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oracle的轉義字元 2009-08-03 13:35:51| 分類: sql | 標籤: |字型大小大
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oracle的轉義字元需要用escape函式來定義,小小學習一下:
sql> create table t_char(a varchar2(20));
sql> insert into t_char values('a_b');
sql> insert into t_char values('acb');
sql> insert into t_char values('a%b');
sql> insert into t_char values('a''b');
sql> insert into t_char values('a/b');
sql> insert into t_char values('a\b');
sql> insert into t_char values('%');
sql> insert into t_char values('_');
sql> insert into t_char values('a');
sql> commit;
sql> select * from t_char;
a--------------------
a_bacb
a%ba'b
a/ba\b%_
a sql> select * from t_char where a like 'a_b';
a--------------------
a_bacb
a%ba'b
a/ba\b
sql> select * from t_char where a like 'a\_b' escape '\';
a--------------------
a_b
--可見要查詢含有通配字元的字串,必須要使用escape函式
sql> select * from t_char where a like 'a\'b' escape '\';
error:
ora-01756: quoted string not properly terminated
sql> select * from t_char where a like 'a''b' escape '\';
a--------------------
a'b
--但是字元'還是需要用兩個''來代替字串中的單引號
sql> select * from t_char where a like 'ax_b' escape 'x';
a--------------------
a_b
sql> select * from t_char where a like 'a''_b' escape '''';
a--------------------
a_b
sql> select * from t_char where a like 'a_%b' escape '_';
a--------------------
a%b
--可以用其他字元,甚至是「'」、「_」、「%」來用作轉義字元,但是一般都使用\,以免發生邏輯錯誤
sql> select * from t_char where a like 'a\/b' escape '\';
select * from t_char where a like 'a\/b' escape '\'
*error at line 1:
ora-01424: missing or illegal character following the escape character
sql> select * from t_char where a like 'a_/b' escape '_';
select * from t_char where a like 'a_/b' escape '_'
*error at line 1:
ora-01424: missing or illegal character following the escape character
sql> select * from t_char where a like 'a//b' escape '/';
a--------------------
a/b
sql> select * from t_char where a like 'a/\b' escape '/';
select * from t_char where a like 'a/\b' escape '/'
*error at line 1:
ora-01424: missing or illegal character following the escape character
sql> select * from t_char where a like 'a\\b' escape '\';
a--------------------
a\b--要搜尋"/"或者"\"則必須使用與之相同的符號作為轉義字元,否則無效
基本上的使用方法就是這些了,還需要注意一點,這裡的escape函式,和sqlplus中的escape環境引數·毫·無·關·系·
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