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Branched from the monolithic repo, Qt master branch, at commit
896db169ea224deb96c59ce8af800d019de63f12

1 files changed, 559 insertions, 0 deletions

diff --git a/doc/src/snippets/sqldatabase/sqldatabase.cpp b/doc/src/snippets/sqldatabase/sqldatabase.cpp
new file mode 100644
index 0000000000..4f428c7f5b
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+/****************************************************************************
+**
+** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the documentation of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:BSD$
+** You may use this file under the terms of the BSD license as follows:
+**
+** "Redistribution and use in source and binary forms, with or without
+** modification, are permitted provided that the following conditions are
+** met:
+**   * Redistributions of source code must retain the above copyright
+**     notice, this list of conditions and the following disclaimer.
+**   * Redistributions in binary form must reproduce the above copyright
+**     notice, this list of conditions and the following disclaimer in
+**     the documentation and/or other materials provided with the
+**     distribution.
+**   * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor
+**     the names of its contributors may be used to endorse or promote
+**     products derived from this software without specific prior written
+**     permission.
+**
+** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include <QtGui>
+#include <QtSql>
+
+#include <iostream>
+
+using namespace std;
+
+QString tr(const char *text)
+{
+    return QApplication::translate(text, text);
+}
+
+void QSqlDatabase_snippets()
+{
+    {
+//! [0]
+    QSqlDatabase db = QSqlDatabase::addDatabase("QPSQL");
+    db.setHostName("acidalia");
+    db.setDatabaseName("customdb");
+    db.setUserName("mojito");
+    db.setPassword("J0a1m8");
+    bool ok = db.open();
+//! [0]
+    Q_UNUSED(ok);
+    }
+
+    {
+//! [1]
+    QSqlDatabase db = QSqlDatabase::database();
+//! [1]
+    }
+}
+
+void QSqlField_snippets()
+{
+#if 0
+    {
+//! [2]
+    QSqlField field("age", QVariant::Int);
+    field.setValue(QPixmap());  // WRONG
+//! [2]
+    }
+#endif
+
+    {
+//! [3]
+    QSqlField field("age", QVariant::Int);
+    field.setValue(QString("123"));  // casts QString to int
+//! [3]
+    }
+
+    {
+//! [4]
+    QSqlQuery query;
+//! [4] //! [5]
+    QSqlRecord record = query.record();
+//! [5] //! [6]
+    QSqlField field = record.field("country");
+//! [6]
+    }
+}
+
+void doSomething(const QString &)
+{
+}
+
+void QSqlQuery_snippets()
+{
+    {
+    // typical loop
+//! [7]
+    QSqlQuery query("SELECT country FROM artist");
+    while (query.next()) {
+        QString country = query.value(0).toString();
+        doSomething(country);
+    }
+//! [7]
+    }
+
+    {
+    // field index lookup
+//! [8]
+    QSqlQuery query("SELECT * FROM artist");
+    int fieldNo = query.record().indexOf("country");
+    while (query.next()) {
+        QString country = query.value(fieldNo).toString();
+        doSomething(country);
+    }
+//! [8]
+    }
+
+    {
+    // named with named
+//! [9]
+    QSqlQuery query;
+    query.prepare("INSERT INTO person (id, forename, surname) "
+                  "VALUES (:id, :forename, :surname)");
+    query.bindValue(":id", 1001);
+    query.bindValue(":forename", "Bart");
+    query.bindValue(":surname", "Simpson");
+    query.exec();
+//! [9]
+    }
+
+    {
+    // positional with named
+//! [10]
+    QSqlQuery query;
+    query.prepare("INSERT INTO person (id, forename, surname) "
+                  "VALUES (:id, :forename, :surname)");
+    query.bindValue(0, 1001);
+    query.bindValue(1, "Bart");
+    query.bindValue(2, "Simpson");
+    query.exec();
+//! [10]
+    }
+
+    {
+    // positional 1
+//! [11]
+    QSqlQuery query;
+    query.prepare("INSERT INTO person (id, forename, surname) "
+                  "VALUES (?, ?, ?)");
+    query.bindValue(0, 1001);
+    query.bindValue(1, "Bart");
+    query.bindValue(2, "Simpson");
+    query.exec();
+//! [11]
+    }
+
+    {
+    // positional 2
+//! [12]
+    QSqlQuery query;
+    query.prepare("INSERT INTO person (id, forename, surname) "
+                  "VALUES (?, ?, ?)");
+    query.addBindValue(1001);
+    query.addBindValue("Bart");
+    query.addBindValue("Simpson");
+    query.exec();
+//! [12]
+    }
+
+    {
+    // stored
+//! [13]
+    QSqlQuery query;
+    query.prepare("CALL AsciiToInt(?, ?)");
+    query.bindValue(0, "A");
+    query.bindValue(1, 0, QSql::Out);
+    query.exec();
+    int i = query.boundValue(1).toInt(); // i is 65
+//! [13]
+    Q_UNUSED(i);
+    }
+
+    QSqlQuery query;
+
+    {
+    // examine with named binding
+//! [14]
+    QMapIterator<QString, QVariant> i(query.boundValues());
+    while (i.hasNext()) {
+        i.next();
+        cout << i.key().toAscii().data() << ": "
+             << i.value().toString().toAscii().data() << endl;
+    }
+//! [14]
+    }
+
+    {
+    // examine with positional binding
+//! [15]
+    QList<QVariant> list = query.boundValues().values();
+    for (int i = 0; i < list.size(); ++i)
+        cout << i << ": " << list.at(i).toString().toAscii().data() << endl;
+//! [15]
+    }
+}
+
+void QSqlQueryModel_snippets()
+{
+    {
+//! [16]
+    QSqlQueryModel *model = new QSqlQueryModel;
+    model->setQuery("SELECT name, salary FROM employee");
+    model->setHeaderData(0, Qt::Horizontal, tr("Name"));
+    model->setHeaderData(1, Qt::Horizontal, tr("Salary"));
+
+//! [17]
+    QTableView *view = new QTableView;
+//! [17] //! [18]
+    view->setModel(model);
+//! [18] //! [19]
+    view->show();
+//! [16] //! [19] //! [20]
+    view->setEditTriggers(QAbstractItemView::NoEditTriggers);
+//! [20]
+    }
+
+//! [21]
+    QSqlQueryModel model;
+    model.setQuery("SELECT * FROM employee");
+    int salary = model.record(4).value("salary").toInt();
+//! [21]
+    Q_UNUSED(salary);
+
+    {
+//! [22]
+    int salary = model.data(model.index(4, 2)).toInt();
+//! [22]
+    Q_UNUSED(salary);
+    }
+
+    for (int row = 0; row < model.rowCount(); ++row) {
+        for (int col = 0; col < model.columnCount(); ++col) {
+            qDebug() << model.data(model.index(row, col));
+        }
+    }
+}
+
+class MyModel : public QSqlQueryModel
+{
+public:
+    QVariant data(const QModelIndex &item, int role) const;
+
+    int m_specialColumnNo;
+};
+
+//! [23]
+QVariant MyModel::data(const QModelIndex &item, int role) const
+{
+    if (item.column() == m_specialColumnNo) {
+        // handle column separately
+    }
+    return QSqlQueryModel::data(item, role);
+}
+//! [23]
+
+void QSqlTableModel_snippets()
+{
+//! [24]
+    QSqlTableModel *model = new QSqlTableModel(parentObject, database);
