sqlconversationmodel.cpp Example File

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#include "sqlconversationmodel.h" #include <QDateTime> #include <QDebug> #include <QSqlError> #include <QSqlRecord> #include <QSqlQuery> static const char *conversationsTableName = "Conversations"; static void createTable() { if (QSqlDatabase::database().tables().contains(conversationsTableName)) { // The table already exists; we don't need to do anything. return; } QSqlQuery query; if (!query.exec( "CREATE TABLE IF NOT EXISTS 'Conversations' (" "'author' TEXT NOT NULL," "'recipient' TEXT NOT NULL," "'timestamp' TEXT NOT NULL," "'message' TEXT NOT NULL," "FOREIGN KEY('author') REFERENCES Contacts ( name )," "FOREIGN KEY('recipient') REFERENCES Contacts ( name )" ")")) { qFatal("Failed to query database: %s", qPrintable(query.lastError().text())); } query.exec("INSERT INTO Conversations VALUES('Me', 'Ernest Hemingway', '2016-01-07T14:36:06', 'Hello!')"); query.exec("INSERT INTO Conversations VALUES('Ernest Hemingway', 'Me', '2016-01-07T14:36:16', 'Good afternoon.')"); query.exec("INSERT INTO Conversations VALUES('Me', 'Albert Einstein', '2016-01-01T11:24:53', 'Hi!')"); query.exec("INSERT INTO Conversations VALUES('Albert Einstein', 'Me', '2016-01-07T14:36:16', 'Good morning.')"); query.exec("INSERT INTO Conversations VALUES('Hans Gude', 'Me', '2015-11-20T06:30:02', 'God morgen. Har du fått mitt maleri?')"); query.exec("INSERT INTO Conversations VALUES('Me', 'Hans Gude', '2015-11-20T08:21:03', 'God morgen, Hans. Ja, det er veldig fint. Tusen takk! " "Hvor mange timer har du brukt på den?')"); } SqlConversationModel::SqlConversationModel(QObject *parent) : QSqlTableModel(parent) { createTable(); setTable(conversationsTableName); setSort(2, Qt::DescendingOrder); // Ensures that the model is sorted correctly after submitting a new row. setEditStrategy(QSqlTableModel::OnManualSubmit); } QString SqlConversationModel::recipient() const { return m_recipient; } void SqlConversationModel::setRecipient(const QString &recipient) { if (recipient == m_recipient) return; m_recipient = recipient; const QString filterString = QString::fromLatin1( "(recipient = '%1' AND author = 'Me') OR (recipient = 'Me' AND author='%1')").arg(m_recipient); setFilter(filterString); select(); emit recipientChanged(); } QVariant SqlConversationModel::data(const QModelIndex &index, int role) const { if (role < Qt::UserRole) return QSqlTableModel::data(index, role); const QSqlRecord sqlRecord = record(index.row()); return sqlRecord.value(role - Qt::UserRole); } QHash<int, QByteArray> SqlConversationModel::roleNames() const { QHash<int, QByteArray> names; names[Qt::UserRole] = "author"; names[Qt::UserRole + 1] = "recipient"; names[Qt::UserRole + 2] = "timestamp"; names[Qt::UserRole + 3] = "message"; return names; } void SqlConversationModel::sendMessage(const QString &recipient, const QString &message) { const QString timestamp = QDateTime::currentDateTime().toString(Qt::ISODate); QSqlRecord newRecord = record(); newRecord.setValue("author", "Me"); newRecord.setValue("recipient", recipient); newRecord.setValue("timestamp", timestamp); newRecord.setValue("message", message); if (!insertRecord(rowCount(), newRecord)) { qWarning() << "Failed to send message:" << lastError().text(); return; } submitAll(); }

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