqlError deleteFromExtraTable(QxSqlRelationParams & params) const
    00218    {
    00219       IxDataMember * pIdOwner = this->getDataIdOwner(); qAssert(pIdOwner);
    00220       QString sql = "DELETE FROM " + m_sExtraTable + " WHERE ";
    00221       QStringList lstForeignKeyOwner = m_sForeignKeyOwner.split("|");
    00222       qAssert(pIdOwner->getNameCount() == lstForeignKeyOwner.count());
    00223       for (int i = 0; i < pIdOwner->getNameCount(); i++)
    00224       { sql += m_sExtraTable + "." + lstForeignKeyOwner.at(i) + " = " + pIdOwner->getSqlPlaceHolder("", i) + " AND "; }
    00225       sql = sql.left(sql.count() - 5); // Remove last " AND "
    00226       if (this->traceSqlQuery()) { qDebug("[QxOrm] sql query (extra-table) : %s", qPrintable(sql)); }
    00227
    00228       QSqlQuery queryDelete(params.database());
    00229       queryDelete.prepare(sql);
    00230       pIdOwner->setSqlPlaceHolder(queryDelete, params.owner());
    00231       if (! queryDelete.exec()) { return queryDelete.lastError(); }
    00232       return QSqlError();
    00233    }
    00234
    00235    QSqlError insertIntoExtraTable(QxSqlRelationParams & params) const
    00236    {
    00237       IxDataMember * pIdOwner = this->getDataIdOwner(); qAssert(pIdOwner);
    00238       IxDataMember * pIdData = this->getDataId(); qAssert(pIdData);
    00239       if (! pIdOwner || ! pIdData) { return QSqlError(); }
    00240       QStringList lstForeignKeyOwner = m_sForeignKeyOwner.split("|");
    00241       QStringList lstForeignKeyDataType = m_sForeignKeyDataType.split("|");
    00242       qAssert(pIdOwner->getNameCount() == lstForeignKeyOwner.count());
    00243       qAssert(pIdData->getNameCount() == lstForeignKeyDataType.count());
    00244
    00245       QString sql = "INSERT INTO " + m_sExtraTable + " (";
    00246       sql += pIdOwner->getSqlName(", ", m_sForeignKeyOwner) + ", " + pIdData->getSqlName(", ", m_sForeignKeyDataType);
    00247       sql += ") VALUES (";
    00248       sql += pIdOwner->getSqlPlaceHolder("", -1, ", ", m_sForeignKeyOwner) + ", " + pIdData->getSqlPlaceHolder("", -1, ", ", m_sForeignKeyDataType) + ")";
    00249       if (this->traceSqlQuery()) { qDebug("[QxOrm] sql query (extra-table) : %s", qPrintable(sql)); }
    00250
    00251       type_item item;
    00252       type_container & container = this->getContainer(params);
    00253       type_iterator itr = type_generic_container::begin(container, item);
    00254       type_iterator itr_end = type_generic_container::end(container);
    00255       QSqlQuery queryInsert(params.database());
    00256       queryInsert.prepare(sql);
    00257
    00258       while (itr != itr_end)
    00259       {
    00260          pIdOwner->setSqlPlaceHolder(queryInsert, params.owner(), "", m_sForeignKeyOwner);
    00261          pIdData->setSqlPlaceHolder(queryInsert, (& item.value_qx()), "", m_sForeignKeyDataType);
    00262          if (! queryInsert.exec()) { return queryInsert.lastError(); }
    00263          itr = type_generic_container::next(container, itr, item);
    00264       }
    00265
    00266       return QSqlError();
    00267    }
    00268
    00269 };
    00270
    00271 } // namespace qx
    00272
    00273 #endif // _QX_SQL_RELATION_MANY_TO_MANY_H_