Chilkat Online Tools

GetTableMetadata delphiAx Example

Athena

var
rest: TChilkatRest;
success: Integer;
authAws: TChilkatAuthAws;
json: TChilkatJsonObject;
sbRequestBody: TChilkatStringBuilder;
sbResponseBody: TChilkatStringBuilder;
respStatusCode: Integer;
jResp: TChilkatJsonObject;
Comment: WideString;
v_Type: WideString;
CreateTime: Integer;
LastAccessTime: Integer;
Name: WideString;
v_String: WideString;
TableType: 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('TableName','string');

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

// {
//   "CatalogName": "string",
//   "DatabaseName": "string",
//   "TableName": "string"
// }

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

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

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

i := 0;
count_i := jResp.SizeOfArray('TableMetadata.PartitionKeys');
while i < count_i do
  begin
    jResp.I := i;
    Comment := jResp.StringOf('TableMetadata.PartitionKeys[i].Comment');
    Name := jResp.StringOf('TableMetadata.PartitionKeys[i].Name');
    v_Type := jResp.StringOf('TableMetadata.PartitionKeys[i].Type');
    i := i + 1;
  end;

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

// {
//   "TableMetadata": {
//     "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"
//   }
// }