|
public Scan ( |
||
| request | Container for the necessary parameters to execute the Scan service method. | |
| return | ||
public void InstantiateIn(System.Web.UI.Control container)
{
AmazonDynamoDBClient client = new AmazonDynamoDBClient();
// string tableName = "Attendee";
var request = new ScanRequest
{
TableName = "QuizQuestion",
};
var response = client.Scan(request);
List<QuestionData> questionDataList = new List<QuestionData>();
foreach (Dictionary<string, AttributeValue> item in response.ScanResult.Items)
{
// Process the result.
QuestionData question = new QuestionData();
if (item.ContainsKey("options"))
{
foreach (var itemNew in item["options"].M)
{
Label link = new Label();
link.ID = "linkmodel";
container.Controls.Add(link);
link.Text = itemNew.Value.S;
//Label value = questionData.FindControl("options") as Label;
////testM = itemNew.Key.ToString();
//value.Text = itemNew.Value.S;
}
}
}
}
public List<Dictionary<string, object>> GetPinWithUserIDs(List<string> userIDs, double since, int takeCnt)
{
List<Dictionary<string, object>> retval = new List<Dictionary<string, object>>();
Dictionary<string, object> tmpObject = null;
var config = new AmazonDynamoDBConfig();
config.ServiceURL = System.Configuration.ConfigurationManager.AppSettings["ServiceURL"];
client = new AmazonDynamoDBClient(config);
List<AttributeValue> users = new List<AttributeValue>();
foreach (string item in userIDs)
{
users.Add(new AttributeValue() { S = item });
}
try
{
ScanRequest sreq = new ScanRequest()
{
TableName = "Pin",
ScanFilter = new Dictionary<string, Condition>()
{
{ "Owner",
new Condition
{
ComparisonOperator = ComparisonOperator.IN,
AttributeValueList = users
}
},
{
"PinDate",
new Condition()
{
ComparisonOperator = ComparisonOperator.LT,
AttributeValueList = new List<AttributeValue> { new AttributeValue { N = since.ToString() } }
}
}
}
};
var response = client.Scan(sreq);
foreach (var item in response.Items)
{
tmpObject = new Dictionary<string, object>();
tmpObject.Add("Title", item["Title"].S);
tmpObject.Add("Owner", item["Owner"].S);
tmpObject.Add("OwnerName", item["UserName"].S);
tmpObject.Add("OwnerHeadshot", item["HeadshotURL"].S);
tmpObject.Add("Latitude", item["Latitude"].S);
tmpObject.Add("Longitude", item["Longitude"].S);
tmpObject.Add("PinDate", Convert.ToDouble(item["PinDate"].N));
tmpObject.Add("Images", item["Images"].SS);
retval.Add(tmpObject);
}
retval = retval.OrderByDescending(a => a["PinDate"]).ToList<Dictionary<string, object>>();
}
catch (AmazonDynamoDBException e) { Console.WriteLine(e.Message); }
catch (AmazonServiceException e) { Console.WriteLine(e.Message); }
catch (Exception e) { Console.WriteLine(e.Message); }
return retval;
}
private static void SelectSpecificAttributes(AmazonDynamoDBClient client, DynamoDBContext context)
{
var selectQuery = string.Format("SELECT GameTitle, TopScoreDateTime FROM GameScores WHERE GameTitle = \"{0}\"", StarshipX);
Console.WriteLine("(AmazonDynamoDBClient) Running basic scan :\n\t\t{0}", selectQuery);
var response = client.Scan(selectQuery);
Debug.Assert(response.Items.Count == 1000);
Debug.Assert(response.Items.TrueForAll(i => i["GameTitle"].S == StarshipX));
Debug.Assert(response.Items.TrueForAll(i => i.Count == 2));
Console.WriteLine("(DynamoDBContext) Running basic scan :\n\t\t{0}", selectQuery);
var gameScores = context.ExecScan<GameScore>(selectQuery).ToArray();
Debug.Assert(gameScores.Count() == 1000);
Debug.Assert(gameScores.All(gs => gs.GameTitle == StarshipX));
Debug.Assert(gameScores.All(gs => gs.TopScoreDateTime > default(DateTime) &&
gs.Wins == 0 && gs.Losses == 0 && gs.TopScore == 0 &&
String.IsNullOrWhiteSpace(gs.UserId)));
}
private static void ScanWithNoReturnedConsumedCapacity(AmazonDynamoDBClient client)
{
var selectQuery = string.Format("SELECT * FROM GameScores WHERE GameTitle = \"{0}\" WITH (NoReturnedCapacity)", StarshipX);
