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If you are making custom SQL queries against the DSpace database, they can get very complex due to numerous joins between various levels of DSpace objects (bitstream, bundle, item, collection, community). These helper functions contain the joins so you don't have to write them every time. In other words, using one of these functions in your query saves you from typing the body of the function in your query.
Naming convention: bitstream2item5ds5_bitstream2item(bitstream_id), returns item id (resource_id), works on DSpace 5.x
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SELECT bitstream2item5ds5_bitstream2item(123); -- 456 SELECT item2collectionhandle5ds5_item2collectionhandle(456); -- '123456789/789' SELECT ds5_metadata_field2id5field2id('dc', 'title'); -- 64 SELECT ds5_metadata_field2id5field2id('dc', 'description', 'abstract'); -- 27 SELECT ds5_metadata_id2field5id2field(27); -- (dc,description,abstract) SELECT (ds5_metadata_id2field5id2field(27)).element; -- 'description' |
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Overview
argument → result ↓ | bitstream | bundle | item | collection | community | ||||
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bitstream | - | - | - | - | - | ||||
bundlebitstream2bundle5 | ds5_bitstream2bundle | - | - | - | - | ||||
item | bitstream2item5 bitstream2itemhandle5 | bundle2item5 bundle2itemhandle5 | ds5_bitstream2item ds5_bitstream2itemhandle | ds5_bundle2item ds5_bundle2itemhandle | ds5_item2itemhandle | - | - | ||
collection | bitstream2collection5 bitstream2collectionhandle5 | bundle2collection5 bundle2collectionhandle5 | item2collection5 | ds5_bitstream2collection ds5_bitstream2collectionhandle | ds5_bundle2collection ds5_bundle2collectionhandle | ds5_item2collection | ds5_collection2collectionhandle ds5_collectionhandle2collectioncollection2collectionhandle5 collectionhandle2collection5 | - | |
community | bitstream2community5 bitstream2communityhandle5 | bundle2community5 bundle2communityhandle5 | item2community5 | collection2community5 collection2communityhandle5 collectionhandle2community5 collectionhandle2communityhandle5 | ds5_bitstream2community ds5_bitstream2communityhandle | ds5_bundle2community ds5_bundle2communityhandle | ds5_item2community | ds5_collection2community ds5_collection2communityhandle ds5_collectionhandle2community ds5_collectionhandle2communityhandle | ds5_community2communityhandle ds5_communityhandle2communitycommunity2communityhandle5 communityhandle2community5 |
Other functions:
ds5_metadata_id2field5id2field
ds5_metadata_field2id5field2id
Create functions
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CREATE OR REPLACE FUNCTION bitstream2bundle5ds5_bitstream2bundle(integer) RETURNS integer AS 'SELECT bundle_id FROM bundle2bitstream WHERE bundle2bitstream.bitstream_id = $1' LANGUAGE SQL STABLE RETURNS NULL ON NULL INPUT; CREATE OR REPLACE FUNCTION bitstream2item5ds5_bitstream2item(integer) RETURNS integer AS 'SELECT item2bundle.item_id FROM bundle2bitstream, item2bundle WHERE item2bundle.bundle_id = bundle2bitstream.bundle_id AND bundle2bitstream.bitstream_id = $1' LANGUAGE SQL STABLE RETURNS NULL ON NULL INPUT; CREATE OR REPLACE FUNCTION bitstream2itemhandle5ds5_bitstream2itemhandle(integer) RETURNS varchar AS 'SELECT handle FROM bundle2bitstream, item2bundle, handle WHERE