136 lines
4.2 KiB
C++
136 lines
4.2 KiB
C++
/****************************************************************************
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**
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** Copyright (C) 2015 The Qt Company Ltd.
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** Contact: http://www.qt.io/licensing/
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**
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** This file is part of the documentation of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:BSD$
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** You may use this file under the terms of the BSD license as follows:
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**
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** "Redistribution and use in source and binary forms, with or without
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** modification, are permitted provided that the following conditions are
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** met:
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** * Redistributions of source code must retain the above copyright
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** notice, this list of conditions and the following disclaimer.
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** * Redistributions in binary form must reproduce the above copyright
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** notice, this list of conditions and the following disclaimer in
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** the documentation and/or other materials provided with the
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** distribution.
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** * Neither the name of The Qt Company Ltd nor the names of its
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** contributors may be used to endorse or promote products derived
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** from this software without specific prior written permission.
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**
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**
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** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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//! [0]
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// WRONG
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QSqlDatabase db = QSqlDatabase::database("sales");
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QSqlQuery query("SELECT NAME, DOB FROM EMPLOYEES", db);
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QSqlDatabase::removeDatabase("sales"); // will output a warning
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// "db" is now a dangling invalid database connection,
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// "query" contains an invalid result set
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//! [0]
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//! [1]
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{
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QSqlDatabase db = QSqlDatabase::database("sales");
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QSqlQuery query("SELECT NAME, DOB FROM EMPLOYEES", db);
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}
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// Both "db" and "query" are destroyed because they are out of scope
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QSqlDatabase::removeDatabase("sales"); // correct
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//! [1]
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//! [2]
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QSqlDatabase::registerSqlDriver("MYDRIVER",
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new QSqlDriverCreator<MyDatabaseDriver>);
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QSqlDatabase db = QSqlDatabase::addDatabase("MYDRIVER");
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//! [2]
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//! [3]
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...
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db = QSqlDatabase::addDatabase("QODBC");
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db.setDatabaseName("DRIVER={Microsoft Access Driver (*.mdb)};FIL={MS Access};DBQ=myaccessfile.mdb");
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if (db.open()) {
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// success!
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}
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...
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//! [3]
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//! [4]
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...
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// MySQL connection
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db.setConnectOptions("SSL_KEY=client-key.pem;SSL_CERT=client-cert.pem;SSL_CA=ca-cert.pem;CLIENT_IGNORE_SPACE=1"); // use an SSL connection to the server
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if (!db.open()) {
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db.setConnectOptions(); // clears the connect option string
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...
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}
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...
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// PostgreSQL connection
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db.setConnectOptions("requiressl=1"); // enable PostgreSQL SSL connections
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if (!db.open()) {
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db.setConnectOptions(); // clear options
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...
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}
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...
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// ODBC connection
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db.setConnectOptions("SQL_ATTR_ACCESS_MODE=SQL_MODE_READ_ONLY;SQL_ATTR_TRACE=SQL_OPT_TRACE_ON"); // set ODBC options
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if (!db.open()) {
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db.setConnectOptions(); // don't try to set this option
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...
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}
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//! [4]
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//! [5]
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#include "qtdir/src/sql/drivers/psql/qsql_psql.cpp"
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//! [5]
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//! [6]
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PGconn *con = PQconnectdb("host=server user=bart password=simpson dbname=springfield");
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QPSQLDriver *drv = new QPSQLDriver(con);
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QSqlDatabase db = QSqlDatabase::addDatabase(drv); // becomes the new default connection
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QSqlQuery query;
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query.exec("SELECT NAME, ID FROM STAFF");
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...
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//! [6]
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//! [7]
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unix:LIBS += -lpq
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win32:LIBS += libpqdll.lib
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//! [7]
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//! [8]
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QSqlDatabase db;
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qDebug() << db.isValid(); // Returns false
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db = QSqlDatabase::database("sales");
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qDebug() << db.isValid(); // Returns \c true if "sales" connection exists
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QSqlDatabase::removeDatabase("sales");
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qDebug() << db.isValid(); // Returns false
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//! [8]
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