在查询上生成错误的列

Question

我们在NHibernate中遇到间歇性问题,它偶尔会在SQL上生成一个错误列的查询.如果我们重新启动应用程序,则问题不再发生(有时需要多次重启).出现问题时,在该进程的生命周期内,它始终会为受影响的实体生成错误的SQL.它并不总是受影响的实体.

这是一个ASP.NET应用程序,其中SessionFactory是在Application_Start事件期间创建的.所有配置和映射都是通过代码完成的.

我们没有更多的想法如何测试或调试应用程序,我开始假设NHibernate中有一些错误,因为应用程序在重新启动时自行修复.任何想法/提示将不胜感激!

这是一个例子:

实体

namespace Example.Clinicas
{
    public partial class Clinica : Entidade   // Abstract base class that has a property Handle
    {
        public virtual string Ddd { get; set; }
        public virtual string Ddd2 { get; set; }
        public virtual long? Duracao { get; set; }
        public virtual string Numero { get; set; }
        public virtual string Numero2 { get; set; }
        public virtual string Prefixo { get; set; }
        public virtual string Prefixo2 { get; set; }
        public virtual long? HandlePrestador { get; set; }
        public virtual Example.Prestadores.Prestador Prestador { get; set; }
    }
}

制图

namespace Example.Clinicas.Mappings
{
    public class ClinicaMapping : ClassMapping<Clinica>
    {
        public ClinicaMapping() 
        {
            Table("CLI_CLINICA");

            Id(x => x.Handle, map => 
            {
                map.Column("HANDLE");
                map.Generator(Generators.Sequence, g => g.Params(new { sequence = "SEQ_AUTO1816" }));
            });
            Property(x => x.Ddd, map => map.Column( c=> 
            {
                c.Name("DDD1");
                c.Length(4);
            }));
            Property(x => x.Ddd2, map => map.Column( c=> 
            {
                c.Name("DDD2");
                c.Length(4);
            }));
            Property(x => x.Duracao, map => map.Column("INTERVALOAGENDA"));
            Property(x => x.Numero, map => map.Column( c=> 
            {
                c.Name("NUMERO1");
                c.Length(5);
            }));
            Property(x => x.Numero2, map => map.Column( c=> 
            {
                c.Name("NUMERO2");
                c.Length(5);
            }));
            Property(x => x.Prefixo, map => map.Column( c=> 
            {
                c.Name("PREFIXO1");
                c.Length(5);
            }));
            Property(x => x.Prefixo2, map => map.Column( c=> 
            {
                c.Name("PREFIXO2");
                c.Length(5);
            }));
            Property(x => x.HandlePrestador, map => map.Column("PRESTADOR"));
            ManyToOne(x => x.Prestador, map => 
            { 
                map.Column("PRESTADOR");
                map.Insert(false);
                map.Update(false);
            });
        }
    }
}

命令

Session.Query<Clinica>().FirstOrDefault();

生成的SQL

select HANDLE489_,
       DDD2_489_,
       DDD3_489_,
       INTERVAL4_489_,
       NUMERO5_489_,
       NUMERO6_489_,
       PREFIXO7_489_,
       FATURADE8_489_,
       PRESTADOR489_
  from (select clinica0_.HANDLE               as HANDLE489_,
               clinica0_.DDD1                 as DDD2_489_,
               clinica0_.DDD2                 as DDD3_489_,
               clinica0_.INTERVALOAGENDA      as INTERVAL4_489_,
               clinica0_.NUMERO1              as NUMERO5_489_,
               clinica0_.NUMERO2              as NUMERO6_489_,
               clinica0_.PREFIXO1             as PREFIXO7_489_,
               clinica0_.FATURADEPARCELAMENTO as FATURADE8_489_,
               clinica0_.PRESTADOR            as PRESTADOR489_
          from CLI_CLINICA clinica0_)
 where rownum <= 1

例外

ORA-00904: "CLINICA0_"."FATURADEPARCELAMENTO": invalid identifier

有趣的观察:

• 它更可能影响更大的实体(具有更多数量的属性),但偶尔也会影响较小的实体;
• 生成的SQL始终具有与映射属性相同的列数;
• SQL上的列与映射类上的映射属性的顺序相同;
• 错误的列将替换现有的列;
• 错误的列是不同映射实体中的有效列;
• 受影响的实体与具有错误列的实体之间没有关系;

其他详情:

• .NET版本: 4.0
• NHibernate版本: 3.3.3.400
• 按代码映射: NHibernate.Mapping.ByCode
• 按代码配置: NHibernate.Cfg

加载映射

var mapper = new ModelMapper();

foreach (var assembly in resolver.GetAssemblies()) // resolver is a class that gets all the assemblies for the current application
    mapper.AddMappings(assembly.GetExportedTypes());

var mapping = mapper.CompileMappingForAllExplicitlyAddedEntities();

return mapping;

SessionFactory配置

var configure = new Configuration();
configure.DataBaseIntegration(x =>
                                  {
                                      x.Dialect<Oracle10gDialect>();  // Custom class
                                      x.ConnectionString = ConnectionString;
                                      x.BatchSize = 100;
                                      x.Driver<OracleMultiQueryDataClientDriver>();  // Custom class
                                      x.MaximumDepthOfOuterJoinFetching = 10;
                                      x.Timeout = 250;
                                      x.PrepareCommands = true;
                                      x.HqlToSqlSubstitutions = "true 'S', false 'N', yes 'S', no 'N'";
                                      x.LogFormattedSql = true;
                                      x.LogSqlInConsole = true;
                                      x.AutoCommentSql = true;
                                      x.IsolationLevel = IsolationLevel.ReadCommitted;
                                      x.ConnectionProvider<ConnectionProvider>();  // Custom class
                                  });
configure.Properties.Add(new KeyValuePair<string, string>("hibernate.command_timeout", "250"));
configure.Proxy(x => x.ProxyFactoryFactory<NHibernate.Bytecode.DefaultProxyFactoryFactory>());
configure.LinqToHqlGeneratorsRegistry<LinqToHqlGeneratorsRegistry>();
configure.CurrentSessionContext<NHibernate.Context.WebSessionContext>();
var mapping = GetMappings(); // Method showed above
mapping.autoimport = false;
configure.AddMapping(mapping);
var listener = new AuditEventListener();
configure.EventListeners.PostInsertEventListeners = new IPostInsertEventListener[] { listener };
configure.EventListeners.PostUpdateEventListeners = new IPostUpdateEventListener[] { listener };
configure.SessionFactory().GenerateStatistics();
return configure;

Answer 1

检查你的查询日志，看看它运行什么类型的查询，在你的 sql 中，你可以发现问题。