sql - Oracle sql 终止符筛选(+奇怪的行为)

Question

我有一个疑问，请说这个

SELECT to_char(regexp_substr(q'{select * from dual minus select * from dual; select * from dual minus select * from dual;}'
, '[^;]+', 1, LEVEL)) FROM dual
CONNECT BY to_char(regexp_substr(q'{select * from dual minus select * from dual; select * from dual minus select * from dual;}', '[^;]+', 1, LEVEL)) IS NOT NULL;

它工作正常 - 分割我的行

select * from dual minus select * from dual; select * from dual minus select * from dual;

一分为二

select * from dual minus select * from dual
select * from dual minus select * from dual

一切都很好，直到我添加一些线制动器，就像这样

SELECT to_char(regexp_substr(q'{select * from dual minus select * from dual; 
select * from dual minus select * from dual;}'
, '[^;]+', 1, LEVEL)) FROM dual
CONNECT BY to_char(regexp_substr(q'{select * from dual minus select * from dual; 
select * from dual minus select * from dual;}', '[^;]+', 1, LEVEL)) IS NOT NULL;

这里就变成了 hell :sql 将字符串中的 ; 视为查询的实际结束，ORA-01756 之类的东西......

---

如果我在 ; 之后添加一个随机符号，一切都会恢复正常

SELECT to_char(regexp_substr(q'{select * from dual minus select * from dual;%
select * from dual minus select * from dual;}'
, '[^;]+', 1, LEVEL)) FROM dual
CONNECT BY to_char(regexp_substr(q'{select * from dual minus select * from dual;%
select * from dual minus select * from dual;}', '[^;]+', 1, LEVEL)) IS NOT NULL;

请解释此行为并提出解决方法。

UPD:在不同的 IDE 中尝试过此操作(SQL 开发人员而不是 PL/SQL 开发人员)。没有错误。也许这一切都与编码有关......
UPD2:在这种情况下，SQLPlus 的工作方式与 PL/SQL 开发人员的工作方式相同。 SQL 开发人员似乎更“聪明”一些。尽管如此，还是不​​知道为什么。

Answer 1

尝试:

SELECT to_char(regexp_substr(q'{select * from dual minus select * from dual;
select * from dual minus select * from dual;}'
, '[^;[:cntrl:]]+', 1, LEVEL)) FROM dual
CONNECT BY to_char(regexp_substr(q'{select * from dual minus select * from dual;
select * from dual minus select * from dual;}', '[^;[:cntrl:]]+', 1, LEVEL)) IS NOT NULL;

输出:

select * from dual minus select * from dual
select * from dual minus select * from dual

原因是 regexp_substr 查找您指定的下一个模式，在您的情况下最初是 [^;]+ 并且该​​模式会找到 ;下一个字符将是换行符。如果您想像这样分解行，简单的解决方案是通过 [:cntrl:] 在正则表达式搜索中排除控制字符