Qt Documentation

Qt 5.8
Qt SQL
C++ Classes
QSqlDriverPlugin

QSqlDriverPlugin Class

The QSqlDriverPlugin class provides an abstract base for custom QSqlDriver plugins. More...

Header:	#include <QSqlDriverPlugin>
qmake:	QT += sql
Inherits:	QObject

List of all members, including inherited members

Public Functions

	QSqlDriverPlugin(QObject *parent = Q_NULLPTR)
	~QSqlDriverPlugin()
virtual QSqlDriver *	create(const QString &key) = 0

31 public functions inherited from QObject

Additional Inherited Members

1 property inherited from QObject
1 public slot inherited from QObject
2 signals inherited from QObject
11 static public members inherited from QObject
9 protected functions inherited from QObject

Detailed Description

The QSqlDriverPlugin class provides an abstract base for custom QSqlDriver plugins.

The SQL driver plugin is a simple plugin interface that makes it easy to create your own SQL driver plugins that can be loaded dynamically by Qt.

Writing a SQL plugin is achieved by subclassing this base class, reimplementing the pure virtual function create(), and exporting the class with the Q_PLUGIN_METADATA() macro. See the SQL plugins that come with Qt for example implementations (in the plugins/src/sqldrivers subdirectory of the source distribution).

The json file containing the metadata for the plugin contains a list of keys indicating the supported sql drivers

{ "Keys": [ "mysqldriver" ] }

See also How to Create Qt Plugins.

Member Function Documentation

QSqlDriverPlugin::QSqlDriverPlugin(QObject **parent* = Q_NULLPTR)

Constructs a SQL driver plugin and sets the parent to parent. This is invoked automatically by the moc generated code that exports the plugin.

QSqlDriverPlugin::~QSqlDriverPlugin()

Destroys the SQL driver plugin.

You never have to call this explicitly. Qt destroys a plugin automatically when it is no longer used.

`[pure virtual]` QSqlDriver QSqlDriverPlugin::create(const QString &key*)

Creates and returns a QSqlDriver object for the driver called key. The driver key is usually the class name of the required driver. Keys are case sensitive.