## GdaServerProvider GdaServerProvider — Base class for all the DBMS providers |

## Synopsis

                        GdaServerProvider;
                        GdaServerProviderClass;
    enum                GdaServerProviderError;
    #define             GDA_SERVER_PROVIDER_ERROR
                        GdaServerProviderMeta;
    void                (*GdaServerProviderAsyncCallback)   (GdaServerProvider *provider,
                                                             GdaConnection *cnc,
                                                             guint task_id,
                                                             gboolean result_status,
                                                             const GError *error,
                                                             gpointer data);
    void                (*GdaServerProviderExecCallback)    (GdaServerProvider *provider,
                                                             GdaConnection *cnc,
                                                             guint task_id,
                                                             GObject *result_obj,
                                                             const GError *error,
                                                             gpointer data);
    const gchar *       gda_server_provider_get_name        (GdaServerProvider *provider);
    const gchar *       gda_server_provider_get_version     (GdaServerProvider *provider);
    const gchar *       gda_server_provider_get_server_version
                                                            (GdaServerProvider *provider,
                                                             GdaConnection *cnc);
    gboolean            gda_server_provider_supports_operation
                                                            (GdaServerProvider *provider,
                                                             GdaConnection *cnc,
                                                             GdaServerOperationType type,
                                                             GdaSet *options);
    GdaServerOperation * gda_server_provider_create_operation
                                                            (GdaServerProvider *provider,
                                                             GdaConnection *cnc,
                                                             GdaServerOperationType type,
                                                             GdaSet *options,
                                                             GError **error);
    gchar *             gda_server_provider_render_operation
                                                            (GdaServerProvider *provider,
                                                             GdaConnection *cnc,
                                                             GdaServerOperation *op,
                                                             GError **error);
    gboolean            gda_server_provider_perform_operation
                                                            (GdaServerProvider *provider,
                                                             GdaConnection *cnc,
                                                             GdaServerOperation *op,
                                                             GError **error);
    GdaSqlParser *      gda_server_provider_create_parser   (GdaServerProvider *provider,
                                                             GdaConnection *cnc);
    gboolean            gda_server_provider_supports_feature
                                                            (GdaServerProvider *provider,
                                                             GdaConnection *cnc,
                                                             GdaConnectionFeature feature);
    GdaDataHandler *    gda_server_provider_get_data_handler_g_type
                                                            (GdaServerProvider *provider,
                                                             GdaConnection *cnc,
                                                             GType for_type);
    GdaDataHandler *    gda_server_provider_get_data_handler_dbms
                                                            (GdaServerProvider *provider,
                                                             GdaConnection *cnc,
                                                             const gchar *for_type);
    GValue *            gda_server_provider_string_to_value (GdaServerProvider *provider,
                                                             GdaConnection *cnc,
                                                             const gchar *string,
                                                             GType preferred_type,
                                                             gchar **dbms_type);
    gchar *             gda_server_provider_value_to_sql_string
                                                            (GdaServerProvider *provider,
                                                             GdaConnection *cnc,
                                                             GValue *from);
    const gchar *       gda_server_provider_get_default_dbms_type
                                                            (GdaServerProvider *provider,
                                                             GdaConnection *cnc,
                                                             GType type);
    gchar *             gda_server_provider_escape_string   (GdaServerProvider *provider,
                                                             GdaConnection *cnc,
                                                             const gchar *str);
    gchar *             gda_server_provider_unescape_string (GdaServerProvider *provider,
                                                             GdaConnection *cnc,
                                                             const gchar *str);

## Object Hierarchy

      GObject
       +----GdaServerProvider
             +----GdaSqliteProvider

## Description

The GdaServerProvider class is a virtual class which all the DBMS providers must inherit, and implement its virtual mathods.

See the Virtual methods for providers section for more information about how to implement the virtual methods.

