MySQL異常處理淺析_Mysql

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MySQL的異常處理分析如下:

標準格式

DECLARE handler_type HANDLER FOR condition_value[,...] statementhandler_type:  CONTINUE | EXIT | UNDO --這個暫時不支援condition_value:  SQLSTATE [VALUE] sqlstate_value | condition_name | SQLWARNING | NOT FOUND | SQLEXCEPTION | mysql_error_codecondition_value細節

1、常用MYSQL ERROR CODE 列表

http://dev.mysql.com/doc/refman/5.0/en/error-messages-server.html
更多錯誤清單見MySQL安裝路徑下
比如我的/usr/local/mysql/share/mysql/errmsg.txt
說明一下:SQLSTATE [VALUE] sqlstate_value這種格式是專門為ANSI SQL 和 ODBC以及其他的標準.
並不是所有的MySQL ERROR CODE 都映射到SQLSTATE。

2、如果你不想插ERROR CODE的話,就用速記條件來代替

SQLWARNING 代表所有以01開頭的錯誤碼
NOT FOUND 代表所有以02開頭的錯誤碼,當然也可以代表一個遊標到達資料集的末尾。
SQLEXCEPTION 代表除了SQLWARNING和NOT FOUND 的所有錯誤碼

3、我們現在就用手冊上的例子

CREATE TABLE t (s1 int,primary key (s1));mysql> use t_girlDatabase changedmysql> CREATE TABLE t (s1 int,primary key (s1));Query OK, 0 rows affected (0.00 sec)mysql> mysql> mysql> DELIMITER ||mysql> CREATE PROCEDURE handlerdemo ()  -> BEGIN  -> DECLARE EXIT HANDLER FOR SQLSTATE '23000' BEGIN END; -- 遇到重複索引值就退出  -> SET @x = 1;  -> INSERT INTO t VALUES (1);  -> SET @x = 2;  -> INSERT INTO t VALUES (1);  -> SET @x = 3;  -> END||Query OK, 0 rows affected (0.00 sec)mysql> DELIMITER ;mysql> call handlerdemo();Query OK, 0 rows affected (0.00 sec)mysql> select @x;+------+| @x |+------+| 2 | +------+1 row in set (0.00 sec)mysql> call handlerdemo();Query OK, 0 rows affected (0.00 sec)mysql> select @x;+------+| @x |+------+| 1 | +------+1 row in set (0.00 sec)mysql> 

現在來看一下遇到錯誤繼續的情況

mysql> truncate table t;Query OK, 0 rows affected (0.01 sec)mysql> DELIMITER $$mysql> DROP PROCEDURE IF EXISTS `t_girl`.`handlerdemo`$$Query OK, 0 rows affected (0.00 sec)mysql> CREATE DEFINER=`root`@`localhost` PROCEDURE `handlerdemo`()  -> BEGIN  -> DECLARE CONTINUE HANDLER FOR SQLSTATE '23000' BEGIN END;  -> SET @x = 1;  -> INSERT INTO t VALUES (1);  -> SET @x = 2;  -> INSERT INTO t VALUES (1);  -> SET @x = 3;  -> END$$Query OK, 0 rows affected (0.01 sec)mysql> DELIMITER ;mysql> call handlerdemo();Query OK, 0 rows affected (0.00 sec)mysql> select @x;+------+| @x |+------+| 3 | +------+1 row in set (0.00 sec)mysql> call handlerdemo();Query OK, 0 rows affected (0.00 sec)mysql> select @x;+------+| @x |+------+| 3 | +------+1 row in set (0.00 sec)mysql> 

可以看到,始終執行到最後。
當然,上面的SQLSTATE '23000'可以替換為1062
我們來看一下警告。

mysql> alter table t add s2 int not null;Query OK, 0 rows affected (0.01 sec)Records: 0 Duplicates: 0 Warnings: 0

此列沒有預設值,插入的時候會出現警告或者1364錯誤提示。

mysql> DELIMITER $$mysql> DROP PROCEDURE IF EXISTS `t_girl`.`handlerdemo`$$Query OK, 0 rows affected, 1 warning (0.00 sec)mysql> CREATE DEFINER=`root`@`localhost` PROCEDURE `handlerdemo`()  -> BEGIN  -> DECLARE CONTINUE HANDLER FOR 1062 BEGIN END;  -> DECLARE CONTINUE HANDLER FOR SQLWARNING  -> BEGIN  -> update t set s2 = 2;  -> END;  -> DECLARE CONTINUE HANDLER FOR 1364  -> BEGIN  -> INSERT INTO t(s1,s2) VALUES (1,3);  -> END;   -> SET @x = 1;  -> INSERT INTO t(s1) VALUES (1);  -> SET @x = 2;  -> INSERT INTO t(s1) VALUES (1);  -> SET @x = 3;  -> END$$Query OK, 0 rows affected (0.00 sec)mysql> DELIMITER ;mysql> call handlerdemo();Query OK, 0 rows affected (0.00 sec)mysql> select * from t;+----+----+| s1 | s2 |+----+----+| 1 | 3 | +----+----+1 row in set (0.00 sec)

遇到錯誤的時候插入的新記錄。

mysql> select @x;+------+| @x |+------+| 3 | +------+1 row in set (0.00 sec)
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