Configuration

Configuration — Access/Management of libgda configuration

Stability Level

Stable, unless otherwise indicated

Properties

gchar * system-filename Read / Write
gchar * user-filename Read / Write

Signals

void dsn-added Run First
void dsn-changed Run First
void dsn-removed Run First
void dsn-to-be-removed Run First

Types and Values

Object Hierarchy

    GObject
    ╰── GdaConfig

Description

The functions in this section allow applications an easy access to libgda's configuration (the list of data sources and database providers).

As soon as a GdaConfig is needed (for example when requesting information about a data source or about a server provider), a single instance object is created, and no other will need to be created. A pointer to this object can be obtained with

gda_config_get(). Of course one can (right after having called gda_init()) force the creation of a GdaConfig object with some

specific properties set, using a simple call like:

g_object_new (GDA_TYPE_CONFIG, "user-filename", "my_file", NULL);

Please note that after that call, the caller has a reference to the newly created object, and should technically call g_object_unref() when finished using it. It is safe to do this but also pointless since that object should not be destroyed (as no other will be created) as Libgda also keeps a reference for itself.

Data sources are defined in a per-user configuration file which is by default ${HOME}/.libgda/config and in a system wide configuration file which is by default ${prefix}/etc/libgda-4.0/config. Those filenames can be modified by setting the user-file and

system-file properties for the single GdaConfig

instance. Note that setting either of these properties to NULL will disable using the corresponding configuration file (DSN will exist only in memory and their definition will be lost when the application finishes).

The GdaConfig object implements its own locking mechanism so it is thread-safe.

Note about localization: when the GdaConfig loads configuration files, it filters the contents based on the current locale, so for example if your current locale is "de" then all the loaded strings (for the ones which are translated) will be in the German language. Changing the locale afterwards will have no effect on the GdaConfig and the already loaded configuration. The consequence is that you should first call setlocale() youself in your code before using a GdaConfig object. As a side note you should also call gtk_init() before gdaui_init() because gtk_init() calls setlocale().

Functions

gda_config_get_dsn_info ()

GdaDsnInfo *
gda_config_get_dsn_info (const gchar *dsn_name);

Get information about the DSN named dsn_name .

dsn_name 's format is "[<username>[:<password>]@]<DSN>" (if <username> and optionally <password> are provided, they are ignored). Also see the gda_dsn_split() utility function.

Parameters

dsn_name

the name of the DSN to look for

 

Returns

a pointer to read-only GdaDsnInfo structure, or NULL if not found.

[transfer none]


gda_config_define_dsn ()

gboolean
gda_config_define_dsn (const GdaDsnInfo *info,
                       GError **error);

Add or update a DSN from the definition in info .

This method may fail with a GDA_CONFIG_ERROR domain error (see the GdaConfigError error codes).

Parameters

info

a pointer to a filled GdaDsnInfo structure

 

error

a place to store errors, or NULL

 

Returns

TRUE if no error occurred


gda_config_remove_dsn ()

gboolean
gda_config_remove_dsn (const gchar *dsn_name,
                       GError **error);

Remove the DSN named dsn_name .

This method may fail with a GDA_CONFIG_ERROR domain error (see the GdaConfigError error codes).

Parameters

dsn_name

the name of the DSN to remove

 

error

a place to store errors, or NULL

 

Returns

TRUE if no error occurred


gda_config_dsn_needs_authentication ()

gboolean
gda_config_dsn_needs_authentication (const gchar *dsn_name);

Tells if the data source identified as dsn_name needs any authentication. If a <username> and optionally a <password> are specified, they are ignored.

Parameters

dsn_name

the name of a DSN, in the "[<username>[:<password>]@]<DSN>" format

 

Returns

TRUE if an authentication is needed


gda_config_list_dsn ()

GdaDataModel *
gda_config_list_dsn (void);

Get a GdaDataModel representing all the configured DSN, and keeping itself up to date with the changes in the declared DSN.

The returned data model is composed of the following columns:

  • DSN name

  • Provider name

  • Description

  • Connection string

  • Username if it exists

Returns

a new GdaDataModel.

[transfer full]


gda_config_get_nb_dsn ()

gint
gda_config_get_nb_dsn (void);

Get the number of defined DSN

Returns

the number of defined DSN


gda_config_get_dsn_info_index ()

gint
gda_config_get_dsn_info_index (const gchar *dsn_name);

Get the index (starting at 0) of the DSN named dsn_name

Parameters

dsn_name

a DSN

 

Returns

the index or -1 if not found


gda_config_get_dsn_info_at_index ()

GdaDsnInfo *
gda_config_get_dsn_info_at_index (gint index);

Get a pointer to a read-only GdaDsnInfo at the index position

Parameters

index

an index

 

Returns

the pointer or NULL if no DSN exists at position index .

