Developer Tool · Kurt KluthActive

SQLCLR

A developer resource for SQL Server CLR integration. It covers writing, deploying, and operating .NET assemblies that run inside the database engine. Governed, verifiable, and built to survive security reviews and engine upgrades.

Open sqlclr.com View Documentation

live at sqlclr.com

Key features

What SQLCLR does

Governed extensibility

CLR assemblies with explicit permission sets, signing, and catalog-level trust. This is extensibility your DBAs approve of and your auditors can trace.

Every object type

Scalar functions, streaming table-valued functions, stored procedures, user-defined aggregates, and user-defined types, all as compiled .NET.

Security-first

CLR strict security from day one: signed assemblies, trusted-assembly allowlisting, and no TRUSTWORTHY shortcuts.

Cross-platform

One codebase for SQL Server on Windows, Linux, and Kubernetes. The same assembly deploys identically wherever the engine runs.

Worked examples

Complete C# and T-SQL for regex functions, streaming TVFs, and custom aggregates, with performance notes measured inside the engine.

Troubleshooting from the trenches

The real errors (6263, 10314, 6522) with causes and fixes, learned across twenty-five years at the engine boundary.

Getting started

Up and running in three steps

01
Visit sqlclr.com
The companion site covers the practice: who this is for and the story of the engine boundary.
02
Read the Quick Start
Enable CLR, build a minimal C# function, and call it from T-SQL in about ten minutes.
03
Deploy something real
Work through the examples (a regex scalar function, a streaming TVF, a custom aggregate), then read Security before production.

Technology