## Details

### GdaServerProvider

    typedef struct _GdaServerProvider GdaServerProvider;

### GdaServerProviderClass

    typedef struct {
    	GObjectClass parent_class;

    	/* provider information */
    	GThread                 * limiting_thread; /* if not NULL, then using the provider will be limited to this thread */
    	const gchar           *(* get_name)              (GdaServerProvider *provider);
    	const gchar           *(* get_version)           (GdaServerProvider *provider);
    	const gchar           *(* get_server_version)    (GdaServerProvider *provider, GdaConnection *cnc);
    	gboolean               (* supports_feature)      (GdaServerProvider *provider, GdaConnection *cnc,
    							  GdaConnectionFeature feature);
    	/* types and values manipulation */
    	GdaDataHandler        *(* get_data_handler)      (GdaServerProvider *provider, GdaConnection *cnc,
    							  GType g_type, const gchar *dbms_type);
    	const gchar           *(*get_def_dbms_type)      (GdaServerProvider *provider, GdaConnection *cnc, GType g_type);
    	gchar                 *(*escape_string)          (GdaServerProvider *provider, GdaConnection *cnc, const gchar *str);
    	gchar                 *(*unescape_string)        (GdaServerProvider *provider, GdaConnection *cnc, const gchar *str);

    	/* connections management */
    	gboolean               (* open_connection)       (GdaServerProvider *provider, GdaConnection *cnc,
    							  GdaQuarkList *params, GdaQuarkList *auth,
    							  guint *task_id, GdaServerProviderAsyncCallback async_cb,
    							  gpointer cb_data);
    	gboolean               (* close_connection)      (GdaServerProvider *provider, GdaConnection *cnc);

    	const gchar           *(* get_database)          (GdaServerProvider *provider, GdaConnection *cnc);

    	/* operations */
    	gboolean               (* supports_operation)    (GdaServerProvider *provider, GdaConnection *cnc,
    							  GdaServerOperationType type, GdaSet *options);
    	GdaServerOperation    *(* create_operation)      (GdaServerProvider *provider, GdaConnection *cnc,
    							  GdaServerOperationType type, GdaSet *options, GError **error);
    	gchar                 *(* render_operation)      (GdaServerProvider *provider, GdaConnection *cnc,
    							  GdaServerOperation *op, GError **error);
    	gboolean               (* perform_operation)     (GdaServerProvider *provider, GdaConnection *cnc,
    							  GdaServerOperation *op,
    							  guint *task_id, GdaServerProviderAsyncCallback async_cb,
    							  gpointer cb_data, GError **error);

    	/* transactions */
    	gboolean                (* begin_transaction)    (GdaServerProvider *provider, GdaConnection *cnc,
    							  const gchar *name, GdaTransactionIsolation level, GError **error);
    	gboolean                (* commit_transaction)   (GdaServerProvider *provider, GdaConnection *cnc,
    							  const gchar *name, GError **error);
    	gboolean                (* rollback_transaction) (GdaServerProvider *provider, GdaConnection *cnc,
    							  const gchar *name, GError **error);
    	gboolean                (* add_savepoint)        (GdaServerProvider *provider, GdaConnection *cnc,
    							  const gchar *name, GError **error);
    	gboolean                (* rollback_savepoint)   (GdaServerProvider *provider, GdaConnection *cnc,
    							  const gchar *name, GError **error);
    	gboolean                (* delete_savepoint)     (GdaServerProvider *provider, GdaConnection *cnc,
    							  const gchar *name, GError **error);

    	/* GdaStatement */
    	GdaSqlParser           *(* create_parser)        (GdaServerProvider *provider, GdaConnection *cnc);
    	gchar                  *(* statement_to_sql)     (GdaServerProvider *provider, GdaConnection *cnc,
    							  GdaStatement *stmt, GdaSet *params, GdaStatementSqlFlag flags,
    							  GSList **params_used, GError **error);
    	gboolean                (* statement_prepare)    (GdaServerProvider *provider, GdaConnection *cnc,
    							  GdaStatement *stmt, GError **error);
    	GObject                *(* statement_execute)    (GdaServerProvider *provider, GdaConnection *cnc,
    							  GdaStatement *stmt, GdaSet *params,
    							  GdaStatementModelUsage model_usage,
    							  GType *col_types, GdaSet **last_inserted_row,
    							  guint *task_id, GdaServerProviderExecCallback exec_cb,
    							  gpointer cb_data, GError **error);

    	/* Misc */
    	gboolean                (* is_busy)              (GdaServerProvider *provider, GdaConnection *cnc, GError **error);
    	gboolean                (* cancel)               (GdaServerProvider *provider, GdaConnection *cnc,
    							  guint task_id, GError **error);
    	GdaConnection          *(* create_connection)    (GdaServerProvider *provider);

