如何对多个ID使用Dapper.FluentMap.Dommel.Mapping [英] How to use Dapper.FluentMap.Dommel.Mapping for multiple Ids
问题描述
使用Dapper.FluentMap.Dommel.Mapping
时遇到问题.当我记录映射时,系统会识别出名称ID为ID的属性已经存在,并引发异常.但是映射的ID属于另一个对象.我该如何解决这个问题?
I'm having a problem using Dapper.FluentMap.Dommel.Mapping
. When I log the mapping, the system identifies that a property with the name ID already exists and throws the exception. But mapped Id belongs to another object. How can I solve this problem?
BaseEntity.cs
BaseEntity.cs
public abstract class BaseEntity
{
public virtual long Id { get; set; }
}
Sistema.cs
Sistema.cs
public class Sistema : BaseEntity
{
public override long Id { get; set; }
public string Nome { get; set; }
}
Arquivo.cs
Arquivo.cs
public class Arquivo : BaseEntity
{
public override long Id { get; set; }
public Sistema Sistema { get; set; }
public Banco Banco { get; set; }
public List<Error> Erros { get; set; }
public string FullPath { get; set; }
public DateTime DtProcessamento { get; set; }
public int QtRegistros { get; set; }
public Decimal VlTotal { get; set; }
public int Sequencial { get; set; }
public bool isValid { get; set; }
public TipoComunicacao tipoComunicacao { get; set; }
}
ArquivoMap.cs
ArquivoMap.cs
public class ArquivoMap : DommelEntityMap<Entities.Arquivo>
{
public ArquivoMap()
{
ToTable("Arquivo");
Map(a => a.Id).ToColumn("arqu_id").IsKey();
this.Map(a => a.Sistema.Id).ToColumn("sist_id"); //<-- Problm (1)
this.Map(a => a.Banco.Id).ToColumn("banc_id");
//this.Map(a => a.Erros).ToColumn("erro_id"); //
this.Map(a => a.FullPath).ToColumn("arqu_nm_fullPath");
this.Map(a => a.DtProcessamento).ToColumn("arqu_dt_processamento");
this.Map(a => a.QtRegistros).ToColumn("arqu_qt_registros");
this.Map(a => a.VlTotal).ToColumn("arqu_vl_total");
this.Map(a => a.Sequencial).ToColumn("arqu_id_sequencial");
this.Map(a => a.isValid).ToColumn("arqu_bt_valid");
this.Map(a => a.tipoComunicacao).ToColumn("arqu_cd_comunicacao");
}
}
RegisterMappings.cs
RegisterMappings.cs
public static void Register()
{
FluentMapper.Initialize(config =>
{
config.AddMap(new ArquivoMap()); //<-- Call to map
config.AddMap(new BancoMap());
config.AddMap(new ErrorMap());
config.AddMap(new SistemaMap());
config.ForDommel();
});
}
错误:
System.Exception:'检测到重复的映射.属性"Id"已经映射到列"Id".
System.Exception: 'Duplicate mapping detected. Property 'Id' is already mapped to column 'Id'.'
推荐答案
您需要分别映射每个类,首先需要忽略ArquivoMap类中Sistema的属性:
You need to map each class separate, first you need to ignore the property of Sistema in your ArquivoMap class:
this.Map(a => a.Sistema).Ignore();
然后使用Sistema类的地图创建一个单独的类:
Then create a separate class with the map for Sistema class:
public class SistemaMap : DommelEntityMap<Entities.Sistema>{
public SistemaMap()
{
ToTable("Sistema");
this.Map(a => a.Id).ToColumn("sist_id");
}
}
对类的每个子对象执行此操作.然后,要进行查询,您需要执行"MultiQuery-映射"以从数据库中获取映射的对象:
Do it with every sub object of the class. Then to make the query you need to do a MultiQuery - Mapping to get the object mapped from the database:
var arquivoList= yourConnection.Query<Arquivo,Sistema, Arquivo>(sqlQuery,
(arquivo, sistema)=>{
arquivo.Sistema= sistema;
return arquivo;
});
return arquivoList;
在此链接中检查有关如何进行多重查询的详细信息: http://dapper-tutorial. net/result-multi-mapping
Check the details how to do multiquery in this link:http://dapper-tutorial.net/result-multi-mapping
如果查询中有联接,则可能需要使用splitOn属性.在这篇文章中,很好地解释了如何做到这一点: 在Dapper中正确使用多重映射
If you have a join in your query maybe you need to use the splitOn property. In this post explaint very well how to do it: Correct use of Multimapping in Dapper
我希望这会有所帮助.
I hope this can help.
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