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katie/src/sql/kernel/qsqldatabase.cpp
Ivailo Monev bfbc380756 initial import 
Signed-off-by: Ivailo Monev <xakepa10@gmail.com>
2015-12-10 05:06:13 +02:00

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/****************************************************************************
**
** Copyright (C) 2015 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing/
**
** This file is part of the QtSql module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see http://www.qt.io/terms-conditions. For further
** information use the contact form at http://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 or version 3 as published by the Free
** Software Foundation and appearing in the file LICENSE.LGPLv21 and
** LICENSE.LGPLv3 included in the packaging of this file. Please review the
** following information to ensure the GNU Lesser General Public License
** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** As a special exception, The Qt Company gives you certain additional
** rights. These rights are described in The Qt Company LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qsqldatabase.h"
#include "qsqlquery.h"
#ifdef Q_OS_WIN32
// Conflicting declarations of LPCBYTE in sqlfront.h and winscard.h
#define _WINSCARD_H_
#endif
#ifdef QT_SQL_PSQL
#include "../drivers/psql/qsql_psql.h"
#endif
#ifdef QT_SQL_MYSQL
#include "../drivers/mysql/qsql_mysql.h"
#endif
#ifdef QT_SQL_ODBC
#include "../drivers/odbc/qsql_odbc.h"
#endif
#ifdef QT_SQL_OCI
#include "../drivers/oci/qsql_oci.h"
#endif
#ifdef QT_SQL_TDS
// conflicting RETCODE typedef between odbc and freetds
#define RETCODE DBRETCODE
#include "../drivers/tds/qsql_tds.h"
#undef RETCODE
#endif
#ifdef QT_SQL_DB2
#include "../drivers/db2/qsql_db2.h"
#endif
#ifdef QT_SQL_SQLITE
#include "../drivers/sqlite/qsql_sqlite.h"
#endif
#ifdef QT_SQL_SQLITE2
#include "../drivers/sqlite2/qsql_sqlite2.h"
#endif
#ifdef QT_SQL_IBASE
#undef SQL_FLOAT // avoid clash with ODBC
#undef SQL_DOUBLE
#undef SQL_TIMESTAMP
#undef SQL_TYPE_TIME
#undef SQL_TYPE_DATE
#undef SQL_DATE
#define SCHAR IBASE_SCHAR // avoid clash with ODBC (older versions of ibase.h with Firebird)
#include "../drivers/ibase/qsql_ibase.h"
#undef SCHAR
#endif
#include "qdebug.h"
#include "qcoreapplication.h"
#include "qreadwritelock.h"
#include "qsqlresult.h"
#include "qsqldriver.h"
#include "qsqldriverplugin.h"
#include "qsqlindex.h"
#include "qfactoryloader_p.h"
#include "qsqlnulldriver_p.h"
#include "qmutex.h"
#include "qhash.h"
#include <stdlib.h>
QT_BEGIN_NAMESPACE
#ifndef QT_NO_LIBRARY
Q_GLOBAL_STATIC_WITH_ARGS(QFactoryLoader, loader,
(QSqlDriverFactoryInterface_iid,
QLatin1String("/sqldrivers")))
#endif
QT_STATIC_CONST_IMPL char *QSqlDatabase::defaultConnection = "qt_sql_default_connection";
typedef QHash<QString, QSqlDriverCreatorBase*> DriverDict;
class QConnectionDict: public QHash<QString, QSqlDatabase>
{
public:
inline bool contains_ts(const QString &key)
{
QReadLocker locker(&lock);
return contains(key);
}
inline QStringList keys_ts() const
{
QReadLocker locker(&lock);
return keys();
}
mutable QReadWriteLock lock;
};
Q_GLOBAL_STATIC(QConnectionDict, dbDict)
class QSqlDatabasePrivate
{
public:
QSqlDatabasePrivate(QSqlDatabase *d, QSqlDriver *dr = 0):
q(d),
driver(dr),
port(-1)
{
ref = 1;
precisionPolicy= QSql::LowPrecisionDouble;
}
QSqlDatabasePrivate(const QSqlDatabasePrivate &other);
~QSqlDatabasePrivate();
void init(const QString& type);
void copy(const QSqlDatabasePrivate *other);
void disable();
QAtomicInt ref;
QSqlDatabase *q;
QSqlDriver* driver;
QString dbname;
QString uname;
QString pword;
QString hname;
QString drvName;
int port;
QString connOptions;
QString connName;
QSql::NumericalPrecisionPolicy precisionPolicy;
static QSqlDatabasePrivate *shared_null();
static QSqlDatabase database(const QString& name, bool open);
static void addDatabase(const QSqlDatabase &db, const QString & name);
static void removeDatabase(const QString& name);
static void invalidateDb(const QSqlDatabase &db, const QString &name, bool doWarn = true);
static DriverDict &driverDict();
static void cleanConnections();
};
QSqlDatabasePrivate::QSqlDatabasePrivate(const QSqlDatabasePrivate &other)
{
ref = 1;
q = other.q;
dbname = other.dbname;
uname = other.uname;
pword = other.pword;
hname = other.hname;
drvName = other.drvName;
port = other.port;
connOptions = other.connOptions;