handle.resource_type_id = 2 AND handle.resource_id = item2bundle.item_id AND item2bundle.bundle_id = bundle2bitstream.bundle_id AND bundle2bitstream.bitstream_id = $1' LANGUAGE SQL STABLE RETURNS NULL ON NULL INPUT; CREATE OR REPLACE FUNCTION bitstream2collection5ds5_bitstream2collection(integer) RETURNS integer AS 'SELECT collection2item.collection_id FROM bundle2bitstream, item2bundle, collection2item WHERE collection2item.item_id = item2bundle.item_id AND item2bundle.bundle_id = bundle2bitstream.bundle_id AND bundle2bitstream.bitstream_id = $1' LANGUAGE SQL STABLE RETURNS NULL ON NULL INPUT; CREATE OR REPLACE FUNCTION bitstream2collectionhandle5ds5_bitstream2collectionhandle(integer) RETURNS varchar AS 'SELECT handle FROM bundle2bitstream, item2bundle, collection2item, handle WHERE handle.resource_type_id = 3 AND handle.resource_id = collection2item.collection_id AND collection2item.item_id = item2bundle.item_id AND item2bundle.bundle_id = bundle2bitstream.bundle_id AND bundle2bitstream.bitstream_id = $1' LANGUAGE SQL STABLE RETURNS NULL ON NULL INPUT; CREATE OR REPLACE FUNCTION bitstream2community5ds5_bitstream2community(integer) RETURNS integer AS 'SELECT community2collection.community_id FROM bundle2bitstream, item2bundle, collection2item, community2collection WHERE community2collection.collection_id = collection2item.collection_id AND collection2item.item_id = item2bundle.item_id AND item2bundle.bundle_id = bundle2bitstream.bundle_id AND bundle2bitstream.bitstream_id = $1' LANGUAGE SQL STABLE RETURNS NULL ON NULL INPUT; CREATE OR REPLACE FUNCTION bitstream2communityhandle5ds5_bitstream2communityhandle(integer) RETURNS varchar AS 'SELECT handle FROM bundle2bitstream, item2bundle, collection2item, community2collection, handle WHERE handle.resource_type_id = 4 AND handle.resource_id = community2collection.community_id AND community2collection.collection_id = collection2item.collection_id AND collection2item.item_id = item2bundle.item_id AND item2bundle.bundle_id = bundle2bitstream.bundle_id AND bundle2bitstream.bitstream_id = $1' LANGUAGE SQL STABLE RETURNS NULL ON NULL INPUT; CREATE OR REPLACE FUNCTION bundle2item5ds5_bundle2item(integer) RETURNS integer AS 'SELECT item2bundle.item_id FROM item2bundle WHERE item2bundle.bundle_id = $1' LANGUAGE SQL STABLE RETURNS NULL ON NULL INPUT; CREATE OR REPLACE FUNCTION bundle2itemhandle5ds5_bundle2itemhandle(integer) RETURNS varchar AS 'SELECT handle FROM item2bundle, handle WHERE handle.resource_type_id = 2 AND handle.resource_id = item2bundle.item_id AND item2bundle.bundle_id = $1' LANGUAGE SQL STABLE RETURNS NULL ON NULL INPUT; CREATE OR REPLACE FUNCTION bundle2collection5ds5_bundle2collection(integer) RETURNS integer AS 'SELECT collection2item.collection_id FROM item2bundle, collection2item WHERE collection2item.item_id = item2bundle.item_id AND item2bundle.bundle_id = $1' LANGUAGE SQL STABLE RETURNS NULL ON NULL INPUT; CREATE OR REPLACE FUNCTION bundle2collectionhandle5ds5_bundle2collectionhandle(integer) RETURNS varchar AS 'SELECT handle FROM item2bundle, collection2item, handle WHERE handle.resource_type_id = 3 AND handle.resource_id = collection2item.collection_id AND collection2item.item_id = item2bundle.item_id AND item2bundle.bundle_id = $1' LANGUAGE SQL STABLE RETURNS NULL ON NULL INPUT; CREATE OR REPLACE FUNCTION bundle2community5ds5_bundle2community(integer) RETURNS integer AS 'SELECT