Category Archives: Development
Who says developing MariaDB plugins is hard? I was able to produce one in under 3 minutes!
I of course did it by asking Grok nicely:
The produced result is actually very decent:
/*
errorwatch.c – MariaDB Audit API plugin
Records statement execution errors into a dedicated log file.
This plugin subscribes to the GENERAL audit class and logs
events of type MYSQL_AUDIT_GENERAL_ERROR (and STATUS events
that carry a non-zero error code). It writes structured
entries to /var/log/mariadb/errorwatch.log (or /tmp/ fallback).
To build (inside MariaDB source tree):
1. Copy this file and CMakeLists.txt to plugin/errorwatch/
2. …
Continue reading “Vibe-coding an Audit Plugin in Under 3 Minutes”
If you ever considered contributing code to the MariaDB server, you should know that this is an intricate process involving multiple steps and multiple actors. To help you see your contributions successfully merged into the MariaDB Server codebase I’ve compiled a comprehensive description of the contribution process itself, the roles involved into it, the sequence of actions and conditions for transition from one to another. There’s even a diagram!
Please go to COMMUNITY_CONTRIBUTIONS.md.
This of course is going to be a moving target! I fully intend to keep the document up to date and enhance it with clarifications and process changes as they happen.
…
Continue reading “Documented: The MariaDB Server (Community) Contribution Process”
One of the corner stones in MariaDB Foundation’s mission is:
We strive to increase adoption by users and across use cases, platforms and means of deployment.
MariaDB Server plugins are definitely a prime “means of deployment” for server features. But a relatively neglected one so far. They have been around for many years. But, somehow, they have escaped the user’s focus. Why that happened is a very interesting topic. And one that I’d definitely like to hear your opinion on!
Which brings me to my main topic: How do we all change that?
…
We are concluding our series related to new data types using the Type_handler framework, with some limitations that are not yet covered by the framework:
- No custom indexing methods. A plugin type cannot introduce a new indexing method.
- No custom hashing. Plugin types can’t provide their own function for hash-based operations. Things like MEMORY table indexes, GROUP BY, and partitioning fall back to the underlying type’s hash.
- No new field attributes. Plugin types cannot define custom attributes beyond the existing ones: length, precision, scale, and GIS SRID.
…
Continue reading “Adding a New Data Type to MariaDB with Type_handler – Part 5”
This is part 4 of a series related to extending MariaDB with a custom data type using the Type_handler framework.
You can find the previous articles below:
- Adding a New Data Type to MariaDB with Type_handler – Part 0 – how to build MariaDB Server
- Adding a New Data Type to MariaDB with Type_handler – Part 1 – understanding the framework
- Adding a New Data Type to MariaDB with Type_handler – Part 2 – minimal working data type
- Adding a New Data Type to MariaDB with Type_handler – Part 3 – data type output transformation
Overriding Existing Types
In the previous examples, our MONEY data type inherits from DOUBLE and then we override some methods.
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Continue reading “Adding a New Data Type to MariaDB with Type_handler – Part 4”
In the previous article, we wrote, compiled, and tested our first custom data type for MariaDB using the Type_handler framework.
But currently, aside from allowing the use of its new name (MONEY) and listing it in the metadata, our new data type behaves exactly like a DOUBLE, the class it inherits from.
In this article, we will extend our data type just a bit by transforming the result into a VARCHAR and adding a currency sign to it: the dollar sign ($).
This is the expected result:
MariaDB [test]insert into t1 (amount) values (41578.4); …
Continue reading “Adding a New Data Type to MariaDB with Type_handler – Part 3”
After having discovered the Type_hander framework and learned how to build MariaDB Server from source, it’s time to code our first data type!
We will create a MariaDB plugin that registers a new MONEY type and instantiates a custom field object.
Our component won’t be exciting, but we want to understand how to use the framework and test it.
We want to prove that
- the plugin loads,
- the server sees the type hander,
- a MONEY column can create a Field_money object.
Everything else comes later.
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Continue reading “Adding a New Data Type to MariaDB with Type_handler – Part 2”
This is the first part of the series about how to add a new data type to MariaDB using the Type_handler framework. A preliminary article has already been published to start the series; it covers how to set up your development environment and compile MariaDB Server: Adding a New Data Type to MariaDB with Type_handler – Part 0.
Understand Type_handler Before Writing Code
When you add a new type to MariaDB, you are not only adding a new SQL keyword. Historically, that kind of work required invasive changes across the parser, optimizer, protocol, replication, and type-conversion mechanisms.
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Continue reading “Adding a New Data Type to MariaDB with Type_handler – Part 1”