+#ifndef ORMRECORD_H
+#define ORMRECORD_H
+
+#include <QSqlQuery>
#include <QSqlRecord>
#include <QSqlField>
+#include <QSqlError>
+#include <QStringList>
+#include <QDateTime>
+#include <QDebug>
+
+// INFO:
+// all record items/columns may be defined in one table (1.), or
+// they can be splitted in two separate tables (2.) (eg. for FTS support)
+// 1.) you have to define "static QString const sTableName"
+// 2.) you have to define two table names:
+// "static QString const sTable1Name"
+// "static QString const sTable2Name"
+// and since all record items/columns are handled by one QSqlRecord,
+// you have to also define number of columns that belongs to table 1 (1.), and table 2 (2.)
+// 1.) "static int const sTable1ColCount"
+// 2.) "static int const sTable2ColCount"
+// there are also defined auxiliary methods for 1-Table/2-Tables approach, see bellow
+
+class OrmException
+{
+};
+
+class OrmNoObjectException : OrmException
+{
+};
+
+class OrmSqlException : OrmException
+{
+public:
+ OrmSqlException(const QString& text) : mText(text) {}
+ QString text() const { return mText; }
+
+private:
+ QString mText;
+};
template <typename T>
class OrmRecord : protected QSqlRecord
{
public:
- static QString colName(int col);
+ OrmRecord();
+ static T hydrate(const QSqlRecord& record);
+ void update(QString col, QVariant value = QVariant()); // updates specified column 'col'
protected:
- QVariant value(int col) const;
- void setValue(int col, QVariant value);
+ QVariant value(QString col) const;
+ void setValue(QString col, QVariant value);
+
+ static T loadOne(QSqlQuery query);
+ static QList<T> load(QSqlQuery query);
+
+ // auxiliary methods
+ static QSqlRecord toRecord(const QList<QSqlField> & columnList);
+ // all record items/columns are in one table
+ static QString columnsForSelect(const QString& prefix = QString());
+ static QString selectQuery();
+ static QString updateQuery();
+ // record items/columns are stored in two tables
+ static QString columnsForSelectJoin2T(); // for joining two tables
+ static QString selectQueryJoin2T(const QString &key); // for joining two tables
+
+ static QVariant convertToC(QVariant value, QVariant::Type colType);
+ static QVariant convertToDb(QVariant value, QVariant::Type colType);
};
template <typename T>
-QString OrmRecord<T>::colName(int col)
+OrmRecord<T>::OrmRecord()
+{
+ QSqlRecord::operator=(T::sColumns);
+}
+
+template <typename T>
+T OrmRecord<T>::hydrate(const QSqlRecord& record)
+{
+ T object;
+ object.QSqlRecord::operator=(record);
+ return object;
+}
+
+// updates specified column 'col'
+// if the value is not specified as an argument,
+// it's taken from the reford itself
+// see also: setValue() method for more details
+template <typename T>
+void OrmRecord<T>::update(QString col, QVariant value)
{
- return T::sColNames.at(col);
+ QSqlQuery query;
+ query.prepare(QString(updateQuery() + "SET %1 = :col WHERE id = :id").arg(col));
+ if(value.isValid()) // take 'col' value from the method's arguments
+ query.bindValue(":col", value);
+ else // take 'col' value from the record; see setValue()
+ query.bindValue(":col", convertToDb(this->value(col), this->value(col).type()));
+ query.bindValue(":id", this->value("id"));
+ //query.bindValue(":id", convertToDb(value("id"), QVariant::Int));
+ query.exec();
}
template <typename T>
-QVariant OrmRecord<T>::value(int col) const
+QVariant OrmRecord<T>::value(QString col) const
{
- Q_ASSERT(col >= 0 && col < T::sColNames.count());
+ return convertToC(QSqlRecord::value(col), T::sColumns.field(col).type());
