107 lines
3.3 KiB
SQL
107 lines
3.3 KiB
SQL
CREATE TABLE IF NOT EXISTS image(
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sha1 TEXT NOT NULL, -- SHA-1 hash of file in lowercase hexadecimal
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width INTEGER NOT NULL, -- cached media width
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height INTEGER NOT NULL, -- cached media height
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thumbw INTEGER, -- cached thumbnail width, if known
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thumbh INTEGER, -- cached thumbnail height, if known
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dhash INTEGER, -- uint64 perceptual hash as a signed integer
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CHECK (unhex(sha1) IS NOT NULL AND lower(sha1) = sha1),
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PRIMARY KEY (sha1)
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) STRICT;
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CREATE INDEX IF NOT EXISTS image__dhash ON image(dhash);
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--
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CREATE TABLE IF NOT EXISTS node(
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id INTEGER NOT NULL, -- unique ID
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parent INTEGER REFERENCES node(id), -- root if NULL
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name TEXT NOT NULL, -- path component
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mtime INTEGER, -- files: Unix time in seconds
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sha1 TEXT REFERENCES image(sha1), -- files: content hash
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PRIMARY KEY (id)
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) STRICT;
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CREATE INDEX IF NOT EXISTS node__sha1 ON node(sha1);
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CREATE INDEX IF NOT EXISTS node__parent ON node(parent);
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CREATE UNIQUE INDEX IF NOT EXISTS node__parent_name
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ON node(IFNULL(parent, 0), name);
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CREATE TRIGGER IF NOT EXISTS node__sha1__check
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BEFORE UPDATE OF sha1 ON node
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WHEN OLD.sha1 IS NULL AND NEW.sha1 IS NOT NULL
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AND EXISTS(SELECT id FROM node WHERE parent = OLD.id)
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BEGIN
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SELECT RAISE(ABORT, 'trying to turn a non-empty directory into a file');
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END;
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/*
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Automatic garbage collection, not sure if it actually makes any sense.
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This needs PRAGMA recursive_triggers = 1; to work properly.
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CREATE TRIGGER IF NOT EXISTS node__parent__gc
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AFTER DELETE ON node FOR EACH ROW
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BEGIN
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DELETE FROM node WHERE id = OLD.parent
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AND id NOT IN (SELECT DISTINCT parent FROM node);
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END;
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*/
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--
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CREATE TABLE IF NOT EXISTS orphan(
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sha1 TEXT NOT NULL REFERENCES image(sha1),
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path TEXT NOT NULL, -- last occurence within the database hierarchy
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PRIMARY KEY (sha1)
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) STRICT;
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-- Renaming/moving a file can result either in a (ref, unref) or a (unref, ref)
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-- sequence during sync, and I want to get at the same result.
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CREATE TRIGGER IF NOT EXISTS node__sha1__deorphan_insert
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AFTER INSERT ON node
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WHEN NEW.sha1 IS NOT NULL
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BEGIN
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DELETE FROM orphan WHERE sha1 = NEW.sha1;
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END;
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CREATE TRIGGER IF NOT EXISTS node__sha1__deorphan_update
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AFTER UPDATE OF sha1 ON node
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WHEN NEW.sha1 IS NOT NULL
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BEGIN
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DELETE FROM orphan WHERE sha1 = NEW.sha1;
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END;
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--
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CREATE TABLE IF NOT EXISTS tag_space(
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id INTEGER NOT NULL,
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name TEXT NOT NULL,
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description TEXT,
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CHECK (name NOT LIKE '%:%' AND name NOT LIKE '-%'),
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PRIMARY KEY (id)
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) STRICT;
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CREATE UNIQUE INDEX IF NOT EXISTS tag_space__name ON tag_space(name);
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-- To avoid having to deal with NULLs, always create this special tag space.
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INSERT OR IGNORE INTO tag_space(id, name, description)
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VALUES(0, '', 'User-defined tags');
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CREATE TABLE IF NOT EXISTS tag(
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id INTEGER NOT NULL,
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space INTEGER NOT NULL REFERENCES tag_space(id),
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name TEXT NOT NULL,
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PRIMARY KEY (id)
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) STRICT;
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CREATE UNIQUE INDEX IF NOT EXISTS tag__space_name ON tag(space, name);
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CREATE TABLE IF NOT EXISTS tag_assignment(
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sha1 TEXT NOT NULL REFERENCES image(sha1),
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tag INTEGER NOT NULL REFERENCES tag(id),
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weight REAL NOT NULL, -- 0..1 normalized weight assigned to tag
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PRIMARY KEY (sha1, tag)
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) STRICT;
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CREATE INDEX IF NOT EXISTS tag_assignment__tag ON tag_assignment(tag);
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