mySQL触发第二张表

Question

请帮助这个MySQL触发器 - 已经搜索并找不到语法问题。

错误＃1064 - 您的SQL语法错误;检查与您的MySQL服务器版本相对应的手册，以在'@v_index int DEFAULT 1; WHILE @v_index < = NEW.pt_number INSERT INTO专利”在行9

DELIMITER $$ 

CREATE TRIGGER after_insert_calls_insert_patients 

AFTER INSERT ON Calls 

FOR EACH ROW 

    BEGIN 

    DECLARE @v_index int DEFAULT 1; 

    WHILE @v_index <= NEW.pt_number 

     INSERT INTO Patients SET 

     Patient_id = CONCAT(NEW.Calls_id, '-', @v_index), 
     FK_Calls_id = NEW.Calls_id, 
     update_by = "SYSTEM"; 

     SET @v_index := @v_index +1; 

     END WHILE; 

END; 
$$ 

DELIMITER ; 

Answer 1

尝试放置在@ “DECLARE @v_index INT DEFAULT 1;”