Qt 4.3: QSqlDriverPlugin Class Reference

|  | Home · All Classes · Main Classes · Grouped Classes · Modules · Functions |

# QSqlDriverPlugin Class Reference
[QtSql module]

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

     #include <QSqlDriverPlugin>

Inherits QObject.

- List of all members, including inherited members

### Public Functions

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

- 29 public functions inherited from QObject

### Additional Inherited Members

- 1 property inherited from QObject
- 1 public slot inherited from QObject
- 1 signal inherited from QObject
- 5 static public members inherited from QObject
- 7 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 functions keys() and create(), and exporting the class with the Q_EXPORT_PLUGIN2() macro. See the SQL plugins that come with Qt for example implementations (in the `plugins/src/sqldrivers` subdirectory of the source distribution).

See also How to Create Qt Plugins.

## Member Function Documentation

### QSqlDriverPlugin::QSqlDriverPlugin ( QObject * parent = 0 )

Constructs a SQL driver plugin and sets the parent to parent. This is invoked automatically by the Q_EXPORT_PLUGIN2() macro.

### 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.

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

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.

See also keys().

### QStringList QSqlDriverPlugin::keys () const `[pure virtual]`

Returns the list of drivers (keys) this plugin supports.

These keys are usually the class names of the custom drivers that are implemented in the plugin.

See also create().