Oracle escape函数的使用

ERROR at line 1:ORA-01424: missing or illegal character following the escape characterSQLgt; select * from t_char where

SQL> select * from t_char;A
——————–
a_b
acb
a%b
a’b
a/b
a\b
%
_
aSQL> select * from t_char where a like ‘a_b’;A
——————–
a_b
acb
a%b
a’b
a/b
a\bSQL> select * from t_char where a like ‘a\_b’ escape ‘\’;A
——————–
a_b–可见要查询含有通配字符的字符串，必须要使用escape函数 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–但是字符’还是需要用两个”来代替字符串中的单引号 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 –可以用其他字符，甚至是“’”、“_”、“%”来用作转义字符，但是一般都使用\，以免发生逻辑错误 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/bSQL> 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 characterSQL> select * from t_char where a like ‘a\\b’ escape ‘\’;A
——————–
a\b
–要搜索”/”或者”\”则必须使用与之相同的符号作为转义字符，，否则无效 基本上的使用方法就是这些了，还需要注意一点，这里的escape函数，和sqlplus中的escape环境参数毫无关系
SQL> show escape
escape OFF

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