Realm-Schleife in einer Transaktion VS eine Transaktion für jede Stepin-Schleife

Question

Welcher Weg ist besser?

1. Eine Transaktion mit einer Schleife in

   public void saveProducts(List<Product> products) { 
   
       Realm realm = Realm.getDefaultInstance(); 
       realm.executeTransaction(realm1 -> { 
   
        for (Product product : products) { 
         Number currentIdNum = realm1.where(Product.class).max("id"); 
         long nextId; 
         if (currentIdNum == null) { 
          nextId = 1; 
         } else { 
          nextId = currentIdNum.longValue() + 1; 
         } 
   
         String code = product.getCategory().getCode(); 
         Category code1 = realm.where(Category.class).equalTo("code", code).findFirst(); 
         if (code1 == null) { 
          Category category = realm.copyToRealmOrUpdate(product.getCategory()); 
          product.setCategory(category); 
         } else { 
          product.setCategory(code1); 
         } 
         product.setId(nextId); 
         realm1.insertOrUpdate(product); // using insert API 
        } 
       }); 
       realm.close(); 
   } 
   

2. Eine Schleife mit Transaktionen für jedes Element?

   public void saveProducts(List<Product> products) { 
   
       Realm realm = Realm.getDefaultInstance(); 
       for (Product product : products) { 
        realm.executeTransaction(realm1 -> { 
         Number currentIdNum = realm1.where(Product.class).max("id"); 
         long nextId; 
         if (currentIdNum == null) { 
          nextId = 1; 
         } else { 
          nextId = currentIdNum.longValue() + 1; 
         } 
   
         String code = product.getCategory().getCode(); 
         Category code1 = realm.where(Category.class).equalTo("code", code).findFirst(); 
         if (code1 == null) { 
          Category category = realm.copyToRealmOrUpdate(product.getCategory()); 
          product.setCategory(category); 
         } else { 
          product.setCategory(code1); 
         } 
         product.setId(nextId); 
         realm1.insertOrUpdate(product); // using insert API 
   
        }); 
       } 
       realm.close(); 
   } 
   

Oder eine andere Art und Weise? Wenn Sie wissen, wie es besser geht, sagen Sie bitte.

Answer 1

Da Sie sich mit Realm-Proxy-Objekten beschäftigen, können Sie diesem Ansatz folgen.

public void saveProducts(List<Product> products) { 

    Realm realm = Realm.getDefaultInstance(); 
     realm.beginTransaction(); 


    for (Product product : products) { 


     Number currentIdNum = realm1.where(Product.class).max("id"); 
     long nextId; 
     if (currentIdNum == null) { 
      nextId = 1; 
     } else { 
      nextId = currentIdNum.longValue() + 1; 
     } 

     String code = product.getCategory().getCode(); 
     Category code1 = realm.where(Category.class).equalTo("code", code).findFirst(); 
     if (code1 == null) { 
      Category category = realm.copyToRealmOrUpdate(product.getCategory()); 
      product.setCategory(category); 
     } else { 
      product.setCategory(code1); 
     } 
     product.setId(nextId); 
     realm.insertOrUpdate(product); // using insert API 



    } 
    realm.commitTransaction(); 

    realm.close(); 
} 

Answer 2

for (Product product : products) { 
    realm.executeTransaction(realm1 -> 

Dieser ist viel schlimmer.

Einzeltransaktionen bevorzugen.