Realm Transaction Management Example in Android and Java – Realm Database
— Unlike read operations, write operations in Realm must be wrapped in transactions.
— At the end of a write operation, you can either commit the transaction or cancel it.
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Realm realm = Realm.getDefaultInstance(); // Obtain a Realm instance realm.beginTransaction(); // Begin Transaction User user = realm.createObject(User.class); // Create a new object user.setName("Prasanna"); user.setCountry("India"); realm.commitTransaction(); // Commit Transaction OR to discard the changes by cancelling the transaction // realm.cancelTransaction(); // Cancel Transaction |
Transaction Block
Instead of manually keeping track of beginTransaction, commitTransaction, and cancelTransaction, you can use the executeTransaction method, which will automatically handle begin, commit, and cancel if an error happens.
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try (Realm realm = Realm.getDefaultInstance()) { realm.executeTransaction(real -> { User user = realm.createObject(User.class); user.setName("Prasanna"); user.setCountry("India"); }); } |
Asynchronous Transaction
Since transactions are blocked by other transactions, you might want to write on a background thread to avoid blocking the UI thread. By using an asynchronous transaction, Realm will run that transaction on a background thread.
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Realm realm = Realm.getDefaultInstance(); realm.executeTransactionAsync(new Realm.Transaction() { @Override public void execute(Realm real) { User user = real.createObject(User.class); user.setName("Prasanna"); user.setCountry("India"); } }, new Realm.Transaction.OnSuccess() { @Override public void onSuccess() { // Transaction was a success. } }, new Realm.Transaction.OnError() { @Override public void onError(Throwable error) { // Transaction failed and was automatically canceled. } }); |