DP44/enriched-qwen3-coder-next/DataPRO/DbAPI/Errors.md

source_files, generated_at, model, schema_version, sha256

source_files	generated_at	model	schema_version	sha256
DataPRO/DbAPI/Errors/ErrorCodes.cs	2026-04-16T04:26:28.421504+00:00	Qwen/Qwen3-Coder-Next-FP8	1	0b2f1f90c61e6679

Errors

1. Purpose

This module defines a centralized set of error codes and a string conversion utility for the DbAPI layer of the proprietary codebase. It serves as a canonical source of error constants (e.g., ERROR_ACCESS_DENIED, INVALID_SESSIONID) used throughout database-related operations, enabling consistent error reporting and handling. The ResultToString method maps numeric error codes to human-readable string representations, facilitating debugging and logging.

2. Public Interface

• public const ulong ERROR_SUCCESS = 0x0
  Indicates successful operation.
• public const ulong ERROR_INVALID_FUNCTION = 0x1
  Generic error for an invalid or unsupported function call.
• public const ulong ERROR_FILE_NOT_FOUND = 0x2
  Indicates a requested file could not be located.
• public const ulong ERROR_PATH_NOT_FOUND = 0x3
  Indicates a requested path (directory) could not be located.
• public const ulong ERROR_ACCESS_DENIED = 0x5
  Indicates insufficient permissions to perform the requested operation.
• public const ulong ERROR_NOT_SUPPORTED = 0x32
  Indicates the requested operation is not supported.
• public const ulong INVALID_SESSIONID = 0x200
  Indicates an invalid or expired session identifier was provided.
• public const ulong ERROR_UNKNOWN = 0x201
  Fallback error code for unrecognized or unclassified errors.
• public const ulong ERROR_NOUSER = 0x202
  Indicates no user context is available (e.g., unauthenticated or deleted user).
• public const ulong ERROR_LOGINFAILED = 0x203
  Indicates authentication failure (e.g., invalid credentials).
• public const ulong ERROR_MISSING_PARAMETER = 0x204
  Indicates a required parameter was omitted in a function call.
• public static string ResultToString(ulong hr)
  Converts a numeric error code (hr) to a descriptive string (e.g., "ACCESS_DENIED"). For unrecognized codes, returns the hex representation (e.g., "205" for 0x205).

3. Invariants

• All error codes are const ulong and assigned explicit hexadecimal values.
• ResultToString is deterministic: the same input hr always produces the same output string.
• The switch statement in ResultToString is exhaustive for all defined constants; any value not explicitly handled falls back to hex formatting.
• No mutable state exists in this class (it is abstract and contains only constants and a static method).

4. Dependencies

• Internal dependencies: None (no external references in the provided source).
• Consumers: This module is expected to be referenced by other components in the DbAPI layer (e.g., database connection, query execution, or session management modules) to standardize error reporting.
• No external libraries or frameworks are imported or referenced in this file.

5. Gotchas

• The abstract modifier on ErrorCodes is unusual for a pure constants class (typically static class is used in C# for this pattern); this may imply intentional extensibility (e.g., subclassing for environment-specific codes), but no subclasses are present in the provided source.
• The default case in ResultToString returns hr.ToString("X"), which omits the 0x prefix (e.g., "205" instead of "0x205"), potentially reducing clarity in logs.
• The constant ERROR_LOGINFAILED uses a string literal "LOGIN_FAILED" instead of @"LOGIN_FAILED" (consistent verbatim string usage elsewhere suggests this may be unintentional).
• No error codes between 0x205 and 0x201 (e.g., 0x205–0x201 is invalid range; likely meant 0x205–0x209) are defined, suggesting possible gaps or future expansion points.
• None identified from source alone.