// shows alternative ways of generating DataServiceContext objects
internal static void RunSamples2()
{
StorageAccountInfo account = null;
try
{
account = StorageAccountInfo.GetDefaultTableStorageAccountFromConfiguration();
TableStorage tableStorage = TableStorage.Create(account);
tableStorage.RetryPolicy = RetryPolicies.RetryN(3, TimeSpan.FromSeconds(1));
// the DataServiceContext object inherits its retry policy from tableStorage in this case
TableStorageDataServiceContext svc = tableStorage.GetDataServiceContext();
Console.WriteLine("Table creation, delete and list samples...");
string sampleTableName = SampleDataServiceContext.SampleTableName;
tableStorage.TryCreateTable(sampleTableName);
DeleteAllEntriesFromSampleTable(svc, sampleTableName);
Console.WriteLine("List all tables in the account.");
IEnumerable <string> tables2 = tableStorage.ListTables();
foreach (string n1 in tables2)
{
Console.WriteLine(n1);
}
Console.WriteLine("Inserting entities into the table...");
SampleEntity t = new SampleEntity("samplepartitionkey", "samplerowkey");
svc.AddObject(sampleTableName, t);
svc.SaveChangesWithRetries();
//Detach the existing entity so that we can demonstrate the server side
//error when you try to insert an same object with the same keys
svc.Detach(t);
// Insert an entity with the same keys
Console.WriteLine("Try to insert the same entity into the table and show how to deal with error conditions.");
t = new SampleEntity("samplepartitionkey", "samplerowkey");
svc.AddObject(sampleTableName, t);
try
{
svc.SaveChangesWithRetries();
// getting here is an error because inserting the same row twice raises an exception
Console.WriteLine("Should not get here. Succeeded inserting two entities with the same keys");
}
catch (Exception e)
{
HttpStatusCode status;
StorageExtendedErrorInformation errorInfo;
if (TableStorageHelpers.EvaluateException(e, out status, out errorInfo) &&
status == HttpStatusCode.Conflict)
{
// the row has already been inserted before, this is expected here
if (errorInfo != null)
{
Console.WriteLine("Attempting to insert row with same keys resulted in error {0} : {1}",
errorInfo.ErrorCode, errorInfo.ErrorMessage);
}
}
else
{
throw;
}
}
svc.Detach(t);
Console.WriteLine("Insert a large item into the table.");
t = new SampleEntity("samplepartitionkey", "samplerowkey1");
t.B = new String('a', 1000);
svc.AddObject(sampleTableName, t);
svc.SaveChangesWithRetries();
Console.WriteLine("Create a normal DataServiceContext object (not TableStorageDataServiceContext) and attach it to a TableStorage object.");
DataServiceContext svc2 = new DataServiceContext(
TableStorage.GetServiceBaseUri(account.BaseUri, account.UsePathStyleUris, account.AccountName));
tableStorage.Attach(svc2);
var qResult = from c in svc2.CreateQuery <SampleEntity>(sampleTableName)
where c.RowKey == "samplerowkey1"
select c;
foreach (SampleEntity cust in qResult)
{
if (cust.B != t.B)
{
Console.WriteLine("Sample failed. Did not read the entity property just written");
}
}
Console.WriteLine("Insert many rows in a table and show the API for dealing with query result pagination.");
int num = 2100;
Console.WriteLine("Inserting {0} rows.", num.ToString(CultureInfo.CurrentUICulture));
for (int i = 0; i < num; i++)
{
t = new SampleEntity("samplestring", i.ToString(CultureInfo.InvariantCulture));
svc.AddObject(sampleTableName, t);
svc.SaveChangesWithRetries();
if ((i + 1) % 50 == 0)
{
Console.WriteLine("Inserted row {0}.", (i + 1).ToString(CultureInfo.CurrentUICulture));
}
}
Console.WriteLine("Executing query that will return many results. This can take a while...");
var qResult2 = from c in svc.CreateQuery <SampleEntity>(sampleTableName)
where c.PartitionKey == "samplestring"
select c;
TableStorageDataServiceQuery <SampleEntity> tableStorageQuery = new TableStorageDataServiceQuery <SampleEntity>(qResult2 as DataServiceQuery <SampleEntity>);
IEnumerable <SampleEntity> res = tableStorageQuery.ExecuteAllWithRetries();
Console.WriteLine("Retrieved query results:");
foreach (SampleEntity entity in res)
{
Console.WriteLine("Partition key: {0}, row key: {1}.", entity.PartitionKey, entity.RowKey);
}
Console.WriteLine("Delete all entries in the sample table.");
DeleteAllEntriesFromSampleTable(tableStorage.GetDataServiceContext(), sampleTableName);
tableStorage.DeleteTable(sampleTableName);
Console.WriteLine("Table samples finished!");
}
catch (DataServiceRequestException dsre)
{
Console.WriteLine("DataServiceRequestException: " + GetExceptionMessage(dsre));
ShowTableStorageErrorMessage(account.BaseUri.ToString());
}
catch (InvalidOperationException ioe)
{
Console.WriteLine("Storage service error: " + GetExceptionMessage(ioe));
ShowTableStorageErrorMessage(account.BaseUri.ToString());
}
}