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/*
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* Copyright (C) 2015 Christian Ehringfeld <c.ehringfeld@t-online.de>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef ENTITYMANAGER_H
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#define ENTITYMANAGER_H
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#include <QtSql/QSqlDatabase>
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#include <QtSql/QSqlRecord>
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#include <QtSql/QSqlField>
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#include <QString>
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#include <QStringList>
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#include <QObject>
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#include <QSharedPointer>
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#include <QDebug>
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#include <QtSql/QSqlError>
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#include <QMetaType>
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#include "schema.h"
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#include "entity.h"
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#include "database.h"
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#include "entityinstancefactory.h"
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#include "queryinterpreter.h"
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#include "cache.h"
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#include "querybuilder.h"
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#include "validators/errormsg.h"
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#include "attribute.h"
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namespace CuteEntityManager {
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#ifdef QT_DEBUG
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#define DEFAULTMSGTYPE MsgType::DEBUG
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#define INSPECTENTITIES true
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#else
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#define DEFAULTMSGTYPE MsgType::CRITICAL
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#define INSPECTENTITIES false
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#endif
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class AttributeResolver;
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class Logger;
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class QueryInterpreter;
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class EntityManager : public QObject {
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Q_OBJECT
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public slots:
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/**
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* @brief startup
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* @param version must be unique
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* @param toInitialize list of entity classnames which database tables should be created
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* @return
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*/
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bool startup(QString version, QStringList toInitialize,
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bool createIndices = false);
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bool executeQuery(const QString &query);
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QSharedPointer<Entity> findById(const qint64 &id, const QString &classname,
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const bool refresh = false);
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QList<QSharedPointer<Entity>> findEntityByAttributes(const
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QSharedPointer<Entity> &entity,
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bool ignoreID = false, const bool resolveRelations = true);
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qint64 findId(QSharedPointer<Entity> &entity);
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/**
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* @todo should be an insert statement with many values
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* @todo error handling
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* @brief EntityManager::create
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* @param entities
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* @return
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*/
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bool create(QList<QSharedPointer<Entity>> &entities, const bool persistRelations = true,
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const bool checkDuplicate = false, const bool validate = true,
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const bool relationsIgnoreHasChanged = false);
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bool save(QList<QSharedPointer<Entity>> &entities,
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const bool persistRelations = true,
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const bool ignoreHasChanged = false, const bool validate = true,
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const bool relationsIgnoreHasChanged = false);
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bool removeAll(QString tblname);
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bool createTable(const QSharedPointer<Entity> &entity,
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bool createRelationTables = true);
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bool createTable(QString className, bool createRelationTables = true);
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bool removeTable(QString className);
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quint32 count(const QSharedPointer<Entity> &entity, bool ignoreID = true,
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bool joinBaseClasses = false);
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quint32 count(const QString &tableName);
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QSharedPointer<Database> getDb() const;
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void setDb(const QSharedPointer<Database> &value);
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QSharedPointer<Schema> getSchema() const;
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QList<QHash<QString, QVariant>> selectByQuery(Query &query);
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QList<QHash<QString, QVariant>> selectBySql(const QString &sql);
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quint32 count(Query &query);
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/**
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* @brief EntityManager::validate
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* This validates an entity. Its uses the validationRules() method of the specified entity.
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* If there are validation errors, this method will set these errors in the entity object.
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* You can check them with entity->hasErrors(), entity->getErrors() or entity->getErrorsAsString()
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* @param entity
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* @return true if it has no validation errors, false if it has errors
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*/
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bool validate(QSharedPointer<Entity> &entity);
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/**
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* @brief hasChanged
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* @param entity
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* @todo check manyToMany relations
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* @return
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*/
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bool hasChanged(QSharedPointer<Entity> &entity);
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public:
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EntityManager(QSqlDatabase database, bool logQueries = false,
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const bool inspectEntities = INSPECTENTITIES,
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MsgType logActions = DEFAULTMSGTYPE);
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EntityManager(const QString &databaseType, QString databasename = "" ,
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QString hostname = "",
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QString username = "",
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QString password = "", QString port = "", bool logQueries = false,
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QString databaseOptions = "", const bool inspectEntities = INSPECTENTITIES,
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MsgType logActions = DEFAULTMSGTYPE);
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virtual ~EntityManager();
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static QStringList getConnectionNames();
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static void removeConnectionName(const QString &name);
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static QHash<QString, EntityManager *> getInstances();
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static EntityManager *getDefaultInstance();
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static EntityManager *getInstance(QString name);
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QSharedPointer<QueryBuilder> getQueryBuilder() const;
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/**
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* @brief clearCache
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* don't use this function. It's only for test purposes.
