can't get the category ID ( java/sql )

Question

I have 2 tables: salon_stock categories

the salon_stock table has a fk column cat_id of categories table

Categories table have 2 columns cat_id & title

In the below code i am trying to insert the cat_id which belong to a category name retrieved from a JComboBox along with the data of salon_stock table

    private void AddStock() throws SQLException,NullPointerException {


int catID = 0; 

String cat=cat_list.getSelectedItem().toString();

            if (cat.equals("Select a Category")) {
                 ResultSet rs = con.createStatement().executeQuery("select * from categories where title=' Default'");

            if(rs.next()){
                catID=rs.getInt("cat_id");
            }
            else{
                throw new SQLException("The 'Default' category was not found in the Categories Table");
            }

            }
            else{
          ResultSet rs = con.createStatement().executeQuery("select * from categories where title=' "+cat+"'");

            if(rs.next()){
               catID=rs.getInt("cat_id");
               }
            }

          ps1 = con.prepareStatement("insert into "+tableName+"(title,price,qty,cat_id) values( ?,?,?,?)");

          ps1.setString(1,title_field.getText());
          ps1.setInt(2,Integer.parseInt(price_field.getText()));
          ps1.setInt(3,Integer.parseInt(qty_field.getText()));
          ps1.setInt(4,catID);
          ps1.executeUpdate();
          ps1.closeOnCompletion();

    }

the code runs fine but in the table, it inserts the '0' value to the cat_id column of stock_table.

i am unable to detect the error.. please help me..

Answer 1

maybe the space in the query is the error:

"select * from categories where title=' "+cat+"'"

must be

"select * from categories where title='"+cat+"'"