Console.WriteLine("(AmazonDynamoDBClient) Running scan with NoReturnedCapacity :\n\t\t{0}", selectQuery);
var response = client.Scan(selectQuery);
Debug.Assert(response.Items.Count == 1000);
Debug.Assert(response.Items.TrueForAll(i => i["GameTitle"].S == StarshipX));
Debug.Assert(response.ConsumedCapacity == null);
}
private static void ScanWithScanPageSizeAndSegments(AmazonDynamoDBClient client, DynamoDBContext context)
{
var selectQuery = string.Format("SELECT * FROM GameScores WHERE GameTitle = \"{0}\" WITH (PageSize(20), Segments(2))", StarshipX);
Console.WriteLine("(AmazonDynamoDBClient) Running scan with PageSize and 2 segments :\n\t\t{0}", selectQuery);
var response = client.Scan(selectQuery);
Debug.Assert(response.Items.Count == 1000);
Debug.Assert(response.Items.TrueForAll(i => i["GameTitle"].S == StarshipX));
Console.WriteLine("(DynamoDBContext) Running scan with PageSize and 2 segments :\n\t\t{0}", selectQuery);
var gameScores = context.ExecScan<GameScore>(selectQuery).ToArray();
Debug.Assert(gameScores.Count() == 1000);
Debug.Assert(gameScores.All(gs => gs.GameTitle == StarshipX));
}
private static void BasicScan(AmazonDynamoDBClient client, DynamoDBContext context)
{
var selectQuery = string.Format("SELECT * FROM GameScores WHERE GameTitle = \"{0}\"", StarshipX);
Console.WriteLine("(AmazonDynamoDBClient) Running basic scan :\n\t\t{0}", selectQuery);
var response = client.Scan(selectQuery);
Debug.Assert(response.Items.Count == 1000);
Debug.Assert(response.Items.TrueForAll(i => i["GameTitle"].S == StarshipX));
Console.WriteLine("(DynamoDBContext) Running basic scan :\n\t\t{0}", selectQuery);
var gameScores = context.ExecScan<GameScore>(selectQuery).ToArray();
Debug.Assert(gameScores.Count() == 1000);
Debug.Assert(gameScores.All(gs => gs.GameTitle == StarshipX));
}
public void SearchSamples()
{
RemoveTables();
CreateLSITable();
TableUtils.WaitUntilTableActive("SampleTable", TestClient);
{
// Create items to put into first table
Dictionary<string, AttributeValue> item1 = new Dictionary<string, AttributeValue>();
item1["Author"] = new AttributeValue { S = "Mark Twain" };
item1["Title"] = new AttributeValue { S = "A Connecticut Yankee in King Arthur's Court" };
item1["Pages"] = new AttributeValue { N = "575" };
Dictionary<string, AttributeValue> item2 = new Dictionary<string, AttributeValue>();
item2["Author"] = new AttributeValue { S = "Booker Taliaferro Washington" };
item2["Title"] = new AttributeValue { S = "My Larger Education" };
item2["Pages"] = new AttributeValue { N = "313" };
item2["Year"] = new AttributeValue { N = "1911" };
// Construct write-request for first table
List<WriteRequest> sampleTableItems = new List<WriteRequest>();
sampleTableItems.Add(new WriteRequest
{
PutRequest = new PutRequest { Item = item1 }
});
sampleTableItems.Add(new WriteRequest
{
PutRequest = new PutRequest { Item = item2 }
});
AmazonDynamoDBClient client = new AmazonDynamoDBClient();
client.BatchWriteItem(new BatchWriteItemRequest
{
RequestItems = new Dictionary<string, List<WriteRequest>>
{
{ "SampleTable", sampleTableItems }
}
});
PutSample();
}
{
#region Query Sample
// Create a client
AmazonDynamoDBClient client = new AmazonDynamoDBClient();
// Define item hash-key to be string value "Mark Twain"
AttributeValue hashKey = new AttributeValue { S = "Mark Twain" };
// Define query condition to search for range-keys that begin with the string "The Adventures"
Condition condition = new Condition
{
ComparisonOperator = "BEGINS_WITH",
AttributeValueList = new List<AttributeValue>
{
new AttributeValue { S = "The Adventures" }
}
};
// Create the key conditions from hashKey and condition
Dictionary<string, Condition> keyConditions = new Dictionary<string, Condition>
{
// Hash key condition. ComparisonOperator must be "EQ".
