private CurrentPrice getCurrentPrice(int id)
{
CurrentPrice currentPriceObject = new CurrentPrice();
DatastoreDb db = DatastoreDb.Create(projectId, "ProductNamespace", datastoreClient);
KeyFactory keyFactory = db.CreateKeyFactory(kind);
string name = id + "";
Key key = keyFactory.CreateKey(name);
using (DatastoreTransaction transaction = db.BeginTransaction())
{
Entity currentProduct = transaction.Lookup(key);
transaction.Commit();
Value price, currency_code;
if (currentProduct.Properties.TryGetValue("price", out price))
{
currentPriceObject.value = price.DoubleValue;
}
if (currentProduct.Properties.TryGetValue("currency_code", out currency_code))
{
currentPriceObject.currency_code = currency_code.StringValue;
}
}
return(currentPriceObject);
}
public void DeleteEntity()
{
string projectId = _fixture.ProjectId;
string namespaceId = _fixture.NamespaceId;
// Copied from InsertEntity; we want to create a new one to delete.
DatastoreDb insertClient = DatastoreDb.Create(projectId, namespaceId);
KeyFactory keyFactory = insertClient.CreateKeyFactory("Task");
Entity entity = new Entity
{
Key = keyFactory.CreateIncompleteKey(),
["category"] = "Personal",
["done"] = false,
["priority"] = 4,
["description"] = "Learn Cloud Datastore",
["percent_complete"] = 75.0
};
Key insertedKey = insertClient.Insert(entity);
// Sample: DeleteEntity
DatastoreDb db = DatastoreDb.Create(projectId, namespaceId);
// If you have an entity instead of just a key, then entity.ToDelete() would work too.
db.Delete(insertedKey);
// End sample
}
public void PaginateWithCursor()
{
string projectId = _fixture.ProjectId;
string namespaceId = _fixture.NamespaceId;
ByteString pageCursor = null;
int pageSize = 5;
// Sample: PaginateWithCursor
Query query = new Query("Task")
{
Limit = pageSize, StartCursor = pageCursor ?? ByteString.Empty
};
DatastoreDb db = DatastoreDb.Create(projectId, namespaceId);
DatastoreQueryResults results = db.RunQueryLazily(query, ReadConsistency.Eventual).GetAllResults();
foreach (Entity entity in results.Entities)
{
// Do something with the task entity
}
if (results.MoreResults == MoreResultsType.MoreResultsAfterLimit)
{
ByteString nextPageCursor = results.EndCursor;
// Store nextPageCursor to get the next page later.
}
// End sample
}
public async Task EagerGqlQueryAsync()
{
string projectId = _fixture.ProjectId;
string namespaceId = _fixture.NamespaceId;
// Snippet: RunQueryAsync(GqlQuery,*,*)
DatastoreDb db = DatastoreDb.Create(projectId, namespaceId);
GqlQuery gqlQuery = new GqlQuery
{
QueryString = "SELECT * FROM book WHERE author = @author",
NamedBindings = { { "author", new GqlQueryParameter {
Value = "Jane Austen"
} } },
};
DatastoreQueryResults results = await db.RunQueryAsync(gqlQuery);
// RunQuery fetches all the results into memory in a single call.
// Constrast this with RunQueryLazily, which merely prepares an enumerable
// query. Always specify a limit when you use RunQuery, to avoid running
// out of memory.
foreach (Entity entity in results.Entities)
{
Console.WriteLine(entity);
}
// End snippet
// This will run the query again, admittedly...
