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The metadatavalue table is an important table in DSpace because it holds the metadata values of DSpace objects (ie. article title, authors, identifiers). The table uses the so-called EAV (Entity-attribute-value) model as further explained in this article.

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SELECT text_value
FROM metadatavalue
WHERE metadata_field_id = ds6_metadata_field2id('contributor', 'author')
AND dspace_object_id='f2cf9909-0357-4037-8305-4a426bf9a826';

Example

The following query selects the titles and handles of collections whose titles end with "Research".

SELECT metadatavalue.text_value, handle.handle
FROM collection
INNER JOIN metadatavalue ON collection.uuid = metadatavalue.dspace_object_id
INNER JOIN handle ON collection.uuid = handle.resource_id
WHERE metadatavalue.metadata_field_id = 64
AND metadatavalue.text_value LIKE '%Research';

See also

• Metadata for all DSpace objects
• Storage Layer#RDBMS/DatabaseStructure
• Metadata and Bitstream Format Registries
• Helper SQL functions for DSpace 6

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