Discussing the article: "Database Is Easy (Part 1): A Lightweight ORM Framework for MQL5 Using SQLite"
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Check out the new article: Database Is Easy (Part 1): A Lightweight ORM Framework for MQL5 Using SQLite.
This article presents a structured way to manage SQLite data in MQL5 through an ORM layer for MetaTrader 5. It introduces core classes for entity modeling and database access, a fluent CRUD API, reflection hooks for OnGet/OnSet, and macros to define models quickly. Practical code shows creating tables, binding fields, inserting, updating, querying, and deleting records. Developers gain reusable, type-safe components that minimize repetitive SQL.
In the world of algorithmic trading, robust data management is crucial. MQL5 provides a low-level database API for SQLite, which is powerful but requires manual SQL handling. Unlike modern languages such as C# that offer ORM solutions like ADO.NET or Entity Framework, MQL5 currently lacks a reusable and production-ready ORM framework. This article introduces a comprehensive, lightweight, portable, and professional ORM framework SQLite ORM(Object-Relational Mapping) system for MQL5 that brings SQL query capabilities to MetaTrader 5, designed specifically for SQLite.
Unlike traditional SQL approaches, this system provides a fluent interface that makes database operations intuitive and maintainable. At first it may seem tedious or difficult, but by developing a database management system, it makes the work easier, and we get rid of the long and tedious commands.
Well, in this regard, we will go step by step to implement this database management system in the style of ORM (Object Relational Mapping), which makes it easy for us to work with the database. In theory, no need to copy and paste every time the basic MQL5 SQL functions such as DatabaseOpen/DatabaseClose/DatabasePrepare/DatabaseFinalize/... everywhere in the code. Thus, in this case we need a framework that collects all useful methods to do the work in a plain way to delegate the data between database and our desired variables smoothly. Then in practical section, we implement our own model that reflects the data delegation between our desired variables and database file via ORM class object. At last we are testing the implemented classes in every section to check the results we expect from the framework. At the end of the article, there are the framework module and testing files to integrate it to any project that developer needs. At the time of writing, no similar ORM framework exists in the MQL5 Articles section. Is the first of its kind for MQL5. To implement this framework, we will start step by step.
Author: Hans Alexander Nolawon Djurberg