MySQL Java预准备语句插入（如果不存在）

Question

我正在通过无限for循环运行SQL语句，但找不到仅在数据库中不存在值的情况下仅执行一次的方法。我该如何解决？

if(phoneWeight[0] <= weight && weight <= phoneWeight[1]) {
        phoneOnScale = true;
        System.out.println("Phone is on scale");
        // write one phone to table in db.
        try {
            // create a mysql database connection
            String myDriver = "com.mysql.jdbc.Driver";
            String myUrl = "jdbc:mysql://localhost:3306/smartfridge";
            Class.forName(myDriver);
            Connection conn = DriverManager.getConnection(myUrl, "root", "admin");

            // the mysql insert statement
            String query = " insert into fridge (name, UnitOfSale, ContentsQuantity, department, AverageSellingUnitWeight)"
                    + " values (?, ?, ?, ?, ?)";

            // create the mysql insert preparedstatement
            PreparedStatement preparedStmt = conn.prepareStatement(query);
            preparedStmt.setString(1, "Eggs");
            preparedStmt.setInt(2, 1);
            preparedStmt.setInt(3, 6);
            preparedStmt.setString(4, "Milk, Butter & Eggs");
            preparedStmt.setBoolean(5, phoneOnScale);

            // execute the preparedstatement
            preparedStmt.execute();

        } catch (Exception e) {
            e.printStackTrace();
            //System.out.println("Eggs added to Fridge");
        }
    } else {
        phoneOnScale = false;
    }