    	/* meta data reporting */
    	GdaServerProviderMeta      meta_funcs;

    	/* distributed transaction */
    	GdaServerProviderXa       *xa_funcs; /* it is a pointer! => set to %NULL if unsupported by provider */

    	/* SQL identifiers quoting */
    	gchar                  *(* identifier_quote)    (GdaServerProvider *provider, GdaConnection *cnc,
    							 const gchar *id,
    							 gboolean for_meta_store, gboolean force_quotes);

    	/* Padding for future expansion */
    	void                    (*_gda_reserved2)        (void);
    	void                    (*_gda_reserved3)        (void);
    	void                    (*_gda_reserved4)        (void);
    	void                    (*_gda_reserved5)        (void);
    	void                    (*_gda_reserved6)        (void);
    } GdaServerProviderClass;

### enum GdaServerProviderError

    typedef enum
    {
            GDA_SERVER_PROVIDER_METHOD_NON_IMPLEMENTED_ERROR,
    	GDA_SERVER_PROVIDER_PREPARE_STMT_ERROR,
    	GDA_SERVER_PROVIDER_EMPTY_STMT_ERROR,
    	GDA_SERVER_PROVIDER_MISSING_PARAM_ERROR,
    	GDA_SERVER_PROVIDER_STATEMENT_EXEC_ERROR,
    	GDA_SERVER_PROVIDER_OPERATION_ERROR,
    	GDA_SERVER_PROVIDER_INTERNAL_ERROR,
    	GDA_SERVER_PROVIDER_BUSY_ERROR,
    	GDA_SERVER_PROVIDER_NON_SUPPORTED_ERROR,
    	GDA_SERVER_PROVIDER_SERVER_VERSION_ERROR,
    	GDA_SERVER_PROVIDER_DATA_ERROR
    } GdaServerProviderError;

### GDA_SERVER_PROVIDER_ERROR

    #define GDA_SERVER_PROVIDER_ERROR gda_server_provider_error_quark ()

### GdaServerProviderMeta

    typedef struct {
    	/* _information_schema_catalog_name */
    	gboolean (*_info)            (GdaServerProvider *, GdaConnection *, GdaMetaStore *, GdaMetaContext *, GError **);

    	/* _builtin_data_types */
    	gboolean (*_btypes)          (GdaServerProvider *, GdaConnection *, GdaMetaStore *, GdaMetaContext *, GError **);

    	/* _udt */
    	gboolean (*_udt)             (GdaServerProvider *, GdaConnection *, GdaMetaStore *, GdaMetaContext *, GError **);
    	gboolean (*udt)              (GdaServerProvider *, GdaConnection *, GdaMetaStore *, GdaMetaContext *, GError **,
    				      const GValue *udt_catalog, const GValue *udt_schema);

    	/* _udt_columns */
    	gboolean (*_udt_cols)        (GdaServerProvider *, GdaConnection *, GdaMetaStore *, GdaMetaContext *, GError **);
    	gboolean (*udt_cols)         (GdaServerProvider *, GdaConnection *, GdaMetaStore *, GdaMetaContext *, GError **,
    				      const GValue *udt_catalog, const GValue *udt_schema, const GValue *udt_name);

    	/* _enums */
    	gboolean (*_enums)           (GdaServerProvider *, GdaConnection *, GdaMetaStore *, GdaMetaContext *, GError **);
    	gboolean (*enums)            (GdaServerProvider *, GdaConnection *, GdaMetaStore *, GdaMetaContext *, GError **,
    				      const GValue *udt_catalog, const GValue *udt_schema, const GValue *udt_name);

    	/* _domains */
    	gboolean (*_domains)         (GdaServerProvider *, GdaConnection *, GdaMetaStore *, GdaMetaContext *, GError **);
    	gboolean (*domains)          (GdaServerProvider *, GdaConnection *, GdaMetaStore *, GdaMetaContext *, GError **,
    				      const GValue *domain_catalog, const GValue *domain_schema);

    	/* _domain_constraints */
    	gboolean (*_constraints_dom) (GdaServerProvider *, GdaConnection *, GdaMetaStore *, GdaMetaContext *, GError **);
    	gboolean (*constraints_dom)  (GdaServerProvider *, GdaConnection *, GdaMetaStore *, GdaMetaContext *, GError **,
    				      const GValue *domain_catalog, const GValue *domain_schema, const GValue *domain_name);

