(PowerShell) DynamoDB - Query

The Query operation finds items based on primary key values. You can query any table or secondary index that has a composite primary key (a partition key and a sort key).

For more information, see https://docs.aws.amazon.com/amazondynamodb/latest/APIReference/API_Query.html

Chilkat .NET Downloads Chilkat .NET Assemblies

Add-Type -Path "C:\chilkat\ChilkatDotNet47-9.5.0-x64\ChilkatDotNet47.dll"

$rest = New-Object Chilkat.Rest

# Implements the following CURL command:

# curl -X POST https://dynamodb.us-west-2.amazonaws.com/ \
#   -H "Accept-Encoding: identity" \
#   -H "Content-Type: application/x-amz-json-1.0" \
#   -H "Authorization: AWS4-HMAC-SHA256 Credential=<Credential>, SignedHeaders=<Headers>, Signature=<Signature>" \
#   -H "X-Amz-Date: <Date>" \
#   -H "X-Amz-Target: DynamoDB_20120810.Query" \
#   -d '{
#     "TableName": "Reply",
#     "IndexName": "PostedBy-Index",
#     "Limit": 3,
#     "ConsistentRead": true,
#     "ProjectionExpression": "Id, PostedBy, ReplyDateTime",
#     "KeyConditionExpression": "Id = :v1 AND PostedBy BETWEEN :v2a AND :v2b",
#     "ExpressionAttributeValues": {
#         ":v1": {"S": "Amazon DynamoDB#DynamoDB Thread 1"},
#         ":v2a": {"S": "User A"},
#         ":v2b": {"S": "User C"}
#     },
#     "ReturnConsumedCapacity": "TOTAL"
# }'

# Use the following online tool to generate REST code from a CURL command
# Convert a cURL Command to REST Source Code

$authAws = New-Object Chilkat.AuthAws
$authAws.AccessKey = "AWS_ACCESS_KEY"
$authAws.SecretKey = "AWS_SECRET_KEY"
# Don't forget to change the region to your particular region. (Also make the same change in the call to Connect below.)
$authAws.Region = "us-west-2"
$authAws.ServiceName = "dynamodb"
# SetAuthAws causes Chilkat to automatically add the following headers: Authorization, X-Amz-Date
$rest.SetAuthAws($authAws)

# URL: https://dynamodb.us-west-2.amazonaws.com/
$bTls = $true
$port = 443
$bAutoReconnect = $true
$success = $rest.Connect("dynamodb.us-west-2.amazonaws.com",$port,$bTls,$bAutoReconnect)
if ($success -ne $true) {
    $("ConnectFailReason: " + $rest.ConnectFailReason)
    $($rest.LastErrorText)
    exit
}

# Note: The above code does not need to be repeatedly called for each REST request.
# The rest object can be setup once, and then many requests can be sent.  Chilkat will automatically
# reconnect within a FullRequest* method as needed.  It is only the very first connection that is explicitly
# made via the Connect method.

# Use this online tool to generate code from sample JSON:
# Generate Code to Create JSON

# The following JSON is sent in the request body.

# {
#   "TableName": "Reply",
#   "IndexName": "PostedBy-Index",
#   "Limit": 3,
#   "ConsistentRead": true,
#   "ProjectionExpression": "Id, PostedBy, ReplyDateTime",
#   "KeyConditionExpression": "Id = :v1 AND PostedBy BETWEEN :v2a AND :v2b",
#   "ExpressionAttributeValues": {
#     ":v1": {
#       "S": "Amazon DynamoDB#DynamoDB Thread 1"
#     },
#     ":v2a": {
#       "S": "User A"
#     },
#     ":v2b": {
#       "S": "User C"
#     }
#   },
#   "ReturnConsumedCapacity": "TOTAL"
# }

$json = New-Object Chilkat.JsonObject
$json.UpdateString("TableName","Reply")
$json.UpdateString("IndexName","PostedBy-Index")
$json.UpdateInt("Limit",3)
$json.UpdateBool("ConsistentRead",$true)
$json.UpdateString("ProjectionExpression","Id, PostedBy, ReplyDateTime")
$json.UpdateString("KeyConditionExpression","Id = :v1 AND PostedBy BETWEEN :v2a AND :v2b")
$json.UpdateString("ExpressionAttributeValues.:v1.S","Amazon DynamoDB#DynamoDB Thread 1")
$json.UpdateString("ExpressionAttributeValues.:v2a.S","User A")
$json.UpdateString("ExpressionAttributeValues.:v2b.S","User C")
$json.UpdateString("ReturnConsumedCapacity","TOTAL")

$rest.AddHeader("Content-Type","application/x-amz-json-1.0")
$rest.AddHeader("X-Amz-Target","DynamoDB_20120810.Query")
$rest.AddHeader("Accept-Encoding","identity")

$sbRequestBody = New-Object Chilkat.StringBuilder
$json.EmitSb($sbRequestBody)
$sbResponseBody = New-Object Chilkat.StringBuilder
$success = $rest.FullRequestSb("POST","/",$sbRequestBody,$sbResponseBody)
if ($success -ne $true) {
    $($rest.LastErrorText)
    exit
}

$respStatusCode = $rest.ResponseStatusCode
$("response status code = " + $respStatusCode)
if ($respStatusCode -ge 400) {
    $("Response Status Code = " + $respStatusCode)
    $("Response Header:")
    $($rest.ResponseHeader)
    $("Response Body:")
    $($sbResponseBody.GetAsString())
    exit
}

$jsonResponse = New-Object Chilkat.JsonObject
$jsonResponse.LoadSb($sbResponseBody)

$jsonResponse.EmitCompact = $false
$($jsonResponse.Emit())

# Sample JSON response:
# (Sample code for parsing the JSON response is shown below)

# {
#   "ConsumedCapacity": {
#     "CapacityUnits": 1,
#     "TableName": "Reply"
#   },
#   "Count": 2,
#   "Items": [
#     {
#       "ReplyDateTime": {
#         "S": "2015-02-18T20:27:36.165Z"
#       },
#       "PostedBy": {
#         "S": "User A"
#       },
#       "Id": {
#         "S": "Amazon DynamoDB#DynamoDB Thread 1"
#       }
#     },
#     {
#       "ReplyDateTime": {
#         "S": "2015-02-25T20:27:36.165Z"
#       },
#       "PostedBy": {
#         "S": "User B"
#       },
#       "Id": {
#         "S": "Amazon DynamoDB#DynamoDB Thread 1"
#       }
#     }
#   ],
#   "ScannedCount": 2
# }

# Sample code for parsing the JSON response...
# Use the following online tool to generate parsing code from sample JSON:
# Generate Parsing Code from JSON

$ConsumedCapacityCapacityUnits = $jsonResponse.IntOf("ConsumedCapacity.CapacityUnits")
$ConsumedCapacityTableName = $jsonResponse.StringOf("ConsumedCapacity.TableName")
$Count = $jsonResponse.IntOf("Count")
$ScannedCount = $jsonResponse.IntOf("ScannedCount")
$i = 0
$count_i = $jsonResponse.SizeOfArray("Items")
while ($i -lt $count_i) {
    $jsonResponse.I = $i
    $ReplyDateTimeS = $jsonResponse.StringOf("Items[i].ReplyDateTime.S")
    $PostedByS = $jsonResponse.StringOf("Items[i].PostedBy.S")
    $IdS = $jsonResponse.StringOf("Items[i].Id.S")
    $i = $i + 1
}