Assert.Equal(1, results.Entities.Count);
Entity book = results.Entities[0];
Assert.Equal("Jane Austen", (string)book["author"]);
Assert.Equal("Pride and Prejudice", (string)book["title"]);
}
public async Task AddEntity_NonTransactional_Async()
{
string projectId = _fixture.ProjectId;
string namespaceId = _fixture.NamespaceId;
// Snippet: InsertAsync(*)
DatastoreDb db = DatastoreDb.Create(projectId, namespaceId);
KeyFactory keyFactory = db.CreateKeyFactory("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" }
};
IReadOnlyList <Key> insertedKeys = await db.InsertAsync(book1, book2);
Console.WriteLine($"Inserted keys: {string.Join(",", insertedKeys)}");
// End snippet
}
private async Task CommitTest(Func <DatastoreTransaction, Task <CommitResponse> > commitCall)
{
var db = DatastoreDb.Create(_fixture.ProjectId, _fixture.NamespaceId);
var keyFactory = db.CreateKeyFactory("book");
var updatedEntity = new Entity {
Key = keyFactory.CreateIncompleteKey(), ["description"] = "Inserted before transaction"
};
db.Insert(updatedEntity);
Entity insertedEntity = new Entity {
Key = keyFactory.CreateIncompleteKey(), ["description"] = "Inserted in transaction"
};
Entity upsertedEntity = new Entity {
Key = keyFactory.CreateIncompleteKey(), ["description"] = "Upserted in transaction"
};
using (var transaction = db.BeginTransaction())
{
transaction.Insert(insertedEntity);
transaction.Upsert(upsertedEntity);
updatedEntity["description"] = "Updated in transaction";
transaction.Update(updatedEntity);
await commitCall(transaction);
}
// Check we can fetch with the newly allocated keys
var entities = db.Lookup(insertedEntity.Key, upsertedEntity.Key, updatedEntity.Key);
var descriptions = entities.Select(e => (string)e["description"]);
Assert.Equal(new[] { "Inserted in transaction", "Upserted in transaction", "Updated in transaction" }, descriptions);
}
public async Task LazyGqlQueryAsync()
{
string projectId = _fixture.ProjectId;
string namespaceId = _fixture.NamespaceId;
// Snippet: RunQueryLazilyAsync(GqlQuery,*,*)
DatastoreDb db = DatastoreDb.Create(projectId, namespaceId);
GqlQuery gqlQuery = new GqlQuery
{
QueryString = "SELECT * FROM book WHERE author = @author",
NamedBindings = { { "author", new GqlQueryParameter {
Value = "Jane Austen"
} } },
};
AsyncLazyDatastoreQuery results = db.RunQueryLazilyAsync(gqlQuery);
// AsyncLazyDatastoreQuery implements IAsyncEnumerable<Entity>, but you can
// call AsResponses() to see the raw RPC responses, or
// GetAllResultsAsync() to get all the results into memory, complete with
// the end cursor and the reason for the query finishing.
await results.ForEachAsync(entity =>
{
Console.WriteLine(entity);
});
// End snippet
// This will run the query again, admittedly...
List <Entity> entities = await results.ToList();
Assert.Equal(1, entities.Count);
Entity book = entities[0];
Assert.Equal("Jane Austen", (string)book["author"]);
Assert.Equal("Pride and Prejudice", (string)book["title"]);
}
public async Task AsyncQueries()
{
var db = DatastoreDb.Create(_fixture.ProjectId, _fixture.NamespaceId);
var keyFactory = db.CreateKeyFactory("asyncqueries");
using (var transaction = await db.BeginTransactionAsync())
{
var entities = Enumerable.Range(0, 5)
.Select(x => new Entity {
Key = keyFactory.CreateIncompleteKey(), ["x"] = x
})
.ToList();
transaction.Insert(entities);
await transaction.CommitAsync();
}
var query = new Query("asyncqueries")
{
Filter = Filter.LessThan("x", 3)
};
var gql = new GqlQuery {
QueryString = "SELECT * FROM asyncqueries WHERE x < 3", AllowLiterals = true
};
ValidateQueryResults((await db.RunQueryAsync(gql)).Entities);
ValidateQueryResults((await db.RunQueryAsync(query)).Entities);
ValidateQueryResults(db.RunQueryLazilyAsync(query).ToEnumerable());
ValidateQueryResults(db.RunQueryLazilyAsync(gql).ToEnumerable());
}
public async Task InsertAsync_ResultKeys()
{
var db = DatastoreDb.Create(_fixture.ProjectId, _fixture.NamespaceId);
var keyFactory = db.CreateKeyFactory("insertasync_test");
var entities = new[]
{
new Entity {
Key = keyFactory.CreateKey("x"), ["description"] = "predefined_key"
},
new Entity {
Key = keyFactory.CreateIncompleteKey(), ["description"] = "incomplete_key"
