QSqlDatabase的进一步封装(多线程支持+更加简单的操作)——同时支持MySQL, SQL Server和Sqlite
开发背景:
1.直接用QSqlDatabase我觉得太麻烦了;
2.对于某些数据库,多个线程同时使用一个QSqlDatabase的时候会崩溃;
3.这段时间没什么干货放出来觉得浑身不舒服,就想写一个。
于是,我就封装了一下
只要简单的实例化,然后通过query()就可以拿到QSqlQuery的实例化对象。
还自带计时,一段时间不用可自动关闭,既保证效率也不占用无用资源。
注:需要C++11的支持
不多说,上代码:
JasonQt_Database.h
- #ifndef __JasonQt_Database_h__
- #define __JasonQt_Database_h__
- // C++ lib import
- #include <functional>
- // Qt lib import
- #include <QtCore>
- #include <QtSql>
- #define PropertyDeclare(Type, Name, setName, ...) \
- private: \
- Type m_ ## Name __VA_ARGS__; \
- public: \
- inline const Type &Name(void) const { return m_ ## Name; } \
- inline void setName(const Type &Name) { m_ ## Name = Name; } \
- private:
- namespace JasonQt_Database
- {
- enum DatabaseModeEnum{ DatabaseNameMode, DatabaseHostMode };
- enum QueryMode { QueryAutoMode, QueryMultiMode, QuerySingleMode };
- class DatabaseSettings
- {
- private:
- PropertyDeclare(DatabaseModeEnum, databaseMode, setDatabaseMode)
- PropertyDeclare(QString, databaseType, setDatabaseType)
- PropertyDeclare(QString, connectionName, setConnectionName)
- // File mode
- PropertyDeclare(QString, nameModeName, setNameModeName)
- // Host mode
- PropertyDeclare(QString, hostModeHostName, setHostModeHostName)
- PropertyDeclare(QString, hostModeDatabaseName, setHostModeDatabaseName)
- PropertyDeclare(QString, hostModeUserName, setHostModeUserName)
- PropertyDeclare(QString, hostModePassword, setHostModePassword)
- private:
- DatabaseSettings(const DatabaseModeEnum &databastMode, const QString &databaseType, const QString &connectionName);
- public:
- DatabaseSettings(const QString &databaseType, const QString &connectionName, const QString &nameModeName);
- DatabaseSettings(const QString &databaseType, const QString &connectionName, const QString &hostModeHostName, const QString &hostModeDatabaseName, const QString &hostModeUserName, const QString &hostModePassword);
- };
- class ConnectSettings
- {
- private:
- PropertyDeclare(int, maxOpenTime, setMaxOpenTime)
- PropertyDeclare(QueryMode, queryMode, setQueryMode)
- PropertyDeclare(int, minWaitTime, setMinWaitTime)
- public:
- ConnectSettings(const int &maxOpenTime = 60 * 1000, const QueryMode &queryMode = QueryAutoMode, const int &minWaitTime = -1);
- };
- class Query
- {
- private:
- QSqlQuery *m_query;
- QMutex *m_mutex = NULL;
- public:
- Query(QSqlDatabase &dataBase, QMutex *mutex = NULL);
- Query(Query &&other);
- ~Query(void);
- inline QSqlQuery *operator->(void) { return m_query; }
- inline QSqlQuery *operator*(void) { return m_query; }
- QSqlQuery *takeQuery(void);
- QMutex *takeMutex(void);
- };
- class ConnectNode: public QObject
- {
- Q_OBJECT
- private:
- QSqlDatabase *m_database = NULL;
- QString m_connectionName;
- DatabaseSettings m_dataBaseSettings;
- ConnectSettings m_connectSettings;
- QTimer *m_autoClose = NULL;
- QMutex *m_mutex = NULL;
- public:
- ConnectNode(const DatabaseSettings &dataBaseSettings, const ConnectSettings &connectSettings);
- ~ConnectNode(void);
- public:
- Query query(void);
- public slots:
- bool addDataBase(void);
- void removeDataBase(void);
- bool open(void);
- void close(void);
- signals:
- void controlStartAutoClose(void);
- void controlStopAutoClose(void);
- };
- class Control
- {
- private:
- DatabaseSettings m_databaseSettings;
- ConnectSettings m_connectSettings;
- QMap<qint64, ConnectNode *> m_node;
- QMutex m_mutex;
- QTime *m_wait = NULL;
- public:
- Control(const DatabaseSettings &databaseSettings, const ConnectSettings &connectSettings = ConnectSettings());
- Control(const Control &) = delete;
- ~Control(void);
- public:
- void removeAll(void);
