为什么 sqlplus 变量在句点上表现得很好笑？

Question

为什么 sqplus 变量在尝试在其后使用句点时表现得很滑稽？

SQL> set define on
SQL> accept goo char prompt 'goo: ';
goo: mygoo
SQL> select '&goo' from dual;
old   1: select '&goo' from dual
new   1: select 'mygoo' from dual

MYGO
-----
mygoo

SQL> select '&goo something' from dual;
old   1: select '&goo something' from dual
new   1: select 'mygoo something' from dual

MYGOOSOMETHING
---------------
mygoo something

SQL> select '&goo.something' from dual;
old   1: select '&goo.something' from dual
new   1: select 'mygoosomething' from dual

MYGOOSOMETHIN
--------------
mygoosomething

SQL> select '&goo..something' from dual;
old   1: select '&goo..something' from dual
new   1: select 'mygoo.something' from dual

MYGOO.SOMETHIN
---------------
mygoo.something

为什么我必须加倍来月经？有没有更好的方法？

Answer 1

这根本有趣，但这是预期的默认行为。

SET CONCAT 字符是句点（除非您将其设置为其他字符）。如果要在替换变量之后添加一个句点，则必须使用两个连续的句点。

如果您将连接字符设置为例如#，然后周期行为正常：

SQL> set concat '#'
SQL> select '&goo.' from dual;
old   1: select '&goo.' from dual
new   1: select 'mygoo.' from dual

'MYGOO
------
mygoo.

如果您将其设置回句号，它又会表现得有趣：

SQL> set concat '.'
SQL> select '&goo.' from dual;
old   1: select '&goo.' from dual
new   1: select 'mygoo' from dual

'MYGO
-----
mygoo

SQL> select '&goo..' from dual;
old   1: select '&goo..' from dual
new   1: select 'mygoo.' from dual

'MYGOO
------
mygoo.

最后，回到#，它也表现得有趣，你必须使用其中两个：

SQL> set concat '#'
SQL> select '&goo#' from dual;
old   1: select '&goo#' from dual
new   1: select 'mygoo' from dual

'MYGO
-----
mygoo

SQL> select '&goo##' from dual;
old   1: select '&goo##' from dual
new   1: select 'mygoo#' from dual

'MYGOO
------
mygoo#

SQL>

为什么 sqlplus 变量在句点上表现得很好笑？

why do sqlplus variables act funny with a period?

oracle

sqlplus