}
};
var keys = await db.InsertAsync(entities);
Assert.Null(keys[0]); // Insert with predefined key
Assert.NotNull(keys[1]); // Insert with incomplete key
// Inserted key is propagated into entity
Assert.Equal(keys[1], entities[1].Key);
var fetchedEntity = await db.LookupAsync(keys[1]);
Assert.Equal("incomplete_key", fetchedEntity["description"]);
}
public DatastoreDbProvider(IConfigurationService configurationService, IDataEntityObjectFactory dataEntityObjectFactory)
{
var project = configurationService.Get("DATASTOREDB_PROJECT");
_db = DatastoreDb.Create(project);
_dataEntityObjectFactory = dataEntityObjectFactory;
}
public static void Main(string[] args)
{
// Your Google Cloud Platform project ID
string projectId = "YOUR-PROJECT-ID";
// Instantiates a client
DatastoreDb db = DatastoreDb.Create(projectId);
// The kind for the new entity
string kind = "Task";
// The name/ID for the new entity
string name = "sampletask1";
KeyFactory keyFactory = db.CreateKeyFactory(kind);
// The Cloud Datastore key for the new entity
Key key = keyFactory.CreateKey(name);
var task = new Entity
{
Key = key,
["description"] = "Buy milk"
};
using (DatastoreTransaction transaction = db.BeginTransaction())
{
// Saves the task
transaction.Upsert(task);
transaction.Commit();
Console.WriteLine($"Saved {task.Key.Path[0].Name}: {(string)task["description"]}");
}
}
protected override void ProcessRecord()
{
base.ProcessRecord();
var db = DatastoreDb.Create(Project);
using (var transaction = db.BeginTransaction())
{
switch (Action)
{
case "Insert":
returnKey = db.Insert(Entity);
break;
case "Update":
db.Update(Entity);
break;
case "Upsert":
returnKey = db.Upsert(Entity);
break;
default:
var e = new ArgumentException();
var er = new ErrorRecord(e, "UnknownAction", ErrorCategory.InvalidArgument, Action);
ThrowTerminatingError(er);
break;
}
WriteObject(returnKey);
}
}
public void TimestampFromProjection()
{
var db = DatastoreDb.Create(_fixture.ProjectId, _fixture.NamespaceId);
string kind = "projection_test";
var keyFactory = db.CreateKeyFactory(kind);
DateTime sampleTimestamp = new DateTime(2018, 12, 3, 15, 8, 32, 123, DateTimeKind.Utc);
using (var transaction = db.BeginTransaction())
{
transaction.Insert(new Entity {
Key = keyFactory.CreateIncompleteKey(), ["ts"] = sampleTimestamp, ["ignore"] = "ignore me"
});
transaction.Commit();
}
var query = new Query(kind)
{
Projection = { "ts" }
};
var results = db.RunQuery(query).Entities;
Assert.Equal(1, results.Count);
Assert.Equal(sampleTimestamp, results[0]["ts"].ToDateTimeFromProjection());
Assert.Equal((DateTimeOffset)sampleTimestamp, results[0]["ts"].ToDateTimeOffsetFromProjection());
}
public ActionResult Index()
{
var dbStore = DatastoreDb.Create("programming-for-the-cloud"); //getting an instance of the database
Query q = new Query("Username");
var resultOfQuery = dbStore.RunQuery(q);
List <UserLog> userlogs = new List <UserLog>();
foreach (var user in resultOfQuery.Entities)
{
UserLog log = new UserLog()
{
Id = user.Key.Path.First().Id,
Key = user.Key.ToString(),
Email = user["email"].StringValue,
LoggedOn = user["loggedOn"].TimestampValue.ToDateTime(),
};
try
{
log.LoggedOut = user["loggedOut"].IsNull ? (DateTime?)null : user["loggedOut"].TimestampValue.ToDateTime();
}
catch
{
}
userlogs.Add(log);
}
return(View(userlogs));
}
public void Lookup()
{
string projectId = _fixture.ProjectId;
string namespaceId = _fixture.NamespaceId;
// Snippet: Lookup(Key[])
DatastoreDb db = DatastoreDb.Create(projectId, namespaceId);
KeyFactory keyFactory = db.CreateKeyFactory("message");
Entity message = new Entity {
Key = keyFactory.CreateIncompleteKey(), ["text"] = "Original"
};
db.Insert(message);
using (DatastoreTransaction transaction = db.BeginTransaction())
{
// Look the message up at the start of the transaction
Entity fetched1 = transaction.Lookup(message.Key);
Console.WriteLine((string)fetched1["text"]); // "Original"
// Update the message outside the transaction
message["text"] = "Updated";
db.Update(message);
// Look up the message up again. We are guaranteed not to see the
// update because it occurred after the start of the transaction.
