---
source_files:
  - Common/DTS.Common.Storage/Classes/NoDBAccessException.cs
  - Common/DTS.Common.Storage/Classes/DigitalInputSettings.cs
  - Common/DTS.Common.Storage/Classes/DbTypeAttr.cs
  - Common/DTS.Common.Storage/Classes/DAS.cs
  - Common/DTS.Common.Storage/Classes/MMETables.cs
generated_at: "2026-04-17T15:35:29.267198+00:00"
model: "zai-org/GLM-5-FP8"
schema_version: 1
sha256: "c24664278ad7693a"
---

# DTS.Common.Storage Module Documentation

## 1. Purpose

This module provides data transfer objects, constants, and metadata definitions for the DTS storage layer. It defines database table schemas through string constants and enum-based field definitions, custom attributes for database type mapping, and a specialized exception for database access failures. The module serves as a central schema reference for persistent storage operations across the DTS system, particularly for Data Acquisition Systems (DAS), Digital Input Settings, and MME (Measurement/Monitoring Equipment) configuration tables.

---

## 2. Public Interface

### NoDBAccessException
```csharp
public class NoDBAccessException : Exception
{
    public NoDBAccessException(Exception ex)
}
```
Wraps an existing exception to indicate a database access failure. Preserves the original exception's message and maintains it as the inner exception.

### DbTypeAttr
```csharp
public class DbTypeAttr : Attribute
{
    public string DbType { get; private set; }
    internal DbTypeAttr(string attr)
    public static string GetDbType(object o)
}
```
An attribute for annotating enum members with database type information. The constructor is `internal`, restricting instantiation to within the assembly. The static `GetDbType(object o)` method uses reflection to retrieve the `DbType` value from an enum member decorated with this attribute; returns `null` if the object is null, has no members, or lacks the attribute.

### DigitalInputSettings
```csharp
public class DigitalInputSettings
{
    public const string Table = "tblDigitalInputSetting";
    public enum Fields { SettingName, SettingMode, ScaleMultiplier, LastModified, LastModifiedBy, SensorId, UserValue1, UserValue2, UserValue3, UserTags }
}
```
Defines the table name and field enumeration for digital input configuration storage.

### DAS
```csharp
public class DAS
{
    public const string Table = "tblDAS";
    public const string TableDASChannels = "tblDASChannels";
    public enum Fields { SerialNumber, Type, MaxModules, MaxMemory, MaxSampleRate, MinSampleRate, FirmwareVersion, CalDate, ProtocolVersion, LastModified, LastModifiedBy, Version, LocalOnly, LastUsed, LastUsedBy, Connection, Channels, Position, ChannelTypes, Reprogramable, Reconfigurable, IsModule }
    public enum DASChannelFields { HardwareId, ChannelIdx, SupportedBridges, SupportedExcitations, DASDisplayOrder, LocalOnly, SupportedDigitalInputModes, SupportedSquibFireModes, SupportedDigitalOutputModes, ModuleSerialNumber, ModuleArrayIndex }
    // 26 prototype constant strings (see Invariants)
}
```
Defines schema for Data Acquisition System hardware and channel configuration. Contains 26 public string constants for prototype hardware identifiers (e.g., `SLICE1_PROTOTYPE`, `G5_VDSPROTOTYPE`, `TDASPRO_8MRack`, etc.).

### MMETables
```csharp
public class MMETables
{
    public const string MyType = "MyType";
    public const string CustomChannelType = "CustomChannelType";
    public const string Id = "Id";
    public const string MMEPossibleChannelsTable = "tblMMEPossibleChannels";
    public const string MMEDirectionsTable = "tblMMEDirections";
    public const string MMEFilterClassesTable = "tblM