blog

2026

May 09, 2026: Visualizing PostgreSQL Query Plans
May 03, 2026: Securing an ASP.NET Core OData Service using Attribute-based Access Control
April 17, 2026: Who's locking my file? Find out with FileLockCheck for Windows!
March 23, 2026: Dynamic Mappings with the TinyCsvParser 3.0.0 API
March 21, 2026: Introducing the new TinyCsvParser 3.0.0 API
March 20, 2026: Introducing the new JSqlServerBulkInsert 6.0.0 API
March 16, 2026: Introducing the new PostgreSQLCopyHelper 3.0.0 API
March 14, 2026: Introducing the new PgBulkInsert 9.0.0 API
January 31, 2026: LingoLearner - Learning and Creating Cloze Tests
January 11, 2026: Building a Routing Application using PostGIS, OpenStreetMap, PgRouting and MapLibre

2025

December 28, 2025: Creating State Machine Diagrams
January 18, 2025: Using Policy-based authorization for OData requests

2024

August 16, 2024: Auditing and Versioning Data in SQLite
August 14, 2024: Flight Tracking with the OpenSky Network API, Angular and ASP.NET Core
August 10, 2024: Experimenting with SQLite FTS5
July 28, 2024: Multitenancy with Spring Boot using Postgres Row Level Security
July 26, 2024: Providing Multitenancy with Spring Boot and PostgreSQL Row Level Security (Revisited)
July 24, 2024: Using the Elasticsearch Ingest Attachments plugin with .NET
June 21, 2024: Elasticsearch: Enabling HTTPS for Local Development in Docker
May 07, 2024: Using Enumerations in ASP.NET Core Routes
April 18, 2024: Restoring a SQL Server Database Backup using Docker
April 17, 2024: Using Testcontainers in .NET
April 08, 2024: Implementing the Outbox Pattern with Postgres and .NET
April 02, 2024: Using Postgres Logical Replication for Data Change Events in .NET
March 29, 2024: Using Postgres Notifications in .NET for Data Change Notifications
January 11, 2024: Blazor WebAssembly with Cookie Authentication
January 03, 2024: Binding an Enumeration to a FluentSelect in Blazor FluentUI
January 02, 2024: Custom Form Validation with ASP.NET Core Blazor

2023

December 12, 2023: Using Raw SQL with EntityFramework Core for Efficient SQL Queries
December 04, 2023: Google Zanzibar: Implementing the Check API and Expand API using .NET
November 09, 2023: OData, OpenAPI and Kiota for building API Clients and using it in Blazor
September 21, 2023: Analyzing German Weather Data using Open Data, .NET and SQL
August 28, 2023: Using the GitHub REST API with .NET
August 26, 2023: Executing GIT Commands from .NET using a Process
August 07, 2023: Extending a Fluent UI Blazor DataGrid for Filtering and Sorting with OData
July 23, 2023: Implementing a Code Search: A Frontend with ASP.NET Core Blazor (Part 3)
July 21, 2023: Implementing a Code Search: Indexing Git Repositories using PowerShell (Part 2)
July 20, 2023: Implementing a Code Search: Elasticsearch and ASP.NET Core Backend (Part 1)
June 22, 2023: Inovking a RESTful API with PowerShell
June 21, 2023: Adding an AuthorizeFilter with a dynamic Policy to the ASP.NET Core MVC Pipeline
April 17, 2023: Linear Interpolation with Microsoft SQL Server 2022
April 02, 2023: Using Microsoft SQL Server Temporal Tables and EntityFramework Core to Audit a Database
March 28, 2023: Using T4 Templates for generating TypeScript
March 27, 2023: Generating JSON in Microsoft SQL Server 2012+
March 27, 2023: Deserializing JSON in TypeScript

2022

November 28, 2022: Authentication and Authorization for an ASP.NET Core OData API
August 27, 2022: Building an Angular Frontend for an ASP.NET Core OData Application
August 24, 2022: An ASP.NET Core OData Example using the Wide WorldImporters database and Entity Framework Core

