default-character-set=gbk ,setBytes() cause SQL syntax error.

[Zhao Bin]

hi all,
When I use "default-character-set=gbk" in my.ini file, and use below code, it was throw SQLException, like this:
java.sql.SQLException: Syntax error or access violation message from server: "You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '歗鉉毩n隲0n>?7煻?孴\\b(痢耟? ?8錞圧??.鍾Q,蘧溎+?!穝+壟,/柕?伔Tb┍_?' at line 1"
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:1997)
at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1167)
at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:1278)
at com.mysql.jdbc.Connection.execSQL(Connection.java:2247)
at com.mysql.jdbc.PreparedStatement.execute(PreparedStatement.java:1371)
at net.risesoft.ZhaoBinTest.main(ZhaoBinTest.java:46)

here is the java code:
Class.forName("com.mysql.jdbc.Driver").newInstance();
Connection conn = DriverManager.getConnection("jdbc:mysql://localhost/risenet?user=root&password=1234&useUnicode=true&characterEncoding=gbk");
String sql = "insert into test1 values('zs', ?);";
PreparedStatement stmt = conn.prepareStatement(sql);
byte[] buf = FileUtil.readFile("C:\\temp\\demo\\test.doc");
stmt.setBytes(1, buf);
stmt.execute();
stmt.clearParameters();
stmt.close();
conn.close();

But, when I change the characterEncoding to ISO8859_1 or latin1(also remove "default-character-set=gbk" in my.ini),it works fine. My native language is chinese, in my application must use gbk. how can I duel with it ?

Any suggestion is welcome.

thanks a lot.