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/**
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 * Restore archived documents
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 */
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/* Gather most recent docids from xml_revisions that
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 *  1. do not have systemMetadata.archived=true 
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 *  2. do not exist in xml_documents
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 * */
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CREATE TABLE restore_documents (
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	docid VARCHAR(250),
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	rev INT8,
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	rootnodeid INT8,
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	guid text
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);
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INSERT INTO restore_documents (
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	docid, 
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	rev, 
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	rootnodeid, 
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	guid
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) 
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SELECT 
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	x.docid,
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	x.rev,
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	x.rootnodeid,
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	id.guid
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FROM 
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	xml_revisions x,
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	identifier id,
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	systemMetadata sm
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WHERE x.docid = id.docid
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AND x.rev = id.rev
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AND id.guid = sm.guid
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-- TODO: hone the criteria for selecting documents to restore
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AND sm.archived = true
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AND sm.obsoletedBy is not null;
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/* Move xml_revisions back into xml_documents for the affected docids 
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 */
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INSERT INTO xml_documents
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	(docid, rootnodeid, docname, doctype,
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	user_owner, user_updated, date_created, date_updated,
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	server_location, rev, public_access, catalog_id) 
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SELECT 
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	docid, rootnodeid, docname, doctype,
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	user_owner, user_updated , date_created, date_updated,
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	server_location, rev, public_access, catalog_id
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FROM xml_revisions x, restore_documents rd
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WHERE x.rootnodeid = rd.rootnodeid;
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/* Move xml_nodes_revisions back into xml_nodes for the affected docids 
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 */
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INSERT INTO xml_nodes
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	(nodeid, nodeindex, nodetype, nodename, nodeprefix,
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	nodedata, parentnodeid, rootnodeid, docid, date_created,
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	date_updated, nodedatanumerical, nodedatadate)
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SELECT 
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	nodeid, nodeindex, nodetype, nodename, nodeprefix,  
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	nodedata, parentnodeid, rootnodeid, docid, date_created,
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	date_updated, nodedatanumerical, nodedatadate
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FROM xml_nodes_revisions x, restore_documents rd
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WHERE x.rootnodeid = rd.rootnodeid;
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/* Ensure previous revisions of docids do not have systemMetadata.archived=true
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 * (Avoids encountering this issue again)
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 */
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UPDATE systemMetadata sm
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SET sm.archived = false
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FROM restore_documents rd
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WHERE sm.guid = rd.guid;
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/* Clean up
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 */
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DROP TABLE restore_documents;
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/*
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 * update the database version
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 */
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UPDATE db_version SET status=0;
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INSERT INTO db_version (version, status, date_created) 
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  VALUES ('2.4.0', 1, CURRENT_DATE);
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