Question

我正在尝试执行此操作。它给了我mysql语法的错误。无法弄清楚原因。

CREATE TRIGGER trig1
AFTER INSERT OR UPDATE ON table1 
FOR EACH ROW 
INSERT INTO table2 (id,entity_type,`data`,processed,created_at,last_updated_at ) 
VALUES ( DEFAULT , 'campaigns', 
'{"campaign_id":"' CONCAT NEW.campaign_id CONCAT '","name":"' CONCAT NEW.name CONCAT '","advertiser_id":"' CONCAT NEW.advertiser_id CONCAT '","start_date":"' CONCAT NEW.start_date 
CONCAT '","end_date":"' CONCAT NEW.end_date CONCAT '","status":"' CONCAT NEW.status CONCAT '","pacing":"' CONCAT NEW.pacing CONCAT '","budget_value":"' CONCAT NEW.budget_value 
CONCAT '","gross_budget":"' CONCAT NEW.gross_budget CONCAT '"}' ,
0, CURRENT_TIMESTAMP , CURRENT_TIMESTAMP) ;

Answer 1

你的触发器上几乎没有问题，我会用这样的东西来解决它：

CREATE TRIGGER trig1
AFTER INSERT ON table1 
FOR EACH ROW
INSERT INTO table2 (entity_type,`data`,processed,created_at,last_updated_at) 
VALUES (
  'campaigns',
  CONCAT(
    '{',
    CONCAT_WS(
      ',',
      CONCAT('"campaign_id":"', NEW.campaign_id, '"'),
      CONCAT('"name":"', NEW.name, '"'),
      CONCAT('"status":"', NEW.status, '"'),
    ),
    '}'
  ),
  0,
  CURRENT_TIMESTAMP,
  CURRENT_TIMESTAMP
);

CONCAT将使用值和结束{连结开头}。

将使用CONCAT_WS计算所有值，这将创建逗号分隔的值字符串，并且它将忽略空值。

这将使触发器更具可读性。

Answer 2

您在声明中错误地使用了CONCAT。

应该如下面的陈述所示：

VALUES ( DEFAULT , 'campaigns',   
CONCAT( '{"campaign_id":"', NEW.campaign_id,
        '","name":"', NEW.name,
        '","advertiser_id":"', NEW.advertiser_id,
        '","start_date":"', NEW.start_date,
        '","end_date":"', NEW.end_date,
        '","status":"', NEW.status,
        '","pacing":"', NEW.pacing,
        '","budget_value":"', NEW.budget_value,
        '","gross_budget":"', NEW.gross_budget,
        '"}' ),  
0, CURRENT_TIMESTAMP , CURRENT_TIMESTAMP ) ;

文档参考：

CONCAT(str1,str2,...)
- 返回连接参数产生的字符串。可以有一个或多个参数。

运行Sql Trigger时出错

2 个答案: