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diff --git a/doc/src/snippets/code/src_sql_kernel_qsqldatabase.cpp b/doc/src/snippets/code/src_sql_kernel_qsqldatabase.cpp
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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."
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+//! [0]
+// WRONG
+QSqlDatabase db = QSqlDatabase::database("sales");
+QSqlQuery query("SELECT NAME, DOB FROM EMPLOYEES", db);
+QSqlDatabase::removeDatabase("sales"); // will output a warning
+
+// "db" is now a dangling invalid database connection,
+// "query" contains an invalid result set
+//! [0]
+
+
+//! [1]
+{
+    QSqlDatabase db = QSqlDatabase::database("sales");
+    QSqlQuery query("SELECT NAME, DOB FROM EMPLOYEES", db);
+}
+// Both "db" and "query" are destroyed because they are out of scope
+QSqlDatabase::removeDatabase("sales"); // correct
+//! [1]
+
+
+//! [2]
+QSqlDatabase::registerSqlDriver("MYDRIVER",
+                                new QSqlDriverCreator<MyDatabaseDriver>);
+QSqlDatabase db = QSqlDatabase::addDatabase("MYDRIVER");
+//! [2]
+
+
+//! [3]
+...
+db = QSqlDatabase::addDatabase("QODBC");
+db.setDatabaseName("DRIVER={Microsoft Access Driver (*.mdb)};FIL={MS Access};DBQ=myaccessfile.mdb");
+if (db.open()) {
+    // success!
+}
+...
+//! [3]
+
+
+//! [4]
+...
+// MySQL connection
+db.setConnectOptions("CLIENT_SSL=1;CLIENT_IGNORE_SPACE=1"); // use an SSL connection to the server
+if (!db.open()) {
+    db.setConnectOptions(); // clears the connect option string
+    ...
+}
+...
+// PostgreSQL connection
+db.setConnectOptions("requiressl=1"); // enable PostgreSQL SSL connections
+if (!db.open()) {
+    db.setConnectOptions(); // clear options
+    ...
+}
+...
+// ODBC connection
+db.setConnectOptions("SQL_ATTR_ACCESS_MODE=SQL_MODE_READ_ONLY;SQL_ATTR_TRACE=SQL_OPT_TRACE_ON"); // set ODBC options
+if (!db.open()) {
+    db.setConnectOptions(); // don't try to set this option
+    ...
+}
+//! [4]
+
+
+//! [5]
+#include "qtdir/src/sql/drivers/psql/qsql_psql.cpp"
+//! [5]
+
+
+//! [6]
+PGconn *con = PQconnectdb("host=server user=bart password=simpson dbname=springfield");
+QPSQLDriver *drv =  new QPSQLDriver(con);
+QSqlDatabase db = QSqlDatabase::addDatabase(drv); // becomes the new default connection
+QSqlQuery query;
+query.exec("SELECT NAME, ID FROM STAFF");
+...
+//! [6]
+
+
+//! [7]
+unix:LIBS += -lpq
+win32:LIBS += libpqdll.lib
+//! [7]
+
+
+//! [8]
+QSqlDatabase db;
+qDebug() << db.isValid();    // Returns false
+
+db = QSqlDatabase::database("sales");
+qDebug() << db.isValid();    // Returns true if "sales" connection exists
+
+QSqlDatabase::removeDatabase("sales");
+qDebug() << db.isValid();    // Returns false
+//! [8]