xx’自定义错误信息,db2如何实现自定义错误?
答:使用signal SQLSTATE 'ii0002' set message_text = ‘dddd’; 指定SQLSTATE信息返回自定义的错误信息。 注意sqlstate 必须是 5 位字符,可以是 0 – 9 ,不允许大写字符A-Z和其他特殊字符。不允许前两个字符是‘00’。Message_text 信息限制在70字节长度。
举例如下
CREATE PROCEDURE raise ( IN rating INTEGER )
LANGUAGE SQL
BEGIN
DECLARE new_salary DECIMAL(9,2);
DECLARE service DECIMAL(8,0);
DECLARE v_empno CHAR(6) DEFAULT '123456';
SELECT salary, current_date - hiredate
INTO new_salary, service
FROM employee
WHERE empno = v_empno;
IF service < 600
THEN SIGNAL SQLSTATE 'II001'
SET MESSAGE_TEXT = 'Insufficient time in service.';
END IF;
IF rating = 1
THEN SET new_salary =
new_salary + (new_salary * .10);
ELSEIF rating = 2
THEN SET new_salary =
new_salary + (new_salary * .05);
END IF;
UPDATE employee
SET salary = new_salary
WHERE empno = v_empno;
END;
28.Db2中return的限制和使用?
答: return 不允许在触发器中使用。
29.Db2中如何创建trigger?
答:Db2的trigger 和Sybase 的触发器有些区别,Sybase中触发器全部市after方式。
Db2可以定义触发器的触发时机(after,before)
具体格式:
create Trigger info_plu_ti after insert on info_plu_tab Referencing New as new for each row
30.Db2的CASE 控制语句用法和例子?
答:用法举例如下:
CASE evaluation
WHEN 100 THEN UPDATE employee SET salary = salary * 1.3;
WHEN 90 THEN UPDATE employee SET salary = salary * 1.2;
WHEN 80 THEN UPDATE employee SET salary = salary * 1.1;
ELSE UPDATE employee SET salary = salary * 1.05;
END CASE;
或者:
CASE
WHEN evaluation = 100 THEN UPDATE employee SET salary = salary * 1.3;
WHEN evaluation = 90 THEN UPDATE employee SET salary = salary * 1.2;
WHEN evaluation = 80 THEN UPDATE employee SET salary = salary * 1.1;
ELSE UPDATE employee SET salary = salary * 1.05;
END CASE;
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