# Stored Procedures

Stored procedure support is available through `db.Procedures` when `DynamicDatabaseOptions.SupportStoredProcedures` is enabled.

For an in-depth comparison with query syntax styles and advanced return-shape behavior, see [Syntax Deep Dive and Procedure Calls](syntax-and-procedures-deep-dive.md).

## Basic Invocation

```csharp
var scalar = db.Procedures.sp_Exp_Scalar();
var scalarTyped = db.Procedures.sp_Exp_Scalar<int>();
```

## Input, Output, Return Parameters

Prefixes in argument names control parameter direction:

- `out_` for output
- `ret_` for return value
- `both_` for input/output

Example pattern:

```csharp
var res = db.Procedures.sp_Exp_SomeInputAndOutput<
    string,
    MyProcResult>(
        Name: "G4g4r1n",
        out_Result: new DynamicSchemaColumn { Size = 256 },
        ret_Return: 0);
```

## Nested Procedure Names

Dynamic member chaining builds qualified names:

```csharp
var res = db.Procedures.dbo.reporting.MyProc();
```

This resolves to `dbo.reporting.MyProc`.

## Result Mapping

If generic return types are provided, DynamORM attempts mapper-based projection into the target type.

If output parameters are present, result payload is assembled from:

- main scalar/resultset-derived value
- output values
- optional return value

The behavior is implemented in `DynamORM/DynamicProcedureInvoker.cs` and documented in XML examples in `DynamORM/DynamicDatabase.cs`.