Changeset c790268 for src/orm


Ignore:
Timestamp:
01/17/10 17:22:03 (12 years ago)
Author:
pavelpa <pavelpa@…>
Branches:
master, qt5
Children:
6f39595
Parents:
680a4da
Message:

implemented JOINing two tables

  • modified 'ormrecord' to support JOINing two tables
  • modified 'event' accordingly, since its items/columns are splitted into two separate tables
File:
1 edited

Legend:

Unmodified
Added
Removed
  • src/orm/ormrecord.h

    r680a4da rc790268  
    1010#include <QDebug>
    1111
     12// INFO:
     13// all record items/columns may be defined in one table (1.), or
     14// they can be splitted in two separate tables (2.) (eg. for FTS support)
     15// 1.) you have to define "static QString const sTableName"
     16// 2.) you have to define two table names:
     17//     "static QString const sTable1Name"
     18//     "static QString const sTable2Name"
     19// and since all record items/columns are handled by one QSqlRecord,
     20// you have to also define number of columns that belongs to table 1 (1.), and table 2 (2.)
     21// 1.) "static int const sTable1ColCount"
     22// 2.) "static int const sTable2ColCount"
     23// there are also defined auxiliary methods for 1-Table/2-Tables approach, see bellow
     24
    1225class OrmException
    1326{
     
    4457
    4558    // auxiliary methods
     59    static QSqlRecord toRecord(const QList<QSqlField> & columnList);
     60    // all record items/columns are in one table
    4661    static QString columnsForSelect(const QString& prefix = QString());
    4762    static QString selectQuery();
    4863    static QString updateQuery();
    49     static QSqlRecord toRecord(const QList<QSqlField> & columnList);
     64    // record items/columns are stored in two tables
     65    static QString columnsForSelectJoin2T(); // for joining two tables
     66    static QString selectQueryJoin2T(const QString &key); // for joining two tables
    5067
    5168    static QVariant convertToC(QVariant value, QVariant::Type colType);
     
    150167
    151168template <typename T>
     169QString OrmRecord<T>::columnsForSelectJoin2T()
     170{
     171    Q_ASSERT((T::sTable1ColCount+T::sTable2ColCount) == T::sColumns.count());
     172
     173    QStringList prefixedColumns;
     174    for (int i=0; i<T::sTable1ColCount; i++)
     175    {
     176        prefixedColumns.append(QString("%1.%2").arg(T::sTable1Name, T::sColumns.field(i).name()));
     177    }
     178    for (int j=0; j<T::sTable2ColCount; j++)
     179    {
     180        prefixedColumns.append(QString("%1.%2").arg(T::sTable2Name, T::sColumns.field(T::sTable1ColCount+j).name()));
     181    }
     182    return prefixedColumns.join(",");
     183}
     184
     185template <typename T>
    152186QString OrmRecord<T>::selectQuery()
    153187{
     
    156190
    157191template <typename T>
     192QString OrmRecord<T>::selectQueryJoin2T(const QString &key)
     193{
     194    return QString("SELECT %1 FROM %2 INNER JOIN %3 ON %4.%5 = %6.%7 ").arg(
     195            columnsForSelectJoin2T(),
     196            T::sTable1Name,
     197            T::sTable2Name,
     198            T::sTable1Name,
     199            key,
     200            T::sTable2Name,
     201            key);
     202}
     203
     204template <typename T>
    158205QString OrmRecord<T>::updateQuery()
    159206{
    160     return QString("UPDATE %1 ").arg(T::sTableName);
     207    return QString("UPDATE %1 ").arg(T::sTable1Name);
    161208}
    162209
     
    198245
    199246#endif // ORMRECORD_H
     247
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