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Execute messages in a single database transaction

  • Artikkeli

It is a common requirement in business applications to coordinate changes of multiple table rows in the system so that either all the data changes succeed, or none of them do. In database terms, this is known as executing multiple operations in a single transaction with the ability to roll back all data changes should any one operation fail.

You can execute two or more requests in a single database transaction using the ExecuteTransactionRequest message request. To use this message, populate the Requests collection with two or more organization requests that are to be executed in the transaction. Set ReturnResponses to true if you want to get back a collection of responses, one for each message request executed, in the Responses collection. Message requests in the Requests collection are executed in order as they appear in the collection, where the element at index 0 is executed first. This same order is preserved in the Responses collection.

Should any one of the requests fail and the transaction is rolled back, any data changes completed during the transaction are undone. In addition, a ExecuteTransactionFault is returned identifying the index into the request collection of the request message that caused the fault.

An ExecuteMultipleRequest may contain one or more ExecuteTransactionRequest instances. An ExecuteTransactionRequest instance may not contain a ExecuteMultipleRequest or ExecuteTransactionRequest. For more information on ExecuteMultipleRequest, see Execute multiple requests using the SDK for .NET.

Example

This example uses a single web method call to execute all message requests in a collection as part of a single database transaction. Settings to alter the execution behavior are also shown.

// Create an ExecuteTransactionRequest object.
var requestToCreateRecords = new ExecuteTransactionRequest()
{
// Create an empty organization request collection.
Requests = new OrganizationRequestCollection(),
ReturnResponses = true
};

// Create several (local, in memory) entities in a collection. 
var input = new EntityCollection()
{
EntityName = Account.EntityLogicalName,
Entities = {
            new Account { Name = "ExecuteTransaction Example Account 1" },
            new Account { Name = "ExecuteTransaction Example Account 2" },
            new Account { Name = "ExecuteTransaction Example Account 3" },
            new Account { Name = "ExecuteTransaction Example Account 4" },
            new Account { Name = "ExecuteTransaction Example Account 5" }
        }
};

// Add a CreateRequest for each entity to the request collection.
foreach (var entity in input.Entities)
{
CreateRequest createRequest = new CreateRequest { Target = entity };
requestToCreateRecords.Requests.Add(createRequest);
}

// Execute all the requests in the request collection using a single web method call.
try
{
var responseForCreateRecords =
    (ExecuteTransactionResponse)svc.Execute(requestToCreateRecords);

int i = 0;
// Display the results returned in the responses.
foreach (var responseItem in responseForCreateRecords.Responses)
{
    if (responseItem != null)
    Console.WriteLine("Created " + ((Account)requestToCreateRecords.Requests[i].Parameters["Target"]).Name
        + " with account id as " + responseItem.Results["id"].ToString());
    i++;
}
}
catch (FaultException<OrganizationServiceFault> ex)
{
Console.WriteLine("Create request failed for the account{0} and the reason being: {1}",
    ((ExecuteTransactionFault)(ex.Detail)).FaultedRequestIndex + 1, ex.Detail.Message);
throw;
}

See also

Use messages with the SDK for .NET
Execute multiple requests using the SDK for .NET