Why data in my table is not updated?

[phpuser123]

I want to update data from my database using java. I have established my connection successfully and When I am updating the table,the data is not updated in the database.

My SQL is like this ::

UPDATE tbl_Bus SET Bus_locX= 520.0,Bus_locY= 220.0 WHERE Bus_ID=1

This statement does not update my table though it's working fine when I am using it directly in sql editor in MS Access.

My tbl_Bus
Bus_ID,Bus_LocX ,Bus_LocY,Bus_R outeID
and the corresponding data are 1,1,1,1 even after running my app..



My codes

public boolean update_busLoc(double x,double y,int id){
    String query="UPDATE  tbl_Bus SET Bus_locX= "+ x +",Bus_locY="+y + " WHERE Bus_ID="+id;
    System .out.println(query);
    if (DB_connection!=null){
            try{
                     statement.execute(query);
                     return true;

                 }
            catch(SQLException e){
                    e.printStackTrace();
                return false;
            }
    }
    else{
        System.out.println("Connection is not set up");
        return false;
    }

}

I use MS Access 2007
I am able to execute SELECT statements and it is working fine but with update I am having problems..
How do I sort this out?