2021

December 05, 2021: Providing Multitenancy with ASP.NET Core and PostgreSQL Row Level Security
November 20, 2021: Providing Multitenancy with Spring Boot WebFlux
November 07, 2021: Bulk Updates and Inserts with PostgreSQL using Composite Types
October 17, 2021: Parsing Command Line Arguments in .NET
February 25, 2021: Using SQL Server Table-valued Parameters (TVP) for Bulk Inserts

2020

August 22, 2020: Enabling CORS for StaticFiles in ASP.NET Core
June 20, 2020: Renaming the Database Model of ASP.NET Core Identity
June 20, 2020: SqlQuery with EntityFramework Core 3
May 24, 2020: Building a Fulltext Search Engine with ASP.NET Core, Angular 9, Elasticsearch and Tesseract
April 26, 2020: Providing Multitenancy with Spring Boot
April 04, 2020: Using the Neo4j .NET 4.0 Driver
March 19, 2020: COVID-19
March 01, 2020: Composable Surveys with Angular 9
February 20, 2020: Accessing the Elsevier Article Retrieval API from .NET
February 15, 2020: Visualizing the COVID-19 dataset using Microsoft Excel 3D Maps
February 15, 2020: PgBulkInsert: Writing data using a SimpleRowWriter
February 15, 2020: Parsing the COVID-19 Data with C#
January 25, 2020: Using XML Maps for exporting XML Data from Excel

2019

December 31, 2019: Using Dgraph for Aviation Data: Create, Import and Query a Dataset
December 13, 2019: Using Apache Jena for Aviation Data: Create, Import and Query a Dataset
November 11, 2019: Project: Family 👨‍👩‍👧‍👧
September 29, 2019: TinyDgraphClient: A Dgraph Client for .NET
May 18, 2019: Linear Interpolation with InfluxDB
May 04, 2019: Linear Interpolation with PostgreSQL
March 09, 2019: Timeseries Databases Part 5: Generating Ridgeline Plots with R
March 03, 2019: Timeseries Databases Part 4: Generating Choropleth Maps with TimescaleDB and R
February 17, 2019: Scheduling Messages with Quartz.NET
February 10, 2019: Timeseries Databases Part 3: Writing Data to TimescaleDB from .NET
February 10, 2019: Timeseries Databases Part 2: Writing Data to InfluxDB from .NET
February 10, 2019: Timeseries Databases Part 1: Parsing a Dataset with .NET

2018

October 21, 2018: Visualizing Graphs with Edge Constraints of the SQL Server 2019 Graph Database (SQL Server 2019 CTP 2.0)
August 19, 2018: Building Modular Applications with Entity Framework Core 2.1
May 21, 2018: Getting Started with FcmSharp and Firebase Cloud Messaging
May 20, 2018: SQL Server Bulk Inserts from Java
May 11, 2018: Creating OAuth 2.0 Tokens for Firebase Services
May 05, 2018: Streaming Bulk Inserts to SQL Server with SqlServerBulkInsert
May 02, 2018: Analyzing Flight Data with the SQL Server 2017 Graph Database
May 01, 2018: Learning Neo4j at Scale: The Airline On Time Performance Dataset
April 29, 2018: Neo4j with .NET
April 22, 2018: Firebase Cloud Messaging (FCM) with .NET
March 10, 2018: Dropping Disqus and using GitHub for Discussions
January 07, 2018: Real-time Charts with ASP.NET Core SignalR and Chart.js
January 01, 2018: Airline On-Time Performance

2017

December 17, 2017: Generating Choropleth Maps in R
November 18, 2017: Anomaly Detection with SQL and R
October 21, 2017: Providing a File Upload API with Jersey
October 17, 2017: Versioning and Auditing with Hibernate Envers
September 17, 2017: Reactive Programming: Periodically emitting Events with RxJava2

