Innovenergy_trunk/csharp/App/Backend/Database/Delete.cs

using InnovEnergy.App.Backend.DataTypes;
using InnovEnergy.App.Backend.DataTypes.Methods;
using InnovEnergy.App.Backend.Relations;


namespace InnovEnergy.App.Backend.Database;


public static partial class Db 
{
    public static Boolean Delete(Folder folder)
    {
        var deleteSuccess= RunTransaction(DeleteFolderAndAllItsDependencies);
        if (deleteSuccess)
        {
            BackupDatabase();
        }

        return deleteSuccess;

        Boolean DeleteFolderAndAllItsDependencies()
        {
            return folder
                  .DescendantFoldersAndSelf()
                  .All(DeleteDescendantFolderAndItsDependencies);
        }
        
        Boolean DeleteDescendantFolderAndItsDependencies(Folder f)
        {
            FolderAccess  .Delete(r => r.FolderId == f.Id);
            Installations.Delete(r => r.ParentId == f.Id);
            var delete = Folders.Delete(r => r.Id == f.Id);            
            
            return delete>0;
        }
    }

    public static Boolean Delete(Installation installation)
    {
        var deleteSuccess = RunTransaction(DeleteInstallationAndItsDependencies);
        if (deleteSuccess)
            BackupDatabase();
        return deleteSuccess;
        
        
        Boolean DeleteInstallationAndItsDependencies()
        {
            InstallationAccess.Delete(i => i.InstallationId == installation.Id);
            OrderNumber2Installation.Delete(i => i.InstallationId == installation.Id);
            return Installations.Delete(i => i.Id == installation.Id) > 0;
        }
    }

    public static Boolean Delete(User user)
    {
        var deleteSuccess = RunTransaction(DeleteUserAndHisDependencies);
        if (deleteSuccess)
            BackupDatabase();
        return deleteSuccess;
        
        Boolean DeleteUserAndHisDependencies()
        {
            FolderAccess      .Delete(u => u.UserId == user.Id);
            InstallationAccess.Delete(u => u.UserId == user.Id);

            return Users.Delete(u => u.Id == user.Id) > 0;
        }
    }
    
    
    #pragma warning disable CS0618
    
    // private!!
    private static Boolean Delete(Session session)
    {
        var delete = Sessions.Delete(s => s.Id == session.Id) > 0;
        if (delete) 
            BackupDatabase();
        return delete;
    }
}