    	/* _element_types */
    	gboolean (*_el_types)        (GdaServerProvider *, GdaConnection *, GdaMetaStore *, GdaMetaContext *, GError **);
    	gboolean (*el_types)         (GdaServerProvider *, GdaConnection *, GdaMetaStore *, GdaMetaContext *, GError **,
    				      const GValue *specific_name);

    	/* _collations */
    	gboolean (*_collations)       (GdaServerProvider *, GdaConnection *, GdaMetaStore *, GdaMetaContext *, GError **);
    	gboolean (*collations)        (GdaServerProvider *, GdaConnection *, GdaMetaStore *, GdaMetaContext *, GError **,
    				       const GValue *collation_catalog, const GValue *collation_schema,
    				       const GValue *collation_name_n);

    	/* _character_sets */
    	gboolean (*_character_sets)  (GdaServerProvider *, GdaConnection *, GdaMetaStore *, GdaMetaContext *, GError **);
    	gboolean (*character_sets)   (GdaServerProvider *, GdaConnection *, GdaMetaStore *, GdaMetaContext *, GError **,
    				      const GValue *chset_catalog, const GValue *chset_schema, const GValue *chset_name_n);

    	/* _schemata */
    	gboolean (*_schemata)        (GdaServerProvider *, GdaConnection *, GdaMetaStore *, GdaMetaContext *, GError **);
    	gboolean (*schemata)         (GdaServerProvider *, GdaConnection *, GdaMetaStore *, GdaMetaContext *, GError **,
    				      const GValue *catalog_name, const GValue *schema_name_n);

    	/* _tables or _views */
    	gboolean (*_tables_views)    (GdaServerProvider *, GdaConnection *, GdaMetaStore *, GdaMetaContext *, GError **);
    	gboolean (*tables_views)     (GdaServerProvider *, GdaConnection *, GdaMetaStore *, GdaMetaContext *, GError **,
    				      const GValue *table_catalog, const GValue *table_schema, const GValue *table_name_n);

    	/* _columns */
    	gboolean (*_columns)         (GdaServerProvider *, GdaConnection *, GdaMetaStore *, GdaMetaContext *, GError **);
    	gboolean (*columns)          (GdaServerProvider *, GdaConnection *, GdaMetaStore *, GdaMetaContext *, GError **,
    				      const GValue *table_catalog, const GValue *table_schema, const GValue *table_name);

    	/* _view_column_usage */
    	gboolean (*_view_cols)       (GdaServerProvider *, GdaConnection *, GdaMetaStore *, GdaMetaContext *, GError **);
    	gboolean (*view_cols)        (GdaServerProvider *, GdaConnection *, GdaMetaStore *, GdaMetaContext *, GError **,
    				      const GValue *view_catalog, const GValue *view_schema, const GValue *view_name);

    	/* _table_constraints */
    	gboolean (*_constraints_tab) (GdaServerProvider *, GdaConnection *, GdaMetaStore *, GdaMetaContext *, GError **);
    	gboolean (*constraints_tab)  (GdaServerProvider *, GdaConnection *, GdaMetaStore *, GdaMetaContext *, GError **,
    				      const GValue *table_catalog, const GValue *table_schema, const GValue *table_name,
    				      const GValue *constraint_name_n);

    	/* _referential_constraints */
    	gboolean (*_constraints_ref) (GdaServerProvider *, GdaConnection *, GdaMetaStore *, GdaMetaContext *, GError **);
    	gboolean (*constraints_ref)  (GdaServerProvider *, GdaConnection *, GdaMetaStore *, GdaMetaContext *, GError **,
    				      const GValue *table_catalog, const GValue *table_schema, const GValue *table_name,
    				      const GValue *constraint_name);

    	/* _key_column_usage */
    	gboolean (*_key_columns)     (GdaServerProvider *, GdaConnection *, GdaMetaStore *, GdaMetaContext *, GError **);
    	gboolean (*key_columns)      (GdaServerProvider *, GdaConnection *, GdaMetaStore *, GdaMetaContext *, GError **,
    				      const GValue *table_catalog, const GValue *table_schema, const GValue *table_name,
    				      const GValue *constraint_name);