+}
- return QSqlRecord::value(T::sColNames.at(col));
+template <typename T>
+void OrmRecord<T>::setValue(QString col, QVariant value)
+{
+ QSqlRecord::setValue(col, convertToDb(value, T::sColumns.field(col).type()));
}
template <typename T>
-void OrmRecord<T>::setValue(int col, QVariant value)
+T OrmRecord<T>::loadOne(QSqlQuery query)
{
- Q_ASSERT(col >= 0 && col < T::sColNames.count());
+ if (!query.isActive())
+ {
+ if (!query.exec())
+ {
+ throw OrmSqlException(query.lastError().text());
+ }
+ }
+
+ if (!query.next())
+ {
+ throw OrmNoObjectException();
+ }
+
+ return hydrate(query.record());
+}
- QString fieldName = T::sColNames.at(col);
+template <typename T>
+QList<T> OrmRecord<T>::load(QSqlQuery query)
+{
+ if (!query.isActive())
+ {
+ if (!query.exec())
+ {
+ qDebug() << "Error: " << query.lastError().driverText() << "; Type: " << query.lastError().type();
+ throw OrmSqlException(query.lastError().text());
+ }
+ else
+ {
+ qDebug() << "SQL OK";
+ }
+ }
- if (!contains(fieldName))
+ QList<T> objects;
+ while (query.next())
{
- append(QSqlField(fieldName, value.type()));
+ objects << hydrate(query.record());
}
+ qDebug() << "Fetch done";
+ return objects;
+}
- QSqlRecord::setValue(fieldName, value);
+template <typename T>
+QString OrmRecord<T>::columnsForSelect(const QString& prefix)
+{
+ QStringList prefixedColumns;
+ for (int i=0; i<T::sColumns.count(); i++)
+ {
+ prefixedColumns.append(prefix.isEmpty() ?
+ T::sColumns.field(i).name() :
+ QString("%1.%2").arg(prefix, T::sColumns.field(i).name()));
+ }
+ return prefixedColumns.join(",");
}
+
+template <typename T>
+QString OrmRecord<T>::columnsForSelectJoin2T()
+{
+ Q_ASSERT((T::sTable1ColCount+T::sTable2ColCount) == T::sColumns.count());
+
+ QStringList prefixedColumns;
+ for (int i=0; i<T::sTable1ColCount; i++)
+ {
+ prefixedColumns.append(QString("%1.%2").arg(T::sTable1Name, T::sColumns.field(i).name()));
+ }
+ for (int j=0; j<T::sTable2ColCount; j++)
+ {
+ prefixedColumns.append(QString("%1.%2").arg(T::sTable2Name, T::sColumns.field(T::sTable1ColCount+j).name()));
+ }
+ return prefixedColumns.join(",");
+}
+
+template <typename T>
+QString OrmRecord<T>::selectQuery()
+{
+ return QString("SELECT %1 FROM %2 ").arg(columnsForSelect(), T::sTableName);
+}
+
+
+template <typename T>
+QString OrmRecord<T>::selectQueryJoin2T(const QString &key)
+{
+ return QString("SELECT %1 FROM %2 INNER JOIN %3 ON %4.%5 = %6.%7 ").arg(
+ columnsForSelectJoin2T(),
+ T::sTable1Name,
+ T::sTable2Name,
+ T::sTable1Name,
+ key,
+ T::sTable2Name,
+ key);
+}
+
+template <typename T>
+QString OrmRecord<T>::updateQuery()
+{
+ return QString("UPDATE %1 ").arg(T::sTable1Name);
+}
+
+template <typename T>
+QSqlRecord OrmRecord<T>::toRecord(const QList<QSqlField> & columnList)
+{
+ QSqlRecord record;
+ foreach (const QSqlField & col, columnList)
+ {
+ record.append(col);
+ }
+ return record;
+}
+
+template <typename T>
+QVariant OrmRecord<T>::convertToC(QVariant value, QVariant::Type colType)
+{
+ if (colType == QVariant::DateTime && value.canConvert<uint>())
+ {
+ QDateTime date;
+ date.setTimeSpec(Qt::UTC);
+ date.setTime_t(value.toUInt());
+ return date;
+ }
+
+ return value;
+}
+
+template <typename T>
+QVariant OrmRecord<T>::convertToDb(QVariant value, QVariant::Type colType)
+{
+ if (colType == QVariant::DateTime && value.canConvert<QDateTime>())
+ {
+ return value.toDateTime().toTime_t();
+ }
+
+ return value;
+}
+
+#endif // ORMRECORD_H
+
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