community2collection.community_id FROM item2bundle, collection2item, community2collection WHERE community2collection.collection_id = collection2item.collection_id AND collection2item.item_id = item2bundle.item_id AND item2bundle.bundle_id = $1' LANGUAGE SQL STABLE RETURNS NULL ON NULL INPUT; CREATE OR REPLACE FUNCTION bundle2communityhandle5ds5_bundle2communityhandle(integer) RETURNS varchar AS 'SELECT handle FROM item2bundle, collection2item, community2collection, handle WHERE handle.resource_type_id = 4 AND handle.resource_id = community2collection.community_id AND community2collection.collection_id = collection2item.collection_id AND collection2item.item_id = item2bundle.item_id AND item2bundle.bundle_id = $1' LANGUAGE SQL STABLE RETURNS NULL ON NULL INPUT; CREATE OR REPLACE FUNCTION item2itemhandle5ds5_item2itemhandle(integer) RETURNS varchar AS 'SELECT handle FROM handle WHERE handle.resource_type_id = 2 AND handle.resource_id = $1' LANGUAGE SQL STABLE RETURNS NULL ON NULL INPUT; CREATE OR REPLACE FUNCTION itemhandle2item5ds5_itemhandle2item(varchar) RETURNS integer AS 'SELECT resource_id FROM handle WHERE handle.resource_type_id = 2 AND handle = $1' LANGUAGE SQL STABLE RETURNS NULL ON NULL INPUT; CREATE OR REPLACE FUNCTION item2collection5ds5_item2collection(integer) RETURNS integer AS 'SELECT collection2item.collection_id FROM collection2item WHERE collection2item.item_id = $1' LANGUAGE SQL STABLE RETURNS NULL ON NULL INPUT; CREATE OR REPLACE FUNCTION item2collectionhandle5ds5_item2collectionhandle(integer) RETURNS varchar AS 'SELECT handle FROM collection2item, handle WHERE handle.resource_type_id = 3 AND handle.resource_id = collection2item.collection_id AND collection2item.item_id = $1' LANGUAGE SQL STABLE RETURNS NULL ON NULL INPUT; CREATE OR REPLACE FUNCTION itemhandle2collection5ds5_itemhandle2collection(varchar) RETURNS integer AS 'SELECT collection_id FROM collection2item WHERE collection2item.item_id = ( SELECT resource_id FROM handle WHERE handle.resource_type_id = 2 AND handle = $1 )' LANGUAGE SQL STABLE RETURNS NULL ON NULL INPUT; CREATE OR REPLACE FUNCTION itemhandle2collectionhandle5ds5_itemhandle2collectionhandle(varchar) RETURNS varchar AS 'SELECT handle FROM collection2item, handle WHERE handle.resource_type_id = 3 AND handle.resource_id = collection2item.collection_id AND collection2item.item_id = ( SELECT resource_id FROM handle WHERE handle.resource_type_id = 2 AND handle = $1 )' LANGUAGE SQL STABLE RETURNS NULL ON NULL INPUT; CREATE OR REPLACE FUNCTION item2community5 ds5_item2community(integer) RETURNS integer AS 'SELECT community_id FROM collection2item, community2collection WHERE community2collection.collection_id = collection2item.collection_id AND collection2item.item_id = $1' LANGUAGE SQL STABLE RETURNS NULL ON NULL INPUT; CREATE OR REPLACE FUNCTION item2communityhandle5ds5_item2communityhandle(integer) RETURNS varchar AS 'SELECT handle FROM collection2item, community2collection, handle WHERE handle.resource_type_id = 4 AND handle.resource_id = community2collection.community_id AND community2collection.collection_id = collection2item.collection_id AND collection2item.item_id = $1' LANGUAGE SQL STABLE RETURNS NULL ON NULL INPUT; CREATE OR REPLACE FUNCTION itemhandle2community5ds5_itemhandle2community(varchar) RETURNS integer AS 'SELECT community_id FROM collection2item, community2collection WHERE