Inserting and MultiMapping using Dapper.Contrib

Question

What I am attempting to do, is to be able to use complex objects both for retrieval and for writing back to the database.

For example, I have two classes

[Table("Children")]
public class Child
{
    public int Id { get; set; }
    public int ParentId { get; set; }
    public string Data { get; set; }
}

[Table("Parents")]
public class Parent
{
    public int Id { get; set; }
    public string Data { get; set; }
    public List<Child> Children { get; set; }

    public Parent()
    {
        Children = new List<Child>();
    }
}

I populate the Parent object using the method below

public List<Parent> GetAll()
{
    var parents = new List<Parent>();
    using (SQLiteConnection conn = new SQLiteConnection(sqlConnectionString))
    {
        string sql = $@"
        SELECT * From Parents;
        SELECT * FROM Children;
        ;";

        var results = conn.QueryMultiple(sql);
        parents = results.Read<Parent>().ToList();
        var children = results.Read<Child>();
        foreach (var parent in parents)
        {
            parent.Children = children.Where(a => a.ParentId == parent.Id).ToList();
        }
    }
  return parents;
}

My Question now that I have my populated object, say I want to make changes to Parent including adding/updating/remove values from Parent.Children

This is my first pass at an update method, but I recognize there are issues here, such as making the determination to update or insert based on the child Id being zero or not, as well as this being a bit verbose.

Is there way, and am I missing some functionality of Dapper or Dapper.Contrib that would provide helper methods to make this process easier?

public bool Update(Parent parent)
{
    bool result = true;
    using (SQLiteConnection conn = new SQLiteConnection(sqlConnectionString))
    {
        conn.Open();
        using (var tran = conn.BeginTransaction())
        {
            try
            {
                if (!conn.Update<Parent>(parent))
                {
                    result = false;
                }

                foreach (var element in parent.Children)
                {
                    if (element.Id == default(int))
                    {
                        conn.Insert<Child>(element);
                    }
                    else
                    {
                        if (!conn.Update<Child>(element))
                        {
                            result = false;
                        }
                    }
                }
                tran.Commit();
            }
            catch(Exception ex)
            {
                //logger.Error(ex,"error attempting update");
                tran.Rollback();
                throw;
            }
        }
    }

    return result;
}

Answer 1

Sadly, given how poor the response was to this question, and Dapper.Contrib questions in general. I've decided to dump Dapper and switch to an ORM that better suites my needs. Thanks for all those that offered suggestions.