public void BatchSamples()
{
EnsureTables();
{
#region BatchGet Sample 1
// Define attributes to get and keys to retrieve
List<string> attributesToGet = new List<string> { "Author", "Title", "Year" };
List<Dictionary<string, AttributeValue>> sampleTableKeys = new List<Dictionary<string, AttributeValue>>
{
new Dictionary<string, AttributeValue>
{
{ "Author", new AttributeValue { S = "Mark Twain" } },
{ "Title", new AttributeValue { S = "The Adventures of Tom Sawyer" } }
},
new Dictionary<string, AttributeValue>
{
{ "Author", new AttributeValue { S = "Mark Twain" } },
{ "Title", new AttributeValue { S = "Adventures of Huckleberry Finn" } }
}
};
// Construct get-request for first table
KeysAndAttributes sampleTableItems = new KeysAndAttributes
{
AttributesToGet = attributesToGet,
Keys = sampleTableKeys
};
#endregion
#region BatchGet Sample 2
// Define keys to retrieve
List<Dictionary<string, AttributeValue>> authorsTableKeys = new List<Dictionary<string, AttributeValue>>
{
new Dictionary<string, AttributeValue>
{
{ "Author", new AttributeValue { S = "Mark Twain" } },
},
new Dictionary<string, AttributeValue>
{
{ "Author", new AttributeValue { S = "Booker Taliaferro Washington" } },
}
};
// Construct get-request for second table
// Skip setting AttributesToGet property to retrieve all attributes
KeysAndAttributes authorsTableItems = new KeysAndAttributes
{
Keys = authorsTableKeys,
};
#endregion
#region BatchGet Sample 3
// Create a client
AmazonDynamoDBClient client = new AmazonDynamoDBClient();
// Construct table-keys mapping
Dictionary<string, KeysAndAttributes> requestItems = new Dictionary<string, KeysAndAttributes>();
requestItems["SampleTable"] = sampleTableItems;
requestItems["AuthorsTable"] = authorsTableItems;
// Construct request
BatchGetItemRequest request = new BatchGetItemRequest
{
RequestItems = requestItems
};
BatchGetItemResult result;
do
{
// Issue request and retrieve items
result = client.BatchGetItem(request);
// Iterate through responses
Dictionary<string, List<Dictionary<string, AttributeValue>>> responses = result.Responses;
foreach (string tableName in responses.Keys)
{
// Get items for each table
List<Dictionary<string, AttributeValue>> tableItems = responses[tableName];
// View items
foreach (Dictionary<string, AttributeValue> item in tableItems)
{
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>()));
}
}
}
// Some items may not have been retrieved!
// Set RequestItems to the result's UnprocessedKeys and reissue request
request.RequestItems = result.UnprocessedKeys;
} while (result.UnprocessedKeys.Count > 0);
#endregion
}
{
#region BatchWrite Sample 1
// 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" };
// Create key for item to delete from first table
// Hash-key of the target item is string value "Mark Twain"
// Range-key of the target item is string value "Tom Sawyer, Detective"
Dictionary<string, AttributeValue> keyToDelete1 = new Dictionary<string, AttributeValue>
{
{ "Author", new AttributeValue { S = "Mark Twain" } },
{ "Title", new AttributeValue { S = "Tom Sawyer, Detective" } }
};
// 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 }
});
sampleTableItems.Add(new WriteRequest
{
DeleteRequest = new DeleteRequest { Key = keyToDelete1 }
});
#endregion
#region BatchWrite Sample 2
// Create key for item to delete from second table
// Hash-key of the target item is string value "Francis Scott Key Fitzgerald"
Dictionary<string, AttributeValue> keyToDelete2 = new Dictionary<string, AttributeValue>
{
{ "Author", new AttributeValue { S = "Francis Scott Key Fitzgerald" } },
};
// Construct write-request for first table
List<WriteRequest> authorsTableItems = new List<WriteRequest>();
authorsTableItems.Add(new WriteRequest
{
DeleteRequest = new DeleteRequest { Key = keyToDelete2 }
});
#endregion
#region BatchWrite Sample 3
// Create a client
AmazonDynamoDBClient client = new AmazonDynamoDBClient();
// Construct table-keys mapping
Dictionary<string, List<WriteRequest>> requestItems = new Dictionary<string, List<WriteRequest>>();
requestItems["SampleTable"] = sampleTableItems;
requestItems["AuthorsTable"] = authorsTableItems;
BatchWriteItemRequest request = new BatchWriteItemRequest { RequestItems = requestItems };
BatchWriteItemResult result;
do
{
// Issue request and retrieve items
result = client.BatchWriteItem(request);
// Some items may not have been processed!
// Set RequestItems to the result's UnprocessedItems and reissue request
request.RequestItems = result.UnprocessedItems;
} while (result.UnprocessedItems.Count > 0);
#endregion
}
}