community2collection.collection_id = collection2item.collection_id AND collection2item.item_id = ( SELECT resource_id FROM handle WHERE handle.resource_type_id = 2 AND handle = $1 )' LANGUAGE SQL STABLE RETURNS NULL ON NULL INPUT; CREATE OR REPLACE FUNCTION itemhandle2communityhandle5ds5_itemhandle2communityhandle(varchar) RETURNS varchar AS 'SELECT handle FROM collection2item, community2collection, handle WHERE handle.resource_type_id = 4 AND handle.resource_id = community2collection.community_id AND community2collection.collection_id = collection2item.collection_id AND collection2item.item_id = ( SELECT resource_id FROM handle WHERE handle.resource_type_id = 2 AND handle = $1 )' LANGUAGE SQL STABLE RETURNS NULL ON NULL INPUT; CREATE OR REPLACE FUNCTION collection2collectionhandle5ds5_collection2collectionhandle(integer) RETURNS varchar AS 'SELECT handle FROM handle WHERE handle.resource_type_id = 3 AND handle.resource_id = $1' LANGUAGE SQL STABLE RETURNS NULL ON NULL INPUT; CREATE OR REPLACE FUNCTION collectionhandle2collection5ds5_collectionhandle2collection(varchar) RETURNS integer AS 'SELECT resource_id FROM handle WHERE handle.resource_type_id = 3 AND handle = $1' LANGUAGE SQL STABLE RETURNS NULL ON NULL INPUT; CREATE OR REPLACE FUNCTION collection2community5ds5_collection2community(integer) RETURNS integer AS 'SELECT community_id FROM collection2item, community2collection WHERE community2collection.collection_id = $1' LANGUAGE SQL STABLE RETURNS NULL ON NULL INPUT; CREATE OR REPLACE FUNCTION collection2communityhandle5ds5_collection2communityhandle(integer) RETURNS varchar AS 'SELECT handle FROM collection2item, community2collection, handle WHERE handle.resource_type_id = 4 AND handle.resource_id = community2collection.community_id AND community2collection.collection_id = $1' LANGUAGE SQL STABLE RETURNS NULL ON NULL INPUT; CREATE OR REPLACE FUNCTION collectionhandle2community5ds5_collectionhandle2community(varchar) RETURNS integer AS 'SELECT community_id FROM collection2item, community2collection WHERE community2collection.collection_id = ( SELECT resource_id FROM handle WHERE handle.resource_type_id = 3 AND handle = $1 )' LANGUAGE SQL STABLE RETURNS NULL ON NULL INPUT; CREATE OR REPLACE FUNCTION collectionhandle2communityhandle5ds5_collectionhandle2communityhandle(varchar) RETURNS varchar AS 'SELECT handle FROM collection2item, community2collection, handle WHERE handle.resource_type_id = 4 AND handle.resource_id = community2collection.community_id AND community2collection.collection_id = ( SELECT resource_id FROM handle WHERE handle.resource_type_id = 3 AND handle = $1 )' LANGUAGE SQL STABLE RETURNS NULL ON NULL INPUT; CREATE OR REPLACE FUNCTION community2communityhandle5ds5_community2communityhandle(integer) RETURNS varchar AS 'SELECT handle FROM handle WHERE handle.resource_type_id = 4 AND handle.resource_id = $1' LANGUAGE SQL STABLE RETURNS NULL ON NULL INPUT; CREATE OR REPLACE FUNCTION communityhandle2community5ds5_communityhandle2community(varchar) RETURNS integer AS 'SELECT resource_id FROM handle WHERE handle.resource_type_id = 4 AND handle = $1' LANGUAGE SQL STABLE RETURNS NULL ON NULL INPUT; CREATE OR REPLACE FUNCTION ds5_metadata_id2field5id2field(integer) RETURNS TABLE (schema varchar, element varchar, qualifier varchar) AS 'SELECT short_id AS schema, element, qualifier FROM metadatafieldregistry, metadataschemaregistry