public void TransactionReadAndWrite()
{
string projectId = _fixture.ProjectId;
string namespaceId = _fixture.NamespaceId;
long amount = 1000L;
Key fromKey = CreateAccount("Jill", 20000L);
Key toKey = CreateAccount("Beth", 15500L);
// Sample: TransactionReadAndWrite
DatastoreClient client = DatastoreClient.Create();
ByteString transactionId = client.BeginTransaction(projectId).Transaction;
using (DatastoreTransaction transaction = DatastoreTransaction.Create(client, projectId, namespaceId, transactionId))
{
// The return value from DatastoreTransaction.Get contains the fetched entities
// in the same order as they are in the call.
IReadOnlyList <Entity> entities = transaction.Lookup(fromKey, toKey);
Entity from = entities[0];
Entity to = entities[1];
from["balance"] = (long)from["balance"] - amount;
to["balance"] = (long)to["balance"] - amount;
transaction.Update(from);
transaction.Update(to);
transaction.Commit();
}
// End sample
}
public void Overview()
{
string projectId = _fixture.ProjectId;
string namespaceId = _fixture.NamespaceId;
// Sample: Overview
DatastoreClient client = DatastoreClient.Create();
KeyFactory keyFactory = new KeyFactory(projectId, namespaceId, "message");
Entity entity = new Entity
{
Key = keyFactory.CreateIncompleteKey(),
["created"] = DateTime.UtcNow,
["text"] = "Text of the message",
["tags"] = new[] { "tag1", "tag2" }
};
ByteString transactionId = client.BeginTransaction(projectId).Transaction;
using (DatastoreTransaction transaction = DatastoreTransaction.Create(client, projectId, namespaceId, transactionId))
{
transaction.Insert(entity);
CommitResponse commitResponse = transaction.Commit();
Key insertedKey = commitResponse.MutationResults[0].Key;
Console.WriteLine($"Inserted key: {insertedKey}");
}
// End sample
}
public void BeginTransaction()
{
// Snippet: BeginTransaction(string,CallSettings)
// Create client
DatastoreClient datastoreClient = DatastoreClient.Create();
// Initialize request argument(s)
string projectId = "";
// Make the request
BeginTransactionResponse response = datastoreClient.BeginTransaction(projectId);
// End snippet
}
public void BeginTransaction_RequestObject()
{
// Snippet: BeginTransaction(BeginTransactionRequest,CallSettings)
// Create client
DatastoreClient datastoreClient = DatastoreClient.Create();
// Initialize request argument(s)
BeginTransactionRequest request = new BeginTransactionRequest
{
ProjectId = "",
};
// Make the request
BeginTransactionResponse response = datastoreClient.BeginTransaction(request);
// End snippet
}
public void UpdateEntity()
{
string projectId = _fixture.ProjectId;
string namespaceId = _fixture.NamespaceId;
Key key = _fixture.LearnDatastoreKey;
// Sample: UpdateEntity
DatastoreClient client = DatastoreClient.Create();
ByteString transactionId = client.BeginTransaction(projectId).Transaction;
using (DatastoreTransaction transaction = DatastoreTransaction.Create(client, projectId, namespaceId, transactionId))
{
Entity entity = transaction.Lookup(key);
entity["priority"] = 5;
transaction.Update(entity);
transaction.Commit();
}
// End sample
}
public void AddEntity()
{
string projectId = _fixture.ProjectId;
string namespaceId = _fixture.NamespaceId;
// Sample: AddEntity
DatastoreClient client = DatastoreClient.Create();
KeyFactory keyFactory = new KeyFactory(projectId, namespaceId, "book");
Entity book1 = new Entity
{
Key = keyFactory.CreateIncompleteKey(),
["author"] = "Harper Lee",
["title"] = "To Kill a Mockingbird",
["publication_date"] = new DateTime(1960, 7, 11, 0, 0, 0, DateTimeKind.Utc),
["genres"] = new[] { "Southern drama", "Courtroom drama", "Bildungsroman" }
};
Entity book2 = new Entity
{
Key = keyFactory.CreateIncompleteKey(),
["author"] = "Charlotte Brontë",
["title"] = "Jane Eyre",
["publication_date"] = new DateTime(1847, 10, 16, 0, 0, 0, DateTimeKind.Utc),
["genres"] = new[] { "Gothic", "Romance", "Bildungsroman" }
};
ByteString transactionId = client.BeginTransaction(projectId).Transaction;
using (DatastoreTransaction transaction = DatastoreTransaction.Create(client, projectId, namespaceId, transactionId))
{
transaction.Insert(book1, book2);
CommitResponse response = transaction.Commit();
IEnumerable <Key> insertedKeys = response.MutationResults.Select(r => r.Key);
Console.WriteLine($"Inserted keys: {string.Join(",", insertedKeys)}");
}
// End sample
}