2016

November 19, 2016: Firebase Cloud Messaging (FCM) with Java
August 13, 2016: Creating and Updating GitHub Pages
July 24, 2016: Migrating a library to .NET Core
July 19, 2016: Installing .NET Core on Mac OS X
July 10, 2016: Building Applications with Apache Flink (Part 5): Complex Event Processing with Apache Flink
July 03, 2016: Building Applications with Apache Flink (Part 4): Writing and Using a custom PostgreSQL SinkFunction
July 03, 2016: Building Applications with Apache Flink (Part 3): Stream Processing with the DataStream API
July 03, 2016: Building Applications with Apache Flink (Part 2): Writing a custom SourceFunction for the CSV Data
July 03, 2016: Building Applications with Apache Flink (Part 1): Dataset, Data Preparation and Building a Model
June 19, 2016: Working with a BulkProcessor in PgBulkInsert
June 10, 2016: Stream Data Processing with Apache Flink
May 16, 2016: Working with Elasticsearch in Java
April 15, 2016: Working with Elasticsearch in .NET
February 23, 2016: A Spliterator for MatchResults in Java
February 15, 2016: Simplified Java Database Access with SqlMapper
February 15, 2016: Implementing a Spliterator for a JDBC ResultSet
February 15, 2016: Releasing Java libraries to the Central Repository
February 04, 2016: Building Import Pipelines with JTinyCsvParser and PgBulkInsert
February 04, 2016: PostgreSQL Bulk Inserts with Java
January 15, 2016: Introducing JSimpleMapper
January 15, 2016: Mono on Ubuntu 14.04
January 09, 2016: Performance problem with Files.lines for a Parallel Stream (JDK 1.8)
January 08, 2016: JTinyCsvParser
January 03, 2016: TinyCsvParser Documentation
January 01, 2016: Using a Tokenizer in TinyCsvParser

2015

December 11, 2015: TinySqlMapper
November 14, 2015: Android CardView and RecyclerView Example
November 08, 2015: Custom JSON Serializer and JSON Deserializer for RestSharp
November 08, 2015: Create delegates for Constructors, Property Getters and Property Setters by Compiling Expression Trees in C#
November 07, 2015: Serializing and Deserializing Enumerations with Json.NET
October 24, 2015: PostgreSQL Bulk Insert with C#
September 25, 2015: PostgreSQL and TinyCsvParser
September 19, 2015: Benchmarking TinyCsvParser
September 15, 2015: Using TinyCsvParser and FluentValidation
September 12, 2015: TinyCsvParser - Parsing CSV Data with C#
August 16, 2015: File Uploads with Nancy
May 24, 2015: NPoco with PostgreSQL
April 19, 2015: Consistent Error Handling with Nancy
March 27, 2015: DataContractJsonSerializer: Serializing and Deserializing enum values by their name
March 08, 2015: JSON Generation with PostgreSQL

2014

December 21, 2014: First steps with SQLAlchemy
August 16, 2014: Implementing a Face Recognition Web service
August 02, 2014: Face Detection with the Android API

2013

June 17, 2013: Face Recognition in Videos (or turning videofacerec.py into something useful)
April 27, 2013: Getting a Huawei E352s-5 to work with Linux
March 13, 2013: Website Update

2012

September 08, 2012: Validating Algorithms
June 26, 2012: OpenCV FaceRecognizer documentation
June 03, 2012: Fisherfaces
May 26, 2012: Extracting Contours with OpenCV
April 19, 2012: OpenCV, Microsoft Visual Studio and libfacerec
April 10, 2012: Aligning face images

2011

November 25, 2011: Colormaps in OpenCV
November 15, 2011: Skin Color Thresholding with OpenCV
November 12, 2011: Fisherfaces in OpenCV
November 08, 2011: Local Binary Patterns
October 28, 2011: OpenCV Code Snippets
October 09, 2011: Face Recognition with Python/GNU Octave/Matlab
October 09, 2011: Linear Discriminant Analysis with OpenCV
October 09, 2011: NumPy Performance
October 01, 2011: Principal Component Analysis and Linear Discriminant Analysis with GNU Octave
September 01, 2011: Using libsvm
August 17, 2011: Gender Classification with the Fisherfaces algorithm
July 11, 2011: Eigenfaces
June 01, 2011: How to secure your workstation with iptables
April 20, 2011: PCA in OpenCV

2010

November 21, 2010: Detect a face with OpenCV
August 11, 2010: Erlang autocompletion in vim
August 09, 2010: Longest Common Subsequence
August 04, 2010: Dynamic Time Warping
July 15, 2010: How To Track Your Time
July 15, 2010: Eigenvalues in OpenCV
May 25, 2010: Machine Learning with OpenCV
February 10, 2010: Brutally short introduction to Erlang
February 08, 2010: Android Snippets