PL/SQL Developer
工具设置: Tool -> preferences -> Fonts (Grid , Editor) 编码设置
查看数据库的服务端与客户端编码
服务端: select * from v$nls_parameters;
NLS_LANGUAGE = JAPANESE
客户端:注册表(regedit) -> HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\ORACLE\HOME1
NLS_LANG = JAPANESE_JAPAN.JA16SJIS