Entity fetched2 = transaction.Lookup(message.Key);
Console.WriteLine((string)fetched2["text"]); // Still "Original"
}
// End snippet
}
public void Query_ImplicitlyUsesPartition()
{
var db = DatastoreDb.Create(_fixture.ProjectId, _fixture.NamespaceId);
var keyFactory = db.CreateKeyFactory("parent");
var parent = new Entity
{
Key = keyFactory.CreateIncompleteKey()
};
var parentKey = db.Insert(parent);
var child = new Entity
{
Key = parentKey.WithElement(new PathElement {
Kind = "child"
}),
};
db.Insert(child);
using (var transaction = db.BeginTransaction())
{
var query = new Query("child")
{
Filter = Filter.HasAncestor(parentKey)
};
var results = transaction.RunQueryLazily(query);
Assert.Equal(1, results.Count());
}
}
static void CreateMovies()
{
//Project Id from the Project at GCP
string projectId = "<your-project-id>";
//We are storing movies. So this is a Movie kind.
string kind = "Movie";
//Create the datastore db
var db = DatastoreDb.Create(projectId);
//List of movies
List <Entity> movieEntities = new List <Entity>();
//I need 10 movies
for (int i = 1; i <= 10; i++)
{
movieEntities.Add(
new Entity
{
Key = db.CreateKeyFactory(kind).CreateKey($"key{i}"),
["title"] = $"Movie Title {i}",
["releasedYear"] = 2018,
["director"] = $"Director {i}"
}
);
}
//Lets send the movies to the datastore
using (var transction = db.BeginTransaction())
{
transction.Upsert(movieEntities);
transction.Commit();
}
}
public GcpDataStoreFixture()
{
var builder = new ConfigurationBuilder()
.AddJsonFile("appsettings.json", optional: true, reloadOnChange: true)
.AddEnvironmentVariables();
var config = builder.Build();
var services = new ServiceCollection();
services.AddGcpDatastore();
services.AddSingleton <IConfiguration>(config);
var toRemove = services.Single(s => s.ServiceType == typeof(DataStoreKind));
services.Remove(toRemove);
services.AddSingleton(new DataStoreKind(Kind));
var sp = services.BuildServiceProvider();
var gcpConfig = sp.GetRequiredService <IOptions <GcpDatastoreConfig> >().Value;
Db = DatastoreDb.Create(gcpConfig.ProjectId);
KeyFactory = Db.CreateKeyFactory(Kind);
MqttIntentStore = (GcpDatastoreMqttIntentStore)sp.GetRequiredService <IMqttIntentStore>();
}
private async Task AsyncQueries_ImplicityUsePartition()
{
var db = DatastoreDb.Create(_fixture.ProjectId, _fixture.NamespaceId);
var parentKey = PrepareQueryTest(db);
using (var transaction = db.BeginTransaction())
{
var query = new Query("childKind")
{
Filter = Filter.HasAncestor(parentKey)
};
var gql = new GqlQuery
{
QueryString = "SELECT * FROM childKind WHERE __key__ HAS ANCESTOR @1",
PositionalBindings = { new GqlQueryParameter {
Value = parentKey
} }
};
var lazyResults = transaction.RunQueryLazilyAsync(query);
Assert.Equal(1, await lazyResults.Count());
lazyResults = transaction.RunQueryLazilyAsync(gql);
Assert.Equal(1, await lazyResults.Count());
var eagerResults = await transaction.RunQueryAsync(query);
Assert.Equal(1, eagerResults.Entities.Count);
eagerResults = await transaction.RunQueryAsync(gql);
Assert.Equal(1, eagerResults.Entities.Count);
}
}
public DataService(GcpConfiguration config)
{
_db = DatastoreDb.Create(config.ProjectId);
_storage = StorageClient.Create();
_keyFactory = _db.CreateKeyFactory(Kind);
_bucketName = config.BucketName;
}
public async Task EagerStructuredQueryAsync()
{
string projectId = _fixture.ProjectId;
string namespaceId = _fixture.NamespaceId;
// Snippet: RunQueryAsync(Query,*,*)
DatastoreDb db = DatastoreDb.Create(projectId, namespaceId);
Query query = new Query("book")
{
Filter = Filter.Equal("author", "Jane Austen")
};
DatastoreQueryResults results = await db.RunQueryAsync(query);
// RunQuery fetches all the results into memory in a single call.
