多條sql執行時如果在中間的語句出現錯誤，后續會不會直接執行，如何進行設定，以及其他數據庫諸如Mysql是如何對應的，這篇文章將會進行簡單的整理和說明。
環境準備
使用Oracle的精簡版創建docker方式的demo環境，詳細可參看：
- https://www.jb51.net/article/153533.htm
多行語句的正常執行
對上篇文章創建的兩個字段的學生信息表，正常添加三條數據，詳細如下：
# sqlplus system/liumiao123@XE EOF
> desc student
> select * from student;
> insert into student values (1001, 'liumiaocn');
> insert into student values (1002, 'liumiao');
> insert into student values (1003, 'michael');
> commit;
> select * from student;
> EOF
SQL*Plus: Release 11.2.0.2.0 Production on Sun Oct 21 12:08:35 2018
Copyright (c) 1982, 2011, Oracle. All rights reserved.
Connected to:
Oracle Database 11g Express Edition Release 11.2.0.2.0 - 64bit Production
SQL> Name Null? Type
----------------------------------------- -------- ----------------------------
STUID NOT NULL NUMBER(4)
STUNAME VARCHAR2(50)
SQL>
no rows selected
SQL>
1 row created.
SQL>
1 row created.
SQL>
1 row created.
SQL>
Commit complete.
SQL>
STUID STUNAME
---------- --------------------------------------------------
1001 liumiaocn
1002 liumiao
1003 michael
SQL> Disconnected from Oracle Database 11g Express Edition Release 11.2.0.2.0 - 64bit Production
#
多行語句中間出錯時的缺省動作
問題：
三行insert語句，如果中間的一行出錯，缺省的狀況下第三行會不會被插入進去？
我們將第二條insert語句的主鍵故意設定重復，然后進行確認第三條數據是否會進行插入即可。
# sqlplus system/liumiao123@XE EOF
desc student
delete from student;
select * from student;
insert into student values (1001, 'liumiaocn');
insert into student values (1001, 'liumiao');
insert into student values (1003, 'michael');
select * from student;
commit;> > > > >
> EOF
SQL*Plus: Release 11.2.0.2.0 Production on Sun Oct 21 12:15:16 2018
Copyright (c) 1982, 2011, Oracle. All rights reserved.
Connected to:
Oracle Database 11g Express Edition Release 11.2.0.2.0 - 64bit Production
SQL> Name Null? Type
----------------------------------------- -------- ----------------------------
STUID NOT NULL NUMBER(4)
STUNAME VARCHAR2(50)
SQL>
2 rows deleted.
SQL>
no rows selected
SQL>
1 row created.
SQL> insert into student values (1001, 'liumiao')
*
ERROR at line 1:
ORA-00001: unique constraint (SYSTEM.SYS_C007024) violated
SQL>
1 row created.
SQL>
STUID STUNAME
---------- --------------------------------------------------
1001 liumiaocn
1003 michael
SQL> SQL> Disconnected from Oracle Database 11g Express Edition Release 11.2.0.2.0 - 64bit Production
#
結果非常清晰地表明是會繼續執行的，在oracle中通過什么來對其進行控制呢？
WHENEVER SQLERROR
答案很簡單，在oracle中通過WHENEVER SQLERROR來進行控制。
WHENEVER SQLERROR {EXIT [SUCCESS | FAILURE | WARNING | n | variable | :BindVariable] [COMMIT | ROLLBACK] | CONTINUE [COMMIT | ROLLBACK | NONE]}
WHENEVER SQLERROR EXIT
添加此行設定，即會在失敗的時候立即推出，接下來我們進行確認：
# sqlplus system/liumiao123@XE EOF
WHENEVER SQLERROR EXIT
desc student
delete from student;
select * from student;
insert into student values (1001, 'liumiaocn');
insert into student values (1001, 'liumiao');
insert into student values (1003, 'michael');
select * from student;
commit;> > > > > > > > >
> EOF
SQL*Plus: Release 11.2.0.2.0 Production on Sun Oct 21 12:27:15 2018
Copyright (c) 1982, 2011, Oracle. All rights reserved.
Connected to:
Oracle Database 11g Express Edition Release 11.2.0.2.0 - 64bit Production
SQL> SQL> Name Null? Type
----------------------------------------- -------- ----------------------------
STUID NOT NULL NUMBER(4)
STUNAME VARCHAR2(50)
SQL>
2 rows deleted.
SQL>
no rows selected
SQL>
1 row created.
SQL> insert into student values (1001, 'liumiao')
*
ERROR at line 1:
ORA-00001: unique constraint (SYSTEM.SYS_C007024) violated
Disconnected from Oracle Database 11g Express Edition Release 11.2.0.2.0 - 64bit Production
#
WHENEVER SQLERROR CONTINUE
使用CONTINUE則和缺省方式下的行為一致，出錯仍然繼續執行
# sqlplus system/liumiao123@XE EOF
WHENEVER SQLERROR CONTINUE
desc student
delete from student;
select * from student;
insert into student values (1001, 'liumiaocn');
insert into student values (1001, 'liumiao');
insert into student values (1003, 'michael');
select * from student;
commit;> > > > > > > > >
> EOF
SQL*Plus: Release 11.2.0.2.0 Production on Sun Oct 21 12:31:54 2018
Copyright (c) 1982, 2011, Oracle. All rights reserved.
Connected to:
Oracle Database 11g Express Edition Release 11.2.0.2.0 - 64bit Production
SQL> SQL> Name Null? Type
----------------------------------------- -------- ----------------------------
STUID NOT NULL NUMBER(4)
STUNAME VARCHAR2(50)
SQL>
1 row deleted.
SQL>
no rows selected
SQL>
1 row created.
SQL> insert into student values (1001, 'liumiao')
*
ERROR at line 1:
ORA-00001: unique constraint (SYSTEM.SYS_C007024) violated
SQL>
1 row created.
SQL>
STUID STUNAME
---------- --------------------------------------------------
1001 liumiaocn
1003 michael
SQL>
Commit complete.
SQL> Disconnected from Oracle Database 11g Express Edition Release 11.2.0.2.0 - 64bit Production
#
Mysql中類似的機制
mysql中使用source是否提供相關的類似機制的問題中，最終引入了Oracle此項功能在mysql中引入的建議，詳細請參看：
- https://bugs.mysql.com/bug.php?id=73177
所以目前這只是一個sqlplus端的強化功能，并非標準，不同數據庫需要確認相應的功能是否存在。
小結
Oracle中使用WHENEVER SQLERROR進行出錯控制是否繼續，本文給出的例子非常簡單，詳細功能的使用可根據文中列出的Usage進行自行驗證和探索。
總結
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