    	/* _check_column_usage */
    	gboolean (*_check_columns)   (GdaServerProvider *, GdaConnection *, GdaMetaStore *, GdaMetaContext *, GError **);
    	gboolean (*check_columns)    (GdaServerProvider *, GdaConnection *, GdaMetaStore *, GdaMetaContext *, GError **,
    				      const GValue *table_catalog, const GValue *table_schema, const GValue *table_name,
    				      const GValue *constraint_name);

    	/* _triggers */
    	gboolean (*_triggers)        (GdaServerProvider *, GdaConnection *, GdaMetaStore *, GdaMetaContext *, GError **);
    	gboolean (*triggers)         (GdaServerProvider *, GdaConnection *, GdaMetaStore *, GdaMetaContext *, GError **,
    				      const GValue *table_catalog, const GValue *table_schema, const GValue *table_name);

    	/* _routines */
    	gboolean (*_routines)       (GdaServerProvider *, GdaConnection *, GdaMetaStore *, GdaMetaContext *, GError **);
    	gboolean (*routines)        (GdaServerProvider *, GdaConnection *, GdaMetaStore *, GdaMetaContext *, GError **,
    				     const GValue *routine_catalog, const GValue *routine_schema,
    				     const GValue *routine_name_n);

    	/* _routine_columns */
    	gboolean (*_routine_col)     (GdaServerProvider *, GdaConnection *, GdaMetaStore *, GdaMetaContext *, GError **);
    	gboolean (*routine_col)      (GdaServerProvider *, GdaConnection *, GdaMetaStore *, GdaMetaContext *, GError **,
    				      const GValue *rout_catalog, const GValue *rout_schema, const GValue *rout_name);

    	/* _parameters */
    	gboolean (*_routine_par)     (GdaServerProvider *, GdaConnection *, GdaMetaStore *, GdaMetaContext *, GError **);
    	gboolean (*routine_par)      (GdaServerProvider *, GdaConnection *, GdaMetaStore *, GdaMetaContext *, GError **,
    				      const GValue *rout_catalog, const GValue *rout_schema, const GValue *rout_name);

    	/* Padding for future expansion */
    	void (*_gda_reserved1) (void);
    	void (*_gda_reserved2) (void);
    	void (*_gda_reserved3) (void);
    	void (*_gda_reserved4) (void);
    	void (*_gda_reserved5) (void);
    	void (*_gda_reserved6) (void);
    	void (*_gda_reserved7) (void);
    	void (*_gda_reserved8) (void);
    	void (*_gda_reserved9) (void);
    	void (*_gda_reserved10) (void);
    	void (*_gda_reserved11) (void);
    	void (*_gda_reserved12) (void);
    	void (*_gda_reserved13) (void);
    	void (*_gda_reserved14) (void);
    	void (*_gda_reserved15) (void);
    	void (*_gda_reserved16) (void);
    } GdaServerProviderMeta;

These methods must be implemented by providers to update a connection's associated metadata (in a GdaMetaStore object), see the Virtual methods for providers/Methods - metadata for more information.

### GdaServerProviderAsyncCallback ()

    void                (*GdaServerProviderAsyncCallback)   (GdaServerProvider *provider,
                                                             GdaConnection *cnc,
                                                             guint task_id,
                                                             gboolean result_status,
                                                             const GError *error,
                                                             gpointer data);

Function to be called by Libgda when the associated asynchronous method invoked finishes.

`provider` : |
`cnc` : |
`task_id` : |
`result_status` : |
`error` : |
`data` : |

### GdaServerProviderExecCallback ()

    void                (*GdaServerProviderExecCallback)    (GdaServerProvider *provider,
                                                             GdaConnection *cnc,
                                                             guint task_id,
                                                             GObject *result_obj,
                                                             const GError *error,
                                                             gpointer data);

Function to be called by Libgda when the associated asynchronous method invoked finishes.

`provider` : |
`cnc` : |
`task_id` : |
`result_obj` : |
`error` : |
`data` : |

### gda_server_provider_get_name ()

    const gchar *       gda_server_provider_get_name        (GdaServerProvider *provider);

`provider` : |
Returns : |

### gda_server_provider_get_version ()

    const gchar *       gda_server_provider_get_version     (GdaServerProvider *provider);

Get the version of the provider.

`provider` : | a GdaServerProvider object.
Returns : | a string containing the version identification.

