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support_functions [2012/08/25 07:54] – [tag_path(int): extract the tag name with its hierarchy] danielsupport_functions [2018/04/20 11:17] (current) – Add child_tags daniel
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 <code> SELECT tag_id,tag_path(tag_id) FROM tags ORDER BY 2</code> <code> SELECT tag_id,tag_path(tag_id) FROM tags ORDER BY 2</code>
 will retrieve all tags sorted and formatted as in the "Current messsages" tree in the Quick selection panel of the user interface. will retrieve all tags sorted and formatted as in the "Current messsages" tree in the Quick selection panel of the user interface.
-====== tag_depth(int): returns the depth of a tag inside its hierarchy ======+ 
 + 
 +====== tag_depth(int)  ====== 
 +**Returns the depth of a tag inside its hierarchy**. \\
 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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 </file> </file>
  
-====== tag_id(text): returns the ID of a tag from its full hierarchical name (case insensitive) ======+====== tag_id(text) ====== 
 +**Returns the ID of a tag from its full hierarchical name (case insensitive).** \\
 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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 </file> </file>
  
-====== get_header_line(): extracts entries from a mail header ======+====== child_tags(int) ====== 
 +**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 $$ 
 +WITH RECURSIVE tagr(_tag_id) as ( 
 + select tag_id 
 + from tags where parent_id is not distinct from top_id 
 +UNION ALL 
 + select 
 +   tag_id 
 + FROM tags JOIN tagr ON tagr._tag_id=tags.parent_id 
 +) 
 +select _tag_id FROM tagr; 
 +$$ language sql stable 
 +</file> 
 + 
 +====== 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, text) RETURNS SETOF text CREATE FUNCTION get_header_line(int, text) RETURNS SETOF text
 AS $$ AS $$
- SELECT (regexp_matches(lines, E'^'||$2||': (.*?)$', 'gni'))[1]+ SELECT (regexp_matches(lines, '^'||$2||': (.*?)$', 'gni'))[1]
    FROM header WHERE mail_id=$1;    FROM header WHERE mail_id=$1;
 $$ LANGUAGE sql; $$ LANGUAGE sql;
  
 </file> </file>
support_functions.1345881271.txt.gz · Last modified: 2012/08/25 07:54 by daniel