Chilkat Online Tools

DescribeTable delphiAx Example

Amazon Redshift Data API

var
rest: TChilkatRest;
success: Integer;
authAws: TChilkatAuthAws;
json: TChilkatJsonObject;
sbRequestBody: TChilkatStringBuilder;
sbResponseBody: TChilkatStringBuilder;
respStatusCode: Integer;
jResp: TChilkatJsonObject;
columnDefault: WideString;
isCaseSensitive: Integer;
isCurrency: Integer;
isSigned: Integer;
label: WideString;
length: Integer;
name: WideString;
nullable: Integer;
precision: Integer;
scale: Integer;
schemaName: WideString;
tableName: WideString;
typeName: WideString;
NextToken: WideString;
TableName: 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 := 'redshift-data';
// SetAuthAws causes Chilkat to automatically add the following headers: Authorization, X-Amz-Date
rest.SetAuthAws(authAws.ControlInterface);

// URL: https://redshift-data.us-west-2.amazonaws.com/
// Use the same region as specified above.
success := rest.Connect('redshift-data.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('ClusterIdentifier','string');
json.UpdateString('ConnectedDatabase','string');
json.UpdateString('Database','string');
json.UpdateString('DbUser','string');
json.UpdateInt('MaxResults',123);
json.UpdateString('NextToken','string');
json.UpdateString('Schema','string');
json.UpdateString('SecretArn','string');
json.UpdateString('Table','string');

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

// {
//   "ClusterIdentifier": "string",
//   "ConnectedDatabase": "string",
//   "Database": "string",
//   "DbUser": "string",
//   "MaxResults": number,
//   "NextToken": "string",
//   "Schema": "string",
//   "SecretArn": "string",
//   "Table": "string"
// }

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

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');
TableName := jResp.StringOf('TableName');
i := 0;
count_i := jResp.SizeOfArray('ColumnList');
while i < count_i do
  begin
    jResp.I := i;
    columnDefault := jResp.StringOf('ColumnList[i].columnDefault');
    isCaseSensitive := jResp.IntOf('ColumnList[i].isCaseSensitive');
    isCurrency := jResp.IntOf('ColumnList[i].isCurrency');
    isSigned := jResp.IntOf('ColumnList[i].isSigned');
    label := jResp.StringOf('ColumnList[i].label');
    length := jResp.IntOf('ColumnList[i].length');
    name := jResp.StringOf('ColumnList[i].name');
    nullable := jResp.IntOf('ColumnList[i].nullable');
    precision := jResp.IntOf('ColumnList[i].precision');
    scale := jResp.IntOf('ColumnList[i].scale');
    schemaName := jResp.StringOf('ColumnList[i].schemaName');
    tableName := jResp.StringOf('ColumnList[i].tableName');
    typeName := jResp.StringOf('ColumnList[i].typeName');
    i := i + 1;
  end;

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

// {
//   "ColumnList": [
//     {
//       "columnDefault": "string",
//       "isCaseSensitive": boolean,
//       "isCurrency": boolean,
//       "isSigned": boolean,
//       "label": "string",
//       "length": number,
//       "name": "string",
//       "nullable": number,
//       "precision": number,
//       "scale": number,
//       "schemaName": "string",
//       "tableName": "string",
//       "typeName": "string"
//     }
//   ],
//   "NextToken": "string",
//   "TableName": "string"
// }