Question

我在oracle＆＃39; official document中找到了这个：

只有ASCII等效的下划线（_）和百分号（％）字符被识别为模式匹配字符。他们的全宽变种，出现在东亚字符集和Unicode中，被视为普通人物。

但奇怪的是，我的全宽百分比符号％的作用就像半宽％，下面是我的java代码：

Class.forName( "oracle.jdbc.driver.OracleDriver" );
Connection conn = DriverManager.getConnection( "jdbc:oracle:thin:@******", "***", "***" );
Statement stmt = conn.createStatement();
stmt.execute("select * from v$nls_parameters");
ResultSet rs = stmt.getResultSet();
while(rs.next()) {
    System.out.println(rs.getString(1) + ": " + rs.getString(2));
}
stmt.execute("select * from dual where '123' like '12％'");
rs = stmt.getResultSet();
while(rs.next()) {
    System.out.println(rs.getString(1));
}

输出结果为：

NLS_LANGUAGE: JAPANESE
NLS_TERRITORY: JAPAN
NLS_CURRENCY: ¥
NLS_ISO_CURRENCY: JAPAN
NLS_NUMERIC_CHARACTERS: .,
NLS_CALENDAR: GREGORIAN
NLS_DATE_FORMAT: RR-MM-DD
NLS_DATE_LANGUAGE: JAPANESE
NLS_CHARACTERSET: AL32UTF8
NLS_SORT: BINARY
NLS_TIME_FORMAT: HH24:MI:SSXFF
NLS_TIMESTAMP_FORMAT: RR-MM-DD HH24:MI:SSXFF
NLS_TIME_TZ_FORMAT: HH24:MI:SSXFF TZR
NLS_TIMESTAMP_TZ_FORMAT: RR-MM-DD HH24:MI:SSXFF TZR
NLS_DUAL_CURRENCY: \
NLS_NCHAR_CHARACTERSET: UTF8
NLS_COMP: BINARY
NLS_LENGTH_SEMANTICS: BYTE
NLS_NCHAR_CONV_EXCP: FALSE
X

但奇怪的是，在sqlplus中：

SQL> select * from dual where '123' like '12％';

no rows selected

而且，会话的nls参数现在不同了：

SQL> select * from v$nls_parameters;

PARAMETER                               VALUE
-------------------------------------   ----------------------------------------------------------------
NLS_LANGUAGE                            AMERICAN
NLS_TERRITORY                           AMERICA
NLS_CURRENCY                            $
NLS_ISO_CURRENCY                        AMERICA
NLS_NUMERIC_CHARACTERS                  .,
NLS_CALENDAR                            GREGORIAN
NLS_DATE_FORMAT                         DD-MON-RR
NLS_DATE_LANGUAGE                       AMERICAN
NLS_CHARACTERSET                        AL32UTF8
NLS_SORT                                BINARY
NLS_TIME_FORMAT                         HH.MI.SSXFF AM
NLS_TIMESTAMP_FORMAT                    DD-MON-RR HH.MI.SSXFF AM
NLS_TIME_TZ_FORMAT                      HH.MI.SSXFF AM TZR
NLS_TIMESTAMP_TZ_FORMAT                 DD-MON-RR HH.MI.SSXFF AM TZR
NLS_DUAL_CURRENCY                       $
NLS_NCHAR_CHARACTERSET                  UTF8
NLS_COMP                                BINARY
NLS_LENGTH_SEMANTICS                    BYTE
NLS_NCHAR_CONV_EXCP                     FALSE

19 rows selected.

非常感谢任何帮助。

Answer 1

我建议转义特殊字符％_（加上转义字符本身），比如

从*中选择*，其中'123'喜欢'12 \％'逃脱'\'

oracle 11gR2全宽度百分号签到like子句

1 个答案: