![]() |
QxOrm 1.1.9
C++ Object Relational Mapping library
|
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_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_