set value = 0 while updating record in jsp

im trying to update a column using jsp
here i want my count column value to be updated as zero
count = 0
how can i do that. through this code value is not updating

   String code = request.getParameter("code");
   Connection conn = null;
   Statement st=null;
   ResultSet rs = null;
   PreparedStatement ps = null;
   int count = 0;

   try{
     conn = DataBaseConnection.initializeDatabase();
     


    String query1 = null;
     conn.setAutoCommit(false);
     query1 = "update employee set count = ? where code= ' +code+' ";
     	ps = conn.prepareStatement(query1);
     	ps.setInt(1, count);
        ps.executeUpdate();
        }
        catch (Exception e) {
        e.printStackTrace();
        }

here is my record in db
employee table
CODE VARCHAR2(12)
COUNT NUMBER(3)

You can replace

"update employee set count = ? where code= ' +code+' ";

with

"update employee set count = ? where code= '" + code + "'";

e.g. if the value of code is xyz then after this change, the query will become:

"update employee set count = ? where code= 'xyz'";

However, I recommend you do it as follows to avoid the SQL Injection:

query1 = "update employee set count = ? where code= ?";
ps = conn.prepareStatement(query1);
ps.setInt(1, count);
ps.setString(2, code);