### gda_server_provider_get_server_version ()

    const gchar *       gda_server_provider_get_server_version
                                                            (GdaServerProvider *provider,
                                                             GdaConnection *cnc);

Get the version of the database to which the connection is opened.

`provider` : | a GdaServerProvider object.
`cnc` : | a GdaConnection object
Returns : | a (read only) string, or `NULL` if an error occurred

### gda_server_provider_supports_operation ()

    gboolean            gda_server_provider_supports_operation
                                                            (GdaServerProvider *provider,
                                                             GdaConnection *cnc,
                                                             GdaServerOperationType type,
                                                             GdaSet *options);

Tells if `provider` supports the `type` of operation on the `cnc` connection, using the (optional) `options` parameters.

`provider` : | a GdaServerProvider object
`cnc` : | a GdaConnection object which would be used to perform an action, or `NULL`
`type` : | the type of operation requested
`options` : | a list of named parameters, or `NULL`
Returns : | TRUE if the operation is supported

### gda_server_provider_create_operation ()

    GdaServerOperation * gda_server_provider_create_operation
                                                            (GdaServerProvider *provider,
                                                             GdaConnection *cnc,
                                                             GdaServerOperationType type,
                                                             GdaSet *options,
                                                             GError **error);

Creates a new GdaServerOperation object which can be modified in order to perform the `type` type of action. The `options` can contain:

- named values which ID is a path in the resulting GdaServerOperation object, to initialize some value
- named values which may change the contents of the GdaServerOperation, see this section for more information

`provider` : | a GdaServerProvider object
`cnc` : | a GdaConnection object which will be used to perform an action, or `NULL`
`type` : | the type of operation requested
`options` : | an optional list of parameters
`error` : | a place to store an error, or `NULL`
Returns : | a new GdaServerOperation object, or `NULL` in the provider does not support the `type` type of operation or if an error occurred

### gda_server_provider_render_operation ()

    gchar *             gda_server_provider_render_operation
                                                            (GdaServerProvider *provider,
                                                             GdaConnection *cnc,
                                                             GdaServerOperation *op,
                                                             GError **error);

Creates an SQL statement (possibly using some specific extensions of the DBMS) corresponding to the `op` operation. Note that the returned string may actually contain more than one SQL statement.

This function's purpose is mainly informative to get the actual SQL code which would be executed to perform the operation; to actually perform the operation, use `gda_server_provider_perform_operation()`.

`provider` : | a GdaServerProvider object
`cnc` : | a GdaConnection object which will be used to render the action, or `NULL`
`op` : | a GdaServerOperation object
`error` : | a place to store an error, or `NULL`
Returns : | a new string, or `NULL` if an error occurred or operation cannot be rendered as SQL.

### gda_server_provider_perform_operation ()

    gboolean            gda_server_provider_perform_operation
                                                            (GdaServerProvider *provider,
                                                             GdaConnection *cnc,
                                                             GdaServerOperation *op,
                                                             GError **error);

Performs the operation described by `op`. Note that `op` is not destroyed by this method and can be reused.

`provider` : | a GdaServerProvider object
`cnc` : | a GdaConnection object which will be used to perform the action, or `NULL`
`op` : | a GdaServerOperation object
`error` : | a place to store an error, or `NULL`
Returns : | TRUE if no error occurred

### gda_server_provider_create_parser ()

    GdaSqlParser *      gda_server_provider_create_parser   (GdaServerProvider *provider,
                                                             GdaConnection *cnc);

Creates a new GdaSqlParser object which is adapted to `provider` (and possibly depending on `cnc` for the actual database version).

If `prov` does not have its own parser, then `NULL` is returned, and a general SQL parser can be obtained using `gda_sql_parser_new()`.

`provider` : | a GdaServerProvider provider object
`cnc` : | a GdaConnection, or `NULL`
Returns : | a new GdaSqlParser object, or `NULL`.

### gda_server_provider_supports_feature ()

    gboolean            gda_server_provider_supports_feature
                                                            (GdaServerProvider *provider,
                                                             GdaConnection *cnc,
                                                             GdaConnectionFeature feature);

Tests if a feature is supported

`provider` : | a GdaServerProvider object
`cnc` : | a GdaConnection object, or `NULL`
`feature` : | GdaConnectionFeature feature to test
Returns : | TRUE if `feature` is supported

### gda_server_provider_get_data_handler_g_type ()

    GdaDataHandler *    gda_server_provider_get_data_handler_g_type
                                                            (GdaServerProvider *provider,
                                                             GdaConnection *cnc,
                                                             GType for_type);

Find a GdaDataHandler object to manipulate data of type `for_type`. The returned object must not be modified.