+    model->setTable("employee");
+    model->setEditStrategy(QSqlTableModel::OnManualSubmit);
+    model->select();
+    model->removeColumn(0); // don't show the ID
+    model->setHeaderData(0, Qt::Horizontal, tr("Name"));
+    model->setHeaderData(1, Qt::Horizontal, tr("Salary"));
+
+    QTableView *view = new QTableView;
+    view->setModel(model);
+    view->show();
+//! [24]
+
+    {
+//! [25]
+    QSqlTableModel model;
+    model.setTable("employee");
+    QString name = model.record(4).value("name").toString();
+//! [25]
+    }
+}
+
+void sql_intro_snippets()
+{
+    {
+//! [26]
+    QSqlDatabase db = QSqlDatabase::addDatabase("QMYSQL");
+    db.setHostName("bigblue");
+    db.setDatabaseName("flightdb");
+    db.setUserName("acarlson");
+    db.setPassword("1uTbSbAs");
+    bool ok = db.open();
+//! [26]
+    Q_UNUSED(ok);
+    }
+
+    {
+//! [27]
+    QSqlDatabase firstDB = QSqlDatabase::addDatabase("QMYSQL", "first");
+    QSqlDatabase secondDB = QSqlDatabase::addDatabase("QMYSQL", "second");
+//! [27]
+    }
+
+    {
+//! [28]
+    QSqlDatabase defaultDB = QSqlDatabase::database();
+//! [28] //! [29]
+    QSqlDatabase firstDB = QSqlDatabase::database("first");
+//! [29] //! [30]
+    QSqlDatabase secondDB = QSqlDatabase::database("second");
+//! [30]
+    }
+
+    {
+    // SELECT1
+//! [31]
+    QSqlQuery query;
+    query.exec("SELECT name, salary FROM employee WHERE salary > 50000");
+//! [31]
+
+//! [32]
+    while (query.next()) {
+        QString name = query.value(0).toString();
+        int salary = query.value(1).toInt();
+        qDebug() << name << salary;
+    }
+//! [32]
+    }
+
+    {
+    // FEATURE
+//! [33]
+    QSqlQuery query;
+    int numRows;
+    query.exec("SELECT name, salary FROM employee WHERE salary > 50000");
+
+    QSqlDatabase defaultDB = QSqlDatabase::database();
+    if (defaultDB.driver()->hasFeature(QSqlDriver::QuerySize)) {
+        numRows = query.size();
+    } else {
+        // this can be very slow
+        query.last();
+        numRows = query.at() + 1;
+    }
+//! [33]
+    }
+
+    {
+    // INSERT1
+//! [34]
+    QSqlQuery query;
+    query.exec("INSERT INTO employee (id, name, salary) "
+               "VALUES (1001, 'Thad Beaumont', 65000)");
+//! [34]
+    }
+
+    {
+    // NAMED BINDING
+//! [35]
+    QSqlQuery query;
+    query.prepare("INSERT INTO employee (id, name, salary) "
+                  "VALUES (:id, :name, :salary)");
+    query.bindValue(":id", 1001);
+    query.bindValue(":name", "Thad Beaumont");
+    query.bindValue(":salary", 65000);
+    query.exec();
+//! [35]
+    }
+
+    {
+    // POSITIONAL BINDING
+//! [36]
+    QSqlQuery query;
+    query.prepare("INSERT INTO employee (id, name, salary) "
+                  "VALUES (?, ?, ?)");
+    query.addBindValue(1001);
+    query.addBindValue("Thad Beaumont");
+    query.addBindValue(65000);
+    query.exec();
+//! [36]
+    }
+
+    {
+    // UPDATE1
+//! [37]
+    QSqlQuery query;
+    query.exec("UPDATE employee SET salary = 70000 WHERE id = 1003");
+//! [37]
+    }
+
+    {
+    // DELETE1
+//! [38]
+    QSqlQuery query;
+    query.exec("DELETE FROM employee WHERE id = 1007");
+//! [38]
+    }
+
+    {
+    // TRANSACTION
+//! [39]
+    QSqlDatabase::database().transaction();
+    QSqlQuery query;
+    query.exec("SELECT id FROM employee WHERE name = 'Torild Halvorsen'");
+    if (query.next()) {
