support_functions
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support_functions [2012/08/25 07:54] – [tag_path(int): extract the tag name with its hierarchy] daniel | support_functions [2018/04/20 11:17] (current) – Add child_tags daniel | ||
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< | < | ||
will retrieve all tags sorted and formatted as in the " | will retrieve all tags sorted and formatted as in the " | ||
- | ====== tag_depth(int): returns | + | |
+ | |||
+ | ====== tag_depth(int) | ||
+ | **Returns | ||
This recursive function takes the ID of a tag and returns its depth inside its hierarchy, starting by 1 for top-level tags. | This recursive function takes the ID of a tag and returns its depth inside its hierarchy, starting by 1 for top-level tags. | ||
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</ | </ | ||
- | ====== tag_id(text): returns | + | ====== tag_id(text) |
+ | **Returns | ||
This is the inverse function of tag_path(int). | This is the inverse function of tag_path(int). | ||
If the name is not found, it returns null. | If the name is not found, it returns null. | ||
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</ | </ | ||
- | ====== | + | ====== |
+ | **Return all childs of a tag.** \\ | ||
+ | Takes the ID of a tag or null to designate the root of all tags. Returns | ||
+ | the set of child tags. | ||
+ | |||
+ | <file sql child_tags.sql> | ||
+ | create function child_tags(top_id integer) returns setof integer | ||
+ | as $$ | ||
+ | WITH RECURSIVE tagr(_tag_id) as ( | ||
+ | | ||
+ | from tags where parent_id is not distinct from top_id | ||
+ | UNION ALL | ||
+ | | ||
+ | | ||
+ | FROM tags JOIN tagr ON tagr._tag_id=tags.parent_id | ||
+ | ) | ||
+ | select _tag_id FROM tagr; | ||
+ | $$ language sql stable | ||
+ | </ | ||
+ | |||
+ | ====== get_header_line() ====== | ||
+ | **Extract entries from a mail header.** \\ | ||
This function takes a mail_id and the name of a header field and returns all corresponding header entries for this message. | This function takes a mail_id and the name of a header field and returns all corresponding header entries for this message. | ||
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CREATE FUNCTION get_header_line(int, | CREATE FUNCTION get_header_line(int, | ||
AS $$ | AS $$ | ||
- | | + | |
FROM header WHERE mail_id=$1; | FROM header WHERE mail_id=$1; | ||
$$ LANGUAGE sql; | $$ LANGUAGE sql; | ||
</ | </ |
support_functions.1345881271.txt.gz · Last modified: 2012/08/25 07:54 by daniel