title: Auto increment primary key in sugar orm
body: <p>How can define an auto increment primary key in Sugar model?
  Do Sugar automatically creates unique ID for each record</p>
  
  <pre><code>import com.orm.SugarRecord;
  
  public class Customers extends SugarRecord {
  
      int id; // this field must be auto increment primary key
      String name;
      String tel;
      String mobile;
      String address;
      String create_date;
  
      public Customers(){}
  
      public Customers(int id, String name, String tel, String mobile, String address, String create_date){
          this.id = id;
          this.name = name;
          this.tel = tel;
          this.mobile = mobile;
          this.address = address;
          this.create_date = create_date;
      }
  }
  </code></pre>