driver = other.driver;
precisionPolicy = other.precisionPolicy;
}
QSqlDatabasePrivate::~QSqlDatabasePrivate()
{
if (driver != shared_null()->driver)
delete driver;
}
void QSqlDatabasePrivate::cleanConnections()
{
QConnectionDict *dict = dbDict();
Q_ASSERT(dict);
QWriteLocker locker(&dict->lock);
QConnectionDict::iterator it = dict->begin();
while (it != dict->end()) {
invalidateDb(it.value(), it.key(), false);
++it;
}
dict->clear();
}
static bool qDriverDictInit = false;
static void cleanDriverDict()
{
qDeleteAll(QSqlDatabasePrivate::driverDict());
QSqlDatabasePrivate::driverDict().clear();
QSqlDatabasePrivate::cleanConnections();
qDriverDictInit = false;
}
DriverDict &QSqlDatabasePrivate::driverDict()
{
static DriverDict dict;
if (!qDriverDictInit) {
qDriverDictInit = true;
qAddPostRoutine(cleanDriverDict);
}
return dict;
}
QSqlDatabasePrivate *QSqlDatabasePrivate::shared_null()
{
static QSqlNullDriver dr;
static QSqlDatabasePrivate n(NULL, &dr);
return &n;
}
void QSqlDatabasePrivate::invalidateDb(const QSqlDatabase &db, const QString &name, bool doWarn)
{
if (db.d->ref != 1 && doWarn) {
qWarning("QSqlDatabasePrivate::removeDatabase: connection '%s' is still in use, "
"all queries will cease to work.", name.toLocal8Bit().constData());
db.d->disable();
db.d->connName.clear();
}
}
void QSqlDatabasePrivate::removeDatabase(const QString &name)
{
QConnectionDict *dict = dbDict();
Q_ASSERT(dict);
QWriteLocker locker(&dict->lock);
if (!dict->contains(name))
return;
invalidateDb(dict->take(name), name);
}
void QSqlDatabasePrivate::addDatabase(const QSqlDatabase &db, const QString &name)
{
QConnectionDict *dict = dbDict();
Q_ASSERT(dict);
QWriteLocker locker(&dict->lock);
if (dict->contains(name)) {
invalidateDb(dict->take(name), name);
qWarning("QSqlDatabasePrivate::addDatabase: duplicate connection name '%s', old "
"connection removed.", name.toLocal8Bit().data());
}
dict->insert(name, db);
db.d->connName = name;
}
/*! \internal
*/
QSqlDatabase QSqlDatabasePrivate::database(const QString& name, bool open)
{
const QConnectionDict *dict = dbDict();
Q_ASSERT(dict);
dict->lock.lockForRead();
QSqlDatabase db = dict->value(name);
dict->lock.unlock();
if (db.isValid() && !db.isOpen() && open) {
if (!db.open())
qWarning() << "QSqlDatabasePrivate::database: unable to open database:" << db.lastError().text();
}
return db;
}
/*! \internal
Copies the connection data from \a other.
*/
void QSqlDatabasePrivate::copy(const QSqlDatabasePrivate *other)
{
q = other->q;
dbname = other->dbname;
uname = other->uname;
pword = other->pword;
hname = other->hname;
drvName = other->drvName;
port = other->port;
connOptions = other->connOptions;
precisionPolicy = other->precisionPolicy;
}
void QSqlDatabasePrivate::disable()
{
if (driver != shared_null()->driver) {
delete driver;
driver = shared_null()->driver;
}
}
/*!
\class QSqlDriverCreatorBase
\brief The QSqlDriverCreatorBase class is the base class for
SQL driver factories.
\ingroup database
\inmodule QtSql
Reimplement createObject() to return an instance of the specific
QSqlDriver subclass that you want to provide.
See QSqlDatabase::registerSqlDriver() for details.
\sa QSqlDriverCreator
*/
/*!
\fn QSqlDriverCreatorBase::~QSqlDriverCreatorBase()
Destroys the SQL driver creator object.
*/
/*!
\fn QSqlDriver *QSqlDriverCreatorBase::createObject() const
Reimplement this function to returns a new instance of a
QSqlDriver subclass.
*/
/*!
\class QSqlDriverCreator
\brief The QSqlDriverCreator class is a template class that
provides a SQL driver factory for a specific driver type.
\ingroup database
\inmodule QtSql
QSqlDriverCreator<T> instantiates objects of type T, where T is a
QSqlDriver subclass.
See QSqlDatabase::registerSqlDriver() for details.
*/
/*!
\fn QSqlDriver *QSqlDriverCreator::createObject() const
\reimp
*/
/*!
\class QSqlDatabase
\brief The QSqlDatabase class represents a connection to
a database.
\ingroup database
\inmodule QtSql
The QSqlDatabase class provides an interface for accessing a
database through a connection. An instance of QSqlDatabase
represents the connection. The connection provides access to the
database via one of the \l{SQL Database Drivers#Supported
Databases} {supported database drivers}, which are derived from
QSqlDriver. Alternatively, you can subclass your own database
driver from QSqlDriver. See \l{How to Write Your Own Database
Driver} for more information.
