# System.Data

**Kind:** Service

**Source:** `Pams/Logic/Pams.Business/Pams.Business.csproj` (line 1)

**Part of:** [Pams](subsystem-pams)

NuGet package dependency

`System.Data` is a NuGet package dependency declared in `Pams.Business.csproj`. The Pams.Business project references it for .NET data-related types and APIs used by business-layer code.

## Diagram

```mermaid
sequenceDiagram
    participant Business as Pams.Business
    participant Data as System.Data
    participant Store as Data Store

    Business->>Data: Create and manage data objects
    Data->>Store: Read or write data
    Store-->>Data: Return data result
    Data-->>Business: Return data types
```

## Usage

```ts
// JavaScript clients do not import the .NET System.Data package directly.
// Call a Pams.Business-backed API endpoint that reads data through System.Data.

const response = await fetch("/api/pams/accounts", {
  headers: {
    Accept: "application/json",
  },
});

if (!response.ok) {
  throw new Error(`Request failed: ${response.status}`);
}

const accounts = await response.json();
console.log(accounts);
```

## AI Coding Instructions

- Keep the `System.Data` package reference in `Pams.Business.csproj` compatible with the project's target framework.
- Use `System.Data` types only within .NET projects; JavaScript and TypeScript clients must access data through application APIs.
- Check existing Pams.Business data-access patterns before adding new connections, commands, or data readers.
- Dispose database connections, commands, and readers according to the patterns already used in the project.