dapper -multi-mapping: flat sql return to nested objects

问题

I have a company that contains an address object. The SQL return is flat, and I'm tring to get Query<> to load all the objects.

cnn.Query<Company,Mailing,Physical,Company>("Sproc", 
                    (org,mail,phy) =>
                    {
                        org.Mailing = mail;
                        org.Physical = phy;
                        return org;
                    },
                    new { ListOfPartyId = stringList }, null, true, commandTimeout: null,
                    commandType: CommandType.StoredProcedure, splitOn: "MailingId,PhyscialId").ToList();

I'm not sure if i have the SplitOn correct either. I'm getting the message:

When using the multi-mapping APIs ensure you set the splitOn param if you have keys other than Id Parameter name: splitOn

Suggestions would be great.

The examples in the Test.cs are not what the code asks for as parameters for the queries. These need to be updated

回答1:

for me this works perfect ... perhaps a typo?

I see PhyscialId which definitely looks like one.

class Company
{
    public int Id { get; set; }
    public string Name { get; set; }
    public Mailing Mailing { get; set; }
    public Physical Physical { get; set; }
}

class Mailing
{
    public int MailingId { get; set; }
    public string Name { get; set; }
}

class Physical
{
    public int PhysicalId { get; set; }
    public string Name { get; set; }
}

public void TestSOQuestion()
{
    string sql = @"select 1 as Id, 'hi' as Name, 1 as MailingId, 
       'bob' as Name, 2 as PhysicalId, 'bill' as Name";
    var item = connection.Query<Company, Mailing, Physical, Company>(sql,
                (org, mail, phy) =>
                {
                    org.Mailing = mail;
                    org.Physical = phy;
                    return org;
                },
                    splitOn: "MailingId,PhysicalId").First();


    item.Mailing.Name.IsEqualTo("bob");
    item.Physical.Name.IsEqualTo("bill");

}

来源：https://stackoverflow.com/questions/7078478/dapper-multi-mapping-flat-sql-return-to-nested-objects

标签

dapper