GNOME Data Access 5 manual: GdaVirtualConnection

## GdaVirtualConnection GdaVirtualConnection — Base class for all virtual connection objects |

## Stability Level

Stable, unless otherwise indicated

## Functions

GdaConnection * | gda_virtual_connection_open ()
GdaConnection * | gda_virtual_connection_open_extended ()
void | gda_virtual_connection_internal_set_provider_data ()
gpointer | gda_virtual_connection_internal_get_provider_data ()

## Types and Values

struct | GdaVirtualConnection

## Object Hierarchy

        GObject
        ╰── GdaConnection
            ╰── GdaVirtualConnection
                ╰── GdaVconnectionDataModel

## Implemented Interfaces

GdaVirtualConnection implements GdaLockable.

## Description

This is a base virtual class for all virtual connection implementations.

## Functions

### gda_virtual_connection_open ()

    GdaConnection *
    gda_virtual_connection_open (GdaVirtualProvider *virtual_provider,
                                 GError **error);

Creates and opens a new virtual connection using the `virtual_provider` provider. The returned value is a new GdaVirtualConnection which needs to be used to actually add some contents to the virtual connection.

#### Parameters

virtual_provider | a GdaVirtualProvider object |
error | a place to store errors, or `NULL` |

#### Returns

a new GdaConnection object, or `NULL` if an error occurred

### gda_virtual_connection_open_extended ()

    GdaConnection *
    gda_virtual_connection_open_extended (GdaVirtualProvider *virtual_provider,
                                          GdaConnectionOptions options,
                                          GError **error);

Creates and opens a new virtual connection using the `virtual_provider` provider. If `options` contains the `GDA_CONNECTION_OPTIONS_THREAD_ISOLATED` flag, then the returned connection will be a thread wrapped connection, and the actual (wrapped) virtual connection can be obtained through the "gda-virtual-connection" user property (use `g_object_get_data()` to get it).

The returned value is a new GdaVirtualConnection which needs to be used to actually add some contents to the virtual connection.

#### Parameters

virtual_provider | a GdaVirtualProvider object |
options | a set of options to specify the new connection |
error | a place to store errors, or `NULL` |

#### Returns

a new GdaConnection object, or `NULL` if an error occurred

### gda_virtual_connection_internal_set_provider_data ()

    void
    gda_virtual_connection_internal_set_provider_data
                                   (GdaVirtualConnection *vcnc,
                                    gpointer data,
                                    GDestroyNotify destroy_func);

Note: calling this function more than once will not make it call `destroy_func` on any previously set opaque `data` , you'll have to do it yourself.

#### Parameters

vcnc | a GdaConnection object |
data | an opaque structure, known only to the provider for which `vcnc` is opened |
destroy_func | function to call when the connection closes and `data` needs to be destroyed |

### gda_virtual_connection_internal_get_provider_data ()

    gpointer
    gda_virtual_connection_internal_get_provider_data
                                   (GdaVirtualConnection *vcnc);

Get the opaque pointer previously set using `gda_virtual_connection_internal_set_provider_data()`. If it's not set, then add a connection event and returns `NULL`

#### Parameters

vcnc | a GdaConnection object |

#### Returns

the pointer to the opaque structure set using `gda_virtual_connection_internal_set_provider_data()`

## Types and Values

### struct GdaVirtualConnection

    struct GdaVirtualConnection;