{
"Author",
new Condition
{
ComparisonOperator = "EQ",
AttributeValueList = new List<AttributeValue> { hashKey }
}
},
// Range key condition
{
"Title",
condition
}
};
// Define marker variable
Dictionary<string, AttributeValue> startKey = null;
do
{
// Create Query request
QueryRequest request = new QueryRequest
{
TableName = "SampleTable",
ExclusiveStartKey = startKey,
KeyConditions = keyConditions
};
// Issue request
var result = client.Query(request);
// View all returned items
List<Dictionary<string, AttributeValue>> items = result.Items;
foreach (Dictionary<string, AttributeValue> item in items)
{
Console.WriteLine("Item:");
foreach (var keyValuePair in item)
{
Console.WriteLine("{0} : S={1}, N={2}, SS=[{3}], NS=[{4}]",
keyValuePair.Key,
keyValuePair.Value.S,
keyValuePair.Value.N,
string.Join(", ", keyValuePair.Value.SS ?? new List<string>()),
string.Join(", ", keyValuePair.Value.NS ?? new List<string>()));
}
}
// Set marker variable
startKey = result.LastEvaluatedKey;
} while (startKey != null && startKey.Count > 0);
#endregion
}
{
#region Query Local Secondary Index Sample
// Create a client
AmazonDynamoDBClient client = new AmazonDynamoDBClient();
// Define item hash-key to be string value "Mark Twain"
AttributeValue hashKey = new AttributeValue { S = "Mark Twain" };
// Define query condition to search for range-keys ("Year", in "YearsIndex") that are less than 1900
Condition condition = new Condition
{
ComparisonOperator = "LT",
AttributeValueList = new List<AttributeValue>
{
new AttributeValue { N = "1900" }
}
};
// Create the key conditions from hashKey and condition
Dictionary<string, Condition> keyConditions = new Dictionary<string, Condition>
{
// Hash key condition. ComparisonOperator must be "EQ".
{
"Author",
new Condition
{
ComparisonOperator = "EQ",
AttributeValueList = new List<AttributeValue> { hashKey }
}
},
// Range key condition
{
"Year", // Reference the correct range key when using indexes
condition
}
};
// Define marker variable
Dictionary<string, AttributeValue> startKey = null;
do
{
// Create Query request
QueryRequest request = new QueryRequest
{
TableName = "SampleTable",
ExclusiveStartKey = startKey,
KeyConditions = keyConditions,
IndexName = "YearsIndex" // Specify the index to query against
};
// Issue request
var result = client.Query(request);
// View all returned items
List<Dictionary<string, AttributeValue>> items = result.Items;
foreach (Dictionary<string, AttributeValue> item in items)
{
Console.WriteLine("Item:");
foreach (var keyValuePair in item)
{
Console.WriteLine("{0} : S={1}, N={2}, SS=[{3}], NS=[{4}]",
keyValuePair.Key,
keyValuePair.Value.S,
keyValuePair.Value.N,
string.Join(", ", keyValuePair.Value.SS ?? new List<string>()),
string.Join(", ", keyValuePair.Value.NS ?? new List<string>()));
}
}
// Set marker variable
startKey = result.LastEvaluatedKey;
} while (startKey != null && startKey.Count > 0);
#endregion
}
{
#region Scan Sample
// Create a client
AmazonDynamoDBClient client = new AmazonDynamoDBClient();
// Define scan conditions
Dictionary<string, Condition> conditions = new Dictionary<string, Condition>();
// Title attribute should contain the string "Adventures"
Condition titleCondition = new Condition();
titleCondition.ComparisonOperator = ComparisonOperator.CONTAINS;
titleCondition.AttributeValueList.Add(new AttributeValue { S = "Adventures" });
conditions["Title"] = titleCondition;
// Pages attributes must be greater-than the numeric value "200"
Condition pagesCondition = new Condition();
pagesCondition.ComparisonOperator = ComparisonOperator.GT;;
pagesCondition.AttributeValueList.Add(new AttributeValue { N = "200" });
conditions["Pages"] = pagesCondition;
// Define marker variable
Dictionary<string, AttributeValue> startKey = null;
do
{
// Create Scan request
ScanRequest request = new ScanRequest
{
TableName = "SampleTable",
