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MySQL異常處理淺析

 更新時(shí)間：2014年06月25日 10:35:05   投稿：shichen2014  
這篇文章主要介紹了MySQL的異常處理,需要的朋友可以參考下

MySQL的異常處理分析如下：

標(biāo)準(zhǔn)格式

DECLARE handler_type HANDLER FOR condition_value[,...] statement
handler_type:
  CONTINUE
 | EXIT
 | UNDO --這個(gè)暫時(shí)不支持
condition_value:
  SQLSTATE [VALUE] sqlstate_value
 | condition_name
 | SQLWARNING
 | NOT FOUND
 | SQLEXCEPTION
 | mysql_error_code
condition_value細(xì)節(jié)

1、常用MYSQL ERROR CODE 列表

http://dev.mysql.com/doc/refman/5.0/en/error-messages-server.html
更多錯(cuò)誤列表見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(biāo)準(zhǔn).
并不是所有的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(cuò)誤代碼
NOT FOUND 代表所有以02開頭的錯(cuò)誤代碼，當(dāng)然也可以代表一個(gè)游標(biāo)到達(dá)數(shù)據(jù)集的末尾。
SQLEXCEPTION 代表除了SQLWARNING和NOT FOUND 的所有錯(cuò)誤代碼

3、我們現(xiàn)在就用手冊上的例子

CREATE TABLE t (s1 int,primary key (s1));
mysql> use t_girl
Database changed
mysql> 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; -- 遇到重復(fù)鍵值就退出
  -> 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(xiàn)在來看一下遇到錯(cuò)誤繼續(xù)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(zhí)行到最后。
當(dāng)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

此列沒有默認(rèn)值，插入的時(shí)候會出現(xiàn)警告或者1364錯(cuò)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(cuò)誤的時(shí)候插入的新記錄。

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

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