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*/
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void clearCache();
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template<class T> QList<QSharedPointer<T>> find(Query &q,
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const bool joinBaseClasses = false, const bool resolveRelations = true) {
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QSharedPointer<Entity> ptr = QSharedPointer<Entity>
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(EntityInstanceFactory::createInstance<T *>());
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if (ptr) {
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if (q.getFrom().isEmpty()) {
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q.setFrom(QStringList(ptr->getTablename()));
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}
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if (joinBaseClasses) {
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q.appendJoins(this->schema->getQueryBuilder()->joinBaseClasses(ptr));
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}
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QSqlQuery query = this->queryInterpreter->build(q, ptr->metaObject());
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auto maps = this->convertQueryResult(query);
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auto converted = this->convert(maps, EntityHelper::getClassname(ptr.data()),
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resolveRelations);
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return EntityManager::convertList<T>(converted);
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}
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return QList<QSharedPointer<T>>();
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}
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template<class T> quint32 countEntities(Query &q, const bool joinBaseClasses = true) {
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auto instance = QSharedPointer<Entity>(EntityInstanceFactory::createInstance<T *>());
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quint32 count = 0;
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if (instance) {
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if (q.getFrom().isEmpty()) {
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q.setFrom(QStringList(instance->getTablename()));
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}
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if (joinBaseClasses) {
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q.appendJoins(this->schema->getQueryBuilder()->joinBaseClasses(instance));
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}
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q.appendSelect("COUNT(*)");
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QSqlQuery query = this->queryInterpreter->build(q);
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this->db->select(query);
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if (query.next()) {
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count = query.value(0).toInt();
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}
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}
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return count;
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}
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template<class T>
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bool remove(QSharedPointer<T> &entity) {
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static_assert(std::is_base_of<Entity, T>::value, "T must inherit from Entity");
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bool rc = false;
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this->db->startTransaction();
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this->removeRelations(entity);
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auto queries = this->schema->getQueryBuilder()->remove(entity);
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bool ok = this->db->exec(queries);
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if (ok && this->db->commitTransaction()) {
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this->cache.remove(entity);
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entity.clear();
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rc = true;
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} else {
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this->db->rollbackTransaction();
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}
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return rc;
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}
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template<class T>
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bool merge(QSharedPointer<T> &entity, bool withRelations = true,
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const bool validate = true, const bool relationsIgnoreHasChanged = false) {
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static_assert(std::is_base_of<Entity, T>::value, "T must inherit from Entity");
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auto merged = QList<Entity *>();
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QSharedPointer<Entity> e = entity;
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return this->mergeObject(e, merged, withRelations, validate,
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relationsIgnoreHasChanged);
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}
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/**
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* @brief EntityManager::save
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* If the entity has no valid ID, this method will call the create() method. Else it would call the merge method.
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* @param entity
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* @param persistRelations
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* @param ignoreHasChanged
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* @param validate
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* @return bool
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*/
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template<class T>
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bool save(QSharedPointer<T> &entity, const bool persistRelations = true,
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const bool ignoreHasChanged = false, const bool validate = true,
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const bool relationsIgnoreHasChanged = false) {
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static_assert(std::is_base_of<Entity, T>::value, "T must inherit from Entity");
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auto merged = QList<Entity *>();
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QSharedPointer<Entity> e = entity;
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return this->saveObject(e, merged, persistRelations,
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ignoreHasChanged, validate, relationsIgnoreHasChanged);
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}
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/**
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* @brief EntityManager::refresh
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* fetches an entity again from the database
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* @param entity
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*/
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template<typename T>
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void refresh(QSharedPointer<T> entity, const bool resolveRelations = true) {
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static_assert(std::is_base_of<Entity, T>::value, "T must inherit from Entity");
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if(entity) {
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auto map = this->findByPk(entity->getId(), entity);
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QSharedPointer<Entity> e = entity;
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this->convert(map, e, resolveRelations);
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}
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}
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/**
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* @brief EntityManager::create
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* Will persist an entity in the database. Before its persisted it has the id -1(invalid id). If database persisting was succesfull it has a valid id.
