Aug 22, 2018 · This article provides a quick guide to Databases with SQLITE3 using C++/C. In our examples, we used C++, but when we passed our strings, we called the c_str() method, in order to convert the string in a character array: this proves that all the routines utilised can be utilised in C as well.

The SQL CREATE FUNCTION statement is used to define a new user-defined function (UDF) in a database. A function in SQL is a set of SQL statements that perform a specific task and return a single value.

May 26, 2017 · You could always create a permanent function in tempdb. That function would not be prefixed with ## or # to indicate it's a temporary object. It would persist "permanently" until it's dropped or the server is restarted and tempdb is rebuilt without it.

Jun 29, 2022 · SQLAPI++ is a C++ library (basically a set of header files) for accessing multiple SQL databases (Oracle, SQL Server, DB2, Sybase, Informix, InterBase, SQLBase, MySQL, PostgreSQL, SQLite, SQL Anywhere and ODBC).

May 8, 2009 · exec sql create table x (y integer not null); and arranges for the correct interface calls. Clearly, with input and output variables, this saves some effort - the pre-compiler generates the code to handle lists of variables etc that ODBC etc requires you to code explicitly.

Feb 2, 2023 · In this short series, we're going to add a user defined function to SQLite in C. We'll go through the process slowly and in a way which, I hope, a C novice can follow. It's pretty easy to get setup. The first thing we'll do is download and unzip the complete SQLite source code.

These functions (collectively known as "function creation routines") are used to add SQL functions or aggregates or to redefine the behavior of existing SQL functions or aggregates.

Sep 3, 2024 · Creates a user-defined function (UDF), which is a Transact-SQL or common language runtime (CLR) routine. A user-defined function accepts parameters, performs an action such as a complex calculation, and returns the result of that action as a value. The return value can either be a scalar (single) value or a table.

Mar 16, 2025 · SQLite, unlike many other database systems, doesn't have a built-in mechanism to create or redefine functions directly within SQL queries. However, it offers a powerful C API that allows you to extend its functionality by creating custom functions.

For instance, you could create functions that allow you to read and write from a dictionary. You can declare these functions like so: declare function dict_get_value ( dict object , key_ text not null ) text ;