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QxOrm 1.1.6
C++ Object Relational Mapping library
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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_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_