MySQL基础：搭建bc网站sql执行错误时的控制方式

行语句的正常执行

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比如执行多条正常执行的语句，示例命令如下所示：

  select version();

  select "Hello LiuMiao" as "Greetings";

  select 20+22 as Result;

使用HereDocument方式执行如下所示：

liumiaocn:~ liumiao$ MySQL -uroot -proot <

>   select version();

>   select "Hello LiuMiao" as "Greetings";

>   select 20+22 as Result;

> EOF

mysql: [Warning] Using a password on the command line interface can be insecure.

version()

8.0.11

Greetings

Hello LiuMiao

Result

42

liumiaocn:~ liumiao$ 

多行语句中间出错时的缺省动作

Oracle多行语句执行出错时在sqlplus中会继续执行，而在mysql控制台中会怎样呢？我们可以在上述语句中添加一行错误的语法或者命令来进行验证：

mysql -uroot -proot <

  select version();

  errorcommand;

  select "Hello LiuMiao" as "Greetings";

  select 20+22 as Result;

EOF

执行结果如下所示

liumiaocn:~ liumiao$ mysql -uroot -proot <

>   select version();

>   errorcommand;

>   select "Hello LiuMiao" as "Greetings";

>   select 20+22 as Result;

> EOF

mysql: [Warning] Using a password on the command line interface can be insecure.

version()

8.0.11

ERROR 1064 (42000) at line 2: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'errorcommand' at line 1

liumiaocn:~ liumiao$ 

可以看到，缺省情况下碰到错误就停下来了。

WHENEVER SQLERROR

在oracle中通过WHENEVER SQLERROR来进行控制。语法如下所示

WHENEVER SQLERROR {EXIT [SUCCESS | FAILURE | WARNING | n | variable | :BindVariable] [COMMIT | ROLLBACK] | CONTINUE [COMMIT | ROLLBACK | NONE]}