// Constrast this with RunQueryLazily, which merely prepares an enumerable
// query. Always specify a limit when you use RunQuery, to avoid running
// out of memory.
foreach (Entity entity in results.Entities)
{
Console.WriteLine(entity);
}
// End snippet
// This will run the query again, admittedly...
Assert.Equal(1, results.Entities.Count);
Entity book = results.Entities[0];
Assert.Equal("Jane Austen", (string)book["author"]);
Assert.Equal("Pride and Prejudice", (string)book["title"]);
}
public void Upsert_ResultKeys()
{
var db = DatastoreDb.Create(_fixture.ProjectId, _fixture.NamespaceId);
var keyFactory = db.CreateKeyFactory("upsert_test");
var insertedKey = db.Insert(new Entity {
Key = keyFactory.CreateIncompleteKey(), ["description"] = "original"
});
var revisedEntity = new Entity {
Key = insertedKey, ["description"] = "changed"
};
var newEntity1 = new Entity {
Key = keyFactory.CreateKey("x"), ["description"] = "predefined_key"
};
var newEntity2 = new Entity {
Key = keyFactory.CreateIncompleteKey(), ["description"] = "incomplete_key"
};
var keys = db.Upsert(revisedEntity, newEntity1, newEntity2);
Assert.Null(keys[0]); // Update
Assert.Null(keys[1]); // Insert with predefined key
Assert.NotNull(keys[2]); // Insert with incomplete key
var fetchedEntity = db.Lookup(keys[2]);
Assert.Equal("incomplete_key", fetchedEntity["description"]);
}
public void AddEntity_Transactional()
{
string projectId = _fixture.ProjectId;
string namespaceId = _fixture.NamespaceId;
// Sample: AddEntity
DatastoreDb db = DatastoreDb.Create(projectId, namespaceId);
KeyFactory keyFactory = db.CreateKeyFactory("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" }
};
using (DatastoreTransaction transaction = db.BeginTransaction())
{
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
}
public void Lookup_NoPartition()
{
// Deliberately in the empty namespace, which won't be cleaned up automatically - hence the db.Delete call later.
var db = DatastoreDb.Create(_fixture.ProjectId);
var keyFactory = db.CreateKeyFactory("test");
var entity = new Entity
{
Key = keyFactory.CreateIncompleteKey(),
["foo"] = "bar"
};
var insertedKey = db.Insert(entity);
try
{
var lookupKey = new Key {
Path = { insertedKey.Path }
};
var result = db.Lookup(lookupKey);
Assert.NotNull(result);
Assert.Equal("bar", (string)entity["foo"]);
}
finally
{
db.Delete(insertedKey);
}
}
public void InsertOverview()
{
string projectId = _fixture.ProjectId;
string namespaceId = _fixture.NamespaceId;
// Sample: InsertOverview
DatastoreDb db = DatastoreDb.Create(projectId, namespaceId);
KeyFactory keyFactory = db.CreateKeyFactory("message");
Entity entity = new Entity
{
Key = keyFactory.CreateIncompleteKey(),
["created"] = DateTime.UtcNow,
["text"] = "Text of the message",
["tags"] = new[] { "tag1", "tag2" }
};
using (DatastoreTransaction transaction = db.BeginTransaction())
{
transaction.Insert(entity);
CommitResponse commitResponse = transaction.Commit();
Key insertedKey = commitResponse.MutationResults[0].Key;
Console.WriteLine($"Inserted key: {insertedKey}");
// The key is also propagated to the entity
Console.WriteLine($"Entity key: {entity.Key}");
}
// End sample
}
public void EagerGqlQuery()
{
string projectId = _fixture.ProjectId;
string namespaceId = _fixture.NamespaceId;
// Snippet: RunQuery(GqlQuery,*)
DatastoreDb db = DatastoreDb.Create(projectId, namespaceId);
KeyFactory keyFactory = db.CreateKeyFactory("player");
// Prepare the data: a player with two game child entities
Entity player = new Entity
{
Key = keyFactory.CreateIncompleteKey(),
["name"] = "Sophie"
};
Key playerKey = db.Insert(player);
Entity game1 = new Entity
{
Key = playerKey.WithElement(new PathElement {
Kind = "game"
}),
["score"] = 10,
["timestamp"] = new DateTime(2017, 2, 16, 8, 35, 0, DateTimeKind.Utc)
};
Entity game2 = new Entity
{
Key = playerKey.WithElement(new PathElement {
Kind = "game"
}),
["score"] = 25,
["timestamp"] = new DateTime(2017, 3, 15, 10, 35, 0, DateTimeKind.Utc)
};
db.Insert(game1, game2);
// Perform a query within a transaction
using (DatastoreTransaction transaction = db.BeginTransaction())
{
// Any query executed in a transaction must at least have an ancestor filter.
