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DataBaseInterface/databaselms.cpp

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+#include "databaselms.h"
+
+#include <QtSql>
+#include <QSqlDatabase>
+#include <QSqlDriver>
+#include <QDomDocument>
+#include <QProcess>
+
+const QString DataBaseLMS::TypeUserDBInstructor = "instructor";
+const QString DataBaseLMS::TypeUserDBTrainee = "trainee";
+
+DataBaseLMS::DataBaseLMS(QWidget *ownerWidget, QObject *parent):
+    QObject(parent),
+    db(nullptr),
+    UserNamePostgres(""),
+    PasswordPostgres(""),
+    ownerWidget(ownerWidget)
+{
+
+}
+
+DataBaseLMS::~DataBaseLMS()
+{
+    deleteConnection();
+}
+
+void DataBaseLMS::slot_LanguageChanged(QString language)
+{
+    qtLanguageTranslator.load(QString(QStringLiteral("translations/DataBaseLMS_")) + language, QStringLiteral("."));
+    QCoreApplication::installTranslator(&qtLanguageTranslator);
+}
+
+bool DataBaseLMS::createConnection()
+{
+    dbSettings = getDataBaseSettings();
+
+    dbSettings.connectionName = "Connection_" + dbSettings.dbName;
+
+    db = new QSqlDatabase(QSqlDatabase::addDatabase(dbSettings.dbType, dbSettings.connectionName));
+
+    db->setDatabaseName(dbSettings.dbName);
+    db->setUserName(dbSettings.dbUserName);
+    db->setPassword(dbSettings.dbPassword);
+    db->setHostName(dbSettings.dbHostName);
+    db->setPort(dbSettings.dbPort);
+
+    bool res = db->open();
+
+    if(!res)
+    {
+        deleteConnection();
+        return false;
+    }
+    else
+    {
+        bool flHas = db->driver()->hasFeature(QSqlDriver::Transactions);
+        qDebug() << "db->driver()->hasFeature(QSqlDriver::Transactions): " << flHas;
+        return true;
+    }
+}
+
+void DataBaseLMS::deleteConnection()
+{
+    if(db != nullptr)
+    {
+        if(db->isOpen())
+            db->close();
+
+        delete  db;
+        db = nullptr;
+    }
+}
+
+bool DataBaseLMS::isConnected()
+{
+    if(db == nullptr)
+    {
+        return false;
+    }
+    else
+    {
+        if(db->isOpen())
+        {
+            return true;
+        }
+    }
+    return false;
+}
+
+DataBaseSettings DataBaseLMS::getDataBaseSettings()
+{
+    DataBaseSettings settings;
+    QFile file("config/settings.xml");
+    if(!file.open(QIODevice::ReadOnly))
+        return settings;
+
+    QXmlStreamReader xmlReader(&file);
+
+    while (!xmlReader.atEnd()){
+
+        if(xmlReader.isStartElement()){
+
+            if(xmlReader.name() == "DataBaseSettings")
+            {
+
+                foreach(const QXmlStreamAttribute &attr, xmlReader.attributes())
+                {
+                    QString name = attr.name().toString();
+                    QString value = attr.value().toString();
+
+                    if(name == "Type"){
+                        settings.dbType = value;
+                    }
+
+                    if(name == "Name"){
+                        settings.dbName = value;
+                    }
+
+                    if(name == "UserName"){
+                        settings.dbUserName = value;
+                    }
+
+                    if(name == "Password"){
+                        settings.dbPassword = value;
+                    }
+
+                    if(name == "HostName"){
+                        settings.dbHostName = value;
+                    }
+
+                    if(name == "Port"){
+                        settings.dbPort = value.toInt();
+                    }
+
+                }
+            }
+        }
+
+        xmlReader.readNext();
+    }
+
+    file.close();
+    return settings;
+}
+
+int DataBaseLMS::queryExecInt(QString queryStr)
+{
+    QSqlQuery query = QSqlQuery(*db);
+
+    if(queryExec(queryStr, &query))
+    {
+        if(query.first())
+            return query.value(0).toInt();
+    }
+
+    return 0;
+}
+
+QString DataBaseLMS::queryExecString(QString queryStr)
+{
+    QSqlQuery query = QSqlQuery(*db);
+
+    if(queryExec(queryStr, &query))
+    {
+        if(query.first())
+            return query.value(0).toString();
+    }
+
+    return QStringLiteral("");
+}
+
+bool DataBaseLMS::queryExecBool(QString queryStr)
+{
+    QSqlQuery query = QSqlQuery(*db);
+
+    if(queryExec(queryStr, &query))
+    {
+        if(query.first())
+            return query.value(0).toBool();
+    }
+
+    return false;
+}
+
+bool DataBaseLMS::queryExec(QString queryStr, QSqlQuery *query)
+{
+    bool res  = false;
+    if(! (res = query->exec(queryStr)) )
+            messageWarningErrorQuery(queryStr, query);
+    return res;
+}
+
+void DataBaseLMS::messageWarningErrorQuery(QString queryStr, QSqlQuery* query)
+{
+    //Запись в файл ошибок БД
+    QDomDocument commonDOM;
+
+    QFile blankFile(":/resources/blankXML/ErrorDB.xml");
+
+    if (! blankFile.open(QFile::ReadOnly | QFile::Text))
+        qDebug() << QString("messageWarningErrorQuery: Couldn't read the file: ") + ":/resources/blankXML/ErrorDB.xml";
+    else
+    {
+        commonDOM.setContent(blankFile.readAll());
+        blankFile.close();
+
+        QDomNode errorDBNode = commonDOM.namedItem("ErrorDB");
+
+        QDomNode errorQueryNode = commonDOM.createElement("ErrorQuery");
+        errorDBNode.appendChild(errorQueryNode);
+        errorQueryNode.toElement().setAttribute("text", query->lastError().text());
+
+        QDomNode stringOfQueryNode = commonDOM.createElement("StringOfQuery");
+        errorDBNode.appendChild(stringOfQueryNode);
+        stringOfQueryNode.toElement().setAttribute("text", queryStr);
+
+        QDomNode executedQueryNode = commonDOM.createElement("ExecutedQuery");
+        errorDBNode.appendChild(executedQueryNode);
+        executedQueryNode.toElement().setAttribute("text", query->executedQuery());
+
+        QFile xmlOutFile("ErrorDB.xml");
+        if (!xmlOutFile.open(QFile::WriteOnly | QFile::Text))
+            qDebug() << QString("messageWarningErrorQuery: Failed to write a file: ") + "ErrorDB.xml";
+        else
+        {
+            QTextStream outFile(&xmlOutFile);
+            commonDOM.save(outFile, 4);
+            xmlOutFile.close();
+        }
+    }
+
+    //Сообщение об ошибке
+    QString textError = "";
+    textError = "Error query:\n" + query->lastError().text() + "\n" +
+                "String of query:\n" + queryStr + "\n" +
+                "Executed query:\n" + query->executedQuery();
+    emit signal_ErrorPostgreSQL(textError);
+}