群里有人询问，在mysql的proc中如何获取错误信息、错误编号呢?我们知道在oracle、mssql中比较简单；
oracle中sqlcode,sqlerrm ;mssql中ERROR_PROCEDURE(), ERROR_MESSAGE();
那么在mysql中呢？
下面给出示例：
mysql> show create procedure proc_6G
*************************** 1. row ***************************
Procedure: proc_6
sql_mode: STRICT_TRANS_TABLES,NO_ENGINE_SUBSTITUTION
Create Procedure: CREATE DEFINER=`root`@`192.168.6.%` PROCEDURE `proc_6`()
LANGUAGE SQL
begin
DECLARE code CHAR(5) DEFAULT '00000';
DECLARE msg TEXT;
declare pout double;
DECLARE continue HANDLER FOR SQLEXCEPTION
BEGIN
GET DIAGNOSTICS CONDITION 1 --通过GET DIAGNOSTICS这样的方式获取sqlstate message_text(当然错误信息错误编号可以自己定义)
--参考我的另外一个示例
------------------------------
drop FUNCTION if exists test.fn_get_random_str;
create function fn_get_random_str(f_len int)
returns varchar(4000)
no sql
begin
declare v_str varchar(52);
declare v_cnt int;
declare f_result varchar(4000);
/*自定义异常编码40001:value_to_large*/
declare value_to_large condition for sqlstate '40001';
if f_len>4000 then
begin
signal sqlstate '40001'
set message_text='value_to_large';/*输出错误信息40001：value_to_large*/
end ;
end if ;
set v_str='abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
set v_cnt=1;
set f_result='';
while v_cnt<=f_len do
set f_result=concat(substr(v_str,round(rand()*52,0),1),f_result);
set v_cnt=v_cnt+1;
end while ;
return f_result ;
end ;
mysql> select fn_get_random_str(5000);
ERROR 1644 (40001): value_to_large
------------------------------
code = RETURNED_SQLSTATE, msg = MESSAGE_TEXT;
END;
/*set pout= 1/0;*/
select 1/0 into pout from test.ttt ; --模拟了一个不存在的表错误
select concat(code,msg) ;
end
character_set_client: utf8
collation_connection: utf8_general_ci
Database Collation: latin1_swedish_ci
1 row in set (0.28 sec)
mysql> call test.proc_6();
+-------------------------------------+
| concat(code,msg) |
+-------------------------------------+
| 42S02Table 'test.ttt' doesn't exist | --看到了吧错误信息打印出来了
+-------------------------------------+
1 row in set (0.99 sec)
Query OK, 0 rows affected (0.99 sec)
咋样满足需求了吧！