Articles

I Love Xbase++ (ILX)
The portal for Xbase++ developers - under setup, to be launched in 2022
Steffen F. Pirsig
3 min read
Views
430
Introduction Interfaces in Object-Oriented Programming (OOP) play a critical role in designing robust software. In the following we will try to explain the benefits of using interfaces and how to implement them in Xbase++. Generally, benefits of using interface are: Abstraction: Interfaces...
Anna Hristova
3 min read
Views
199
In this article we will have a deeper look into how to implement different types of REST APIs using Xbase++ 2.0. We assume that a user management REST API exposes two endpoints.: 1. "POST /users" - This creates a new user. For this request, we need to send user data in the request body. The API...
Anna Hristova
2 min read
Views
190
Let's start and create an example where we'll retrieve posts from a public REST API, such as JSONPlaceholder which is a free online REST API that you can use for demonstration and testing purposes. Here's the URL endpoint to retrieve posts: https://jsonplaceholder.typicode.com/posts Now, let's...
Andreas Herdt
3 min read
Views
194
Background The SQL command ALTER TABLE can be used to modify the structure of an ISAM emulated SQL table on the PostgreSQL server. However, in order to preserve the ISAM emulation characteristic, some details have to be taken into account which are described in this article. This article does...
Andreas Herdt
4 min read
Views
179
Overview In this article it is shown how the class AesCrypt() can be specialized to implement some padding schemes for encrypting and decrypting messages. Background The Advanced Encryption Standard (AES) standard is a block cipher algorithm that only allows for the encryption of messages in the...
Till Warweg
4 min read
Views
270
The Asset Manager integrated into the Xbase++ Workbench provides an easy interface for viewing, (de-) installing and updating the assets being used in your projects. Behind the scene, the Asset Manager in conjunction with the Workbench, performs the following tasks for you: Manage asset...
Andreas Herdt
7 min read
Views
440
Positioning If a Smtp or Pop3 endpoint for e-mail exchange requests authorization via the OAuth 2.0 protocol, then this flow-based protocol must be used when communicating with the server to authenticating the client. This may also require displaying a user interface for obtaining the user's...
Steffen F. Pirsig
4 min read
Views
337
Background One of the largest differences in how data is managed between SQL and ISAM is how deleted records are handled. In short: ISAM: does mark a record as deleted. This way it is out of scope. To really get rid of the record you need to do a time consuming PACK operation. SQL: does really...
Till Warweg
2 min read
Views
574
Using native SQL for manipulating data as well as structure (schema) of ISAM-emulated tables is a supported scenario, for example, for being able to share data with non-Xbase++ applications. In the following, the potential pitfalls and general requirements are discussed which must be put into...
Jeffrey Wulf
1 min read
Views
398
Background Generally making a service more reliable does not mean to ensure the service works 24/7. This is an old school no more working approach from times where software solutions have been simple, working in defined environments and under full control. But today, even simple software become...
Till Warweg
1 min read
Views
309
Background The PGDBE automatically tracks record locks in ISAM-emulated tables, which are set by clients connected to the PostgreSQL server. This is done with the help of the __lock_owner field in the table's meta data. However, when a client dies unexpectantly, has it's network go down or does...
Steffen F. Pirsig
2 min read
Views
436
Background Since the ISAM emulating tables of the PostgreSQL DatabaseEngine are in fact regular SQL tables, it is possible to manipulate them using SQL statements. However, some SQL operations are problematic, as they may lead to inconsistent/incorrect ISAM behavior. In the following, we will...
  • Featured
Steffen F. Pirsig
2 min read
Views
309
Background As you may have already realized, a PostgreSQL server or any SQL server in general is a "relatively" complicated story. The reason for that is basically that the server with the planner tries to replace you as a human. In ISAM you have the data model in mind, also the requirements of...
Andreas Herdt
1 min read
Views
265
Overview By default, the target (.dll or .exe) is created in the directory as implied in the target node of the project file (.xpj). The target [example.exe] is created in the directory where the project file is located. The target [bin\example.dll], on the other hand, is created in the...
  • Featured
Jeffrey Wulf
5 min read
Views
488
Comments for Xbase++ 1.9 users 1. Support for projects with targets in multiple directories Beginning with Xbase++ version 2.0, complex project scenarios involving targets located in different directories are fully supported. This required changes in the way the targets and the source files...
Steffen F. Pirsig
3 min read
Views
649
Reaction score
2
Background The Xbase++ PostgreSQL DatabaseEngine provides two different access method to data. First, the ISAM emulating approach which works with dedicated SQL tables only. These SQL tables need to be created using ISAM commands like DbCreate/INDEX ON/OrdCreate or have been upsized from...
Till Warweg
3 min read
Views
724
Reg-free COM allows using a copy-deployment for applications depending on COM/ActiveX component. As the name implies, Reg-free COM means there's no need to register COM/ActiveX components prior to using them. To achieve this, the application requires one or more manifest files which describe the...
Jeffrey Wulf
3 min read
Views
281
Xbase++ provides INIT procedures, a concepts which allows by a simple declaration of INIT before the procedure keyword to ensure that this procedure is executed before your procedure main is executed. An example is shown below. INIT PROCEDURE startupMyModule() // your code is RETURN...
Till Warweg
2 min read
Views
329
Background Sometimes, an application may exhibit symptoms which are hard to understand without having information about the internal state, the workflow and timing of operations. This was not an issue with desktop applications as these basically follow the action->reaction principle. Anybody who...
Till Warweg
3 min read
Views
195
Background The Update Manager in the Xbase++ Workbench usually provides a seamless update experience; after clicking "Download and Install", the update process usually runs through without further user interaction. However like all processes, it can fail. This article provides some background...