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https://dev.mysql.com/doc/refman/5.7/en/adding-udf.html
/ Extending MySQL / Adding Functions to MySQL / Adding a User-Defined Function 28.4.2 Adding a User-Defined Function For the UDF mechanism to work, functions must be written in C or C++ and your operating system must support dynamic loading.
https://dev.mysql.com/doc/refman/8.0/en/udf-loading.html
While a UDF is loaded, information about it is available from the Performance Schema user_defined_functions table. See Section 5.7.2, “Obtaining User-Defined Function Information” . CREATE FUNCTION also registers the UDF in the mysql.func system table to cause the server to load it on subsequent restarts.
https://dev.mysql.com/doc/refman/5.5/en/adding-udf.html
This section describes the different functions that you must define to create a simple UDF. For information about the order in which MySQL calls these functions, see User-Defined Function Interface Functions. The main xxx() function should be declared as shown in this section.
https://stackoverflow.com/questions/58357994/are-mysql-user-defined-function-written-in-c-supported-in-azure-mysql-db
Are MySQL User Defined Function written in C(++) supported in Azure MySQL DB? With Azure MySQL DB I refer to the Fully Managed Service (Paas) Version of MySQL on Azure I cannot find this currently on the Limitations list, however I wonder how to make use of this functionality.
https://dev.mysql.com/doc/en/adding-functions.html
See Section 13.7.4.1, “CREATE FUNCTION Syntax for User-Defined Functions”. In some cases, UDFs are included in plugin or component library files and are loaded and unloaded automatically when the plugin or component is installed or uninstalled. By creating native (built-in) MySQL functions.
https://www.mysql.com/support/consultative.html
MySQL Consultative Support service is included in Premier Support. Consultative Support 1 is a proactive approach that is designed to help you avoid critical outages. MySQL Support Engineers advise you on how to properly setup and tune your MySQL servers, schema, queries, and replication set-up to maximize performance and availability.
https://dev.mysql.com/doc/refman/5.5/en/create-function-udf.html
A user-defined function (UDF) is a way to extend MySQL with a new function that works like a native (built-in) MySQL function such as ABS() or CONCAT(). function_name is the name that should be used in SQL statements to invoke the function.
https://www.mysql.com/fr/support/consultative.html
MySQL Consultative Support MySQL Consultative Support service is included in Premier Support. Consultative Support 1 is a proactive approach that is designed to help you avoid critical outages. MySQL Support Engineers advise you on how to properly setup and tune your MySQL servers, schema, queries, and replication set-up to maximize performance and availability.
https://www.codeguru.com/cpp/data/mfc_database/misc/article.php/c12615/MySQL-UDFs.htm
Basically, a User Defined Function (UDF) is a piece of code that extends the functionality of a MySQL server by adding a new function that behaves just like a native (built-in) MySQL function, such as abs() or concat(). UDFs are written in C (or C++ if you really need to).
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