在存儲函數或觸發器問題中​​，不允許動態SQL，但在mysql上創建觸發器時

Question

我在mysql上創建觸發器時發生異常，粘貼下面的觸發器片段。我希望在這個觸發器中的prepare語句拋出這個異常，請糾正我語法中的任何錯誤。

DELIMITER $$ 

CREATE DEFINER=`root`@`localhost` TRIGGER mysql_common.mysql_alert_trigger after insert on mysql_common.alert FOR EACH ROW 

BEGIN 

set @col_string = "col1,col2,col3"; 
set @val_string = "('val1','val2','val3')"; 

SET @s := CONCAT('INSERT into msql_common.seperated_processlist(',@col_string,') values ', @val_string); 
PREPARE dynamic_statement FROM @s; 
EXECUTE dynamic_statement; 
DEALLOCATE PREPARE dynamic_statement; 

END $$ 
DELIMITER ; 

Answer 1

DELIMITER $$ 

CREATE DEFINER=`root`@`localhost` TRIGGER mysql_common.mysql_alert_trigger after insert on mysql_common.alert FOR EACH ROWEACH ROW 

BEGIN 

call SOME_PROC(); 
END $$ 
DELIMITER ; 

你可以寫一個程序與您的業務邏輯，並呼籲從觸發這一程序，如上面的code.with特定的輸入和輸出參數。

DELIMITER $$ 
CREATE DEFINER=`root`@`localhost` PROCEDURE `SOME_PROC`() 
BEGIN 
    set @col_string = "col1,col2,col3"; 
set @val_string = "('val1','val2','val3')"; 

SET @s := CONCAT('INSERT into msql_common.seperated_processlist(',@col_string,') values ', @val_string); 
PREPARE dynamic_statement FROM @s; 
EXECUTE dynamic_statement; 
DEALLOCATE PREPARE dynamic_statement; 

END$$ 
DELIMITER ; 

希望這會有所幫助。