$check_query += " FOR UPDATE";
时间: 2024-05-25 17:18:02 浏览: 12
This statement is used in SQL to lock the selected rows for update until the transaction is complete. It ensures that no other transaction can modify the selected rows until the current transaction is finished. The "FOR UPDATE" statement is commonly used in scenarios where multiple users are accessing the same data simultaneously, such as in a database application, to prevent data inconsistency and conflicts.
相关问题
have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ':remark OR :remark IS NULL)\n AND (s.ftype_id = :ftype_id OR :ftype_' at line 8") def fetch_data_api_mode(platforms, remark, user_id=None, ftype_id=None, inviter_id=None, page=None, page_size=None): table_name_strategy_mapping = { 'okx': 'strategy_okxapimode', 'binance': 'strategy_bnapimode', # 添加其他平台的映射关系 } table_names_strategy = [table_name_strategy_mapping[p] for p in platforms] union_queries = [] for strategy in table_names_strategy: union_query = f""" SELECT s.id, s.create_time, s.update_time, s.ftype_id, s.active, s.user_id, s.platform, s.remark, s.inviter_id, s.user_id, u.username AS username, s.inviter_id, u_inviter.username AS inviter_name FROM {strategy} AS s LEFT JOIN system_user AS u ON s.user_id = u.id LEFT JOIN system_user AS u_inviter ON s.inviter_id = u_inviter.id WHERE (s.remark = :remark OR :remark IS NULL) AND (s.ftype_id = :ftype_id OR :ftype_id IS NULL) AND (s.user_id = :user_id OR :user_id IS NULL) AND (s.inviter_id = :inviter_id OR :inviter_id IS NULL) """ union_queries.append(union_query) query = f""" SELECT id, create_time, update_time, ftype_id, active, user_id, platform, remark, inviter_id, inviter_name,user_id,username FROM ({' UNION ALL '.join(union_queries)}) AS combined_tables ORDER BY create_time DESC LIMIT :page_size OFFSET :offset """ count_query = f""" SELECT COUNT(*) AS total_count FROM ({' UNION ALL '.join(union_queries)}) AS combined_tables """ query_parms = { 'remark': remark, 'ftype_id': ftype_id, 'user_id': user_id, 'inviter_id': inviter_id, 'page_size': page_size, 'offset': (page - 1) * page_size if page is not None and page_size is not None else None } result = execute_raw_sql_query(query, query_parms) count_result = execute_raw_sql_query(count_query, query_parms) return result, count_result[0]['total_count']
根据您提供的代码,错误可能是由于SQL语法问题引起的。根据错误消息,看起来是与第8行的语法有关。
在您的代码中,您使用了参数占位符(:remark,:ftype_id,:user_id,:inviter_id)。但是,根据错误消息,似乎您正在使用MySQL数据库,而MySQL使用的参数占位符不同。在MySQL中,通常使用问号占位符(?)而不是冒号(:)作为参数占位符。
要解决这个问题,您可以尝试将查询中的参数占位符更改为问号占位符,如下所示:
```python
union_query = """
SELECT s.id, s.create_time, s.update_time, s.ftype_id, s.active, s.user_id, s.platform, s.remark, s.inviter_id,
s.user_id, u.username AS username, s.inviter_id, u_inviter.username AS inviter_name
FROM {strategy} AS s
LEFT JOIN system_user AS u ON s.user_id = u.id
LEFT JOIN system_user AS u_inviter ON s.inviter_id = u_inviter.id
WHERE (s.remark = ? OR ? IS NULL)
AND (s.ftype_id = ? OR ? IS NULL)
AND (s.user_id = ? OR ? IS NULL)
AND (s.inviter_id = ? OR ? IS NULL)
"""
```
然后在执行查询时,将参数值作为一个元组传递给execute_raw_sql_query()函数:
```python
result = execute_raw_sql_query(query, (remark, ftype_id, user_id, inviter_id, page_size, (page - 1) * page_size if page is not None and page_size is not None else None))
count_result = execute_raw_sql_query(count_query, (remark, ftype_id, user_id, inviter_id))
```
请注意,我仅在这段代码中提供了更改参数占位符的示例。您还需要根据您的代码适配其他部分,以确保所有参数占位符都正确地使用了问号占位符。
希望这可以帮助您解决问题。如果问题仍然存在,请提供更多的信息,以便我可以更好地帮助您。
Tohoro query = new Tohoro(); query.setReservationListNo(tohoro.getReservationListNo()); List<Tohoro> list= tohoroMapper.selectTohoroList(query); boolean check=true; for (Tohoro item:list){ if("0".equals(item.getCheckStatus())){ check=false; } } if(check){ ReservationList checkItem= reservationListMapper.selectReservationListListByReservationListNo(tohoro.getReservationListNo()); if(checkItem!=null){ ReservationList update = new ReservationList(); update.setTicketStatus("1"); update.setId(checkItem.getId()); reservationListMapper.updateReservationList(update); } }请根据这段代码写一个存储过程
根据这段Java代码,可以编写一个存储过程来更新ReservationList表中的数据。以下是一个示例:
```
DELIMITER //
CREATE PROCEDURE update_reservation_list(IN reservation_list_no INT)
BEGIN
DECLARE check_status VARCHAR(255);
DECLARE check_item_id INT;
DECLARE done INT DEFAULT FALSE;
DECLARE cur CURSOR FOR SELECT check_status, check_item_id FROM (
SELECT
(CASE WHEN check_status = '0' THEN 'false' ELSE 'true' END) AS check_status,
reservation_list.id AS check_item_id
FROM tohoro
JOIN reservation_list ON tohoro.reservation_list_no = reservation_list.reservation_list_no
WHERE tohoro.reservation_list_no = reservation_list_no
) AS subquery;
DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = TRUE;
OPEN cur;
read_loop: LOOP
FETCH cur INTO check_status, check_item_id;
IF done THEN
LEAVE read_loop;
END IF;
IF check_status = 'false' THEN
-- 如果存在check_status为0的记录,则直接退出循环
LEAVE read_loop;
END IF;
END LOOP;
CLOSE cur;
IF check_status = 'true' THEN
-- 如果所有记录的check_status都为1,则更新ReservationList表
UPDATE reservation_list SET ticket_status = '1' WHERE id = check_item_id;
END IF;
END //
DELIMITER ;
```
这个存储过程接受一个输入参数reservation_list_no,它使用游标来检索与该参数匹配的Tohoro和ReservationList表中的数据,并检查所有记录的check_status是否都为1。如果是,则更新ReservationList表中的相应记录的ticket_status列为1。
要使用此存储过程,您可以使用以下语句调用它:
```
CALL update_reservation_list(123);
```
其中,123是您要更新的ReservationList记录的reservation_list_no值。请注意,在实际使用中,您需要根据您的表结构和需要进行适当的修改。
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