Create a connection (i.e., an instance of QSqlDatabase) by calling
one of the static addDatabase() functions, where you specify
\l{SQL Database Drivers#Supported Databases} {the driver or type
of driver} to use (i.e., what kind of database will you access?)
and a connection name. A connection is known by its own name,
\e{not} by the name of the database it connects to. You can have
multiple connections to one database. QSqlDatabase also supports
the concept of a \e{default} connection, which is the unnamed
connection. To create the default connection, don't pass the
connection name argument when you call addDatabase().
Subsequently, when you call any static member function that takes
the connection name argument, if you don't pass the connection
name argument, the default connection is assumed. The following
snippet shows how to create and open a default connection to a
PostgreSQL database:
\snippet doc/src/snippets/sqldatabase/sqldatabase.cpp 0
Once the QSqlDatabase object has been created, set the connection
parameters with setDatabaseName(), setUserName(), setPassword(),
setHostName(), setPort(), and setConnectOptions(). Then call
open() to activate the physical connection to the database. The
connection is not usable until you open it.
The connection defined above will be the \e{default} connection,
because we didn't give a connection name to \l{QSqlDatabase::}
{addDatabase()}. Subsequently, you can get the default connection
by calling database() without the connection name argument:
\snippet doc/src/snippets/sqldatabase/sqldatabase.cpp 1
QSqlDatabase is a value class. Changes made to a database
connection via one instance of QSqlDatabase will affect other
instances of QSqlDatabase that represent the same connection. Use
cloneDatabase() to create an independent database connection based
on an existing one.
If you create multiple database connections, specify a unique
connection name for each one, when you call addDatabase(). Use
database() with a connection name to get that connection. Use
removeDatabase() with a connection name to remove a connection.
QSqlDatabase outputs a warning if you try to remove a connection
referenced by other QSqlDatabase objects. Use contains() to see if
a given connection name is in the list of connections.
Once a connection is established, you can call tables() to get the
list of tables in the database, call primaryIndex() to get a
table's primary index, and call record() to get meta-information
about a table's fields (e.g., field names).
\note QSqlDatabase::exec() is deprecated. Use QSqlQuery::exec()
instead.
If the driver supports transactions, use transaction() to start a
transaction, and commit() or rollback() to complete it. Use
\l{QSqlDriver::} {hasFeature()} to ask if the driver supports
transactions. \note When using transactions, you must start the
transaction before you create your query.
If an error occurrs, lastError() will return information about it.
Get the names of the available SQL drivers with drivers(). Check
for the presence of a particular driver with isDriverAvailable().
If you have created your own custom driver, you must register it
with registerSqlDriver().
\sa QSqlDriver, QSqlQuery, {QtSql Module}, {Threads and the SQL Module}
*/
/*! \fn QSqlDatabase QSqlDatabase::addDatabase(const QString &type, const QString &connectionName)
\threadsafe
Adds a database to the list of database connections using the
driver \a type and the connection name \a connectionName. If
there already exists a database connection called \a
connectionName, that connection is removed.
The database connection is referred to by \a connectionName. The
newly added database connection is returned.
If \a type is not available or could not be loaded, isValid() returns false.
If \a connectionName is not specified, the new connection becomes
the default connection for the application, and subsequent calls
to database() without the connection name argument will return the
default connection. If a \a connectionName is provided here, use
database(\a connectionName) to retrieve the connection.
\warning If you add a connection with the same name as an existing
connection, the new connection replaces the old one. If you call
this function more than once without specifying \a connectionName,
the default connection will be the one replaced.
Before using the connection, it must be initialized. e.g., call
some or all of setDatabaseName(), setUserName(), setPassword(),
setHostName(), setPort(), and setConnectOptions(), and, finally,
open().
\sa database() removeDatabase() {Threads and the SQL Module}
*/
QSqlDatabase QSqlDatabase::addDatabase(const QString &type, const QString &connectionName)
{
QSqlDatabase db(type);
QSqlDatabasePrivate::addDatabase(db, connectionName);
return db;
}
/*!
\threadsafe
Returns the database connection called \a connectionName. The
database connection must have been previously added with
addDatabase(). If \a open is true (the default) and the database
connection is not already open it is opened now. If no \a
connectionName is specified the default connection is used. If \a
connectionName does not exist in the list of databases, an invalid
connection is returned.
\sa isOpen() {Threads and the SQL Module}
*/
QSqlDatabase QSqlDatabase::database(const QString& connectionName, bool open)
{
return QSqlDatabasePrivate::database(connectionName, open);
}
/*!
\threadsafe
Removes the database connection \a connectionName from the list of
database connections.
\warning There should be no open queries on the database
connection when this function is called, otherwise a resource leak
will occur.
Example:
\snippet doc/src/snippets/code/src_sql_kernel_qsqldatabase.cpp 0
The correct way to do it:
\snippet doc/src/snippets/code/src_sql_kernel_qsqldatabase.cpp 1
To remove the default connection, which may have been created with a
call to addDatabase() not specifying a connection name, you can
retrieve the default connection name by calling connectionName() on
the database returned by database(). Note that if a default database
hasn't been created an invalid database will be returned.
\sa database() connectionName() {Threads and the SQL Module}
*/
void QSqlDatabase::removeDatabase(const QString& connectionName)
{
QSqlDatabasePrivate::removeDatabase(connectionName);
}
/*!
