ZeroAlloc.ORM.Generator 0.1.0

<h1 align="center">ZeroAlloc.ORM</h1>

<p align="center">Source-generator-based, NativeAOT-clean raw-SQL data access for .NET. Annotate <code>partial</code> methods with <code>[Query]</code> / <code>[Command]</code> / <code>[StoredProcedure]</code>; the generator emits typed parameter binding + materialization against <a href="https://github.com/MarcelRoozekrans/AdoNet.Async">AdoNet.Async</a>. Zero runtime reflection.</p>

Status: Pre-release. v0.1 milestone in progress. Authoritative design lives at docs/design/2026-05-30-v1.0-design.md. Working backlog at docs/plans/za-orm-backlog.md.

What it is

A source-generator-driven data-access library that fills in the gap between two extremes adopters currently choose from:

• EF Core — full LINQ-to-SQL ORM, but its precompile-queries pipeline currently collides with co-resident source generators (e.g. ZA.Rest), blocking NativeAOT publish in template stacks like ZeroAlloc.Templates.
• Hand-written ADO.NET — works under AOT, but every repository becomes a hand-shaped tower of CreateCommand / CreateParameter / ReadAsync calls.

ZeroAlloc.ORM is the middle path: write the SQL string in an attribute, declare the partial method signature, let the source generator emit the ADO.NET pipeline. Zero runtime reflection, fully AOT-publishable, idiomatic with the rest of the ZeroAlloc ecosystem (consumes AdoNet.Async, dogfoods ZeroAlloc.ValueObjects, shares the convention catalog with ZeroAlloc.Mapping).

Packages

Quick Start

Scalar query

using System.Data.Async;
using System.Threading;
using System.Threading.Tasks;
using ZeroAlloc.ORM;

public sealed partial class Repo(IAsyncDbConnection connection)
{
    [Query("SELECT count(*) FROM Orders")]
    public partial Task<int> CountOrdersAsync(CancellationToken ct);
}

The source generator emits the open / execute / close pipeline against AdoNet.Async's IAsyncDbConnection. Zero runtime reflection; the emit composes through global::-qualified identifiers so it doesn't care about the consumer's using directives.

Row materialization (FlatRow)

public sealed record OrderRow(int Id, int CustomerId, decimal Total);

public sealed partial class OrderRepo(IAsyncDbConnection connection)
{
    [Query("SELECT Id, CustomerId, Total FROM Orders WHERE Id = @id")]
    public partial Task<OrderRow?> GetByIdAsync(int id, CancellationToken ct);
}

Positional record + matching SELECT column order = no mapping config. Nullable return = empty result set yields null.

Available in v0.1

• [Query] with scalar (Task<int>, Task<T?>) and FlatRow (Task<TRow?>) return shapes.
• 14 primitive types in parameter binding (int / long / short / byte / bool / decimal / double / float / string / Guid / DateTime / DateTimeOffset / TimeSpan / byte[]) + nullable variants.
• [Param(Name = "...")] SQL-side parameter name override.
• Compile-time diagnostics (ZAO001–ZAO009 + informational ZAO020–ZAO022) for signature contract violations.
• NativeAOT-clean publish (verified by aot-smoke CI gate).

Deferred to later milestones: [Command] / [StoredProcedure] (v0.4), IAsyncEnumerable<T> streaming (v0.3), multi-result-set tuples (v0.3), value-objects + enums (v0.2), composite types (v0.5).

Design + roadmap

• Design: docs/design/2026-05-30-v1.0-design.md — 5-section v1.0 design covering architecture, generator surface, convention discovery, diagnostics, test strategy, milestones.
• Backlog: docs/plans/za-orm-backlog.md — priority-banded task list. New findings during implementation get appended.
• Ecosystem context: sits alongside ZeroAlloc.Mediator, ZeroAlloc.Mapping, ZeroAlloc.ValueObjects, ZeroAlloc.Validation. Substrate is AdoNet.Async (AOT-compatible since v1.x).

License

MIT