Chilkat Online Tools

GetQueryResults Objective-C Example

Athena

#import <CkoRest.h>
#import <CkoAuthAws.h>
#import <CkoJsonObject.h>
#import <CkoStringBuilder.h>
#import <NSString.h>

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

CkoRest *rest = [[CkoRest alloc] init];
BOOL success;

CkoAuthAws *authAws = [[CkoAuthAws alloc] init];
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 = @"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" port: [NSNumber numberWithInt: 443] tls: YES autoReconnect: YES];
if (success != YES) {
    NSLog(@"%@%d",@"ConnectFailReason: ",[rest.ConnectFailReason intValue]);
    NSLog(@"%@",rest.LastErrorText);
    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

CkoJsonObject *json = [[CkoJsonObject alloc] init];
[json UpdateInt: @"MaxResults" value: [NSNumber numberWithInt: 123]];
[json UpdateString: @"NextToken" value: @"string"];
[json UpdateString: @"QueryExecutionId" value: @"string"];

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

// {
//   "MaxResults": number,
//   "NextToken": "string",
//   "QueryExecutionId": "string"
// }

[rest AddHeader: @"Content-Type" value: @"application/x-amz-json-1.1"];
[rest AddHeader: @"X-Amz-Target" value: @"AmazonAthena.GetQueryResults"];

CkoStringBuilder *sbRequestBody = [[CkoStringBuilder alloc] init];
[json EmitSb: sbRequestBody];
CkoStringBuilder *sbResponseBody = [[CkoStringBuilder alloc] init];
success = [rest FullRequestSb: @"POST" uriPath: @"/" requestBody: sbRequestBody responseBody: sbResponseBody];
if (success != YES) {
    NSLog(@"%@",rest.LastErrorText);
    return;
}

int respStatusCode = [rest.ResponseStatusCode intValue];
NSLog(@"%@%d",@"response status code = ",respStatusCode);
if (respStatusCode != 200) {
    NSLog(@"%@",@"Response Header:");
    NSLog(@"%@",rest.ResponseHeader);
    NSLog(@"%@",@"Response Body:");
    NSLog(@"%@",[sbResponseBody GetAsString]);
    return;
}

CkoJsonObject *jResp = [[CkoJsonObject alloc] init];
[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

int CaseSensitive;
NSString *CatalogName = 0;
NSString *Label = 0;
NSString *Name = 0;
NSString *Nullable = 0;
int Precision;
int Scale;
NSString *SchemaName = 0;
NSString *TableName = 0;
NSString *v_Type = 0;
int j;
int count_j;
NSString *VarCharValue = 0;

NSString *NextToken = [jResp StringOf: @"NextToken"];
int UpdateCount = [[jResp IntOf: @"UpdateCount"] intValue];
int i = 0;
int count_i = [[jResp SizeOfArray: @"ResultSet.ResultSetMetadata.ColumnInfo"] intValue];
while (i < count_i) {
    jResp.I = [NSNumber numberWithInt: i];
    CaseSensitive = [[jResp IntOf: @"ResultSet.ResultSetMetadata.ColumnInfo[i].CaseSensitive"] intValue];
    CatalogName = [jResp StringOf: @"ResultSet.ResultSetMetadata.ColumnInfo[i].CatalogName"];
    Label = [jResp StringOf: @"ResultSet.ResultSetMetadata.ColumnInfo[i].Label"];
    Name = [jResp StringOf: @"ResultSet.ResultSetMetadata.ColumnInfo[i].Name"];
    Nullable = [jResp StringOf: @"ResultSet.ResultSetMetadata.ColumnInfo[i].Nullable"];
    Precision = [[jResp IntOf: @"ResultSet.ResultSetMetadata.ColumnInfo[i].Precision"] intValue];
    Scale = [[jResp IntOf: @"ResultSet.ResultSetMetadata.ColumnInfo[i].Scale"] intValue];
    SchemaName = [jResp StringOf: @"ResultSet.ResultSetMetadata.ColumnInfo[i].SchemaName"];
    TableName = [jResp StringOf: @"ResultSet.ResultSetMetadata.ColumnInfo[i].TableName"];
    v_Type = [jResp StringOf: @"ResultSet.ResultSetMetadata.ColumnInfo[i].Type"];
    i = i + 1;
}

i = 0;
count_i = [[jResp SizeOfArray: @"ResultSet.Rows"] intValue];
while (i < count_i) {
    jResp.I = [NSNumber numberWithInt: i];
    j = 0;
    count_j = [[jResp SizeOfArray: @"ResultSet.Rows[i].Data"] intValue];
    while (j < count_j) {
        jResp.J = [NSNumber numberWithInt: j];
        VarCharValue = [jResp StringOf: @"ResultSet.Rows[i].Data[j].VarCharValue"];
        j = j + 1;
    }

    i = i + 1;
}

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

// {
//   "NextToken": "string",
//   "ResultSet": {
//     "ResultSetMetadata": {
//       "ColumnInfo": [
//         {
//           "CaseSensitive": boolean,
//           "CatalogName": "string",
//           "Label": "string",
//           "Name": "string",
//           "Nullable": "string",
//           "Precision": number,
//           "Scale": number,
//           "SchemaName": "string",
//           "TableName": "string",
//           "Type": "string"
//         }
//       ]
//     },
//     "Rows": [
//       {
//         "Data": [
//           {
//             "VarCharValue": "string"
//           }
//         ]
//       }
//     ]
//   },
//   "UpdateCount": number
// }