`provider` : | a server provider.
`cnc` : | a GdaConnection object, or `NULL`
`for_type` : | a GType
Returns : | a GdaDataHandler, or `NULL` if the provider does not support the requested `for_type` data type

### gda_server_provider_get_data_handler_dbms ()

    GdaDataHandler *    gda_server_provider_get_data_handler_dbms
                                                            (GdaServerProvider *provider,
                                                             GdaConnection *cnc,
                                                             const gchar *for_type);

Find a GdaDataHandler object to manipulate data of type `for_type`.

`provider` : | a server provider.
`cnc` : | a GdaConnection object, or `NULL`
`for_type` : | a DBMS type definition
Returns : | a GdaDataHandler, or `NULL` if the provider does not know about the `for_type` type

### gda_server_provider_string_to_value ()

    GValue *            gda_server_provider_string_to_value (GdaServerProvider *provider,
                                                             GdaConnection *cnc,
                                                             const gchar *string,
                                                             GType preferred_type,
                                                             gchar **dbms_type);

Use `provider` to create a new GValue from a single string representation.

The `preferred_type` can optionally ask `provider` to return a GValue of the requested type (but if such a value can't be created from `string`, then `NULL` is returned); pass G_TYPE_INVALID if any returned type is acceptable.

The returned value is either a new GValue or `NULL` in the following cases: - `string` cannot be converted to `preferred_type` type - the provider does not handle `preferred_type` - the provider could not make a GValue from `string`

If `dbms_type` is not `NULL`, then if will contain a constant string representing the database type used for the conversion if the conversion was successfull, or `NULL` otherwise.

`provider` : | a server provider.
`cnc` : | a GdaConnection object, or `NULL`
`string` : | the SQL string to convert to a value
`preferred_type` : | a GType, or G_TYPE_INVALID
`dbms_type` : | place to get the actual database type used if the conversion succeeded, or `NULL`
Returns : | a new GValue, or `NULL`

### gda_server_provider_value_to_sql_string ()

    gchar *             gda_server_provider_value_to_sql_string
                                                            (GdaServerProvider *provider,
                                                             GdaConnection *cnc,
                                                             GValue *from);

Produces a fully quoted and escaped string from a GValue

`provider` : | a server provider.
`cnc` : | a GdaConnection object, or `NULL`
`from` : | GValue to convert from
Returns : | escaped and quoted value or NULL if not supported.

### gda_server_provider_get_default_dbms_type ()

    const gchar *       gda_server_provider_get_default_dbms_type
                                                            (GdaServerProvider *provider,
                                                             GdaConnection *cnc,
                                                             GType type);

Get the name of the most common data type which has `type` type.

The returned value may be `NULL` either if the provider does not implement that method, or if there is no DBMS data type which could contain data of the `g_type` type (for example `NULL` may be returned if a DBMS has integers only up to 4 bytes and a G_TYPE_INT64 is requested).

`provider` : | a server provider.
`cnc` : | a GdaConnection object or `NULL`
`type` : | a GType value type
Returns : | the name of the DBMS type, or `NULL`

### gda_server_provider_escape_string ()

    gchar *             gda_server_provider_escape_string   (GdaServerProvider *provider,
                                                             GdaConnection *cnc,
                                                             const gchar *str);

Escapes `str` for use within an SQL command (to avoid SQL injection attacks). Note that the returned value still needs to be enclosed in single quotes before being used in an SQL statement.

`provider` : | a server provider.
`cnc` : | a GdaConnection object, or `NULL`
`str` : | a string to escape
Returns : | a new string suitable to use in SQL statements

### gda_server_provider_unescape_string ()

    gchar *             gda_server_provider_unescape_string (GdaServerProvider *provider,
                                                             GdaConnection *cnc,
                                                             const gchar *str);

Unescapes `str` for use within an SQL command. This is the exact opposite of `gda_server_provider_escape_string()`.

`provider` : | a server provider.
`cnc` : | a GdaConnection object, or `NULL`
`str` : | a string to escape
Returns : | a new string