static void Main(string[] args)
{
// Get an AmazonDynamoDBClient for the local DynamoDB database
AmazonDynamoDBClient client = GetLocalClient();
// Get a Table object for the table that you created in Step 1
Table table = GetTableObject(client, "Movies");
if (table == null)
{
PauseForDebugWindow();
return;
}
/*-----------------------------------------------------------------------
* 4.1.1: Call Table.Query to initiate a query for all movies with
* year == 1985, using an empty filter expression.
*-----------------------------------------------------------------------*/
Search search;
try
{
search = table.Query(1985, new Expression());
}
catch (Exception ex)
{
Console.WriteLine("\n Error: 1985 query failed because: " + ex.Message);
PauseForDebugWindow();
return;
}
// Display the titles of the movies returned by this query
List <Document> docList = new List <Document>();
Console.WriteLine("\n All movies released in 1985:" +
"\n-----------------------------------------------");
do
{
try { docList = search.GetNextSet(); }
catch (Exception ex)
{
Console.WriteLine("\n Error: Search.GetNextStep failed because: " + ex.Message);
break;
}
foreach (var doc in docList)
{
Console.WriteLine(" " + doc["title"]);
}
} while (!search.IsDone);
/*-----------------------------------------------------------------------
* 4.1.2a: Call Table.Query to initiate a query for all movies where
* year equals 1992 AND title is between "B" and "Hzzz",
* returning the lead actor and genres of each.
*-----------------------------------------------------------------------*/
Primitive y_1992 = new Primitive("1992", true);
QueryOperationConfig config = new QueryOperationConfig();
config.Filter = new QueryFilter();
config.Filter.AddCondition("year", QueryOperator.Equal, new DynamoDBEntry[] { 1992 });
config.Filter.AddCondition("title", QueryOperator.Between, new DynamoDBEntry[] { "B", "Hzz" });
config.AttributesToGet = new List <string> {
"title", "info"
};
config.Select = SelectValues.SpecificAttributes;
try
{
search = table.Query(config);
}
catch (Exception ex)
{
Console.WriteLine("\n Error: 1992 query failed because: " + ex.Message);
PauseForDebugWindow();
return;
}
// Display the movie information returned by this query
Console.WriteLine("\n\n Movies released in 1992 with titles between \"B\" and \"Hzz\" (Document Model):" +
"\n-----------------------------------------------------------------------------");
docList = new List <Document>();
Document infoDoc;
do
{
try
{
docList = search.GetNextSet();
}
catch (Exception ex)
{
Console.WriteLine("\n Error: Search.GetNextStep failed because: " + ex.Message);
break;
}
foreach (var doc in docList)
{
infoDoc = doc["info"].AsDocument();
Console.WriteLine(movieFormatString,
doc["title"],
infoDoc["actors"].AsArrayOfString()[0],
string.Join(commaSep, infoDoc["genres"].AsArrayOfString()));
}
} while (!search.IsDone);
/*-----------------------------------------------------------------------
* 4.1.2b: Call AmazonDynamoDBClient.Query to initiate a query for all
* movies where year equals 1992 AND title is between M and Tzz,
* returning the genres and the lead actor of each.
*-----------------------------------------------------------------------*/
QueryRequest qRequest = new QueryRequest
{
TableName = "Movies",
ExpressionAttributeNames = new Dictionary <string, string>
{
{ "#yr", "year" }
},
ExpressionAttributeValues = new Dictionary <string, AttributeValue>
{
{ ":y_1992", new AttributeValue {
N = "1992"
} },
{ ":M", new AttributeValue {
S = "M"
} },
{ ":Tzz", new AttributeValue {
S = "Tzz"
} }
},
KeyConditionExpression = "#yr = :y_1992 and title between :M and :Tzz",
ProjectionExpression = "title, info.actors[0], info.genres"
};
QueryResponse qResponse;
try
{
qResponse = client.Query(qRequest);
}
catch (Exception ex)
{
Console.WriteLine("\n Error: Low-level query failed, because: " + ex.Message);
PauseForDebugWindow();
return;
}
// Display the movie information returned by this query
Console.WriteLine("\n\n Movies released in 1992 with titles between \"M\" and \"Tzz\" (low-level):" +
"\n-------------------------------------------------------------------------");
foreach (Dictionary <string, AttributeValue> item in qResponse.Items)
{
Dictionary <string, AttributeValue> info = item["info"].M;
Console.WriteLine(movieFormatString,
item["title"].S,
info["actors"].L[0].S,
GetDdbListAsString(info["genres"].L));
}
}
