我的查询语句依赖如下函数，如何在代码中定义呢？

DELIMITER $$
CREATE FUNCTION isUpBan
        (in_lastclose      decimal(15,10),
         in_open     DECIMAL(15,10),
         in_close    DECIMAL(15,10),
         in_high     DECIMAL(15,10),
         in_low      DECIMAL(15,10))
    
       RETURNS tinyint(1)
     BEGIN
       DECLARE l_new_string VARCHAR(255);
       DECLARE last_close   INT;
       DECLARE cur_open   INT;
       DECLARE cur_close   INT;
       DECLARE cur_high   INT;
       DECLARE cur_low   INT;
       DECLARE banUpPrice1   INT;
       DECLARE banUpPrice2   INT;
       DECLARE ret TINYINT;
    
       SET last_close=in_lastclose*1000/10;
       SET cur_open=in_open*1000/10;
       SET cur_close=in_close*1000/10;
       SET cur_high=in_high*1000/10;
       SET cur_low=in_low*1000/10;
       
       set banUpPrice1 = (last_close * 1050 + 500) / 1000;
       SET banUpPrice1 = (last_close * 1100 + 500) / 1000;
       

       SET ret=1;
       
       IF (cur_open=cur_high && cur_open=cur_low && cur_open=cur_close && cur_open>last_close) THEN
         SET ret=1;
       END IF;
       
       IF (cur_close!=cur_high) THEN
         SET ret=0;
       END IF;
       
       IF (cur_close!=banUpPrice1 && cur_close!=banUpPrice2) THEN
         SET ret=0;
       END IF;
       
       RETURN(ret);
    
     END$$