GdaQueryField

GdaQueryField — Parent class for any query's field

Synopsis




                    GdaQueryField;
enum                GdaQueryFieldState;
GdaQueryField*      gda_query_field_new_from_xml        (GdaQuery *query,
                                                         xmlNodePtr node,
                                                         GError **error);
GdaQueryField*      gda_query_field_new_copy            (GdaQueryField *orig);
GdaQueryField*      gda_query_field_new_from_sql        (GdaQuery *query,
                                                         const gchar *sqlfield,
                                                         GError **error);
void                gda_query_field_set_alias           (GdaQueryField *qfield,
                                                         const gchar *alias);
const gchar*        gda_query_field_get_alias           (GdaQueryField *qfield);
void                gda_query_field_set_visible         (GdaQueryField *qfield,
                                                         gboolean visible);
gboolean            gda_query_field_is_visible          (GdaQueryField *qfield);
void                gda_query_field_set_internal        (GdaQueryField *qfield,
                                                         gboolean internal);
gboolean            gda_query_field_is_internal         (GdaQueryField *qfield);
GdaDictType*        gda_query_field_get_dict_type       (GdaQueryField *qfield);
GSList*             gda_query_field_get_parameters      (GdaQueryField *qfield);
gboolean            gda_query_field_is_equal            (GdaQueryField *qfield1,
                                                         GdaQueryField *qfield2);
gboolean            gda_query_field_is_list             (GdaQueryField *qfield);

Object Hierarchy


  GObject
   +----GdaObject
         +----GdaQueryObject
               +----GdaQueryField
                     +----GdaQueryFieldAgg
                     +----GdaQueryFieldAll
                     +----GdaQueryFieldField
                     +----GdaQueryFieldFunc
                     +----GdaQueryFieldValue

Description

Details

GdaQueryField

typedef struct _GdaQueryField GdaQueryField;


enum GdaQueryFieldState

typedef enum {
	GDA_ENTITY_FIELD_VISIBLE   = 1 << 0,
	GDA_ENTITY_FIELD_INVISIBLE = 1 << 1,
	GDA_ENTITY_FIELD_ANY       = GDA_ENTITY_FIELD_VISIBLE | GDA_ENTITY_FIELD_INVISIBLE
} GdaQueryFieldState;


gda_query_field_new_from_xml ()

GdaQueryField*      gda_query_field_new_from_xml        (GdaQuery *query,
                                                         xmlNodePtr node,
                                                         GError **error);

This is an object factory which does create instances of class inheritants of the GnomeDbDfield class. Ths GdaQueryField object MUST then be attached to query

query : a GdaQuery object
node : an XML node corresponding to a GDA_QUERY_FIELD tag
error : location to store error, or NULL
Returns : the newly created object

gda_query_field_new_copy ()

GdaQueryField*      gda_query_field_new_copy            (GdaQueryField *orig);

This is a copy constructor

orig : a GdaQueryField to copy
Returns : the new object

gda_query_field_new_from_sql ()

GdaQueryField*      gda_query_field_new_from_sql        (GdaQuery *query,
                                                         const gchar *sqlfield,
                                                         GError **error);

Creates a new GdaQueryField from its SQL representation

query : a GdaQuery object
sqlfield : a SQL statement representing a query field
error : location to store error, or NULL
Returns : a new GdaQueryField object, or NULL if an error occurred

gda_query_field_set_alias ()

void                gda_query_field_set_alias           (GdaQueryField *qfield,
                                                         const gchar *alias);

Sets qfield's alias

qfield : a GdaQueryField object
alias : the alias to set qfield to

gda_query_field_get_alias ()

const gchar*        gda_query_field_get_alias           (GdaQueryField *qfield);

Get qfield's alias

qfield : a GdaQueryField object
Returns : the alias

gda_query_field_set_visible ()

void                gda_query_field_set_visible         (GdaQueryField *qfield,
                                                         gboolean visible);

Sets the visibility of qfield. A visible field will appear in the query's corresponding (virtual) entity, whereas a non visible one will be hidden (and possibly not taking part in the query).

qfield : a GdaQueryField object
visible :

gda_query_field_is_visible ()

gboolean            gda_query_field_is_visible          (GdaQueryField *qfield);

qfield : a GdaQueryField object
Returns : TRUE if field is visible

gda_query_field_set_internal ()

void                gda_query_field_set_internal        (GdaQueryField *qfield,
                                                         gboolean internal);

Sets weather qfield is internal or not. Internal fields in a query are fields added or changed by libgnomedb itself, such fields may or may not be visible.

qfield : a GdaQueryField object
internal :

gda_query_field_is_internal ()

gboolean            gda_query_field_is_internal         (GdaQueryField *qfield);

qfield : a GdaQueryField object
Returns : TRUE if field is internal

gda_query_field_get_dict_type ()

GdaDictType*        gda_query_field_get_dict_type       (GdaQueryField *qfield);

Get the GdaDictType represented by the qfield object: for a function it returns the return type, for a value, it returns its type, etc.

qfield : a GdaQueryField object
Returns : the data type, or NULL if qfield does not have a data type.

gda_query_field_get_parameters ()

GSList*             gda_query_field_get_parameters      (GdaQueryField *qfield);

Get a list of all the parameters needed to qfield to be rendered as a valid statement

qfield : a GdaQueryField object
Returns : a new list of parameters for qfield

gda_query_field_is_equal ()

gboolean            gda_query_field_is_equal            (GdaQueryField *qfield1,
                                                         GdaQueryField *qfield2);

Compares the qfield1 and qfield2. The name and aliases of the two fields are not compared, only the contents of the fields are.

qfield1 : a GdaQueryField object
qfield2 : a GdaQueryField object
Returns : TRUE if they are equal and FALSE otherwise

gda_query_field_is_list ()

gboolean            gda_query_field_is_list             (GdaQueryField *qfield);

Tells if qfield can potentially represent a list of values.

qfield : a GdaQueryField object
Returns : TRUE if field can be a list of values