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* @param entity
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* @param persistRelations
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* @param checkDuplicate
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* @param validate
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* @return
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*/
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template<typename T>
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bool create(QSharedPointer<T> &entity, const bool persistRelations = true,
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const bool checkDuplicate = false, const bool validate = true,
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const bool relationsIgnoreHasChanged = false) {
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static_assert(std::is_base_of<Entity, T>::value, "T must inherit from Entity");
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auto merged = QList<Entity *>();
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QSharedPointer<Entity> e = entity;
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return this->createObject(e, merged, persistRelations,
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checkDuplicate, validate, relationsIgnoreHasChanged);
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}
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template<class T> QList<QSharedPointer<T>> findAll(const bool resolveRelations = true) {
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QSharedPointer<Entity> ptr = QSharedPointer<Entity>
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(EntityInstanceFactory::createInstance<T *>());
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if (ptr) {
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auto maps = this->findAll(ptr);
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auto converted = this->convert(maps, EntityHelper::getClassname(ptr.data()),
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resolveRelations);
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return EntityManager::convertList<T>(converted);
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}
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return QList<QSharedPointer<T>>();
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}
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template<class T> QSharedPointer<T> findById(const qint64 &id,
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const bool refresh = false) {
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auto e = EntityInstanceFactory::createInstance<T *>();
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QSharedPointer<Entity> ptr = QSharedPointer<Entity>(e);
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return this->findById(id, ptr, refresh).objectCast<T>();
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}
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template<class T>
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QSharedPointer<T> findEntityByAttributes(
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const QHash<QString, QVariant>
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&attributes, const bool joinBaseClasses = false,
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const bool resolveRelations = true) {
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auto list = this->findAllEntitiesByAttributes<T>(attributes, 1, 0,
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joinBaseClasses, resolveRelations);
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if (list.isEmpty()) {
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return QSharedPointer<T>();
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}
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QSharedPointer<Entity> obj = list.at(0);
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return obj.objectCast<T>();
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}
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template<class T> QList<QSharedPointer<T>> findAllEntitiesByAttributes(
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const QHash<QString, QVariant> &attributes =
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QHash<QString, QVariant>(), quint64 limit = 0, quint64 offset = 0,
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bool joinBaseClasses = false, const bool resolveRelations = true) {
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QSharedPointer<Entity> e = QSharedPointer<Entity>
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(EntityInstanceFactory::createInstance<T*>());
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if (e) {
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Query query = Query(QStringList(e->getTablename()));
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if (joinBaseClasses) {
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query.appendJoins(this->schema->getQueryBuilder()->joinBaseClasses(e));
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}
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query.appendWhere(this->schema->getQueryBuilder()->where(attributes));
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query.setLimit(limit);
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query.setOffset(offset);
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QSqlQuery q = this->queryInterpreter->build(query);
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auto results = this->convertQueryResult(q);
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auto list = this->convert(results, EntityHelper::getClassname(e.data()),
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resolveRelations);
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return EntityManager::convertList<T>(list);
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}
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return QList<QSharedPointer<T>>();
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}
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template<class T> QList<QSharedPointer<T>> findEntitiesBySql(
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const QString &sql) {
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auto e = EntityInstanceFactory::createInstance<T *>();
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if (e) {
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QSqlQuery q = this->schema->getDatabase()->getQuery(sql);
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auto result = this->convertQueryResult(q);
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auto converted = this->convert(result, EntityHelper::getClassname(e));
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return EntityManager::convertList<T>(converted);
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}
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return QList<QSharedPointer<T>>();
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}
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template<class T> bool remove(const QList<qint64> &ids) {
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bool ok = true;
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foreach (qint64 var, ids) {
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if (!this->remove<T *>(var)) {
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ok = false;
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break;
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}
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}
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return ok;
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}
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template<class T> bool remove(qint64 id) {
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Entity *e = EntityInstanceFactory::createInstance<T *>();
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if (e) {
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QSharedPointer<Entity> ptr = QSharedPointer<Entity>(e);
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ptr->setId(id);
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return this->remove(ptr);
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}
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return false;
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}
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template<class T, class X>
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static QList<QSharedPointer<T>> convertList(const QList<QSharedPointer<X>> &list) {
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QList<QSharedPointer<T>> newList = QList<QSharedPointer<T>>();
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for (int i = 0; i < list.size(); ++i) {
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newList.append(qSharedPointerObjectCast<T>(list.at(i)));
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}
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return newList;
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}
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protected:
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bool saveObject(QSharedPointer<Entity> &entity, QList<Entity *> &mergedObjects,
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const bool persistRelations = true,
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const bool ignoreHasChanged = false, const bool validate = true,
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const bool relationsIgnoreHasChanged = false);
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bool mergeObject(QSharedPointer<Entity> &entity, QList<Entity *> &mergedObjects,
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bool withRelations,
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const bool validate, const bool relationsIgnoreHasChanged = false);
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bool createObject(QSharedPointer<Entity> &entity,
