Chilkat HOME .NET Core C# Android™ AutoIt C C# C++ Chilkat2-Python CkPython Classic ASP DataFlex Delphi ActiveX Delphi DLL Go Java Lianja Mono C# Node.js Objective-C PHP ActiveX PHP Extension Perl PowerBuilder PowerShell PureBasic Ruby SQL Server Swift 2 Swift 3,4,5... Tcl Unicode C Unicode C++ VB.NET VBScript Visual Basic 6.0 Visual FoxPro Xojo Plugin
(Unicode C) DynamoDB - DeleteItemDeletes a single item in a table by primary key. You can perform a conditional delete operation that deletes the item if it exists, or if it has an expected attribute value. For more information, see https://docs.aws.amazon.com/amazondynamodb/latest/APIReference/API_DeleteItem.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 *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.DeleteItem" \ // -d '{ // "TableName": "Thread", // "Key": { // "ForumName": { // "S": "Amazon DynamoDB" // }, // "Subject": { // "S": "How do I update multiple items?" // } // }, // "ConditionExpression": "attribute_not_exists(Replies)", // "ReturnValues": "ALL_OLD" // }' // 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": "How do I update multiple items?" // } // }, // "ConditionExpression": "attribute_not_exists(Replies)", // "ReturnValues": "ALL_OLD" // } 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"How do I update multiple items?"); CkJsonObjectW_UpdateString(json,L"ConditionExpression",L"attribute_not_exists(Replies)"); CkJsonObjectW_UpdateString(json,L"ReturnValues",L"ALL_OLD"); CkRestW_AddHeader(rest,L"Content-Type",L"application/x-amz-json-1.0"); CkRestW_AddHeader(rest,L"X-Amz-Target",L"DynamoDB_20120810.DeleteItem"); 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": "fred@example.com" // }, // "ForumName": { // "S": "Amazon DynamoDB" // }, // "LastPostDateTime": { // "S": "201303201023" // }, // "Tags": { // "SS": [ // "Update", // "Multiple Items", // "HelpMe" // ] // }, // "Subject": { // "S": "How do I update multiple items?" // }, // "Message": { // "S": "I want to update multiple items in a single call. What's the best way to do that?" // } // } // } // 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"); 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); } |
© 2000-2024 Chilkat Software, Inc. All Rights Reserved.