JDBC PreparedStatement with Oracle 8.0.5 on Linux

Question

As the subject stated, I am using Oracle 8.0.5 on a Linux machine.
When I am using a PreparedStatement, somehow, the binded variables are reversed in order.
E.g.
String sql = "INSERT INTO TABLE1 (X, Y) VALUES (?, ?)";
PreparedStatement ps = conn.prepareStatement(sql);
ps.setString(1, "1");
ps.setString(2, "2");
ps.executeUpdate();
When I run the above, the insertion is successful. However, when I select the table, this is what I get.
X Y
2 1
The values are reversed.
This is the same for update statement too.
If I do this,
"UPDATE TABLE1 SET X = ? WHERE Y = ?"
ps.setString (1, "3");
ps.setString (2, "1");
The above will not be successful.
If I do this,
ps.setString (2, "3");
ps.setString (1, "1");
The above is successful.
Somehow the order of the binded variable get messed up.
Does anyone has any idea why?

Answer 1

The datatype of X and Y are both VARCHAR2(10) in this case.
Even if they are numbers, they have the same problem. The order get reversed and the data inserted is incorrect.
E.g. I have column M VARCHAR2(10) and column N NUMBER (2) in TABLE2.
String sql = "INSERT INTO TABLE2 (M, N) VALUES (?, ?)";
PreparedStatement ps = conn.prepareStatement(sql);
ps.setString(1, "one");
ps.setInt(2, 1);
ps.executeUpdate();
The insert operation is still successful. But when you select it becomes,
M N
? 0
This is because the order of the variables get reversed again.
Forgot to mention that if we have used Statement instead of PreparedStatement, we will not have such problem.
E.g. Statement stmt = conn.createStatement();
String sql = "INSERT INTO TABLE2 (M, N) VALUES ('one', 1)";
stmt.executeUpdate(stmt);
The above will insert fine and when we do a select, the result is correct.
M N
one 1
Though the above works fine, I still prefer to use PreparedStatement because of performance issue. So anyone has any idea what exactly is happening?
Hmmm, this ones a strange one.
What type are X and Y in the database? If they are of
type NUMBER why not try something like.
ps.setInt(1, 1);
OR
ps.setLong(2, 2);
and see if that makes any difference.