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QList<Entity *> &mergedObjects, const bool persistRelations,
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const bool checkDuplicate, const bool validate,
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const bool relationsIgnoreHasChanged = false);
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void init(bool inspect, const MsgType msgType);
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QList<QHash<QString, QVariant>> findAll(const QSharedPointer<Entity> &e);
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void resolveRelations(const QSharedPointer<Entity> &entity,
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const QHash<QString, QVariant> &map);
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QHash<QString, QVariant> findByPk(qint64 id, const QSharedPointer<Entity> &e);
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void manyToOne(const QSharedPointer<Entity> &entity, const QVariant &id,
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Attribute *&attr);
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void oneToMany(const QSharedPointer<Entity> &entity, Attribute *&attr);
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void manyToMany(const QSharedPointer<Entity> &entity, Attribute *&attr);
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void oneToOne(const QSharedPointer<Entity> &entity, Attribute *&attr,
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const QVariant &id = "");
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void persistManyToMany(const QSharedPointer<Entity> &entity, const Relation &r,
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QVariant &property, QList<Entity *> &mergedObjects,
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const bool ignoreHasChanged = false, const bool newItem = false);
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QList<QHash<QString, QVariant>> findAllByAttributes(const
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QSharedPointer<Entity> &entity,
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bool ignoreID = false);
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QList<QHash<QString, QVariant>> findAllByAttributes(const
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QHash<QString, QVariant> &m,
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const QString &tblname,
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bool ignoreID = false);
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QSharedPointer<Entity> findById(const qint64 &id, QSharedPointer<Entity> &e,
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const bool refresh = false);
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/**
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* @brief EntityManager::savePrePersistedRelations
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* @param entity
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* @param mergedObjects
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* @throw can throw in debug mode a QString exception when the type of any Relation is wrong @see EntityManager::checkRelation
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*/
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void savePrePersistedRelations(const QSharedPointer<Entity> &entity,
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QList<Entity *> &mergedObjects, bool ignoreHasChanged = false);
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/**
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* @brief EntityManager::savePostPersistedRelations
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* @param entity
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* @param mergedObjects
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* @throw can throw in debug mode a QString exception when the type of any Relation is wrong @see EntityManager::checkRelation
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*/
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void savePostPersistedRelations(const QSharedPointer<Entity> &entity,
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QList<Entity *> &mergedObjects, bool ignoreHasChanged = false,
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bool newItem = false);
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QList<QSharedPointer<Entity>> saveRelationEntities(const
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QList<QSharedPointer<Entity>> &list, const Relation &r,
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QList<Entity *> &mergedObjects);
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/**
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* @brief EntityManager::persistManyToMany
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* @param entity
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* @param r
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* @param property
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* @param mergedObjects
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* @todo compare old values with new values if nothing has changed don't persist them
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*/
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void persistMappedByRelation(const QList<QSharedPointer<Entity>> &list,
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QSqlQuery &q, const QSharedPointer<Entity> &entity,
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const QSharedPointer<Entity> &ptr, const Relation &r,
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const QString &tblName, QList<Entity *> &mergedObjects);
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bool shouldBeSaved(QSharedPointer<Entity> &entity , const Relation &r);
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void removeRelations(const QSharedPointer<Entity> &entity);
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void removeEntityList(QVariant &var);
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void removeManyToManyEntityList(const QSharedPointer<Entity> &e,
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const Relation &r, QVariant &var);
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void removeEntity(QVariant &var);
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void setNullOneToManyRelation(QVariant &var, const Relation &r);
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void setNullEntityPropertyRelation(QVariant &var, const Relation &r);
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QSharedPointer<Entity> convert(const QHash<QString, QVariant> &map,
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const char *classname,
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const bool resolveRelations = true);
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void convert(const QHash<QString, QVariant> &map, QSharedPointer<Entity> &entity,
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const bool resolveRelations = true);
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QList<QSharedPointer<Entity>> convert(QList<QHash<QString, QVariant>> maps,
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const char *classname, const bool resolveRelations = true);
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void missingManyToManyTable(const QString &tblName,
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const QSharedPointer<Entity> &e, const Relation &r);
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/**
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* @brief EntityManager::generateObjectName
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* Generates a object name with this scheme: em[anyNumber]
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* @return
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*/
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QString generateObjectName();
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void appendToInstanceList();
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private:
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static QStringList connectionNames;
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static QHash<QString, EntityManager *> instances;
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QSharedPointer<Logger> logger;
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QSharedPointer<AttributeResolver> ar;
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QString id;
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QSharedPointer<Schema> schema;
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static void setConnectionNames(QStringList list);
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QSharedPointer<Database> db;
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Cache cache;
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QString createConnection();
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QList<QHash<QString, QVariant>> convertQueryResult(QSqlQuery &q);
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/**
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* @brief EntityManager::checkTable
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* Checks if a table has been already created, if not it will create it
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* @param entity
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* @return
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*/
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bool checkTable(const QSharedPointer<Entity> &entity);
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QSharedPointer<QueryInterpreter> queryInterpreter;
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};
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}
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Q_DECLARE_METATYPE(QSharedPointer<CuteEntityManager::Entity>)
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#endif // ENTITYMANAGER_H
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