- Query query(void);
- private:
- void insert(const qint64 &key);
- };
- }
- #endif//__JasonQt_Database_h__
JasonQt_Database.cpp
- #include "JasonQt_Database.h"
- using namespace JasonQt_Database;
- // DatabaseSettings
- DatabaseSettings::DatabaseSettings(const DatabaseModeEnum &databastMode, const QString &databaseType, const QString &connectionName)
- {
- m_databaseMode = databastMode;
- m_databaseType = databaseType;
- m_connectionName = connectionName;
- }
- DatabaseSettings::DatabaseSettings(const QString &databaseType, const QString &connectionName, const QString &nameModeName):
- DatabaseSettings(DatabaseNameMode, databaseType, connectionName)
- {
- m_nameModeName = nameModeName;
- }
- DatabaseSettings::DatabaseSettings(const QString &databaseType, const QString &connectionName, const QString &hostModeHostName, const QString &hostModeDatabaseName, const QString &hostModeUserName, const QString &hostModePassword):
- DatabaseSettings(DatabaseHostMode, databaseType, connectionName)
- {
- m_hostModeHostName = hostModeHostName;
- m_hostModeDatabaseName = hostModeDatabaseName;
- m_hostModeUserName = hostModeUserName;
- m_hostModePassword = hostModePassword;
- }
- // ConnectSettings
- ConnectSettings::ConnectSettings(const int &maxOpenTime, const QueryMode &queryMode, const int &minWaitTime)
- {
- m_maxOpenTime = maxOpenTime;
- m_queryMode = queryMode;
- m_minWaitTime = minWaitTime;
- }
- // Query
- Query::Query(QSqlDatabase &dataBase, QMutex *mutex):
- m_query(new QSqlQuery(dataBase))
- {
- m_mutex = mutex;
- }
- Query::Query(Query &&other)
- {
- m_query = other.takeQuery();
- m_mutex = other.takeMutex();
- }
- Query::~Query(void)
- {
- if(m_query)
- {
- delete m_query;
- }
- if(m_mutex)
- {
- m_mutex->unlock();
- }
- }
- QSqlQuery *Query::takeQuery(void)
- {
- auto buf = m_query;
- m_query = NULL;
- return buf;
- }
- QMutex *Query::takeMutex(void)
- {
- auto buf = m_mutex;
- m_mutex = NULL;
- return buf;
- }
- // ConnectNode
- ConnectNode::ConnectNode(const DatabaseSettings &dataBaseSettings, const ConnectSettings &connectSettings):
- m_dataBaseSettings(dataBaseSettings),
- m_connectSettings(connectSettings)
- {
- m_connectionName = QString("%1(%2)").arg(m_dataBaseSettings.connectionName()).arg(QString::number(qint64(QThread::currentThread()), 16));
- m_mutex = new QMutex(QMutex::Recursive);
- if(m_connectSettings.maxOpenTime())
- {
- m_autoClose = new QTimer;
- m_autoClose->setSingleShot(true);
- m_autoClose->setInterval(m_connectSettings.maxOpenTime());
- m_autoClose->moveToThread(qApp->thread());
- m_autoClose->setParent(qApp);
- connect(m_autoClose, SIGNAL(timeout()), this, SLOT(close()), Qt::DirectConnection);
- connect(this, SIGNAL(controlStartAutoClose()), m_autoClose, SLOT(start()));
- connect(this, SIGNAL(controlStopAutoClose()), m_autoClose, SLOT(stop()));
- }
- this->addDataBase();
- }
- ConnectNode::~ConnectNode(void)
- {
- if(m_mutex){ m_mutex->lock(); }
- if(m_autoClose)
- {
- m_autoClose->deleteLater();
- }
- this->removeDataBase();
- if(m_mutex){ m_mutex->unlock(); }
- if(m_mutex){ delete m_mutex; }
- }
- Query ConnectNode::query(void)
- {
- if(!m_database)
- {
- this->addDataBase();
- }
- if(!m_database->isOpen())
- {
- m_database->open();
- }
- if(m_mutex){ m_mutex->lock(); }
- Query buf(*m_database, m_mutex);
- emit controlStartAutoClose();
- return buf;
- }
- bool ConnectNode::addDataBase(void)
- {
- if(m_mutex){ m_mutex->lock(); }
- if(m_database)
- {
- this->removeDataBase();
- }
- m_database = new QSqlDatabase(QSqlDatabase::addDatabase(m_dataBaseSettings.databaseType(), m_connectionName));
- switch(m_dataBaseSettings.databaseMode())
- {
- case DatabaseNameMode:
