Relation

A glib.relation.Relation is a table of data which can be indexed on any number of fields, rather like simple database tables. A glib.relation.Relation contains a number of records, called tuples. Each record contains a number of fields. Records are not ordered, so it is not possible to find the record at a particular index.

Note that glib.relation.Relation tables are currently limited to 2 fields.

To create a glib.relation.Relation, use glib.relation.Relation.new_.

To specify which fields should be indexed, use glib.relation.Relation.index. Note that this must be called before any tuples are added to the glib.relation.Relation.

To add records to a glib.relation.Relation use glib.relation.Relation.insert.

To determine if a given record appears in a glib.relation.Relation, use glib.relation.Relation.exists. Note that fields are compared directly, so pointers must point to the exact same position (i.e. different copies of the same string will not match.)

To count the number of records which have a particular value in a given field, use glib.relation.Relation.count.

To get all the records which have a particular value in a given field, use glib.relation.Relation.select. To access fields of the resulting records, use glib.tuples.Tuples.index. To free the resulting records use glib.tuples.Tuples.destroy.

To delete all records which have a particular value in a given field, use glib.relation.Relation.delete_.

To destroy the glib.relation.Relation, use glib.relation.Relation.destroy.

To help debug glib.relation.Relation objects, use glib.relation.Relation.print.

glib.relation.Relation has been marked as deprecated, since this API has never been fully implemented, is not very actively maintained and rarely used.

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class Relation {

GRelation* cInstancePtr;

bool owned;

int count(const(void)* key, int field);

int delete_(const(void)* key, int field);

void destroy();

void print();

}

Members

Functions

count int count(const(void)* key, int field): Returns the number of tuples in a #GRelation that have the given value in the given field.
delete_ int delete_(const(void)* key, int field): Deletes any records from a #GRelation that have the given key value in the given field.
destroy void destroy(): Destroys the #GRelation, freeing all memory allocated. However, it does not free memory allocated for the tuple data, so you should free that first if appropriate.
print void print(): Outputs information about all records in a #GRelation, as well as the indexes. It is for debugging.

Detailed Description

Deprecated: Rarely used API

glib relation classes

Relation