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Libmergeant Reference Manual | ![]() |
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MgDbField; GObject* mg_db_field_new (MgConf *conf, MgServerDataType *type); void mg_db_field_set_length (MgDbField *field, gint length); gint mg_db_field_get_length (MgDbField *field); void mg_db_field_set_scale (MgDbField *field, gint length); gint mg_db_field_get_scale (MgDbField *field); GSList* mg_db_field_get_constraints (MgDbField *field); void mg_db_field_set_data_type (MgDbField *field, MgServerDataType *type); void mg_db_field_set_default_value (MgDbField *field, const GdaValue *value); const GdaValue* mg_db_field_get_default_value (MgDbField *field); gboolean mg_db_field_is_null_allowed (MgDbField *field); gboolean mg_db_field_is_pkey_part (MgDbField *field); gboolean mg_db_field_is_pkey_alone (MgDbField *field); gboolean mg_db_field_is_fkey_part (MgDbField *field); gboolean mg_db_field_is_fkey_alone (MgDbField *field);
GObject* mg_db_field_new (MgConf *conf, MgServerDataType *type);
Creates a new MgDbField object
conf : |
a MgConf object |
type : |
a MgServerDataType object (the field's type) |
Returns : | the new object |
void mg_db_field_set_length (MgDbField *field, gint length);
field : |
|
length : |
gint mg_db_field_get_length (MgDbField *field);
Get the length of a field.
field : |
a MgDbField object |
Returns : | the size of the corresponding data type has a fixed size, or -1 |
void mg_db_field_set_scale (MgDbField *field, gint length);
field : |
|
length : |
gint mg_db_field_get_scale (MgDbField *field);
Get the scale of a field.
field : |
a MgDbField object |
Returns : | the size of the corresponding data type has a fixed size, or -1 |
GSList* mg_db_field_get_constraints (MgDbField *field);
Get all the constraints which impact the given field. Constraints are of several type: NOT NULL, primary key, foreign key, check constrains
field : |
a MgDbField object |
Returns : | a new list of MgDbConstraint objects |
void mg_db_field_set_data_type (MgDbField *field, MgServerDataType *type);
Sets the data type of the field
field : |
a MgDbField object |
type : |
a MgServerDataType object |
void mg_db_field_set_default_value (MgDbField *field, const GdaValue *value);
Sets (or replace) the default value for the field. WARNING: the default value's data type can be different from the field's data type (this is the case for example if the default value is a function like Postgres's default value for the SERIAL data type).
field : |
a MgDbField object |
value : |
a GdaValue value or NULL |
const GdaValue* mg_db_field_get_default_value (MgDbField *field);
Get the default value for the field if ne exists
field : |
a MgDbField object |
Returns : | the default value |
gboolean mg_db_field_is_null_allowed (MgDbField *field);
field : |
|
Returns : |
gboolean mg_db_field_is_pkey_alone (MgDbField *field);
field : |
|
Returns : |
gboolean mg_db_field_is_fkey_alone (MgDbField *field);
field : |
|
Returns : |
void user_function (MgDbField *mgdbfield, gpointer user_data) : Run first
mgdbfield : |
the object which received the signal. |
user_data : |
user data set when the signal handler was connected. |