--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/OrthancServer/Sources/Database/Upgrade4To5.sql	Wed Jun 10 20:30:34 2020 +0200
@@ -0,0 +1,66 @@
+-- This SQLite script updates the version of the Orthanc database from 4 to 5.
+
+
+-- Remove 2 indexes to speed up
+
+DROP INDEX MainDicomTagsIndex2;
+DROP INDEX MainDicomTagsIndexValues;
+
+
+-- Add a new table to index the DICOM identifiers
+
+CREATE TABLE DicomIdentifiers(
+       id INTEGER REFERENCES Resources(internalId) ON DELETE CASCADE,
+       tagGroup INTEGER,
+       tagElement INTEGER,
+       value TEXT,
+       PRIMARY KEY(id, tagGroup, tagElement)
+       );
+
+CREATE INDEX DicomIdentifiersIndex1 ON DicomIdentifiers(id);
+CREATE INDEX DicomIdentifiersIndex2 ON DicomIdentifiers(tagGroup, tagElement);
+CREATE INDEX DicomIdentifiersIndexValues ON DicomIdentifiers(value COLLATE BINARY);
+
+
+-- Migrate data from MainDicomTags to MainResourcesTags and MainInstancesTags
+
+INSERT INTO DicomIdentifiers SELECT * FROM MainDicomTags
+       WHERE ((tagGroup = 16 AND tagElement = 32) OR  -- PatientID (0x0010, 0x0020)
+              (tagGroup = 32 AND tagElement = 13) OR  -- StudyInstanceUID (0x0020, 0x000d)
+              (tagGroup = 8  AND tagElement = 80) OR  -- AccessionNumber (0x0008, 0x0050)
+              (tagGroup = 32 AND tagElement = 14) OR  -- SeriesInstanceUID (0x0020, 0x000e)
+              (tagGroup = 8  AND tagElement = 24));   -- SOPInstanceUID (0x0008, 0x0018)
+
+DELETE FROM MainDicomTags
+       WHERE ((tagGroup = 16 AND tagElement = 32) OR  -- PatientID (0x0010, 0x0020)
+              (tagGroup = 32 AND tagElement = 13) OR  -- StudyInstanceUID (0x0020, 0x000d)
+              (tagGroup = 8  AND tagElement = 80) OR  -- AccessionNumber (0x0008, 0x0050)
+              (tagGroup = 32 AND tagElement = 14) OR  -- SeriesInstanceUID (0x0020, 0x000e)
+              (tagGroup = 8  AND tagElement = 24));   -- SOPInstanceUID (0x0008, 0x0018)
+
+
+-- Upgrade the "ResourceDeleted" trigger
+
+DROP TRIGGER ResourceDeleted;
+DROP TRIGGER ResourceDeletedParentCleaning;
+
+CREATE TRIGGER ResourceDeleted
+AFTER DELETE ON Resources
+BEGIN
+  SELECT SignalResourceDeleted(old.publicId, old.resourceType);
+  SELECT SignalRemainingAncestor(parent.publicId, parent.resourceType) 
+    FROM Resources AS parent WHERE internalId = old.parentId;
+END;
+
+CREATE TRIGGER ResourceDeletedParentCleaning
+AFTER DELETE ON Resources
+FOR EACH ROW WHEN (SELECT COUNT(*) FROM Resources WHERE parentId = old.parentId) = 0
+BEGIN
+  DELETE FROM Resources WHERE internalId = old.parentId;
+END;
+
+
+-- Change the database version
+-- The "1" corresponds to the "GlobalProperty_DatabaseSchemaVersion" enumeration
+
+UPDATE GlobalProperties SET value="5" WHERE property=1;