- {
- m_database->setDatabaseName(m_dataBaseSettings.nameModeName());
- break;
- }
- case DatabaseHostMode:
- {
- m_database->setHostName(m_dataBaseSettings.hostModeHostName());
- m_database->setDatabaseName(m_dataBaseSettings.hostModeDatabaseName());
- m_database->setUserName(m_dataBaseSettings.hostModeUserName());
- m_database->setPassword(m_dataBaseSettings.hostModePassword());
- break;
- }
- default:
- {
- if(m_mutex){ m_mutex->unlock(); }
- return false;
- }
- }
- const auto &&flag = this->open();
- if(m_mutex){ m_mutex->unlock(); }
- return flag;
- }
- void ConnectNode::removeDataBase(void)
- {
- if(m_mutex){ m_mutex->lock(); }
- delete m_database;
- m_database = NULL;
- QSqlDatabase::removeDatabase(m_connectionName);
- if(m_mutex){ m_mutex->unlock(); }
- }
- bool ConnectNode::open(void)
- {
- if(!m_database)
- {
- this->addDataBase();
- }
- if(m_mutex){ m_mutex->lock(); }
- emit controlStartAutoClose();
- const auto &&Flag = m_database->open();
- if(m_mutex){ m_mutex->unlock(); }
- return Flag;
- }
- void ConnectNode::close(void)
- {
- if(m_mutex)
- {
- if(m_mutex->tryLock())
- {
- m_mutex->unlock();
- emit controlStopAutoClose();
- m_database->close();
- }
- else
- {
- emit controlStartAutoClose();
- }
- }
- else
- {
- emit controlStopAutoClose();
- m_database->close();
- }
- }
- // Control
- Control::Control(const DatabaseSettings &databaseSettings, const ConnectSettings &connectSettings):
- m_databaseSettings(databaseSettings),
- m_connectSettings(connectSettings)
- {
- if(m_connectSettings.queryMode() == QueryAutoMode)
- {
- if(databaseSettings.databaseType() == "QMYSQL")
- {
- m_connectSettings.setQueryMode(QueryMultiMode);
- }
- else if(databaseSettings.databaseType() == "QODBC")
- {
- m_connectSettings.setQueryMode(QueryMultiMode);
- }
- else
- {
- m_connectSettings.setQueryMode(QuerySingleMode);
- }
- }
- if(m_connectSettings.queryMode() == QuerySingleMode)
- {
- this->insert(qint64(QThread::currentThread()));
- }
- if(m_connectSettings.minWaitTime() == -1)
- {
- if(databaseSettings.databaseType() == "QMYSQL")
- {
- m_connectSettings.setMinWaitTime(0);
- }
- else if(databaseSettings.databaseType() == "QODBC")
- {
- m_connectSettings.setMinWaitTime(0);
- }
- else
- {
- m_connectSettings.setMinWaitTime(5);
- m_wait = new QTime;
- m_wait->start();
- }
- }
- else
- {
- m_wait = new QTime;
- m_wait->start();
- }
- }
- Control::~Control(void)
- {
- for(auto &now: m_node)
- {
- now->deleteLater();
- }
- if(m_wait)
- {
- delete m_wait;
- }
- }
- void Control::removeAll(void)
- {
- m_mutex.lock();
- for(auto &Now: m_node)
- {
- Now->removeDataBase();
- }
- m_mutex.unlock();
- }
- Query Control::query(void)
- {
- if(m_wait)
- {
- const auto &&flag = m_connectSettings.minWaitTime() - m_wait->elapsed();
- m_wait->restart();
- if(flag > 0)
- {
- QThread::msleep(flag);
- }
- }
- if(m_connectSettings.queryMode() == QueryMultiMode)
- {
- m_mutex.lock();
- const auto &¤tThread = qint64(QThread::currentThread());
- const auto &&now = m_node.find(currentThread);
- if(now != m_node.end())
- {
- auto buf((*now)->query());
- m_mutex.unlock();
- return buf;
- }
- else
- {
- this->insert(qint64(QThread::currentThread()));
- m_mutex.unlock();
- return this->query();
- }
- }
- else
- {
- return (*m_node.begin())->query();
- }
- }
- void Control::insert(const qint64 &key)
- {
- m_node[key] = new ConnectNode(m_databaseSettings, m_connectSettings);
- }
使用:
- // Qt lib import
- #include <QCoreApplication>
- #include <QtConcurrent>
- #include <QSqlError>
- // JasonQt lib import
- #include "JasonQt/JasonQt_Database.h"
- int main(int argc, char *argv[])
- {
- QCoreApplication a(argc, argv);
- /*
