mysql挿入中国語読み込み中国語文字化けし1

OS: windows XP  ,  IDE : MyEclipse  , WebSever :Tomcat 6.0 .
mysql:5.0ドライババージョン;mysql-connector-java-3.1.13-bin.jar .
中国語の問題解決を挿入できません(中国語の文字が長すぎます):mysql.ini中将
default-character-set=gb2312;
例:

mysql> create  database  mydb;
Query OK, 1 row affected (0.00 sec)

mysql> use mydb;
Database changed
mysql> create  table    myuser(
    ->  id int   not  null  auto_increment  primary  key,
    -> username  varchar(50)  not null ,
    -> age  int  not  null,
    -> sex  varchar(4)  not null);
Query OK, 0 rows affected (0.08 sec)
mysql> insert into   myuser(username, age , sex)  values( 'liyaxi', 30 ,' ');
Query OK, 1 row affected (0.03 sec)

mysql> select *from  myuser;
+----+----------+-----+-----+
| id | username | age | sex |
+----+----------+-----+-----+
|  1 | liyaxi   |  30 |    |
+----+----------+-----+-----+
1 row in set (0.00 sec)

mysql> insert into   myuser(username, age , sex)  values( '   ', 30 ,' ');
Query OK, 1 row affected (0.05 sec)

mysql> select *from  myuser;
+----+----------+-----+-----+
| id | username | age | sex |
+----+----------+-----+-----+
|  1 | liyaxi   |  30 |    |
|  2 |       |  30 |    |
+----+----------+-----+-----+
2 rows in set (0.00 sec)
mysql> show  charset; 
//     mysql      。

dos環境で挿入しても読み取りOK!