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mnoGoSearch 3.3.12 reference manual: Full-featured search engine software
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UserScore

Name

UserScore -- specifies an SQL query to calculate user defined score for desired documents.

search.htm

indexer.conf

Synopsis

UserScore {name} {sql-query}

Description

The UserScore command allows to configure user defined scores for some or all documents in the database. The score value calculated by mnoGoSearch is mixed with the user defined value, so you can affect the final rank for desired documents.

It is possible to configure multiple UserScore commands, however only one of them can be used during search time. The name argument should be unique in every UserScore command. search.cgi detects which UserScore command to use taking its name from the us=name1 HTML form parameter. If no us parameter is given, or us value is empty, non of the UserScore commands are applied.

The second argument must represent an SQL query returning a result set consisting of two columns. The first column in each record should correspond to ID of a document whose score should be modified.

Note: The document IDs are stored in the rec_id column of the url table of the mnoGoSearch database. To know the ID of a certain document you can run this SQL query in the mnoGoSearch database:


SELECT rec_id FROM url WHERE url='http://hostname/page1.html';
    

The second column stands for a user defined score value for this document, returned as signed integer in the range -255..+255. The original score value calculated by mnoGoSearch is mixed with the user defined value as follows:

If the UserScore command is specified in search.htm, then the SQL query is executed during search time. This mode can be recommended for a simple UserScore SQL query with a small number of records returned.

When you have a complex UserScore SQL query (which needs time for its execution and/or returns a large result set), then is it's possible to specify the UserScore command in indexer.conf instead. In this case the SQL query is evaluated only during indexer -Eblob or indexer -Erewritelimits time, and its result is cached in the database. At search time search.cgi loads the cached result from the database.

Examples


# Give more score to documents with longer URL
UserScore long "SELECT rec_id, length(url) FROM url"

# Give more score to documents with shorter URL
UserScore short "SELECT rec_id, -length(url) FROM url"

# Give higher scores to some certain documents:
UserScore list1 "SELECT rec_id, 255 FROM url WHERE rec_id IN (1,100,300)"
    

See also

Limit, UserScoreFactor, UserSiteScore, the Section called Search parameters in Chapter 10.