Located at
Dahl.Data is a NuGet library that is added to your project to use ADO.NET in a consistent manner.
Inherit Dahl.Data - simple facade for .NET
Release Notes
Located at kdahltx/Dahl.Data
Packages
NuGet Release feed: https://www.nuget.org/
| Package | NuGet Stable | NuGet Pre-release | Downloads | MyGet |
|---|---|---|---|---|
| Dahl.Data |  |
 |
 |
Features
Dahl.Data is a NuGet library that can be added to a project for creating a consistent api to access data.
This facade provides an interface/mechanism to implement customized mapping classes that can be used to optimize performance for an object used a significant number of times. For large result sets it can provide better performance than Dapper because the mapping class does a direct assignment between the data row column and object property.
Of course on needs to remember that creating a direct mapping class requires more work than using an alternative approach.
Execute a query and map the results to a parent/child class
Example usage:
public class Ssn
{
public Guid SsnId { get; set; }
public short Ssn1 { get; set; }
public short Ssn2 { get; set; }
public short Ssn3 { get; set; }
}
public class Users
{
public int UserId { get; set; }
public string FirstName { get; set; }
public string LastName { get; set; }
private Ssn _fk_Ssn;
public Ssn fk_Ssn
{
get { return _fk_Ssn = _fk_Ssn ?? new Ssn(); }
set { _fk_Ssn = value; }
}
public Guid SsnId
{
get { return fk_Ssn.SsnId; }
set { fk_Ssn.SsnId = value; }
}
public short fk_Ssn_Ssn1
{
get { return fk_Ssn.Ssn1; }
set { fk_Ssn.Ssn1 = value; }
}
public short fk_Ssn_Ssn2
{
get { return fk_Ssn.Ssn2; }
set { fk_Ssn.Ssn2 = value; }
}
public short fk_Ssn_Ssn3
{
get { return fk_Ssn.Ssn3; }
set { fk_Ssn.Ssn3 = value; }
}
}
public class UsersMap : Dahl.Data.Common.Mapper<Users>
{
private readonly SsnMap _ssnMap = new SsnMap();
#region Ordinal Variables -----------------------------------------------------------------
private int _ordUserId;
private int _ordFirstName;
private int _ordLastName;
private int _ordSsnId;
#endregion
public override void SetFieldOrdinals( ConcurrentDictionary<string, IFieldInfo> columns )
{
_ordUserId = columns["UserId"].Ordinal;
_ordFirstName = columns["FirstName"].Ordinal;
_ordLastName = columns["LastName"].Ordinal;
_ordSsnId = columns["SsnId"].Ordinal;
_ssnMap.SetFieldOrdinals( columns );
}
public override Users Map( object[] values )
{
Users users = new Users();
users.SsnId = values[_ordSsnId].ToString().ToGuid();
users.UserId = (int)values[_ordUserId];
users.FirstName = (string)values[_ordFirstName];
users.LastName = (string)values[_ordLastName];
users.fk_Ssn = _ssnMap.Map( values );
return users;
}
}
public class SsnMap : Dahl.Data.Common.Mapper<Ssn>
{
#region Ordinal Variables -----------------------------------------------------------------
private int _ordSsnId;
private int _ordSsn1;
private int _ordSsn2;
private int _ordSsn3;
#endregion
/// <summary>
/// called by the base class
/// </summary>
public override void SetFieldOrdinals( ConcurrentDictionary<string, Common.IFieldInfo> cols )
{
_ordSsnId = cols["SsnId"].Ordinal;
_ordSsn1 = cols["Ssn1"].Ordinal;
_ordSsn2 = cols["Ssn2"].Ordinal;
_ordSsn3 = cols["Ssn3"].Ordinal;
}
public override Ssn Map( object[] values )
{
Ssn ssn = new Ssn();
ssn.SsnId = (Guid)values[_ordSsnId];
ssn.Ssn1 = (short)values[_ordSsn1];
ssn.Ssn2 = (byte)values[_ordSsn2];
ssn.Ssn3 = (short)values[_ordSsn3];
return ssn;
}
}
