Difference between revisions of "Semantic MediaWiki/data/smw object ids"

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(updated highlight tags; latest schema)
(title lookup SQL)
Line 18: Line 18:
 
) ENGINE=InnoDB CHARSET=binary;
 
) ENGINE=InnoDB CHARSET=binary;
 
</syntaxhighlight>
 
</syntaxhighlight>
−
===Example===
+
===Examples===
−
<syntaxhighlight lang=mysql>SELECT  
+
Showing the blob values:
 +
<source lang=mysql>SELECT  
 
     smw_id,
 
     smw_id,
 
     smw_namespace,
 
     smw_namespace,
Line 28: Line 29:
 
     CAST(smw_proptable_hash AS CHAR) AS pthash
 
     CAST(smw_proptable_hash AS CHAR) AS pthash
 
FROM
 
FROM
−
     smw_object_ids;</syntaxhighlight>
+
     smw_object_ids;</source>
 +
Looking up titles for each property tuple:
 +
<source lang=mysql>
 +
SELECT
 +
    u.s_id,
 +
    CAST(s.smw_title AS CHAR) AS s_title,
 +
    u.p_id,
 +
    CAST(p.smw_title AS CHAR) AS p_title,
 +
    u.fType,
 +
    CAST(u.val AS CHAR) as uval
 +
FROM
 +
    ((SELECT
 +
        s_id, p_id, 'blob' AS fType, CAST(o_blob AS CHAR) AS val FROM smw_di_blob
 +
UNION SELECT
 +
        s_id, p_id, 'time' AS fType, CAST(o_serialized AS CHAR) as val FROM smw_di_time
 +
UNION SELECT
 +
        s_id, p_id, 'wikiPage' AS fType, o_id AS val FROM smw_di_wikipage
 +
UNION SELECT
 +
        s_id, p_id, 'bool' AS fType, o_value AS val FROM smw_di_bool
 +
UNION SELECT
 +
        s_id, p_id, 'coords' AS fType, o_serialized AS val FROM smw_di_coords
 +
UNION SELECT
 +
        s_id, p_id, 'number' AS fType, o_serialized AS val FROM smw_di_number
 +
UNION SELECT
 +
        s_id, p_id, 'uri' AS fType, CAST(o_blob AS CHAR) AS val FROM smw_di_uri
 +
) AS u
 +
  LEFT JOIN smw_object_ids AS s ON u.s_id = s.smw_id)
 +
  LEFT JOIN smw_object_ids AS p ON u.p_id = p.smw_id
 +
  ORDER BY p_title</source>

Revision as of 12:19, 10 July 2020

About

  • Purpose: registry of all SMW object IDs; apparently replaces smw_ids in schema version 2 but adds smw_proptable_hash field. A smw_iw field was added sometime between SMW versions v1.9 and 2.5.5.

SQL

CREATE TABLE `smw_object_ids` (
  `smw_id` int(8) unsigned NOT NULL AUTO_INCREMENT,
  `smw_namespace` int(11) NOT NULL,
  `smw_title` varbinary(255) NOT NULL,
  `smw_iw` varbinary(32) NOT NULL,
  `smw_subobject` varbinary(255) NOT NULL,
  `smw_sortkey` varbinary(255) NOT NULL,
  `smw_proptable_hash` mediumblob,
  PRIMARY KEY (`smw_id`),
  KEY `smw_id` (`smw_id`,`smw_sortkey`),
  KEY `smw_title` (`smw_title`,`smw_namespace`,`smw_iw`,`smw_subobject`),
  KEY `smw_sortkey` (`smw_sortkey`),
  KEY `smw_iw` (`smw_iw`)
) ENGINE=InnoDB CHARSET=binary;

Examples

Showing the blob values: 

SELECT 
    smw_id,
    smw_namespace,
    CAST(smw_title AS CHAR) AS title,
    CAST(smw_iw AS CHAR) AS iw,
    CAST(smw_subobject AS CHAR) AS sub,
    CAST(smw_sortkey AS CHAR) AS sortkey,
    CAST(smw_proptable_hash AS CHAR) AS pthash
FROM
    smw_object_ids;

Looking up titles for each property tuple: 

SELECT 
    u.s_id,
    CAST(s.smw_title AS CHAR) AS s_title,
    u.p_id,
    CAST(p.smw_title AS CHAR) AS p_title,
    u.fType,
    CAST(u.val AS CHAR) as uval
FROM
    ((SELECT 
        s_id, p_id, 'blob' AS fType, CAST(o_blob AS CHAR) AS val FROM smw_di_blob
	UNION SELECT 
        s_id, p_id, 'time' AS fType, CAST(o_serialized AS CHAR) as val FROM smw_di_time
	UNION SELECT 
        s_id, p_id, 'wikiPage' AS fType, o_id AS val FROM smw_di_wikipage
	UNION SELECT 
        s_id, p_id, 'bool' AS fType, o_value AS val FROM smw_di_bool
	UNION SELECT 
        s_id, p_id, 'coords' AS fType, o_serialized AS val FROM smw_di_coords
	UNION SELECT 
        s_id, p_id, 'number' AS fType, o_serialized AS val FROM smw_di_number
	UNION SELECT 
        s_id, p_id, 'uri' AS fType, CAST(o_blob AS CHAR) AS val FROM smw_di_uri
	) AS u
  LEFT JOIN smw_object_ids AS s ON u.s_id = s.smw_id)
  LEFT JOIN smw_object_ids AS p ON u.p_id = p.smw_id
  ORDER BY p_title
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