+        int employeeId = query.value(0).toInt();
+        query.exec("INSERT INTO project (id, name, ownerid) "
+                   "VALUES (201, 'Manhattan Project', "
+                   + QString::number(employeeId) + ')');
+    }
+    QSqlDatabase::database().commit();
+//! [39]
+    }
+
+    {
+    // SQLQUERYMODEL1
+//! [40]
+    QSqlQueryModel model;
+    model.setQuery("SELECT * FROM employee");
+
+    for (int i = 0; i < model.rowCount(); ++i) {
+        int id = model.record(i).value("id").toInt();
+        QString name = model.record(i).value("name").toString();
+        qDebug() << id << name;
+    }
+//! [40]
+    }
+
+    {
+    // SQLTABLEMODEL1
+//! [41]
+    QSqlTableModel model;
+    model.setTable("employee");
+    model.setFilter("salary > 50000");
+    model.setSort(2, Qt::DescendingOrder);
+    model.select();
+
+    for (int i = 0; i < model.rowCount(); ++i) {
+        QString name = model.record(i).value("name").toString();
+        int salary = model.record(i).value("salary").toInt();
+        qDebug() << name << salary;
+    }
+//! [41]
+    }
+
+    {
+    // SQLTABLEMODEL2
+    QSqlTableModel model;
+    model.setTable("employee");
+
+//! [42]
+    for (int i = 0; i < model.rowCount(); ++i) {
+        QSqlRecord record = model.record(i);
+        double salary = record.value("salary").toInt();
+        salary *= 1.1;
+        record.setValue("salary", salary);
+        model.setRecord(i, record);
+    }
+    model.submitAll();
+//! [42]
+
+    // SQLTABLEMODEL3
+    int row = 1;
+    int column = 2;
+//! [43]
+    model.setData(model.index(row, column), 75000);
+    model.submitAll();
+//! [43]
+
+    // SQLTABLEMODEL4
+//! [44]
+    model.insertRows(row, 1);
+    model.setData(model.index(row, 0), 1013);
+    model.setData(model.index(row, 1), "Peter Gordon");
+    model.setData(model.index(row, 2), 68500);
+    model.submitAll();
+//! [44]
+
+//! [45]
+    model.removeRows(row, 5);
+//! [45] //! [46]
+    model.submitAll();
+//! [46]
+    }
+}
+
+//! [47]
+class XyzResult : public QSqlResult
+{
+public:
+    XyzResult(const QSqlDriver *driver)
+        : QSqlResult(driver) {}
+    ~XyzResult() {}
+
+protected:
+    QVariant data(int /* index */) { return QVariant(); }
+    bool isNull(int /* index */) { return false; }
+    bool reset(const QString & /* query */) { return false; }
+    bool fetch(int /* index */) { return false; }
+    bool fetchFirst() { return false; }
+    bool fetchLast() { return false; }
+    int size() { return 0; }
+    int numRowsAffected() { return 0; }
+    QSqlRecord record() const { return QSqlRecord(); }
+};
+//! [47]
+
+//! [48]
+class XyzDriver : public QSqlDriver
+{
+public:
+    XyzDriver() {}
+    ~XyzDriver() {}
+
+    bool hasFeature(DriverFeature /* feature */) const { return false; }
+    bool open(const QString & /* db */, const QString & /* user */,
+              const QString & /* password */, const QString & /* host */,
+              int /* port */, const QString & /* options */)
+        { return false; }
+    void close() {}
+    QSqlResult *createResult() const { return new XyzResult(this); }
+};
+//! [48]
+
+int main(int argc, char **argv)
+{
+    QApplication app(argc, argv);
+
+    QSqlDatabase_snippets();
+    QSqlField_snippets();
+    QSqlQuery_snippets();
+    QSqlQueryModel_snippets();
+    QSqlTableModel_snippets();
+
+    XyzDriver driver;
+    XyzResult result(&driver);
+}