mysql - 错误代码 1265 没有进入异常 block 而是从程序中出来

Question

我有以下示例代码，但在处理异常时，我看到了 varchar 和整数列的不同行为。

我正在从表中获取姓名和工资列值，但我已声明 过程中小于表列大小的变量。

因此对于整数列，我收到以下错误

1264 |错误 1264 (22003):“v_sal”列的值超出范围

它正在进入我在过程中编码的异常 block

但是对于 varchar 列，我收到以下错误

错误 1265 (01000):第 1 行“v_ename”列的数据被截断

但它没有进入我的异常 block 而是抛出错误 并退出程序

为什么会有这样的行为，我必须如何处理这个 varchar 场景，它应该进入我的异常 block 而不是突然出现。

我使用的是MySQL 5.7

Table structure

 empid  int(4) 
 ename  varchar(10)              
 sal    smallint(6)  




CREATE  PROCEDURE samp_proc(in p_empno int(4),
                            out p_sal smallint,
                            out p_error_code INT,
                            out p_errmsg  VARCHAR(500)
 ) 

BEGIN

declare v_ename varchar(3);

declare v_sal tinyint;

DECLARE EXIT HANDLER FOR SQLEXCEPTION

 begin  
    GET DIAGNOSTICS CONDITION 1  @sqlstate = RETURNED_SQLSTATE, 
    @errno = MYSQL_ERRNO, @text = MESSAGE_TEXT;

SET @full_error = CONCAT("ERROR ", @errno, " (", @sqlstate, "): ", @text);

    set p_error_code = @errno;

    set p_errmsg = @full_error ;

  select p_error_code,p_errmsg;

  rollback;
 end;


select ename,sal into v_ename,v_sal from kk_chk where empid = p_empno;

  /* since ename is first in the fetch the varchar behavior takes the precedence
     if we make sal column as first in the fetch the integer behavior takes the precdednce */


end $$

delimiter ;

感谢和问候

Karthikeyan.R

Answer 1

我认为错误 block 的行为符合预期。 给定

MariaDB [sandbox]> select * from users;
+------+------+----------+-------+-----------+----------+---------+
| id   | name | password | email | firstname | lastname | sal     |
+------+------+----------+-------+-----------+----------+---------+
|    1 | aaa  | NULL     | NULL  | aaa       | aaa      | 1000000 |
|    2 | bbbb | NULL     | NULL  | NULL      | NULL     | 1000000 |
+------+------+----------+-------+-----------+----------+---------+
2 rows in set (0.00 sec)

这个程序略有修改

drop procedure if exists samp_proc;
delimiter $$

CREATE  PROCEDURE samp_proc(
    in p_empno int(4)
    #,out p_sal smallint,out p_error_code INT,out p_errmsg  VARCHAR(500)
 ) 
BEGIN
declare v_ename varchar(3);
declare v_sal tinyint;
declare v_id int;
DECLARE EXIT HANDLER FOR SQLEXCEPTION

 begin  
    GET DIAGNOSTICS CONDITION 1  @sqlstate = RETURNED_SQLSTATE, 
    @errno = MYSQL_ERRNO, @text = MESSAGE_TEXT;

    SET @full_error = CONCAT("ERROR ", @errno, " (", @sqlstate, "): ", @text);
    #set p_error_code = @errno;
    #set p_errmsg = @full_error ;
     #select p_error_code,p_errmsg;
     select 'error block message - ' ,@errno,@full_error;
#  rollback;
 end;

    select name,sal,id into v_ename,v_sal,v_id from users where id = p_empno;

  /* since ename is first in the fetch the varchar behavior takes the precedence
     if we make sal column as first in the fetch the integer behavior takes the precdednce */
end $$

delimiter ;

产生这些结果

MariaDB [sandbox]> call samp_proc(1);
+------------------------+--------+--------------------------------------------------------------------+
| error block message -  | @errno | @full_error                                                        |
+------------------------+--------+--------------------------------------------------------------------+
| error block message -  |   1264 | ERROR 1264 (22003): Out of range value for column 'v_sal' at row 1 |
+------------------------+--------+--------------------------------------------------------------------+
1 row in set (0.00 sec)

Query OK, 0 rows affected (0.01 sec)

MariaDB [sandbox]>
MariaDB [sandbox]> call samp_proc(2);
+------------------------+--------+-----------------------------------------------------------------+
| error block message -  | @errno | @full_error                                                     |
+------------------------+--------+-----------------------------------------------------------------+
| error block message -  |   1406 | ERROR 1406 (22001): Data too long for column 'v_ename' at row 2 |
+------------------------+--------+-----------------------------------------------------------------+
1 row in set (0.00 sec)

Query OK, 0 rows affected (0.00 sec)

也许我的模型有误，但对我来说看起来不错。