[transfer none]


gda_config_can_modify_system_config ()

gboolean
gda_config_can_modify_system_config (void);

Tells if the global (system) configuration can be modified (considering system permissions and settings)

Returns

TRUE if system-wide configuration can be modified


gda_config_get_provider_info ()

GdaProviderInfo *
gda_config_get_provider_info (const gchar *provider_name);

Get some information about the a database provider (adapter) named

Parameters

provider_name

a database provider

 

Returns

a pointer to read-only GdaProviderInfo structure, or NULL if not found.

[transfer none]


gda_config_get_provider ()

GdaServerProvider *
gda_config_get_provider (const gchar *provider_name,
                         GError **error);

Get a pointer to the session-wide GdaServerProvider for the provider named provider_name . The caller must not call g_object_unref() on the returned object.

This method may fail with a GDA_CONFIG_ERROR domain error (see the GdaConfigError error codes).

Parameters

provider_name

a database provider

 

error

a place to store errors, or NULL

 

Returns

a pointer to the GdaServerProvider, or NULL if an error occurred.

[transfer none]


gda_config_list_providers ()

GdaDataModel *
gda_config_list_providers (void);

Get a GdaDataModel representing all the installed database providers.

The returned data model is composed of the following columns:

  • Provider name

  • Description

  • DSN parameters

  • Authentication parameters

  • File name of the plugin

Returns

a new GdaDataModel.

[transfer full]


gda_config_get ()

GdaConfig *
gda_config_get (void);

Get a pointer to the global (unique) GdaConfig object. This functions increments the reference count of the object, so you need to call g_object_unref() on it once finished.

Returns

a non NULL pointer to the unique GdaConfig.

[transfer full]

Types and Values

GdaConfig

typedef struct _GdaConfig GdaConfig;

struct GdaDsnInfo

struct GdaDsnInfo {
        gchar    *name;
        gchar    *provider;
        gchar    *description;
        gchar    *cnc_string;
        gchar    *auth_string;
        gboolean  is_system;
};

This structure defines the properties of a named data source (DSN).

Members

gchar *name;

the (unique) name of the DSN (plain text, not RFC 1738 encoded)

 

gchar *provider;

the ID of the database provider to be used (plain text, not RFC 1738 encoded)

 

gchar *description;

a descriptive string (plain text, not RFC 1738 encoded), can be NULL.

 

gchar *cnc_string;

the connection string, a semi-colon separated <key>=<value> list where <key> and <value> are RFC 1738 encoded

 

gchar *auth_string;

the authentication string, a semi-colon separated <key>=<value> list where <key> and <value> are RFC 1738 encoded. Can be NULL.

 

gboolean is_system;

TRUE if the DSN is a system wide defined data source

 

struct GdaProviderInfo

struct GdaProviderInfo {
        gchar             *id;
        gchar             *location;
        gchar             *description;
        GdaSet            *dsn_params;  /* Specs to create a DSN */
	GdaSet            *auth_params; /* Specs to authenticate a client */
};

This structure holds the information associated to a database provider as discovered by Libgda.

Members

gchar *id;

the unique identifier of the database provider

 

gchar *location;

the complete path to the shared library implementing the database provider

 

gchar *description;

provider's description

 

GdaSet *dsn_params;

a GdaSet containing all the parameters which can/must be specified when opening a connection or defining a named data source (DSN)

 

GdaSet *auth_params;

a GdaSet containing all the authentication parameters

 

Property Details

The “system-filename” property

  “system-filename”          gchar *

File to use for system-wide DSN list. When changed, the whole list of DSN will be reloaded.

Flags: Read / Write

Default value: NULL


The “user-filename” property

  “user-filename”            gchar *

File to use for per-user DSN list. When changed, the whole list of DSN will be reloaded.

Flags: Read / Write

Default value: NULL

Signal Details

The “dsn-added” signal

void
user_function (GdaConfig *conf,
               gpointer   new_dsn,
               gpointer   user_data)

Gets emitted whenever a new DSN has been defined

Parameters

conf

the GdaConfig object

 

new_dsn

a GdaDsnInfo

 

user_data

user data set when the signal handler was connected.

 

Flags: Run First


The “dsn-changed” signal

void
user_function (GdaConfig *conf,
               gpointer   dsn,
               gpointer   user_data)

Gets emitted whenever a DSN's definition has been changed

Parameters

conf

the GdaConfig object

 

dsn

a GdaDsnInfo

 

user_data

user data set when the signal handler was connected.

 

Flags: Run First


The “dsn-removed” signal

void
user_function (GdaConfig *conf,
               gpointer   old_dsn,
               gpointer   user_data)

Gets emitted whenever a DSN has been removed

Parameters

conf

the GdaConfig object

 

old_dsn

a GdaDsnInfo

 

user_data

user data set when the signal handler was connected.

 

Flags: Run First


The “dsn-to-be-removed” signal

void
user_function (GdaConfig *conf,
               gpointer   old_dsn,
               gpointer   user_data)

Gets emitted whenever a DSN is about to be removed

Parameters

conf

the GdaConfig object

 

old_dsn

a GdaDsnInfo

 

user_data

user data set when the signal handler was connected.

 

Flags: Run First