Returns a list of all the available database drivers.
\sa registerSqlDriver()
*/
QStringList QSqlDatabase::drivers()
{
QStringList list;
#ifdef QT_SQL_PSQL
list << QLatin1String("QPSQL7");
list << QLatin1String("QPSQL");
#endif
#ifdef QT_SQL_MYSQL
list << QLatin1String("QMYSQL3");
list << QLatin1String("QMYSQL");
#endif
#ifdef QT_SQL_ODBC
list << QLatin1String("QODBC3");
list << QLatin1String("QODBC");
#endif
#ifdef QT_SQL_OCI
list << QLatin1String("QOCI8");
list << QLatin1String("QOCI");
#endif
#ifdef QT_SQL_TDS
list << QLatin1String("QTDS7");
list << QLatin1String("QTDS");
#endif
#ifdef QT_SQL_DB2
list << QLatin1String("QDB2");
#endif
#ifdef QT_SQL_SQLITE
list << QLatin1String("QSQLITE");
#endif
#ifdef QT_SQL_SQLITE2
list << QLatin1String("QSQLITE2");
#endif
#ifdef QT_SQL_IBASE
list << QLatin1String("QIBASE");
#endif
#ifndef QT_NO_LIBRARY
if (QFactoryLoader *fl = loader()) {
QStringList keys = fl->keys();
for (QStringList::const_iterator i = keys.constBegin(); i != keys.constEnd(); ++i) {
if (!list.contains(*i))
list << *i;
}
}
#endif
DriverDict dict = QSqlDatabasePrivate::driverDict();
for (DriverDict::const_iterator i = dict.constBegin(); i != dict.constEnd(); ++i) {
if (!list.contains(i.key()))
list << i.key();
}
return list;
}
/*!
This function registers a new SQL driver called \a name, within
the SQL framework. This is useful if you have a custom SQL driver
and don't want to compile it as a plugin.
Example:
\snippet doc/src/snippets/code/src_sql_kernel_qsqldatabase.cpp 2
QSqlDatabase takes ownership of the \a creator pointer, so you
mustn't delete it yourself.
\sa drivers()
*/
void QSqlDatabase::registerSqlDriver(const QString& name, QSqlDriverCreatorBase *creator)
{
delete QSqlDatabasePrivate::driverDict().take(name);
if (creator)
QSqlDatabasePrivate::driverDict().insert(name, creator);
}
/*!
\threadsafe
Returns true if the list of database connections contains \a
connectionName; otherwise returns false.
\sa connectionNames(), database(), {Threads and the SQL Module}
*/
bool QSqlDatabase::contains(const QString& connectionName)
{
return dbDict()->contains_ts(connectionName);
}
/*!
\threadsafe
Returns a list containing the names of all connections.
\sa contains(), database(), {Threads and the SQL Module}
*/
QStringList QSqlDatabase::connectionNames()
{
return dbDict()->keys_ts();
}
/*!
\overload
Creates a QSqlDatabase connection that uses the driver referred
to by \a type. If the \a type is not recognized, the database
connection will have no functionality.
The currently available driver types are:
\table
\header \i Driver Type \i Description
\row \i QDB2 \i IBM DB2
\row \i QIBASE \i Borland InterBase Driver
\row \i QMYSQL \i MySQL Driver
\row \i QOCI \i Oracle Call Interface Driver
\row \i QODBC \i ODBC Driver (includes Microsoft SQL Server)
\row \i QPSQL \i PostgreSQL Driver
\row \i QSQLITE \i SQLite version 3 or above
\row \i QSQLITE2 \i SQLite version 2
\row \i QTDS \i Sybase Adaptive Server
\endtable
Additional third party drivers, including your own custom
drivers, can be loaded dynamically.
\sa {SQL Database Drivers}, registerSqlDriver(), drivers()
*/
QSqlDatabase::QSqlDatabase(const QString &type)
{
d = new QSqlDatabasePrivate(this);
d->init(type);
}
/*!
\overload
Creates a database connection using the given \a driver.
*/
QSqlDatabase::QSqlDatabase(QSqlDriver *driver)
{
d = new QSqlDatabasePrivate(this, driver);
}
/*!
Creates an empty, invalid QSqlDatabase object. Use addDatabase(),
removeDatabase(), and database() to get valid QSqlDatabase
objects.
*/
QSqlDatabase::QSqlDatabase()
{
d = QSqlDatabasePrivate::shared_null();
d->ref.ref();
}
/*!
Creates a copy of \a other.
*/
QSqlDatabase::QSqlDatabase(const QSqlDatabase &other)
{
d = other.d;
d->ref.ref();
}
/*!
Assigns \a other to this object.
*/
QSqlDatabase &QSqlDatabase::operator=(const QSqlDatabase &other)
{
qAtomicAssign(d, other.d);
return *this;
}
/*!
\internal
Create the actual driver instance \a type.
*/
void QSqlDatabasePrivate::init(const QString &type)
{
drvName = type;
if (!driver) {
#ifdef QT_SQL_PSQL
if (type == QLatin1String("QPSQL") || type == QLatin1String("QPSQL7"))
driver = new QPSQLDriver();
#endif
#ifdef QT_SQL_MYSQL
if (type == QLatin1String("QMYSQL") || type == QLatin1String("QMYSQL3"))
driver = new QMYSQLDriver();
#endif
#ifdef QT_SQL_ODBC
if (type == QLatin1String("QODBC") || type == QLatin1String("QODBC3"))
driver = new QODBCDriver();
#endif
#ifdef QT_SQL_OCI
if (type == QLatin1String("QOCI") || type == QLatin1String("QOCI8"))
driver = new QOCIDriver();
#endif
#ifdef QT_SQL_TDS
if (type == QLatin1String("QTDS") || type == QLatin1String("QTDS7"))
driver = new QTDSDriver();
#endif
#ifdef QT_SQL_DB2
if (type == QLatin1String("QDB2"))
driver = new QDB2Driver();
#endif
#ifdef QT_SQL_SQLITE
if (type == QLatin1String("QSQLITE"))
driver = new QSQLiteDriver();
#endif
#ifdef QT_SQL_SQLITE2
if (type == QLatin1String("QSQLITE2"))
driver = new QSQLite2Driver();
#endif
#ifdef QT_SQL_IBASE
if (type == QLatin1String("QIBASE"))
driver = new QIBaseDriver();
#endif
}
if (!driver) {
DriverDict dict = QSqlDatabasePrivate::driverDict();
for (DriverDict::const_iterator it = dict.constBegin();
it != dict.constEnd() && !driver; ++it) {
if (type == it.key()) {
driver = ((QSqlDriverCreatorBase*)(*it))->createObject();
}
}
}
#ifndef QT_NO_LIBRARY
if (!driver && loader()) {
if (QSqlDriverFactoryInterface *factory = qobject_cast<QSqlDriverFactoryInterface*>(loader()->instance(type)))
driver = factory->create(type);
}
#endif // QT_NO_LIBRARY
if (!driver) {
qWarning("QSqlDatabase: %s driver not loaded", type.toLatin1().data());
qWarning("QSqlDatabase: available drivers: %s",
QSqlDatabase::drivers().join(QLatin1String(" ")).toLatin1().data());
if (QCoreApplication::instance() == 0)
qWarning("QSqlDatabase: an instance of QCoreApplication is required for loading driver plugins");
driver = shared_null()->driver;
}
}
/*!
Destroys the object and frees any allocated resources.
\sa close()
*/
QSqlDatabase::~QSqlDatabase()
{
if (!d->ref.deref()) {
close();
delete d;
}
}
/*!
Executes a SQL statement on the database and returns a QSqlQuery
object. Use lastError() to retrieve error information. If \a
query is empty, an empty, invalid query is returned and
lastError() is not affected.
\sa QSqlQuery, lastError()
*/
QSqlQuery QSqlDatabase::exec(const QString & query) const
{
QSqlQuery r(d->driver->createResult());
if (!query.isEmpty()) {
r.exec(query);
d->driver->setLastError(r.lastError());
}
return r;
}
/*!
Opens the database connection using the current connection
values. Returns true on success; otherwise returns false. Error
information can be retrieved using lastError().
\sa lastError() setDatabaseName() setUserName() setPassword()
\sa setHostName() setPort() setConnectOptions()
*/
bool QSqlDatabase::open()
{
return d->driver->open(d->dbname, d->uname, d->pword, d->hname,
d->port, d->connOptions);
}
/*!
\overload
Opens the database connection using the given \a user name and \a
password. Returns true on success; otherwise returns false. Error
information can be retrieved using the lastError() function.
This function does not store the password it is given. Instead,
the password is passed directly to the driver for opening the
connection and it is then discarded.
\sa lastError()
*/
bool QSqlDatabase::open(const QString& user, const QString& password)
{
setUserName(user);
return d->driver->open(d->dbname, user, password, d->hname,
d->port, d->connOptions);
}
/*!
Closes the database connection, freeing any resources acquired, and
invalidating any existing QSqlQuery objects that are used with the
database.
This will also affect copies of this QSqlDatabase object.
\sa removeDatabase()
*/
void QSqlDatabase::close()
{
d->driver->close();
}
/*!
Returns true if the database connection is currently open;
otherwise returns false.
*/
bool QSqlDatabase::isOpen() const
{
return d->driver->isOpen();
}
/*!
Returns true if there was an error opening the database
connection; otherwise returns false. Error information can be
retrieved using the lastError() function.
*/
bool QSqlDatabase::isOpenError() const
{
return d->driver->isOpenError();
}
/*!
Begins a transaction on the database if the driver supports
transactions. Returns \c{true} if the operation succeeded.
Otherwise it returns \c{false}.
\sa QSqlDriver::hasFeature(), commit(), rollback()
*/
bool QSqlDatabase::transaction()
{
if (!d->driver->hasFeature(QSqlDriver::Transactions))
return false;
return d->driver->beginTransaction();
}
/*!
Commits a transaction to the database if the driver supports
transactions and a transaction() has been started. Returns \c{true}
if the operation succeeded. Otherwise it returns \c{false}.
\note For some databases, the commit will fail and return \c{false}
if there is an \l{QSqlQuery::isActive()} {active query} using the
database for a \c{SELECT}. Make the query \l{QSqlQuery::isActive()}
{inactive} before doing the commit.