GqlQuery query = new GqlQuery
{
QueryString = "SELECT * FROM game WHERE __key__ HAS ANCESTOR @player LIMIT @limit",
NamedBindings =
{
{ "player", playerKey },
{ "limit", 10 }
}
};
DatastoreQueryResults results = db.RunQuery(query);
// RunQuery fetches all the results into memory in a single call.
// Constrast this with RunQueryLazily, which merely prepares an enumerable
// query. Always specify a limit when you use RunQuery, to avoid running
// out of memory.
foreach (Entity entity in results.Entities)
{
Console.WriteLine(entity);
}
}
// End snippet
}
public void LazyStructuredQuery()
{
string projectId = _fixture.ProjectId;
string namespaceId = _fixture.NamespaceId;
// Snippet: RunQueryLazily(Query,*,*)
DatastoreDb db = DatastoreDb.Create(projectId, namespaceId);
Query query = new Query("book")
{
Filter = Filter.Equal("author", "Jane Austen")
};
LazyDatastoreQuery results = db.RunQueryLazily(query);
// LazyDatastoreQuery implements IEnumerable<Entity>, but you can
// call AsResponses() to see the raw RPC responses, or
// GetAllResults() to get all the results into memory, complete with
// the end cursor and the reason for the query finishing.
foreach (Entity entity in results)
{
Console.WriteLine(entity);
}
// End snippet
// This will run the query again, admittedly...
List <Entity> entities = results.ToList();
Assert.Equal(1, entities.Count);
Entity book = entities[0];
Assert.Equal("Jane Austen", (string)book["author"]);
Assert.Equal("Pride and Prejudice", (string)book["title"]);
}
public void Commit()
{
string projectId = _fixture.ProjectId;
string namespaceId = _fixture.NamespaceId;
// Snippet: Commit
// Additional: Insert(Entity[])
DatastoreDb db = DatastoreDb.Create(projectId, namespaceId);
KeyFactory keyFactory = db.CreateKeyFactory("message");
using (DatastoreTransaction transaction = db.BeginTransaction())
{
Entity entity = new Entity
{
Key = keyFactory.CreateIncompleteKey(),
["message"] = "Hello"
};
// This adds the entity to a collection in memory: nothing
// is sent to the server.
transaction.Insert(entity);
// Without the Commit call, the transaction will automatically
// be rolled back. The Commit call performs all the mutations
// within the transaction.
transaction.Commit();
}
// End snippet
}
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
DatastoreDb db = DatastoreDb.Create(projectId, namespaceId);
using (DatastoreTransaction transaction = db.BeginTransaction())
{
// 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 GroceryListController()
{
System.Environment.SetEnvironmentVariable("GOOGLE_APPLICATION_CREDENTIALS", "E:\\Downloads\\My Project-5b01a7686bd6.json");
projectId = "cellular-datum-186719";
_db = DatastoreDb.Create(projectId);
_keyFactory = _db.CreateKeyFactory("GroceryList");
}
