Changeset c790268

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

Location:

src

Files:

• mvc/delegate.cpp (modified) (1 diff)
• mvc/event.cpp (modified) (3 diffs)
• mvc/event.h (modified) (4 diffs)
• orm/ormrecord.h (modified) (5 diffs)

src/mvc/delegate.cpp

@@ -137 +137 @@
 
     // draw title
-    QPointF titlePointF(option.rect.x(),option.rect.y()+option.rect.height()-10);
-    QString text = qVariantValue<QString>(index.data());
+    QPointF titlePointF(option.rect.x()+SPACER,option.rect.y()+option.rect.height()-10);
+    QString text;
+    if(index.parent().isValid()) // event
+        text = qVariantValue<QString>(index.data()) + ": " + static_cast<Event*>(index.internalPointer())->title();
+    else // group
+        text = qVariantValue<QString>(index.data());
     painter->drawText(titlePointF,text);
 

src/mvc/event.cpp

@@ -1 +1 @@
 #include "event.h"
 
+// 'event' record is splitted into two separate tables 'event' and 'virtual_event'
+// for the FTS (Full-Text-Search) support and so, it is necessary to provide/use
+// two table names + corresponding parameters/methods, see bellow
+QString const Event::sTable1Name = QString("event");
+QString const Event::sTable2Name = QString("virtual_event");
+int const Event::sTable1ColCount = 8; // see 'toRecord()' for more details
+int const Event::sTable2ColCount = 5; // see 'toRecord()' for more details
+
 QSqlRecord const Event::sColumns = Event::toRecord(QList<QSqlField>()
+    /* 'columns from Table 1 */
     << QSqlField("id", QVariant::Int)
     << QSqlField("xid_conference", QVariant::Int)
@@ -9 +18 @@
     << QSqlField("type", QVariant::String)
     << QSqlField("language", QVariant::String)
-    << QSqlField("favourite", QVariant::Bool));
+    << QSqlField("favourite", QVariant::Bool)
+    /* 'columns' from Table2 */
+    << QSqlField("tag", QVariant::String)
+    << QSqlField("title", QVariant::String)
+    << QSqlField("subtitle", QVariant::String)
+    << QSqlField("abstract", QVariant::String)
+    << QSqlField("description", QVariant::String));
 
-QString const Event::sTableName = QString("event");
 
 Event Event::getById(int id, int conferenceId)
 {
     QSqlQuery query;
-    query.prepare(selectQuery() + "WHERE id = :id AND xid_conference = :conf");
+    query.prepare(selectQueryJoin2T("id") + "WHERE event.id = :id AND event.xid_conference = :conf");
     query.bindValue(":id", id);
     query.bindValue(":conf", conferenceId);
+
     return loadOne(query);
 }
@@ -25 +40 @@
 {
     QSqlQuery query;
-    query.prepare(selectQuery() + "WHERE xid_conference = :conf AND start >= :start AND start < :end ORDER BY start");
+    query.prepare(selectQueryJoin2T("id") + "WHERE event.xid_conference = :conf AND event.start >= :start AND event.start < :end ORDER BY event.start");
     query.bindValue(":conf", conferenceId);
     query.bindValue(":start", convertToDb(date, QVariant::DateTime));

src/mvc/event.h

@@ -19 +19 @@
 public:
     static QSqlRecord const sColumns;
-    static QString const sTableName;
+    //static QString const sTableName;
+    static QString const sTable1Name;
+    static QString const sTable2Name;
+    static int const sTable1ColCount;
+    static int const sTable2ColCount;
 
 public:
@@ -26 +30 @@
 
 public:
+    // Table 1
     int id() const { return value("id").toInt(); }
     int conferenceId() const { return value("xid_conference").toInt(); }
@@ -34 +39 @@
     QString language() const { return value("language").toString(); }
     bool isFavourite() const { return value("favourite").toBool(); }
+    // Table 2 : virtual table for FTS (Full Text Search)
+    QString tag() const { return value("tag").toString(); }
+    QString title() const { return value("title").toString(); }
+    QString subtitle() const { return value("subtitle").toString(); }
+    QString abstract() const { return value("abstract").toString(); }
+    QString description() const { return value("description").toString(); }
 
+    // Table 1
     void setId(int id) { setValue("id", id); }
     void setConferenceId(int conferenceId) { setValue("xid_conference", conferenceId); }
@@ -43 +55 @@
     void setLanguage(const QString& language) { setValue("language", language); }
     void setFavourite(bool favourite) { setValue("favourite", favourite); }
+    // Table 2 : virtual table for FTS (Full Text Search)
+    void setTag(const QString& tag) { setValue("tag", tag); }
+    void setTitle(const QString& title) { setValue("title", title); }
+    void setSubtitle(const QString& subtitle) { setValue("subtitle", subtitle); }
+    void setAbstract(const QString& abstract) { setValue("abstract", abstract); }
+    void setDescription(const QString& description) { setValue("description", description); }
 
 friend class EventTest;

src/orm/ormrecord.h

@@ -10 +10 @@
 #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
 {
@@ -44 +57 @@
 
     // 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();
-    static QSqlRecord toRecord(const QList<QSqlField> & columnList);
+    // 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);
@@ -150 +167 @@
 
 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()
 {
@@ -156 +190 @@
 
 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::sTableName);
+    return QString("UPDATE %1 ").arg(T::sTable1Name);
 }
 
@@ -198 +245 @@
 
 #endif // ORMRECORD_H
+