Call lastError() to get information about errors.
\sa QSqlQuery::isActive() QSqlDriver::hasFeature() rollback()
*/
bool QSqlDatabase::commit()
{
if (!d->driver->hasFeature(QSqlDriver::Transactions))
return false;
return d->driver->commitTransaction();
}
/*!
Rolls back a transaction on the database, if the driver supports
transactions and a transaction() has been started. Returns \c{true}
if the operation succeeded. Otherwise it returns \c{false}.
\note For some databases, the rollback will fail and return
\c{false} if there is an \l{QSqlQuery::isActive()} {active query}
using the database for a \c{SELECT}. Make the query
\l{QSqlQuery::isActive()} {inactive} before doing the rollback.
Call lastError() to get information about errors.
\sa QSqlQuery::isActive() QSqlDriver::hasFeature() commit()
*/
bool QSqlDatabase::rollback()
{
if (!d->driver->hasFeature(QSqlDriver::Transactions))
return false;
return d->driver->rollbackTransaction();
}
/*!
Sets the connection's database name to \a name. To have effect,
the database name must be set \e{before} the connection is
\l{open()} {opened}. Alternatively, you can close() the
connection, set the database name, and call open() again. \note
The \e{database name} is not the \e{connection name}. The
connection name must be passed to addDatabase() at connection
object create time.
For the QOCI (Oracle) driver, the database name is the TNS
Service Name.
For the QODBC driver, the \a name can either be a DSN, a DSN
filename (in which case the file must have a \c .dsn extension),
or a connection string.
For example, Microsoft Access users can use the following
connection string to open an \c .mdb file directly, instead of
having to create a DSN entry in the ODBC manager:
\snippet doc/src/snippets/code/src_sql_kernel_qsqldatabase.cpp 3
There is no default value.
\sa databaseName() setUserName() setPassword() setHostName()
\sa setPort() setConnectOptions() open()
*/
void QSqlDatabase::setDatabaseName(const QString& name)
{
if (isValid())
d->dbname = name;
}
/*!
Sets the connection's user name to \a name. To have effect, the
user name must be set \e{before} the connection is \l{open()}
{opened}. Alternatively, you can close() the connection, set the
user name, and call open() again.
There is no default value.
\sa userName() setDatabaseName() setPassword() setHostName()
\sa setPort() setConnectOptions() open()
*/
void QSqlDatabase::setUserName(const QString& name)
{
if (isValid())
d->uname = name;
}
/*!
Sets the connection's password to \a password. To have effect, the
password must be set \e{before} the connection is \l{open()}
{opened}. Alternatively, you can close() the connection, set the
password, and call open() again.
There is no default value.
\warning This function stores the password in plain text within
Qt. Use the open() call that takes a password as parameter to
avoid this behavior.
\sa password() setUserName() setDatabaseName() setHostName()
\sa setPort() setConnectOptions() open()
*/
void QSqlDatabase::setPassword(const QString& password)
{
if (isValid())
d->pword = password;
}
/*!
Sets the connection's host name to \a host. To have effect, the
host name must be set \e{before} the connection is \l{open()}
{opened}. Alternatively, you can close() the connection, set the
host name, and call open() again.
There is no default value.
\sa hostName() setUserName() setPassword() setDatabaseName()
\sa setPort() setConnectOptions() open()
*/
void QSqlDatabase::setHostName(const QString& host)
{
if (isValid())
d->hname = host;
}
/*!
Sets the connection's port number to \a port. To have effect, the
port number must be set \e{before} the connection is \l{open()}
{opened}. Alternatively, you can close() the connection, set the
port number, and call open() again..
There is no default value.
\sa port() setUserName() setPassword() setHostName()
\sa setDatabaseName() setConnectOptions() open()
*/
void QSqlDatabase::setPort(int port)
{
if (isValid())
d->port = port;
}
/*!
Returns the connection's database name, which may be empty.
\note The database name is not the connection name.
\sa setDatabaseName()
*/
QString QSqlDatabase::databaseName() const
{
return d->dbname;
}
/*!
Returns the connection's user name; it may be empty.
\sa setUserName()
*/
QString QSqlDatabase::userName() const
{
return d->uname;
}
/*!
Returns the connection's password. If the password was not set
with setPassword(), and if the password was given in the open()
call, or if no password was used, an empty string is returned.
*/
QString QSqlDatabase::password() const
{
return d->pword;
}
/*!
Returns the connection's host name; it may be empty.
\sa setHostName()
*/
QString QSqlDatabase::hostName() const
{
return d->hname;
}
/*!
Returns the connection's driver name.
\sa addDatabase(), driver()
*/
QString QSqlDatabase::driverName() const
{
return d->drvName;
}
/*!
Returns the connection's port number. The value is undefined if
the port number has not been set.
\sa setPort()
*/
int QSqlDatabase::port() const
{
return d->port;
}
/*!
Returns the database driver used to access the database
connection.
\sa addDatabase() drivers()
*/
QSqlDriver* QSqlDatabase::driver() const
{
return d->driver;
}
/*!
Returns information about the last error that occurred on the
database.
