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使用 MATLAB 查詢資料

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MATLAB 是一種程式設計和數值運算平臺，可用來分析資料、開發演算法及建立模型。 本文說明如何在 MATLAB for Azure Data Explorer中取得授權權杖，以及如何使用權杖與您的叢集互動。

必要條件

選取用來執行 MATLAB 之作業系統的索引標籤。

  1. 從 NuGet 下載 Microsoft 身分識別用戶端 和 Microsoft 身分識別抽象 套件。

  2. 將下載的套件和 DLL 檔案從 lib\net45 解壓縮到您選擇的資料夾。 在本文中，我們將使用 C：\Matlab\DLL資料夾。

執行使用者驗證

使用使用者驗證時，系統會提示使用者透過瀏覽器視窗登入。 成功登入時，會授與使用者授權權杖。 本節說明如何設定此互動式登入流程。

若要執行使用者驗證：

  1. 定義授權所需的常數。 如需這些值的詳細資訊，請參閱 驗證參數。

    % The Azure Data Explorer cluster URL
clusterUrl = 'https://<adx-cluster>.kusto.windows.net';
% The Azure AD tenant ID
tenantId = '';
% Send a request to https://<adx-cluster>.kusto.windows.net/v1/rest/auth/metadata
% The appId should be the value of KustoClientAppId
appId = '';
% The Azure AD scopes
scopesToUse = strcat(clusterUrl,'/.default ');

  2. 在 MATLAB Studio 中，載入擷取的 DLL 檔案：

    % Access the folder that contains the DLL files
dllFolder = fullfile("C:","Matlab","DLL");

% Load the referenced assemblies in the MATLAB session
matlabDllFiles = dir(fullfile(dllFolder,'*.dll'));
for k = 1:length(matlabDllFiles)
    baseFileName = matlabDllFiles(k).name;
    fullFileName = fullfile(dllFolder,baseFileName);
    fprintf(1, 'Reading  %s\n', fullFileName);
end
    % Load the downloaded assembly in MATLAB
    NET.addAssembly(fullFileName);

  3. 使用 PublicClientApplicationBuilder 提示使用者互動式登入：

    % Create an PublicClientApplicationBuilder
app = Microsoft.Identity.Client.PublicClientApplicationBuilder.Create(appId)...
    .WithAuthority(Microsoft.Identity.Client.AzureCloudInstance.AzurePublic,tenantId)...
    .WithRedirectUri('http://localhost:8675')...
    .Build();

% System.Net.ServicePointManager.SecurityProtocol = System.Net.SecurityProtocolType.Tls12;
NET.setStaticProperty ('System.Net.ServicePointManager.SecurityProtocol',System.Net.SecurityProtocolType.Tls12)
% Start with creating a list of scopes
scopes = NET.createGeneric('System.Collections.Generic.List',{'System.String'});
% Add the actual scopes
scopes.Add(scopesToUse);
fprintf(1, 'Using appScope  %s\n', scopesToUse);

% Get the token from the service
% and show the interactive dialog in which the user can login
tokenAcquirer = app.AcquireTokenInteractive(scopes);
result = tokenAcquirer.ExecuteAsync;

% Extract the token and when it expires
% and retrieve the returned token
token = char(result.Result.AccessToken);
fprintf(2, 'User token aquired and will expire at %s & extended expires at %s', result.Result.ExpiresOn.LocalDateTime.ToString,result.Result.ExtendedExpiresOn.ToLocalTime.ToString);

  4. 使用授權權杖透過 REST API查詢叢集：

    options=weboptions('HeaderFields',{'RequestMethod','POST';'Accept' 'application/json';'Authorization' ['Bearer ', token]; 'Content-Type' 'application/json; charset=utf-8'; 'Connection' 'Keep-Alive'; 'x-ms-app' 'Matlab'; 'x-ms-client-request-id' 'Matlab-Query-Request'});

% The DB and KQL variables represent the database and query to execute
querydata = struct('db', "<DB>", 'csl', "<KQL>");
querryresults  = webwrite("https://sdktestcluster.westeurope.dev.kusto.windows.net/v2/rest/query", querydata, options);

% Extract the results row
results=querryresults{3}.Rows

執行應用程式驗證

Microsoft Entra應用程式授權可用於不需要互動式登入且需要自動化執行的案例。

若要執行應用程式驗證：

  1. 布建Microsoft Entra應用程式。 針對 [ 重新導向 URI]，選取 [Web ] 和 [輸入 http://localhost:8675 ] 作為 URI。

  2. 定義授權所需的常數。 如需這些值的詳細資訊，請參閱 驗證參數。

    % The Azure Data Explorer cluster URL
clusterUrl = 'https://<adx-cluster>.kusto.windows.net';
% The Azure AD tenant ID
tenantId = '';
% The Azure AD application ID and key
appId = '';
appSecret = '';

  3. 在 MATLAB Studio 中，載入擷取的 DLL 檔案：

     % Access the folder that contains the DLL files
 dllFolder = fullfile("C:","Matlab","DLL");

 % Load the referenced assemblies in the MATLAB session
 matlabDllFiles = dir(fullfile(dllFolder,'*.dll'));
 for k = 1:length(matlabDllFiles)
     baseFileName = matlabDllFiles(k).name;
     fullFileName = fullfile(dllFolder,baseFileName);
     fprintf(1, 'Reading  %s\n', fullFileName);
 end
     % Load the downloaded assembly
     NET.addAssembly(fullFileName);

  4. 使用ConfidentialClientApplicationBuilder搭配 Microsoft Entra 應用程式執行非互動式的自動化登入：

    %  Create an ConfidentialClientApplicationBuilder
app = Microsoft.Identity.Client.ConfidentialClientApplicationBuilder.Create(appId)...
    .WithAuthority(Microsoft.Identity.Client.AzureCloudInstance.AzurePublic,tenantId)...
    .WithRedirectUri('http://localhost:8675')...
    .WithClientSecret(appSecret)...
    .Build();

% System.Net.ServicePointManager.SecurityProtocol = System.Net.SecurityProtocolType.Tls12;
NET.setStaticProperty ('System.Net.ServicePointManager.SecurityProtocol',System.Net.SecurityProtocolType.Tls12)
% Start with creating a list of scopes
scopes = NET.createGeneric('System.Collections.Generic.List',{'System.String'});
% Add the actual scopes
scopes.Add(scopesToUse);
fprintf(1, 'Using appScope  %s\n', scopesToUse);

% Get the token from the service and cache it until it expires
tokenAcquirer = app.AcquireTokenForClient(scopes);
result = tokenAcquirer.ExecuteAsync;

% Extract the token and when it expires
% retrieve the returned token
token = char(result.Result.AccessToken);
fprintf(2, 'User token aquired and will expire at %s & extended expires at %s', result.Result.ExpiresOn.LocalDateTime.ToString,result.Result.ExtendedExpiresOn.ToLocalTime.ToString);

  5. 使用授權權杖透過 REST API查詢叢集：

    options=weboptions('HeaderFields',{'RequestMethod','POST';'Accept' 'application/json';'Authorization' ['Bearer ', token]; 'Content-Type' 'application/json; charset=utf-8'; 'Connection' 'Keep-Alive'; 'x-ms-app' 'Matlab'; 'x-ms-client-request-id' 'Matlab-Query-Request'});

% The DB and KQL variables represent the database and query to execute
querydata = struct('db', "<DB>", 'csl', "<KQL>");
querryresults  = webwrite("https://sdktestcluster.westeurope.dev.kusto.windows.net/v2/rest/query", querydata, options);

% Extract the results row
results=querryresults{3}.Rows

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