Question

我在sqlite3中创建此触发器second_loop时遇到问题：它是更多代码的一部分，但正是这一部分给出了错误。当我在数据库上执行代码时，我得到以下结果：靠近“CREATE”：语法错误。

我确信触发器内的部件运行良好，因为我已单独测试它，但是必须有其它类型的问题。

请注意，我在同一个SQL中有另一个触发器，它工作得很好！

请指教，谢谢

CREATE TRIGGER second_loop AFTER UPDATE OF stack_count ON global WHEN NEW.stack_count<>0

BEGIN
 CREATE TEMP TABLE last_row(id INTEGER PRIMARY KEY, unvisited INTEGER DEFAULT 1, predecessor INTEGER DEFAULT 0, discovery INTEGER DEFAULT 0, finish INTEGER DEFAULT 0);

 INSERT INTO last_row
        SELECT *
        FROM nodes
        WHERE id = (SELECT node_id
                   FROM stack
                   ORDER BY oid DESC LIMIT 1);

 UPDATE last_row SET unvisited =0, predecessor = (SELECT parent_id FROM global), discovery = (SELECT time FROM global);

 UPDATE global SET current_id = (SELECT node_id FROM stack WHERE ROWID = (SELECT MAX(ROWID) FROM stack));
 UPDATE global SET time = time + 1;

 DELETE FROM stack WHERE ROWID = (SELECT MAX(ROWID));

 INSERT INTO stack(node_id)
   SELECT DISTINCT edges.target_id
   FROM nodes, edges, global
   WHERE edges.source_id=global.current_id AND nodes.unvisited=1;

  -- update stack count to go to second_loop trigger
  UPDATE global SET stack_count = stack_count + 1;
 END;

Answer 1

根据CREATE TRIGGER statement，SQLite3的syntax diagram不支持嵌入式CREATE TEMP TABLE子语句。

无法在SQLite3中创建TRIGGER

1 个答案: