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ASP.NET Core 2.2 Implementation for Consumer Data Standards

84 views   0 comments last modified about 16 days ago

I’ve just started an core 2.2 based implementation for Australia Consumer Data Standards (published by Data 61). Opening Banking initiative will follow these standards. The purpose is to help you to get familiar with these standards, especially the APIs that need to be implemented. ...

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python lite-log spark pyspark

Debug PySpark Code in Visual Studio Code

21 views   0 comments last modified about 16 days ago

The page summarizes the steps required to run and debug PySpark (Spark for Python) in Visual Studio Code. Install Python and pip Install Python from the official website: https://...

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python spark pyspark

Implement SCD Type 2 Full Merge via Spark Data Frames

304 views   0 comments last modified about 2 months ago

Overview For SQL developers that are familiar with SCD and merge statements, you may wonder how to implement the same in big data platforms, considering database or storages in Hadoop are not designed/optimised for record level updates and inserts. In this post, I’m going to demons...

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lite-log hadoop sqoop

Password Security Solution for Sqoop

37 views   0 comments last modified about 3 months ago

In Sqoop, there are multiple approaches to pass in passwords for RDBMS. Options Option 1 - clear password through --password argument sqoop [subcommand] --username user --password pwd This is the weakest approach as password is exposed directly...

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python spark

PySpark: Convert JSON String Column to Array of Object (StructType) in Data Frame

418 views   0 comments last modified about 3 months ago

This post shows how to derive new column in a Spark data frame from a JSON array string column. I am running the code in Spark 2.2.1 though it is compatible with Spark 1.6.0 (with less JSON SQL functions). Prerequisites Refer to the following post to install Spark in Windows. ...

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angular lite-log

ng is not recognized as an internal or external command (Windows 10)

751 views   0 comments last modified about 5 months ago

Problem When you follow Angular CLI installation guide in Windows, you may encounter the following error: ng is not recognized as an internal or external command The resolutions are available in the following link: ...

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java bigquery gcp dataflow gcs

Load CSV File from Google Cloud Storage to BigQuery Using Dataflow

1712 views   0 comments last modified about 7 months ago

This page documents the detailed steps to load CSV file from GCS into BigQuery using Dataflow to demo a simple data flow creation using Dataflow Tools for Eclipse. However it doesn’t necessarily mean this is the right use case for DataFlow. Alternatively ...

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azure power-bi

Advanced analytics on big data with Azure - Tutorial

493 views   0 comments last modified about 8 months ago

Microsoft Azure provides a number of data analytics related products and services. It allows users to tailor the solutions to meet different requirements, for example, architecture for modern data warehouse, advanced analytics with big data or real time analytics. The following diagram sho...

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power-bi bigquery

Use Google Cloud BigQuery as Data Source in Power BI

1118 views   0 comments last modified about 9 months ago

BigQuery is Google’s serverless data warehouse in Google Cloud. Power BI can consume data from various sources including RDBMS, NoSQL, Could, Services, etc. It is also easy to get data from BigQuery in Power BI. In this article, I am going to demonstrate how to connect to BigQuery to create...

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dotnet core lite-log

Set AttachDbFilename as Relative Path in .NET Core

882 views   0 comments last modified about 9 months ago

.NET Framework, you can use |DataDirectory| to configure connection string when connecting to SQL Server database file via attach mode: AttachDbFilename=|DataDirectory|\dbname.mdf In .NET Core, you cannot directly set SQL Server Express connec...

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dotnet core lite-log

Instantiate a Service in ConfigureServices Method in .NET Core

85 views   0 comments last modified about 9 months ago

.NET Core is built in with dependency injection. Usually method ConfigureServices in Startup class is used to register services in the container. The signature of the method looks like the following: public void ConfigureServices(IServiceC...

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kontext docu

Kontext Project is now Open Source as Docu Project

195 views   0 comments last modified about 9 months ago

Kontext project is now open source as Docu project hosted in GitHub. At the moment, only SQLite is supported and other databases will be added once version 1.0.0 is ready. SQLite is used for easy setup and testing. Prerequisites .NET Core SDK 2.1.3 .NET Core Runtime 2.1 ...

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.net core lite-log

ASP.NET Core 2.1 Error - 'Cyrillic' is not a supported encoding name

691 views   0 comments last modified about 9 months ago

After upgrading to ASP.NET Core 2.1 (.NET Core SDK 2.1.301), you may encounter the following error about encoding: System.ArgumentException    HResult=0x80070057    Message='Cyrillic' is not a supported encoding name. For information on defining a custo...

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.net core entity-framework

SQLite in .NET Core with Entity Framework Core

1529 views   0 comments last modified about 9 months ago

SQLite is a self-contained and embedded SQL database engine. In .NET Core, Entity Framework Core provides APIs to work with SQLite. This page provides sample code to create a SQLite database using package Microsoft.EntityFrameworkCore.Sqlite . Create sample project ...