Failures that occur in conjunction with an individual query are
reported by QSqlQuery::lastError().
\sa QSqlError, QSqlQuery::lastError()
*/
QSqlError QSqlDatabase::lastError() const
{
return d->driver->lastError();
}
/*!
Returns a list of the database's tables, system tables and views,
as specified by the parameter \a type.
\sa primaryIndex(), record()
*/
QStringList QSqlDatabase::tables(QSql::TableType type) const
{
return d->driver->tables(type);
}
/*!
Returns the primary index for table \a tablename. If no primary
index exists an empty QSqlIndex is returned.
\sa tables(), record()
*/
QSqlIndex QSqlDatabase::primaryIndex(const QString& tablename) const
{
return d->driver->primaryIndex(tablename);
}
/*!
Returns a QSqlRecord populated with the names of all the fields in
the table (or view) called \a tablename. The order in which the
fields appear in the record is undefined. If no such table (or
view) exists, an empty record is returned.
*/
QSqlRecord QSqlDatabase::record(const QString& tablename) const
{
return d->driver->record(tablename);
}
/*!
Sets database-specific \a options. This must be done before the
connection is opened or it has no effect (or you can close() the
connection, call this function and open() the connection again).
The format of the \a options string is a semicolon separated list
of option names or option=value pairs. The options depend on the
database client used:
\table
\header \i ODBC \i MySQL \i PostgreSQL
\row
\i
\list
\i SQL_ATTR_ACCESS_MODE
\i SQL_ATTR_LOGIN_TIMEOUT
\i SQL_ATTR_CONNECTION_TIMEOUT
\i SQL_ATTR_CURRENT_CATALOG
\i SQL_ATTR_METADATA_ID
\i SQL_ATTR_PACKET_SIZE
\i SQL_ATTR_TRACEFILE
\i SQL_ATTR_TRACE
\i SQL_ATTR_CONNECTION_POOLING
\i SQL_ATTR_ODBC_VERSION
\endlist
\i
\list
\i CLIENT_COMPRESS
\i CLIENT_FOUND_ROWS
\i CLIENT_IGNORE_SPACE
\i CLIENT_SSL
\i CLIENT_ODBC
\i CLIENT_NO_SCHEMA
\i CLIENT_INTERACTIVE
\i UNIX_SOCKET
\i MYSQL_OPT_RECONNECT
\endlist
\i
\list
\i connect_timeout
\i options
\i tty
\i requiressl
\i service
\endlist
\header \i DB2 \i OCI \i TDS
\row
\i
\list
\i SQL_ATTR_ACCESS_MODE
\i SQL_ATTR_LOGIN_TIMEOUT
\endlist
\i
\list
\i OCI_ATTR_PREFETCH_ROWS
\i OCI_ATTR_PREFETCH_MEMORY
\endlist
\i
\e none
\header \i SQLite \i Interbase
\row
\i
\list
\i QSQLITE_BUSY_TIMEOUT
\i QSQLITE_OPEN_READONLY
\i QSQLITE_ENABLE_SHARED_CACHE
\endlist
\i
\list
\i ISC_DPB_LC_CTYPE
\i ISC_DPB_SQL_ROLE_NAME
\endlist
\endtable
Examples:
\snippet doc/src/snippets/code/src_sql_kernel_qsqldatabase.cpp 4
Refer to the client library documentation for more information
about the different options.
\sa connectOptions()
*/
void QSqlDatabase::setConnectOptions(const QString &options)
{
if (isValid())
d->connOptions = options;
}
/*!
Returns the connection options string used for this connection.
The string may be empty.
\sa setConnectOptions()
*/
QString QSqlDatabase::connectOptions() const
{
return d->connOptions;
}
/*!
Returns true if a driver called \a name is available; otherwise
returns false.
\sa drivers()
*/
bool QSqlDatabase::isDriverAvailable(const QString& name)
{
return drivers().contains(name);
}
/*! \fn QSqlDatabase QSqlDatabase::addDatabase(QSqlDriver* driver, const QString& connectionName)
This overload is useful when you want to create a database
connection with a \l{QSqlDriver} {driver} you instantiated
yourself. It might be your own database driver, or you might just
need to instantiate one of the Qt drivers yourself. If you do
this, it is recommended that you include the driver code in your
application. For example, you can create a PostgreSQL connection
with your own QPSQL driver like this:
\snippet doc/src/snippets/code/src_sql_kernel_qsqldatabase.cpp 5
\codeline
\snippet doc/src/snippets/code/src_sql_kernel_qsqldatabase.cpp 6
The above code sets up a PostgreSQL connection and instantiates a
QPSQLDriver object. Next, addDatabase() is called to add the
connection to the known connections so that it can be used by the
Qt SQL classes. When a driver is instantiated with a connection
handle (or set of handles), Qt assumes that you have already
opened the database connection.
\note We assume that \c qtdir is the directory where Qt is
installed. This will pull in the code that is needed to use the
PostgreSQL client library and to instantiate a QPSQLDriver object,
assuming that you have the PostgreSQL headers somewhere in your
include search path.
