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使用 MATLAB 查询数据

MATLAB 是一个编程和数值计算平台,用于分析数据、开发算法和创建模型。 本文介绍如何在适用于 Azure 数据资源管理器的 MATLAB 中获取授权令牌,以妨如何使用此令牌与群集进行交互。

先决条件

选择用于运行 MATLAB 的操作系统的选项卡。

  1. 从 NuGet 下载 Microsoft Identity 客户端Microsoft Identity 抽象包。

  2. lib\net45 中将下载的包和 DLL 文件提取到所选文件夹中。 在本文中,我们将会使用文件夹“C:\Matlab\DLL”。

执行用户身份验证

执行用户身份验证时,系统会提示用户通过浏览器窗口登录。 成功登录后,将授予用户授权令牌。 本部分介绍如何配置此交互式登录流。

若要执行用户身份验证,请执行以下操作:

  1. 定义授权所需的常数。 有关这些值的详细信息,请参阅授权参数

    % 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 工作室中,加载提取的 DLL 文件:

    % 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 提示用户进行交互式登录:

    % 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. 使用授权令牌通过 REST API 查询群集:

    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
    

执行应用程序身份验证

Microsoft Entra应用程序授权可用于不需要交互式登录且需要自动运行的情况。

若要执行应用程序身份验证,请执行以下操作:

  1. 预配Microsoft Entra应用程序。 在“重定向 URI”处,选择“Web”,在 URI 处输入“http://localhost:8675”。

  2. 定义授权所需的常数。 有关这些值的详细信息,请参阅授权参数

    % 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 工作室中,加载提取的 DLL 文件:

     % 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 对 Microsoft Entra 应用程序执行非交互式自动登录:

    %  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. 使用授权令牌通过 REST API 查询群集:

    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