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Graphics Programming and Image Processing in .NET Core 2.x

529 views   0 comments last modified about 9 months ago

In .NET Core 2.x, Windows Forms or WPF are not implemented since they are based on GDI+ and DirectX respectively in Windows. In .NET Core 3.0, there is plan to add Desktop Packs which includes UWP. WPF and Windows Forms. However, they will still be Windows-only. In .NET Core applications, you may...

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lite-log power-bi

Data Analysis Expressions to Create Static Tables in PowerBI

145 views   0 comments last modified about 10 months ago

DATATABLE StaticTable1 = DATATABLE("IntCol",INTEGER,"StringCol",STRING,{{1,"User1"},{2,"User2"}}) The above expression generates a table with two columns IntCol and StringCol : ...

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Querying Teradata and SQL Server - Tutorial 1: The SELECT Statement

33430 views   7 comments last modified about 4 years ago

SELECT is one of the most commonly used statements. In this tutorial, I will cover the following items: Two of the principal query clauses—FROM and SELECT Data Types Built-in functions CASE expressions and variations like ISNULL and COALESCE. * The functio...

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Install Teradata Express by Using VMware Player 6.0 in Windows

13821 views   23 comments last modified about 5 years ago

In this article, I am going to introduce how to install Teradata Express in virtual machines in Windows. Download software 1) Download VMware Player for Windows 32-bit and 64-bit from the following link (version 6.0): ...

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hadoop yarn hdfs

Install Hadoop 3.0.0 in Windows (Single Node)

12861 views   14 comments last modified about 2 years ago

This page summarizes the steps to install Hadoop 3.0.0 in your Windows environment. Reference page: ...

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Working with SQL Server Compact 4.0 using Entity Framework 6 and ADO.NET

11836 views   0 comments last modified about 5 years ago

SQL Server Compact 4.0 (CE 4.0) is a free SQL Server embedded database ideal for building standalone and occasionally connected applications for mobile devices, desktops, Web clients and others. In one of my projects, I used it as the database for logging errors, which assumes the errors will onl...

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Create ETL Project with Teradata through SSIS

10286 views   2 comments last modified about 4 years ago

Infosphere DataStage is adopted as ETL (Extract, Transform, Load) tool in many Teradata based data warehousing projects. With the Teradata ODBC and .NET data providers, you can also use the BI tools from Microsoft, i.e. SSIS. In my previous post, I demonstrated how to install Teradata Tool...

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Generate Formatted Excel Destination (Output) in SSIS Data Flow Task

10150 views   0 comments last modified about 5 years ago

SSIS (SQL Server Integration Service) provides a number of convenient tasks to enable data integration. Exporting data from database to Excel file is a common task in ETL (Extract, Transform, Load) projects. Constantly the users/customers may raise format request regarding the Excel extract. To g...

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Server.MapPath Equivalent in ASP.NET Core 2

9849 views   0 comments last modified about 2 years ago

In traditional applications, Server.MapPath is commonly used to generate absolute path in the web server. However, this has been removed from ASP.NET Core. So what is the equivalent way of doing it?

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dotnet core angular core 2

Issue - Unable to get property 'apply' of undefined or null reference occurred in Angular 4.*, VS2017 15.3, ASP.NET Core 2.0

7702 views   10 comments last modified about 2 years ago

Issue Context After installed Visual Studio 2017 15.3 preview and .net core 2.0 preview SDK, I upgraded one of my existing core project to 2.0. The project was created using ‘dotnet new angular’ SPA template.  I also upgraded all the client app packages to the latest. For exa...

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spark scala parquet

Write and Read Parquet Files in Spark/Scala

7223 views   2 comments last modified about 2 years ago

In this page, I’m going to demonstrate how to write and read parquet files in Spark/Scala by using Spark SQLContext class. Reference What is parquet format? Go the following project site to understand more about parquet. ...

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java kerberos

Java Kerberos Authentication Configuration Sample & SQL Server Connection Practice

7118 views   2 comments last modified about 3 years ago

Overview Recently, I have been working on an ETL framework to load various source data (i.e. files, SQL Server, Oracle and Teradata) into Teradata. Due to some limitations, Java was chosen as the implementation language though IBM Infosphere DataStage is available to use. DataStage has p...

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Connect to Teradata Virtual Machine Guest from Windows Host

6807 views   16 comments last modified about 4 years ago

In my previous posts about Querying Teradata and SQL Server, I logged into the virtual machine graphic interface to manage the database. However, I constantly found it is resource intensive as there is only 4GB memory in my laptop. Instead, I will use text mode to start the virtual machine and co...

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Retrieve Identity username, email and other information in ASP.NET Core

6412 views   0 comments last modified about 2 years ago

The identity system in ASP.NET has evolved over time. If you are using ASP.NET Core, you probably found User property is an instance of ClaimsPrincipal in Controller or Razor views. Thus to retrieve the information, you need to utilize the claims.

