更改 PowerPivot 文件中的连接数据

Question

所以我遇到了一个有趣的问题。我需要在 PowerPivot 查询中指定自定义 WHERE 子句。我必须根据外部条件来改变它。我想编辑该文件并保存副本。知道如何做到这一点吗？我从二进制文件打开了 PowerPivot 文件，但它似乎已加密...

Answer 1

您可以转到现有连接，然后在那里进行更新。如果您再次打开相同的数据源（SQL、SSRS 或其他任何数据源）而不是更改现有连接上的参数，则会降低性能，因为 PowerPivot 会将这些数据视为单独的连接。

Answer 2

解决方案是以 Zip 形式打开 Excel 工作簿（使用 Package 类）。

如果您想修改查询，则可以。 /xl/customData/item1.data 处的文件是一个备份文件，代表用于处理查询的 PowerPivot 数据库（只是在 Vertipaq 模式下运行的 Analysis Services 数据库）。您需要将文件恢复到在 Vertipaq 模式下运行的 SSAS 实例。完成后，将查询编写为 ALTER 脚本。修改脚本（在本例中，将 @projectId 替换为我的实际项目 ID），然后针对数据库运行它们。完成所有这些后，备份数据库并放回到 Excel 工作簿中。这会修改查询。

连接数据存储在 /xl/connections.xml 文件中。打开它，修改并替换。再次重新打包，现在您又拥有了一本工作簿。

这是我制作的代码。您必须根据需要调用这些方法。基本的想法已经有了，但是......

    const string DBName = "Testing";
    const string OriginalBackupPath = @"\\MyLocation\BKUP.abf";
    const string ModifiedBackupPath = @"\\MyLocation\BKUPAfter.abf";
    const string ServerPath = @"machineName\powerpivot";

    private static readonly Server srv = new Server();
    private static readonly Scripter scripter = new Scripter();
    private static Database db;

    private static byte[] GetPackagePartContents(string packagePath, string partPath)
    {
        var pack = Package.Open(packagePath, FileMode.OpenOrCreate, FileAccess.ReadWrite);
        var part = pack.GetPart(new Uri(partPath, UriKind.Relative));
        var stream = part.GetStream();
        var b = new byte[stream.Length];
        stream.Read(b, 0, b.Length);
        stream.Flush();
        stream.Close();
        pack.Flush();
        pack.Close();
        return b;
    }

    private static void WritePackagePartContents(string packagePath, string partPath, byte[] contents)
    {
        var uri = new Uri(partPath, UriKind.Relative);
        var pack = Package.Open(packagePath, FileMode.OpenOrCreate, FileAccess.ReadWrite);
        var part = pack.GetPart(uri);
        var type = part.ContentType;
        pack.DeletePart(uri);
        pack.CreatePart(uri, type);
        part = pack.GetPart(uri);
        var stream = part.GetStream();
        stream.Write(contents, 0, contents.Length);
        stream.Flush();
        stream.Close();
        pack.Flush();
        pack.Close();
    }

    private static void RestoreBackup(string server, string dbName, string backupPath)
    {
        srv.Connect(server);
        if (srv.Databases.FindByName(dbName) != null) { srv.Databases.FindByName(dbName).Drop(); srv.Update(); }
        srv.Restore(backupPath, dbName, true);
        srv.Update();
        srv.Refresh();
    }

    private static void WriteContentsToFile(byte[] contents, string filePath)
    {
        var fileStream = File.Open(filePath, FileMode.OpenOrCreate, FileAccess.Write);
        fileStream.Write(contents, 0, contents.Length);
        fileStream.Flush();
        fileStream.Close();
    }

    private static byte[] ReadContentsFromFile(string filePath)
    {
        var fileStream = File.Open(filePath, FileMode.OpenOrCreate, FileAccess.Write);
        var b = new byte[fileStream.Length];
        fileStream.Read(b, 0, b.Length);
        fileStream.Flush();
        fileStream.Close();
        return b;
    }

    private static XDocument GetAlterScript(MajorObject obj)
    {
        var stream = new MemoryStream();
        var streamWriter = XmlWriter.Create(stream);
        scripter.ScriptAlter(new[] { obj }, streamWriter, false);
        streamWriter.Flush();
        streamWriter.Close();
        stream.Flush();
        stream.Position = 0;
        var b = new byte[stream.Length];
        stream.Read(b, 0, b.Length);
        var alterString = new string(Encoding.UTF8.GetString(b).ToCharArray().Where(w => w != 65279).ToArray());
        var alter = XDocument.Parse(alterString);
        stream.Close();
        return alter;
    }

    private static void ExecuteScript(string script)
    {
        srv.Execute(script);
        srv.Update();
        db.Process();
        db.Refresh();
    }



    private static void ProcessPowerpointQueries(string bookUrl, string projectId)
    {
        byte[] b = GetPackagePartContents(bookUrl, "/xl/customData/item1.data");
        WriteContentsToFile(b, OriginalBackupPath);
        RestoreBackup(ServerPath, DBName, OriginalBackupPath);
        var db = srv.Databases.GetByName(DBName);
        var databaseView = db.DataSourceViews.FindByName("Sandbox");
        var databaseViewAlter = GetAlterScript(databaseView);
        var cube = db.Cubes.FindByName("Sandbox");
        var measureGroup = cube.MeasureGroups.FindByName("Query");
        var partition = measureGroup.Partitions.FindByName("Query");
        var partitionAlter = GetAlterScript(partition);
        var regex = new Regex(@"\s@projectid=\w*[ ,]");
        var newDatabaseViewAlter = databaseViewAlter.ToString().Replace(regex.Match(databaseViewAlter.ToString()).Value.Trim(',',' '), @"@projectid=" + projectId);
        ExecuteScript(newDatabaseViewAlter);
        var newPartitionAlter = partitionAlter.ToString().Replace(regex.Match(partitionAlter.ToString()).Value.Trim(',', ' '), @"@projectid=" + projectId);
        ExecuteScript(newPartitionAlter);
        db.Backup(ModifiedBackupPath, true);
        WritePackagePartContents(bookUrl, @"/xl/customData/item1.data", ReadContentsFromFile(ModifiedBackupPath));
        db.Drop();
        srv.Disconnect();
    }

    private static void ProcessWorkbookLinks(string bookUrl, string newCoreUrl)
    {
        var connectionsFile = GetPackagePartContents(bookUrl, @"/xl/connections.xml");
        var connectionsXml = Encoding.UTF8.GetString(connectionsFile);
        connectionsXml = connectionsXml.Replace(
            new Regex(@"Data Source=\S*;").Match(connectionsXml).Value.Trim(';'), @"Data Source=" + newCoreUrl);
        WritePackagePartContents(bookUrl, @"/xl/connections.xml", connectionsXml.Replace(@"https://server/site/", newCoreUrl).ToCharArray().Select(Convert.ToByte).ToArray());
    }