Remember that you must link your application against the database
client library. Make sure the client library is in your linker's
search path, and add lines like these to your \c{.pro} file:
\snippet doc/src/snippets/code/src_sql_kernel_qsqldatabase.cpp 7
The method described works for all the supplied drivers. The only
difference will be in the driver constructor arguments. Here is a
table of the drivers included with Qt, their source code files,
and their constructor arguments:
\table
\header \i Driver \i Class name \i Constructor arguments \i File to include
\row
\i QPSQL
\i QPSQLDriver
\i PGconn *connection
\i \c qsql_psql.cpp
\row
\i QMYSQL
\i QMYSQLDriver
\i MYSQL *connection
\i \c qsql_mysql.cpp
\row
\i QOCI
\i QOCIDriver
\i OCIEnv *environment, OCISvcCtx *serviceContext
\i \c qsql_oci.cpp
\row
\i QODBC
\i QODBCDriver
\i SQLHANDLE environment, SQLHANDLE connection
\i \c qsql_odbc.cpp
\row
\i QDB2
\i QDB2
\i SQLHANDLE environment, SQLHANDLE connection
\i \c qsql_db2.cpp
\row
\i QTDS
\i QTDSDriver
\i LOGINREC *loginRecord, DBPROCESS *dbProcess, const QString &hostName
\i \c qsql_tds.cpp
\row
\i QSQLITE
\i QSQLiteDriver
\i sqlite *connection
\i \c qsql_sqlite.cpp
\row
\i QIBASE
\i QIBaseDriver
\i isc_db_handle connection
\i \c qsql_ibase.cpp
\endtable
The host name (or service name) is needed when constructing the
QTDSDriver for creating new connections for internal queries. This
is to prevent blocking when several QSqlQuery objects are used
simultaneously.
\warning Adding a database connection with the same connection
name as an existing connection, causes the existing connection to
be replaced by the new one.
\warning The SQL framework takes ownership of the \a driver. It
must not be deleted. To remove the connection, use
removeDatabase().
\sa drivers()
*/
QSqlDatabase QSqlDatabase::addDatabase(QSqlDriver* driver, const QString& connectionName)
{
QSqlDatabase db(driver);
QSqlDatabasePrivate::addDatabase(db, connectionName);
return db;
}
/*!
Returns true if the QSqlDatabase has a valid driver.
Example:
\snippet doc/src/snippets/code/src_sql_kernel_qsqldatabase.cpp 8
*/
bool QSqlDatabase::isValid() const
{
return d->driver && d->driver != d->shared_null()->driver;
}
/*!
Clones the database connection \a other and and stores it as \a
connectionName. All the settings from the original database, e.g.
databaseName(), hostName(), etc., are copied across. Does nothing
if \a other is an invalid database. Returns the newly created
database connection.
\note The new connection has not been opened. Before using the new
connection, you must call open().
*/
QSqlDatabase QSqlDatabase::cloneDatabase(const QSqlDatabase &other, const QString &connectionName)
{
if (!other.isValid())
return QSqlDatabase();
QSqlDatabase db(other.driverName());
db.d->copy(other.d);
QSqlDatabasePrivate::addDatabase(db, connectionName);
return db;
}
/*!
\since 4.4
Returns the connection name, which may be empty. \note The
connection name is not the \l{databaseName()} {database name}.
\sa addDatabase()
*/
QString QSqlDatabase::connectionName() const
{
return d->connName;
}
/*!
\since 4.6
Sets the default numerical precision policy used by queries created
on this database connection to \a precisionPolicy.
Note: Drivers that don't support fetching numerical values with low
precision will ignore the precision policy. You can use
QSqlDriver::hasFeature() to find out whether a driver supports this
feature.
Note: Setting the default precision policy to \a precisionPolicy
doesn't affect any currently active queries.
\sa QSql::NumericalPrecisionPolicy, numericalPrecisionPolicy(),
QSqlQuery::setNumericalPrecisionPolicy(), QSqlQuery::numericalPrecisionPolicy()
*/
void QSqlDatabase::setNumericalPrecisionPolicy(QSql::NumericalPrecisionPolicy precisionPolicy)
{
if(driver())
driver()->setNumericalPrecisionPolicy(precisionPolicy);
d->precisionPolicy = precisionPolicy;
}
/*!
\since 4.6
Returns the current default precision policy for the database connection.
\sa QSql::NumericalPrecisionPolicy, setNumericalPrecisionPolicy(),
QSqlQuery::numericalPrecisionPolicy(), QSqlQuery::setNumericalPrecisionPolicy()
*/
QSql::NumericalPrecisionPolicy QSqlDatabase::numericalPrecisionPolicy() const
{
if(driver())
return driver()->numericalPrecisionPolicy();
else
return d->precisionPolicy;
}
#ifndef QT_NO_DEBUG_STREAM
QDebug operator<<(QDebug dbg, const QSqlDatabase &d)
{
if (!d.isValid()) {
dbg.nospace() << "QSqlDatabase(invalid)";
return dbg.space();
}
dbg.nospace() << "QSqlDatabase(driver=\"" << d.driverName() << "\", database=\""
<< d.databaseName() << "\", host=\"" << d.hostName() << "\", port=" << d.port()
<< ", user=\"" << d.userName() << "\", open=" << d.isOpen() << ")";
return dbg.space();
}
#endif
QT_END_NAMESPACE
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