ydb Sql interface

weed/filer/ydb/ydb_queries.go

@@ -0,0 +1,72 @@
+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;`
+)