在DB内部存储的时候，肯定全是unicdoe，但是客户端可不只是java.
控制台上运行ij的时候，最好指定一下字符集。
我改完的shift-jis版本的ij.bat:
:runNoClasspath
"%_JAVACMD%" %DERBY_OPTS% -Dderby.ui.locale=ja_JP
-Dderby.ui.codeset=SJIS -classpath "%LOCALCLASSPATH%"
org.apache.derby.tools.ij %DERBY_ARGS% %DERBY_CMD_LINE_ARGS%
goto end
:runWithClasspath
"%_JAVACMD%" %DERBY_OPTS% -Dderby.ui.locale=ja_JP
-Dderby.ui.codeset=SJIS -classpath "%CLASSPATH%;%LOCALCLASSPATH%"
org.apache.derby.tools.ij %DERBY_ARGS% %DERBY_CMD_LINE_ARGS%
goto end
参考站点：
http://db.apache.org/derby/docs/dev/tools/rtoolsijpropref97949.html
The following command specifies to run ij using the Japanese territory
(derby.ui.locale=ja_JP) using Japanese Latin Kanji mixed encoding
(codeset=Cp939):
java -Dderby.ui.locale=ja_JP -Dderby.ui.codeset=SJIS
-Dij.protocol=jdbc:derby:
org.apache.derby.tools.ij
The following table contains a sampling of character encodings.
Supported encodings vary from product to product. For example, to see
the full list of the character encodings that are supported by the Java
Platform, Standard Edition 6 Software Development Kit, go to http://download.oracle.com/javas ... /encoding.doc.html.