WHERE metadatafieldregistry.metadata_schema_id = metadataschemaregistry.metadata_schema_id AND metadata_field_id = $1' LANGUAGE SQL STABLE RETURNS NULL ON NULL INPUT; CREATE OR REPLACE FUNCTION ds5_metadata_field2id5field2id(varchar, varchar, varchar) RETURNS integer AS 'SELECT metadata_field_id FROM metadatafieldregistry, metadataschemaregistry WHERE metadatafieldregistry.metadata_schema_id = metadataschemaregistry.metadata_schema_id AND short_id = $1 AND element = $2 AND qualifier = $3' LANGUAGE SQL STABLE RETURNS NULL ON NULL INPUT; CREATE OR REPLACE FUNCTION ds5_metadata_field2id5field2id(varchar, varchar) RETURNS integer AS 'SELECT metadata_field_id FROM metadatafieldregistry, metadataschemaregistry WHERE metadatafieldregistry.metadata_schema_id = metadataschemaregistry.metadata_schema_id AND short_id = $1 AND element = $2 AND qualifier IS NULL' LANGUAGE SQL STABLE RETURNS NULL ON NULL INPUT; |
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DROP FUNCTION bitstream2bundle5ds5_bitstream2bundle(integer); DROP FUNCTION bitstream2item5ds5_bitstream2item(integer); DROP FUNCTION bitstream2itemhandle5ds5_bitstream2itemhandle(integer); DROP FUNCTION bitstream2collection5ds5_bitstream2collection(integer); DROP FUNCTION bitstream2collectionhandle5ds5_bitstream2collectionhandle(integer); DROP FUNCTION bitstream2community5ds5_bitstream2community(integer); DROP FUNCTION bitstream2communityhandle5ds5_bitstream2communityhandle(integer); DROP FUNCTION bundle2item5ds5_bundle2item(integer); DROP FUNCTION bundle2itemhandle5ds5_bundle2itemhandle(integer); DROP FUNCTION bundle2collection5ds5_bundle2collection(integer); DROP FUNCTION bundle2collectionhandle5ds5_bundle2collectionhandle(integer); DROP FUNCTION bundle2community5ds5_bundle2community(integer); DROP FUNCTION bundle2communityhandle5ds5_bundle2communityhandle(integer); DROP FUNCTION item2itemhandle5ds5_item2itemhandle(integer); DROP FUNCTION itemhandle2item5ds5_itemhandle2item(varchar); DROP FUNCTION item2collection5ds5_item2collection(integer); DROP FUNCTION item2collectionhandle5ds5_item2collectionhandle(integer); DROP FUNCTION itemhandle2collection5ds5_itemhandle2collection(varchar); DROP FUNCTION itemhandle2collectionhandle5ds5_itemhandle2collectionhandle(varchar); DROP FUNCTION item2community5ds5_item2community(integer); DROP FUNCTION item2communityhandle5ds5_item2communityhandle(integer); DROP FUNCTION itemhandle2community5ds5_itemhandle2community(varchar); DROP FUNCTION itemhandle2communityhandle5ds5_itemhandle2communityhandle(varchar); DROP FUNCTION collection2collectionhandle5ds5_collection2collectionhandle(integer); DROP FUNCTION collectionhandle2collection5ds5_collectionhandle2collection(varchar); DROP FUNCTION collection2community5ds5_collection2community(integer); DROP FUNCTION collection2communityhandle5ds5_collection2communityhandle(integer); DROP FUNCTION collectionhandle2community5ds5_collectionhandle2community(varchar); DROP FUNCTION collectionhandle2communityhandle5ds5_collectionhandle2communityhandle(varchar); DROP FUNCTION community2communityhandle5ds5_community2communityhandle(integer); DROP FUNCTION communityhandle2community5ds5_communityhandle2community(varchar); DROP FUNCTION ds5_metadata_id2field5id2field(integer); DROP FUNCTION ds5_metadata_field2id5field2id(varchar, varchar, varchar); DROP FUNCTION ds5_metadata_field2id5field2id(varchar, varchar); |