seaweedfs/weed/filer/ydb/ydb_queries.go

package ydb

const (
	createQuery = `
		PRAGMA TablePathPrefix("%s");
		CREATE TABLE file_meta (
			dir_hash int64,
			name Utf8,
			directory Utf8,
			meta String,
			PRIMARY KEY (dir_hash, name)
		);`

	insertQuery = `
		DECLARE $dir_hash int64;
		DECLARE $name AS Utf8;
		DECLARE $directory AS Utf8;
		DECLARE $meta AS String;

		UPSERT INTO file_meta
			(dir_hash, name, directory, meta)
		VALUES
			($dir_hash, $name, $directory, $meta);`

	updateQuery = `
		DECLARE $dir_hash int64;
		DECLARE $name AS Utf8;
		DECLARE $directory AS Utf8;
		DECLARE $meta AS String;

		REPLACE INTO file_meta
			(dir_hash, name, directory, meta)
		VALUES
			($dir_hash, $name, $directory, $meta)
		COMMIT;`

	deleteQuery = `
		DECLARE $dir_hash int64;
		DECLARE $name AS Utf8;

		DELETE FROM file_meta 
		WHERE dir_hash == $dir_hash AND name == $name;
		COMMIT;`

	findQuery = `
		DECLARE $dir_hash int64;
		DECLARE $name AS Utf8;
		
		SELECT meta
		FROM file_meta
		WHERE dir_hash == $dir_hash AND name == $name;`

	deleteFolderChildrenQuery = `
		DECLARE $dir_hash int64;
		DECLARE $directory AS Utf8;

		DELETE FROM file_meta 
		WHERE dir_hash == $dir_hash AND directory == $directory;
		COMMIT;`

	ListDirectoryQuery = `
		DECLARE $dir_hash int64;
		DECLARE $directory AS Utf8;
		DECLARE $start_name AS Utf8;
		DECLARE $prefix AS Utf8;
		DECLARE $limit AS int64;
		
		SELECT name, meta
		FROM file_meta
		WHERE dir_hash == $dir_hash AND directory == $directory and name %v $start_name and name LIKE '$prefix%'
		ORDER BY name ASC LIMIT $limit;`
)