message = new int[num]

As an AI language model, I do not have the context to understand what the variable "num" represents, nor the purpose of creating a new integer array called "message". Please provide more information or context so I can assist you better.

相关问题

BEGIN DECLARE count INT; SELECT COUNT(*) into count from reserve where r_time=NEW.r_time AND d_id=NEW.d_id; IF EXISTS (SELECT work_start FROM work WHERE work_start = CONCAT(DATE_FORMAT(NEW.r_time, '%W%H:%i'))) THEN INSERT INTO reserve (r_id, p_id, d_id, r_time, r_status, r_out_num) VALUES (New.r_id, New.p_id, New.d_id, New.r_time, '已预约', null); ELSE SIGNAL SQLSTATE '45000' SET MESSAGE_TEXT = 'Data does not meet the requirements'; END IF; SELECT renshu into @num from work where d_id=NEW.d_id AND work_start = CONCAT(DATE_FORMAT(NEW.r_time, '%W%H:%i')) LIMIT 1; IF count <= @num THEN UPDATE reserve SET r_out_num = @num - count, d_id = NEW.d_id WHERE r_time = NEW.r_time AND d_id = NEW.d_id; ELSE SIGNAL SQLSTATE '45000' SET MESSAGE_TEXT = 'Appointment limit exceeded'; END IF; END不想要updat那步，能不能把两次判断合并，一次性插入

可以将两次判断合并，可以使用IF语句的嵌套来实现。以下是修改后的代码：

BEGIN
DECLARE count INT;
SELECT COUNT(*) into count from reserve where r_time=NEW.r_time AND d_id=NEW.d_id;
SELECT renshu into @num from work where d_id=NEW.d_id AND work_start = CONCAT(DATE_FORMAT(NEW.r_time, '%W%H:%i')) LIMIT 1;
IF EXISTS (SELECT work_start FROM work WHERE work_start = CONCAT(DATE_FORMAT(NEW.r_time, '%W%H:%i')))
THEN
IF count <= @num
THEN
INSERT INTO reserve (r_id, p_id, d_id, r_time, r_status, r_out_num) VALUES (New.r_id, New.p_id, New.d_id, New.r_time, '已预约', @num - count);
ELSE
SIGNAL SQLSTATE '45000' SET MESSAGE_TEXT = 'Appointment limit exceeded';
END IF;
ELSE
SIGNAL SQLSTATE '45000' SET MESSAGE_TEXT = 'Data does not meet the requirements';
END IF;
END

在这个修改后的代码中，首先声明了count变量和@num变量，然后查询reserve表中符合条件的行数和work表中的人数限制。然后，使用IF语句的嵌套，将两次判断合并，并根据条件执行相应的操作。如果work表中存在符合条件的数据，则判断预约人数是否已达到人数限制，如果没有达到，则插入预约数据，并更新r_out_num字段；如果已达到，则抛出异常。如果work表中不存在符合条件的数据，则同样抛出异常。

BEGIN DECLARE count INT; SELECT COUNT(*) into count from reserve where r_time=NEW.r_time AND d_id=NEW.id; SELECT renshu into @num from work where d_id=NEW.id AND work_start = CONCAT(DATE_FORMAT(NEW.r_time, '%W%H:%i'))); IF (SELECT work_start FROM work WHERE work_start = CONCAT(DATE_FORMAT(r_time, '%W%H:%i'))) THEN INSERT INTO reserve (r_id, p_id, d_id, r_time, r_status,r_out_num ) VALUES (New.r_id, New.p_id, New.d_id, New.r_time, '已预约', null); ELSE SIGNAL SQLSTATE '45000' SET MESSAGE_TEXT = 'Data does not meet the requirements'; else IF count<=@num then update reserve set New.r_out_num=@num-count doctor_id = NEW.doctor_id AND CONCAT(DATE_FORMAT(NEW.r_time, '%W%H:%i'))); else SIGNAL SQLSTATE '45000' SET MESSAGE_TEXT = 'Appointment limit exceeded'; END IF; END有错

根据你提供的代码，我发现有一些错误，具体如下：

1. 在第三行 SELECT renshu into @num from work ... 中，应该加上 WHERE 条件来限定查询的范围。

2. 在第四行的 IF 语句中，应该使用 EXISTS 子句来判断表 work 中是否存在符合条件的数据。

3. 在第五行的 INSERT INTO 语句中，应该将 doctor_id = NEW.doctor_id AND CONCAT(DATE_FORMAT(NEW.r_time, '%W%H:%i')) 改为 SET doctor_id = NEW.doctor_id, r_out_num = null。

4. 在第七行的 ELSE IF 语句中，应该使用 UPDATE 语句来更新已有的预约记录。

5. 在第九行的 END IF 后面应该加上一个分号。

修改后的代码如下：

BEGIN
DECLARE count INT;
SELECT COUNT(*) into count from reserve where r_time=NEW.r_time AND d_id=NEW.id;
SELECT renshu into @num from work where d_id=NEW.id AND work_start = CONCAT(DATE_FORMAT(NEW.r_time, '%W%H:%i')) LIMIT 1;
IF EXISTS (SELECT work_start FROM work WHERE work_start = CONCAT(DATE_FORMAT(NEW.r_time, '%W%H:%i'))) THEN
INSERT INTO reserve (r_id, p_id, d_id, r_time, r_status, r_out_num) VALUES (New.r_id, New.p_id, New.d_id, New.r_time, '已预约', null);
ELSE
SIGNAL SQLSTATE '45000' SET MESSAGE_TEXT = 'Data does not meet the requirements';
END IF;

IF count <= @num THEN
UPDATE reserve SET r_out_num = @num - count, doctor_id = NEW.doctor_id WHERE r_time = NEW.r_time AND d_id = NEW.id;
ELSE
SIGNAL SQLSTATE '45000' SET MESSAGE_TEXT = 'Appointment limit exceeded';
END IF;
END;