Chilkat Online Tools

ListTableMetadata delphiAx Example

Athena

var
rest: TChilkatRest;
success: Integer;
authAws: TChilkatAuthAws;
json: TChilkatJsonObject;
sbRequestBody: TChilkatStringBuilder;
sbResponseBody: TChilkatStringBuilder;
respStatusCode: Integer;
jResp: TChilkatJsonObject;
CreateTime: Integer;
LastAccessTime: Integer;
Name: WideString;
v_String: WideString;
TableType: WideString;
j: Integer;
count_j: Integer;
Comment: WideString;
v_Type: WideString;
NextToken: WideString;
i: Integer;
count_i: Integer;

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

rest := TChilkatRest.Create(Self);

authAws := TChilkatAuthAws.Create(Self);
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.ControlInterface);

// URL: https://athena.us-west-2.amazonaws.com/
// Use the same region as specified above.
success := rest.Connect('athena.us-west-2.amazonaws.com',443,1,1);
if (success <> 1) then
  begin
    Memo1.Lines.Add('ConnectFailReason: ' + IntToStr(rest.ConnectFailReason));
    Memo1.Lines.Add(rest.LastErrorText);
    Exit;
  end;

// 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

json := TChilkatJsonObject.Create(Self);
json.UpdateString('CatalogName','string');
json.UpdateString('DatabaseName','string');
json.UpdateString('Expression','string');
json.UpdateInt('MaxResults',123);
json.UpdateString('NextToken','string');

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

// {
//   "CatalogName": "string",
//   "DatabaseName": "string",
//   "Expression": "string",
//   "MaxResults": number,
//   "NextToken": "string"
// }

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

sbRequestBody := TChilkatStringBuilder.Create(Self);
json.EmitSb(sbRequestBody.ControlInterface);
sbResponseBody := TChilkatStringBuilder.Create(Self);
success := rest.FullRequestSb('POST','/',sbRequestBody.ControlInterface,sbResponseBody.ControlInterface);
if (success <> 1) then
  begin
    Memo1.Lines.Add(rest.LastErrorText);
    Exit;
  end;
respStatusCode := rest.ResponseStatusCode;
Memo1.Lines.Add('response status code = ' + IntToStr(respStatusCode));
if (respStatusCode <> 200) then
  begin
    Memo1.Lines.Add('Response Header:');
    Memo1.Lines.Add(rest.ResponseHeader);
    Memo1.Lines.Add('Response Body:');
    Memo1.Lines.Add(sbResponseBody.GetAsString());
    Exit;
  end;

jResp := TChilkatJsonObject.Create(Self);
jResp.LoadSb(sbResponseBody.ControlInterface);

// 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

NextToken := jResp.StringOf('NextToken');
i := 0;
count_i := jResp.SizeOfArray('TableMetadataList');
while i < count_i do
  begin
    jResp.I := i;
    CreateTime := jResp.IntOf('TableMetadataList[i].CreateTime');
    LastAccessTime := jResp.IntOf('TableMetadataList[i].LastAccessTime');
    Name := jResp.StringOf('TableMetadataList[i].Name');
    v_String := jResp.StringOf('TableMetadataList[i].Parameters.string');
    TableType := jResp.StringOf('TableMetadataList[i].TableType');
    j := 0;
    count_j := jResp.SizeOfArray('TableMetadataList[i].Columns');
    while j < count_j do
      begin
        jResp.J := j;
        Comment := jResp.StringOf('TableMetadataList[i].Columns[j].Comment');
        Name := jResp.StringOf('TableMetadataList[i].Columns[j].Name');
        v_Type := jResp.StringOf('TableMetadataList[i].Columns[j].Type');
        j := j + 1;
      end;

    j := 0;
    count_j := jResp.SizeOfArray('TableMetadataList[i].PartitionKeys');
    while j < count_j do
      begin
        jResp.J := j;
        Comment := jResp.StringOf('TableMetadataList[i].PartitionKeys[j].Comment');
        Name := jResp.StringOf('TableMetadataList[i].PartitionKeys[j].Name');
        v_Type := jResp.StringOf('TableMetadataList[i].PartitionKeys[j].Type');
        j := j + 1;
      end;

    i := i + 1;
  end;

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

// {
//   "NextToken": "string",
//   "TableMetadataList": [
//     {
//       "Columns": [
//         {
//           "Comment": "string",
//           "Name": "string",
//           "Type": "string"
//         }
//       ],
//       "CreateTime": number,
//       "LastAccessTime": number,
//       "Name": "string",
//       "Parameters": {
//         "string": "string"
//       },
//       "PartitionKeys": [
//         {
//           "Comment": "string",
//           "Name": "string",
//           "Type": "string"
//         }
//       ],
//       "TableType": "string"
//     }
//   ]
// }