Chilkat Online Tools

StartQueryExecution C++ Example

Athena

#include <CkRest.h>
#include <CkAuthAws.h>
#include <CkJsonObject.h>
#include <CkStringBuilder.h>

void ChilkatSample(void)
    {
    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    CkRest rest;
    bool success;

    CkAuthAws authAws;
    authAws.put_AccessKey("AWS_ACCESS_KEY");
    authAws.put_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.put_Region("us-west-2");
    authAws.put_ServiceName("athena");
    // SetAuthAws causes Chilkat to automatically add the following headers: Authorization, X-Amz-Date
    rest.SetAuthAws(authAws);

    // URL: https://athena.us-west-2.amazonaws.com/
    // Use the same region as specified above.
    success = rest.Connect("athena.us-west-2.amazonaws.com",443,true,true);
    if (success != true) {
        std::cout << "ConnectFailReason: " << rest.get_ConnectFailReason() << "\r\n";
        std::cout << rest.lastErrorText() << "\r\n";
        return;
    }

    // The following code creates the JSON request body.
    // The JSON created by this code is shown below.

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

    CkJsonObject json;
    json.UpdateString("ClientRequestToken","string");
    json.UpdateString("QueryExecutionContext.Catalog","string");
    json.UpdateString("QueryExecutionContext.Database","string");
    json.UpdateString("QueryString","string");
    json.UpdateString("ResultConfiguration.AclConfiguration.S3AclOption","string");
    json.UpdateString("ResultConfiguration.EncryptionConfiguration.EncryptionOption","string");
    json.UpdateString("ResultConfiguration.EncryptionConfiguration.KmsKey","string");
    json.UpdateString("ResultConfiguration.ExpectedBucketOwner","string");
    json.UpdateString("ResultConfiguration.OutputLocation","string");
    json.UpdateString("WorkGroup","string");

    // The JSON request body created by the above code:

    // {
    //   "ClientRequestToken": "string",
    //   "QueryExecutionContext": {
    //     "Catalog": "string",
    //     "Database": "string"
    //   },
    //   "QueryString": "string",
    //   "ResultConfiguration": {
    //     "AclConfiguration": {
    //       "S3AclOption": "string"
    //     },
    //     "EncryptionConfiguration": {
    //       "EncryptionOption": "string",
    //       "KmsKey": "string"
    //     },
    //     "ExpectedBucketOwner": "string",
    //     "OutputLocation": "string"
    //   },
    //   "WorkGroup": "string"
    // }

    rest.AddHeader("Content-Type","application/x-amz-json-1.1");
    rest.AddHeader("X-Amz-Target","AmazonAthena.StartQueryExecution");

    CkStringBuilder sbRequestBody;
    json.EmitSb(sbRequestBody);
    CkStringBuilder sbResponseBody;
    success = rest.FullRequestSb("POST","/",sbRequestBody,sbResponseBody);
    if (success != true) {
        std::cout << rest.lastErrorText() << "\r\n";
        return;
    }

    int respStatusCode = rest.get_ResponseStatusCode();
    std::cout << "response status code = " << respStatusCode << "\r\n";
    if (respStatusCode != 200) {
        std::cout << "Response Header:" << "\r\n";
        std::cout << rest.responseHeader() << "\r\n";
        std::cout << "Response Body:" << "\r\n";
        std::cout << sbResponseBody.getAsString() << "\r\n";
        return;
    }

    CkJsonObject jResp;
    jResp.LoadSb(sbResponseBody);

    // The following code parses the JSON response.
    // A sample JSON response is shown below the sample code.

    // Use this online tool to generate parsing code from sample JSON:
    // Generate Parsing Code from JSON

    // Chilkat functions returning "const char *" return a pointer to temporary internal memory owned and managed by Chilkat.
    // See this example explaining how this memory should be used: const char * functions.

    const char *QueryExecutionId = jResp.stringOf("QueryExecutionId");

    // A sample JSON response body parsed by the above code:

    // {
    //   "QueryExecutionId": "string"
    // }
    }