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[C#] Connect to Teradata Database via .NET Data Provider

5228 views   2 comments last modified about 4 years ago

In this post, I will demonstrate how to connect to Teradata database via .NET Data Provider for Teradata using C#. Prerequisites Install the .NET Data Provider for Teradata from the following link: ...

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teradata python

Connect to Teradata database through Python

4631 views   3 comments last modified about 2 years ago

Teradata published an official Python module which can be used in DevOps projects. More details can be found at the following GitHub site: Install Teradata module ...

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Create and Debug C/C++ Programs with Eclipse and Cygwin in Windows

4541 views   0 comments last modified about 4 years ago

In this post, I am going to demonstrate how to use Eclipse to create and debug C/C++ programs for Unix/Linux in Windows. I am going to use Cygwin GCC as toolchains. Cygwin GDB will also be installed for debugging purpose. I am using Windows 10 and JRE 1.8 in the following steps. Install E...

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Resolve the Issues in Upgrading Entity Framework to Version 6.1

4505 views   0 comments last modified about 5 years ago

When upgrading your Entity Framework to Entity Framework 6.1 (EF6) from version 5.0, you may meet a number of issues. I have summarized all the issues I’ve encountered and their resolutions for your reference. Upgrade to EF6 Microsoft has provided one summary about upgrading to E...

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about 2 days ago

Hi, is your issue resolved?  If not, please paste your detailed error messages here. 

about 17 days ago


Did you setup the ODBC data source successfully?

If you are encountering connection issues from your windows host to the VM, you can check my following post to ensure the connection is well established:

Connect to Teradata Virtual Machine Guest from Windows Host

about 18 days ago

thx a lot for this tutorial. But I have a problem to ensure the connection of python (installed into windows) to Teradata (installed into VMWare in the same computer).

What shoul I do?

about 10 months ago

I can get it work by using the following approach:

1) Create an IIS website (http://localhost/Test/) with one page index.html:

        <h1>Test iframe</h1>
        <iframe src="http://localhost:8080/#/notebook/2D7J63CN7" width="600px" height="400px" style="border:1px solid #000000"></iframe>

2) And then open the website in the browser: http://localhost/Test/

If you open with a file URL, then the content cannot be displayed due to security reasons:


When you publish your website, your Zeppelin site should also be deployed into a server that your user can access.

about 10 months ago

Hi Raymond Tang. I come back because I tried but I didn't succeded to embed a zeppelin notebook as an iframe in my website. I have something like that  

<div id="interactivForm">

                                <iframe id="MyInterpreter" src="http://localhost:8085/#/notebook/2DHDGTVNU"></iframe>
                           </div> in my website but it doesn't work. But I can access to http://localhost:8085/#/notebook/2DHDGTVNU without problem. Do you know how to do that?
Thank you.

about 10 months ago

You can use <iframe> html element to embed Zeppelin into your website.

This also means that your Zeppelin website (*:8080 by default) needs to be exposed to all your users (i.e. their networks).

about 10 months ago

Hi Raymond. Now I don't really want to do any authentification. I want only to give an opportunity to anonymous user to execute spark in my website using zeppelin. So do you know how to do that or do you have a tutorial where I can see how to do that step by step? Thank you very much.

about 10 months ago

You can embed Zeppelin into a website.

However you need to decide how to pass through user credentials from your website to Zeppelin website depends on the authentication type. 

The authentication part you can reference to the following website: 

Based on my current understanding, I don't think currently you can directly implement the automatic logon without extending Zeppelin (but I might be wrong). 

about 10 months ago

Hi everyone,

do you know if it is possible to embed Zeppelin Notebook in a webpage? Like as an iframe or another method? So that users can come and execute their own code? Do you think that is possible? Has someone an idea to do that? Thank you!

about 10 months ago

Nw, I'm glad it worked. :)

about 10 months ago

I am sorry. It works!

about 10 months ago

I come again and sorry. When I run this commande %HADOOP_HOME%\bin\hdfs dfs -put file:///G:/DataAnalytics/test.txt / I get an error: put: `G:/DataAnalytics/test.txt': No such file or directory. But I followed the configuration step by step and my DataAnalytics folder is in G:.

about 10 months ago

Hi. thank you for your answer. I found a solution for my problem. If it can help someone, the problem was related to the syntax of my system username. It contains a space. So, to fixe it, you can edit /etc/hadoop/hadoop-env.cmd, at the end of this file, you will find set HADOOP_IDENT_STRING=%USERNAME% , change this with a string that you want but without space. For example: set HADOOP_IDENT_STRING=myuser, the problem will be fixed.

about 10 months ago

Did you follow all the steps in this post? For example, you need to ensure winutils tool is installed: 

Overwrite your bin folder (%HADOOP_HOME%\bin) with the files from this link:

The current available version is 3.0.0 and I am not very sure whether it can fix the issue for 3.0.1 but worth giving it a try.

about 10 months ago

Good morning, I am trying to install hadoop 3.0.1 in my windows but when I want to test my configuration it gives me that error: Error: Can not find or load the main class. Can someone help me please?

Thank you


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