JDBC访问oracle,为什么这样的语句不行:select t.*, '常量字符串' from my_table t?
myy 2005-01-17 08:02:40 JDBC访问oracle,为什么这样的语句不行:select t.*, '常量字符串' from my_table t?
比如:
String qt="select t.id, t.name, '常量字符串' from my_table t";
...
ResultSet rs=dba.ExecQuery(qt);
while (rs.next()) {
System.err.print(rs.getString(1));
System.err.print(rs.getString(2));
System.err.print(rs.getString(3));
}
....
本来应该输出:
1 aaa 常量字符串
2 bbb 常量字符串
3 ccc 常量字符串
可是,第三列却是 ???????????????,这是怎么回事呢?
1 aaa ???????????????
2 bbb ???????????????
3 ccc ???????????????