- * 注:关于附加参数
- * 这是可以不写的,如果要写的话,可以参考这个:
- *
- * 单次打开数据库最大时间:也就是最大open的时间,对于某些数据库,长时间open但不使用,不仅会造成资源浪费还会意外断开。在设置了60 * 1000后,且60秒内未进行查询,就自动断开。
- * 多线程支持:简单的说就是高级点的数据库,比如 MySql 写 JasonQt_Database::QueryMultiMode ;低级的,比如 Sqlite ,写 JasonQt_Database::QuerySingleMode ,就可以了。
- * 最小等待时间:对于某些数据库,比如Sqlite,密集查询时可能出错,此时可以适当的提升两次查询之间的最小等待时间,比如10ms
- */
- // Sqlite的连接方式 类型 连接名 Sqlite文件路径 单次打开数据库最大时间 多线程支持 最小等待时间
- JasonQt_Database::Control control({ "QSQLITE", "TestDB", "/Users/Jason/test.db" }, { 60 * 1000, JasonQt_Database::QuerySingleMode, 10});
- // MySql的连接方式 类型 连接名 IP 数据库 用户名 密码
- // JasonQt_Database::Control control({ "QMYSQL", "TestDB", "localhost", "JasonDB", "root", "YourPassword" });
- // SqlServer的连接方式 类型 连接名 数据库 数据库名 用户名 密码
- // JasonQt_Database::Control control({ "QODBC", "TestDB", "Driver={SQL SERVER};server=iZ23kn6vmZ\\TEST;database=test;uid=sa;pwd=YourPassword;" });
- auto insert = [&]()
- {
- auto query(control.query()); // 这里的query在解引用( -> 或者 * )后返回的是 QSqlQuery ,直接用就可以了,不需要单独打开数据库或者其他的初始化
- query->prepare("insert into Test1 values(?)"); // 模拟插入操作
- query->addBindValue(rand() % 1280);
- if(!query->exec())
- {
- qDebug() << "Error" << __LINE__;
- }
- query->clear();
- query->prepare("insert into Test2 values(NULL, ?, ?)");
- query->addBindValue(rand() % 1280);
- QString buf;
- for(int now = 0; now < 50; now++)
- {
- buf.append('a' + (rand() % 26));
- }
- query->addBindValue(buf);
- if(!query->exec())
- {
- qDebug() << "Error" << __LINE__;
- }
- };
- auto delete_ = [&]()
- {
- auto query(control.query());
- query->prepare("delete from Test1 where data = ?");
- query->addBindValue(rand() % 1280);
- if(!query->exec())
- {
- qDebug() << "Error" << __LINE__;
- }
- query->clear();
- query->prepare("delete from Test2 where data1 = ?");
- query->addBindValue(rand() % 1280);
- if(!query->exec())
- {
- qDebug() << "Error" << __LINE__;
- }
- };
- auto update = [&]()
- {
- auto query(control.query());
- query->prepare("update Test1 set data = ? where data = ?");
- query->addBindValue(rand() % 1280);
- query->addBindValue(rand() % 1280);
- if(!query->exec())
- {
- qDebug() << "Error" << __LINE__;
- }
- query->clear();
- query->prepare("update Test2 set data1 = ?, data2 = ? where data1 = ?");
- query->addBindValue(rand() % 1280 + 1);
- QString buf;
- for(int now = 0; now < 50; now++)
- {
- buf.append('a' + (rand() % 26));
- }
- query->addBindValue(buf);
- query->addBindValue(rand() % 1280 + 1);
- if(!query->exec())
- {
- qDebug() << "Error" << __LINE__;
- }
- };
- auto select = [&]()
- {
- auto query(control.query());
- query->prepare("select * from Test1 where data = ?");
- query->addBindValue(rand() % 1280);
- if(!query->exec())
- {
- qDebug() << "Error" << __LINE__;
- }
- query->clear();
- query->prepare("select * from Test2 where data1 = ?");
- query->addBindValue(rand() % 1280);
- if(!query->exec())
- {
- qDebug() << "Error" << __LINE__;
- }
- };
- volatile int count = 0, last = 0;
- QTime time;
- time.start();
- QThreadPool::globalInstance()->setMaxThreadCount(10);
- for(int now = 0; now < 3; now++) // 开启3个线程测试
- {
- QtConcurrent::run([&]()
- {
- while(true)
- {
- count++;
- if(!(count % 1000))
- {
- const auto &&now = time.elapsed();
- qDebug() << now - last; // 打印每完成1000语句的时间
- last = now;
- }
- switch(rand() % 20)
- {
- case 0: { insert(); break; }
- case 1: { delete_(); break; }
- case 2: { update(); break; }
- default: { select(); break; }
- }
- }
- QThread::msleep(10);
- });
- }
- return a.exec();
- }
我也写了一个示例工程,可以前往这里下载
http://download.csdn.net/detail/wsj18808050/8566497
http://blog.csdn.net/wsj18808050/article/details/44891715
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