ExclusiveStartKey = startKey,
ScanFilter = conditions
};
// Issue request
ScanResult result = client.Scan(request);
// View all returned items
List<Dictionary<string, AttributeValue>> items = result.Items;
foreach (Dictionary<string, AttributeValue> item in items)
{
Console.WriteLine("Item:");
foreach (var keyValuePair in item)
{
Console.WriteLine("{0} : S={1}, N={2}, SS=[{3}], NS=[{4}]",
keyValuePair.Key,
keyValuePair.Value.S,
keyValuePair.Value.N,
string.Join(", ", keyValuePair.Value.SS ?? new List<string>()),
string.Join(", ", keyValuePair.Value.NS ?? new List<string>()));
}
}
// Set marker variable
startKey = result.LastEvaluatedKey;
} while (startKey != null && startKey.Count > 0);
#endregion
}
{
// Create lots of items to put into first table
var table = Amazon.DynamoDBv2.DocumentModel.Table.LoadTable(TestClient, "SampleTable");
var batchWrite = table.CreateBatchWrite();
for (int i = 0; i < 100; i++)
{
var document = new Amazon.DynamoDBv2.DocumentModel.Document();
document["Author"] = "FakeAuthor" + i;
document["Title"] = "Book" + i;
document["Pages"] = (180 + i);
document["Year"] = 1900 + i;
batchWrite.AddDocumentToPut(document);
}
batchWrite.Execute();
}
{
#region Parallel Scan Sample
// Create a client
AmazonDynamoDBClient client = new AmazonDynamoDBClient();
// Define scan conditions
Dictionary<string, Condition> conditions = new Dictionary<string, Condition>();
// Pages attributes must be greater-than the numeric value "200"
Condition pagesCondition = new Condition();
pagesCondition.ComparisonOperator = ComparisonOperator.GT;
pagesCondition.AttributeValueList.Add(new AttributeValue { N = "200" });
conditions["Pages"] = pagesCondition;
// Setup 10 simultaneous threads, each thread calling Scan operation
// with its own segment value.
int totalSegments = 10;
Parallel.For(0, totalSegments, segment =>
{
// Define marker variable
Dictionary<string, AttributeValue> startKey = null;
do
{
// Create Scan request
ScanRequest request = new ScanRequest
{
TableName = "SampleTable",
ExclusiveStartKey = startKey,
ScanFilter = conditions,
// Total segments to split the table into
TotalSegments = totalSegments,
// Current segment to scan
Segment = segment
};
// Issue request
var result = client.Scan(request);
// Write returned items to file
string path = string.Format("ParallelScan-{0}-of-{1}.txt", totalSegments, segment);
List<Dictionary<string, AttributeValue>> items = result.Items;
using (Stream stream = File.OpenWrite(path))
using (StreamWriter writer = new StreamWriter(stream))
{
foreach (Dictionary<string, AttributeValue> item in items)
{
writer.WriteLine("Item:");
foreach (var keyValuePair in item)
{
writer.WriteLine("{0} : S={1}, N={2}, SS=[{3}], NS=[{4}]",
keyValuePair.Key,
keyValuePair.Value.S,
keyValuePair.Value.N,
string.Join(", ", keyValuePair.Value.SS ?? new List<string>()),
string.Join(", ", keyValuePair.Value.NS ?? new List<string>()));
}
}
}
// Set marker variable
startKey = result.LastEvaluatedKey;
} while (startKey != null && startKey.Count > 0);
});
#endregion
}
}
public virtual List<Dictionary<string, AttributeValue>> GetImageItems(AmazonDynamoDBClient dynamoDbClient)
{
try
{
string tableName = ConfigurationManager.AppSettings["SESSIONTABLE"];
string keyPrefix = ConfigurationManager.AppSettings["PARAM3"];
var scanRequest = new ScanRequest
{
Select = "ALL_ATTRIBUTES",
TableName = tableName
};
// If the filter criteria is empty, then don't filter it.
if (!String.IsNullOrEmpty(keyPrefix))
{
scanRequest.ScanFilter = new Dictionary<string, Condition>
{
{
"Key",
new Condition
{
ComparisonOperator = "BEGINS_WITH",
AttributeValueList = new List<AttributeValue>
{
new AttributeValue {S = keyPrefix}
}
}
}
};
}
return dynamoDbClient.Scan(scanRequest).Items;
}
catch (Exception ex)
{
_Default.LogMessageToPage("GetImageItems Error: {0}", ex.Message);
return null;
}
}
