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(Unicode C) DynamoDB - UpdateItemEdits an existing item's attributes, or adds a new item to the table if it does not already exist. You can put, delete, or add attribute values. You can also perform a conditional update on an existing item (insert a new attribute name-value pair if it doesn't exist, or replace an existing name-value pair if it has certain expected attribute values). For more information, see https://docs.aws.amazon.com/amazondynamodb/latest/APIReference/API_UpdateItem.html
#include <C_CkRestW.h> #include <C_CkAuthAwsW.h> #include <C_CkJsonObjectW.h> #include <C_CkStringBuilderW.h> void ChilkatSample(void) { HCkRestW rest; BOOL success; HCkAuthAwsW authAws; BOOL bTls; int port; BOOL bAutoReconnect; HCkJsonObjectW json; HCkStringBuilderW sbRequestBody; HCkStringBuilderW sbResponseBody; int respStatusCode; HCkJsonObjectW jsonResponse; const wchar_t *strVal; const wchar_t *AttributesLastPostedByS; const wchar_t *AttributesForumNameS; const wchar_t *AttributesLastPostDateTimeS; const wchar_t *AttributesSubjectS; const wchar_t *AttributesViewsN; const wchar_t *AttributesMessageS; int i; int count_i; rest = CkRestW_Create(); // 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.UpdateItem" \ // -d '{ // "TableName": "Thread", // "Key": { // "ForumName": { // "S": "Amazon DynamoDB" // }, // "Subject": { // "S": "Maximum number of items?" // } // }, // "UpdateExpression": "set LastPostedBy = :val1", // "ConditionExpression": "LastPostedBy = :val2", // "ExpressionAttributeValues": { // ":val1": {"S": "alice@example.com"}, // ":val2": {"S": "fred@example.com"} // }, // "ReturnValues": "ALL_NEW" // }' // Use the following online tool to generate REST code from a CURL command // Convert a cURL Command to REST Source Code authAws = CkAuthAwsW_Create(); CkAuthAwsW_putAccessKey(authAws,L"AWS_ACCESS_KEY"); CkAuthAwsW_putSecretKey(authAws,L"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.) CkAuthAwsW_putRegion(authAws,L"us-west-2"); CkAuthAwsW_putServiceName(authAws,L"dynamodb"); // SetAuthAws causes Chilkat to automatically add the following headers: Authorization, X-Amz-Date CkRestW_SetAuthAws(rest,authAws); // URL: https://dynamodb.us-west-2.amazonaws.com/ bTls = TRUE; port = 443; bAutoReconnect = TRUE; success = CkRestW_Connect(rest,L"dynamodb.us-west-2.amazonaws.com",port,bTls,bAutoReconnect); if (success != TRUE) { wprintf(L"ConnectFailReason: %d\n",CkRestW_getConnectFailReason(rest)); wprintf(L"%s\n",CkRestW_lastErrorText(rest)); CkRestW_Dispose(rest); CkAuthAwsW_Dispose(authAws); return; } // 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": "Thread", // "Key": { // "ForumName": { // "S": "Amazon DynamoDB" // }, // "Subject": { // "S": "Maximum number of items?" // } // }, // "UpdateExpression": "set LastPostedBy = :val1", // "ConditionExpression": "LastPostedBy = :val2", // "ExpressionAttributeValues": { // ":val1": { // "S": "alice@example.com" // }, // ":val2": { // "S": "fred@example.com" // } // }, // "ReturnValues": "ALL_NEW" // } json = CkJsonObjectW_Create(); CkJsonObjectW_UpdateString(json,L"TableName",L"Thread"); CkJsonObjectW_UpdateString(json,L"Key.ForumName.S",L"Amazon DynamoDB"); CkJsonObjectW_UpdateString(json,L"Key.Subject.S",L"Maximum number of items?"); CkJsonObjectW_UpdateString(json,L"UpdateExpression",L"set LastPostedBy = :val1"); CkJsonObjectW_UpdateString(json,L"ConditionExpression",L"LastPostedBy = :val2"); CkJsonObjectW_UpdateString(json,L"ExpressionAttributeValues.:val1.S",L"alice@example.com"); CkJsonObjectW_UpdateString(json,L"ExpressionAttributeValues.:val2.S",L"fred@example.com"); CkJsonObjectW_UpdateString(json,L"ReturnValues",L"ALL_NEW"); CkRestW_AddHeader(rest,L"Content-Type",L"application/x-amz-json-1.0"); CkRestW_AddHeader(rest,L"X-Amz-Target",L"DynamoDB_20120810.UpdateItem"); CkRestW_AddHeader(rest,L"Accept-Encoding",L"identity"); sbRequestBody = CkStringBuilderW_Create(); CkJsonObjectW_EmitSb(json,sbRequestBody); sbResponseBody = CkStringBuilderW_Create(); success = CkRestW_FullRequestSb(rest,L"POST",L"/",sbRequestBody,sbResponseBody); if (success != TRUE) { wprintf(L"%s\n",CkRestW_lastErrorText(rest)); CkRestW_Dispose(rest); CkAuthAwsW_Dispose(authAws); CkJsonObjectW_Dispose(json); CkStringBuilderW_Dispose(sbRequestBody); CkStringBuilderW_Dispose(sbResponseBody); return; } respStatusCode = CkRestW_getResponseStatusCode(rest); wprintf(L"response status code = %d\n",respStatusCode); if (respStatusCode >= 400) { wprintf(L"Response Status Code = %d\n",respStatusCode); wprintf(L"Response Header:\n"); wprintf(L"%s\n",CkRestW_responseHeader(rest)); wprintf(L"Response Body:\n"); wprintf(L"%s\n",CkStringBuilderW_getAsString(sbResponseBody)); CkRestW_Dispose(rest); CkAuthAwsW_Dispose(authAws); CkJsonObjectW_Dispose(json); CkStringBuilderW_Dispose(sbRequestBody); CkStringBuilderW_Dispose(sbResponseBody); return; } jsonResponse = CkJsonObjectW_Create(); CkJsonObjectW_LoadSb(jsonResponse,sbResponseBody); CkJsonObjectW_putEmitCompact(jsonResponse,FALSE); wprintf(L"%s\n",CkJsonObjectW_emit(jsonResponse)); // Sample JSON response: // (Sample code for parsing the JSON response is shown below) // { // "Attributes": { // "LastPostedBy": { // "S": "alice@example.com" // }, // "ForumName": { // "S": "Amazon DynamoDB" // }, // "LastPostDateTime": { // "S": "20130320010350" // }, // "Tags": { // "SS": [ // "Update", // "Multiple Items", // "HelpMe" // ] // }, // "Subject": { // "S": "Maximum number of items?" // }, // "Views": { // "N": "5" // }, // "Message": { // "S": "I want to put 10 million data items to an Amazon DynamoDB table. Is there an upper limit?" // } // } // } // Sample code for parsing the JSON response... // Use the following online tool to generate parsing code from sample JSON: // Generate Parsing Code from JSON AttributesLastPostedByS = CkJsonObjectW_stringOf(jsonResponse,L"Attributes.LastPostedBy.S"); AttributesForumNameS = CkJsonObjectW_stringOf(jsonResponse,L"Attributes.ForumName.S"); AttributesLastPostDateTimeS = CkJsonObjectW_stringOf(jsonResponse,L"Attributes.LastPostDateTime.S"); AttributesSubjectS = CkJsonObjectW_stringOf(jsonResponse,L"Attributes.Subject.S"); AttributesViewsN = CkJsonObjectW_stringOf(jsonResponse,L"Attributes.Views.N"); AttributesMessageS = CkJsonObjectW_stringOf(jsonResponse,L"Attributes.Message.S"); i = 0; count_i = CkJsonObjectW_SizeOfArray(jsonResponse,L"Attributes.Tags.SS"); while (i < count_i) { CkJsonObjectW_putI(jsonResponse,i); strVal = CkJsonObjectW_stringOf(jsonResponse,L"Attributes.Tags.SS[i]"); i = i + 1; } CkRestW_Dispose(rest); CkAuthAwsW_Dispose(authAws); CkJsonObjectW_Dispose(json); CkStringBuilderW_Dispose(sbRequestBody); CkStringBuilderW_Dispose(sbResponseBody); CkJsonObjectW_Dispose(jsonResponse); } |
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