Dapper complex mapping Dapper.Extensions Dapper.FluentMap

c# dapper dapper-extensions dapper-fluentmap

Question

I have a bit of a problem with my code and getting dapper to play nicely with it.

When I say my code it was inherited, so this is not my design.

I am trying to replace Entity Framework as the calls to the database are less than efficient so I wanted to be more in control of the SQL produced so Dapper seemed like the obvious choice.

The issue I am having is that I am struggling to map the poco classes I have to the dapper multi query.

The issue I have is as follows:

    public Feed GetFeedDapper(int feedId)
        {
            Feed feed = null;

            var sql =
            @"
            SELECT * FROM Feeds WHERE FeedId= @FeedId
            SELECT * FROM FeedFilterParameters WHERE FeedId = @FeedId
            SELECT * FROM TeamFeeds WHERE FeedId = @FeedId";

            using (var multi = DbConnection.QueryMultiple(sql, new { FeedId = feedId }))
            {
                feed = multi.Read<Feed>().Single();
                feed.Parameters = multi.Read<FeedFilterParameter>().ToList();
                feed.TeamFeeds = multi.Read<TeamFeed>().ToList();
            } 

            return feed;
        }

This is getting me the correct results from the database, which is fine, the issue is that not all properties on the Feed object are being mapped. The feed has a property called InboundProperties that is of type InboundProperties as shown below, and in the database they are stored as InboundProperties_{PropName}. These properties are not being mapped and nothing I try in DapperExtensions or FluentMap are working.

public class InboundProperties
{
    public string ExternalRef { get; set; }
    public string ExternalRefPrevious { get; set; }
    public string ExternalId { get; set; }
    public string ExternalName { get; set; }
    public string ExternalToken { get; set; }
    public int ExternalAPICounts { get; set; }
    public string ExternalLink { get; set; }
    public string ExternalPicture { get; set; }
    public string LastProcessedMessageId { get; set; }
    public long? LastProcessedMessageTime { get; set; }
    public DateTime? MessageCountStartDT { get; set; }
    public Int32 TenancyId { get; set; }
    public virtual int FeedScopeInt { get; set; }
}

Can anyone help me map these properties??

Accepted Answer

Have you tried sth like that:

Feed feed = null;

var sql =
@"
SELECT * FROM Feeds WHERE FeedId= @FeedId
SELECT InboundProperties_ExternalRef as ExternalRef, InboundProperties_ExternalRefPrevious as ExternalRefPrevious FROM Feeds as InboundProperties WHERE FeedId= @FeedId
SELECT * FROM FeedFilterParameters WHERE FeedId = @FeedId
SELECT * FROM TeamFeeds WHERE FeedId = @FeedId";

using (var multi = DbConnection.QueryMultiple(sql, new { FeedId = feedId }))
{
    feed = multi.Read<Feed>().Single();
    feed.InboundProperties = multi.Read<InboundProperties>().Single();
    feed.Parameters = multi.Read<FeedFilterParameter>().ToList();
    feed.TeamFeeds = multi.Read<TeamFeed>().ToList();
} 

return feed;

I mapped only 2 first properties, but if it works you will know how to map all properties.


Popular Answer

This is how I solved it, but accepted #rraszewski answer as it also works, but just means I need to take care of all the selects in a very manual way.

public Feed GetFeedDapper(int feedId)
{
    Feed feed = null;

    var multiPredicate = new GetMultiplePredicate();
    multiPredicate.Add<Feed>(Predicates.Field<Feed>(x => x.FeedId, Operator.Eq, feedId));
    multiPredicate.Add<InboundProperties>(Predicates.Field<InboundProperties>(x => x.FeedId, Operator.Eq, feedId));
    multiPredicate.Add<OutboundProperties>(Predicates.Field<OutboundProperties>(x => x.FeedId, Operator.Eq, feedId));
    multiPredicate.Add<FeedFilterParameter>(Predicates.Field<FeedFilterParameter>(x => x.FeedId, Operator.Eq, feedId));
    multiPredicate.Add<TeamFeed>(Predicates.Field<TeamFeed>(x => x.FeedId, Operator.Eq, feedId));

    var result = DbConnection.GetMultiple(multiPredicate);

    feed = result.Read<Feed>().Single();
    feed.InboundProperties = result.Read<InboundProperties>().Single();
    feed.OutboundProperties = result.Read<OutboundProperties>().Single();
    feed.Parameters = result.Read<FeedFilterParameter>().ToList();
    feed.TeamFeeds = result.Read<TeamFeed>().ToList();

    return feed;
}

Then I map the classes:

public class FeedMapper : ClassMapper<Feed>
{
    public FeedMapper()
    {
        base.Table("Feeds");
        Map(f => f.FeedId).Key(KeyType.Identity);

        Map(f => f.Owner).Ignore();
        Map(f => f.TeamFeeds).Ignore();
        Map(f => f.FeedDirection).Ignore();
        Map(f => f.InboundProperties).Ignore();
        Map(f => f.Parameters).Ignore();
        Map(f => f.OutboundProperties).Ignore();
        Map(f => f.RelatedTeams).Ignore();

        AutoMap();
    }
}

public class InboundPropertiesMapper : ClassMapper<InboundProperties>
{
    public InboundPropertiesMapper()
    {
        base.Table("Feeds");
        Map(f => f.FeedId).Key(KeyType.Identity);

        Map(f => f.Channel).Ignore();
        Map(f => f.FeedScope).Ignore();

        Map(f => f.ChannelInt).Column("InboundProperties_ChannelInt");
        Map(f => f.ExternalAPICounts).Column("InboundProperties_ExternalAPICounts");
        Map(f => f.ExternalId).Column("InboundProperties_ExternalId");
        Map(f => f.ExternalLink).Column("InboundProperties_ExternalLink");
        Map(f => f.ExternalName).Column("InboundProperties_ExternalName");
        Map(f => f.ExternalPicture).Column("InboundProperties_ExternalPicture");
        Map(f => f.ExternalRef).Column("InboundProperties_ExternalRef");
        Map(f => f.ExternalRefPrevious).Column("InboundProperties_ExternalRefPrevious");
        Map(f => f.ExternalToken).Column("InboundProperties_ExternalToken");
        Map(f => f.FeedScopeInt).Column("InboundProperties_FeedScopeInt");
        Map(f => f.LastProcessedMessageId).Column("InboundProperties_LastProcessedMessageId");
        Map(f => f.LastProcessedMessageTime).Column("InboundProperties_LastProcessedMessageTime");
        Map(f => f.MessageCountStartDT).Column("InboundProperties_MessageCountStartDT");
        Map(f => f.TenancyId).Column("InboundProperties_TenancyId");
        AutoMap();
    }
}

public class OutboundPropertiesMapper : ClassMapper<OutboundProperties>
{
    public OutboundPropertiesMapper()
    {
        base.Table("Feeds");
        Map(f => f.FeedId).Key(KeyType.Identity);

        Map(f => f.Channel).Ignore();
        Map(f => f.FeedType).Ignore();

        Map(f => f.OutboundFeedTypeInt).Column("OutboundProperties_OutboundFeedTypeInt");
        Map(f => f.TenancyId).Column("OutboundProperties_TenancyId");
        AutoMap();
    }
}


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Licensed under: CC-BY-SA with attribution
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Is this KB legal? Yes, learn why