The GdaServerProvider class

The GdaServerProvider(3) is the class you should implement for adding a new provider. This class is just a typical GObject-based class, with a set of virtual methods, that are the ones that you must implement. These virtual methods are declared in the class structure, in the gda-server-provider.h file. They are explained in detail in the following subsections.


open_connection

Sets up the connection to the database back-end using the parameters received as arguments and returns a boolean TRUE if the connection is successfully established, otherwise FALSE.


close_connection

Frees the resources allocated for the connection and returns TRUE if everything is ok


get_database

Returns the name of the currently open database for a given connection.


change_database

Change the database being used in the active connection.


create_database

Creates a new database whose name is received in a parameter.


drop_database

Drops an existing database whose name is received in a parameter.


execute_command

Executes a command and returns a GList of GdaDataModel(3) with the results.


begin_transaction

Initiates a transaction if the DB back-end supports transactions.


commit_transaction

Commits a transaction if the DB back-end supports transactions.


rollback_transaction

Rollback a transaction if the DB back-end supports transactions.


supports

Tests if a given feature is supported by the provider and the DB back-end. You can view the list of features in gda-connection.h, enumeration GdaConnectionFeature.


get_schema

Returns a GdaDataModel(3) with the schema information requested. You can view the list of features in gda-connection.h, enumeration GdaConnectionSchema. This schema information is what describes the objects in the database, and is the way applications can manage the structure of several database systems without knowing anything about their specific way of retrieving this information.

The get_schema virtual method gets a GdaConnectionSchema argument, which describes the kind of schema the client making the call is interested in, along with a GdaParameterList argument, which contains the list of arguments sent by the user to explicitly provide more information for the search.

The information to be returned for each schema, along with the supported parameters, is described in the following table.

Table 1. Standard Schema and supported parameters