NHibernate 在查询中使用错误的键,抛出 ObjectNotFoundByUniqueKeyException
NHibernate using wrong key in queries, ObjectNotFoundByUniqueKeyException thrown
使用 NHibernate 5.2,当我执行以下操作时,由于使用无效密钥执行错误查询,我得到了 ObjectNotFoundByUniqueKeyException
:
var session = sessionFactory.OpenSession();
var employee = new Employee(){
UserId = "joe",
Certifications = new List<Certification>()
};
employee.Certifications.Add(new Certification() { Employee = employee});
var id = session.Save(employee);
session.Flush();
session.Clear();
var emp = session.Get<Employee>(id);
foreach(var e in emp.Certifications)
{
Console.WriteLine(e.Id);
}
执行的查询
NHibernate: INSERT INTO Employee (UserId) VALUES (@p0); select SCOPE_IDENTITY();@p0 = 'joe' [Type: String (4000:0:0)]
NHibernate: INSERT INTO Certification (UserId) VALUES (@p0); select SCOPE_IDENTITY();@p0 = 'joe' [Type: String (4000:0:0)]
NHibernate: SELECT userquery_0_.Id as id1_0_0_, userquery_0_.UserId as userid2_0_0_ FROM Employee userquery_0_ WHERE userquery_0_.Id=@p0;@p0 = 1 [Type: Int32 (0:0:0)]
NHibernate: SELECT certificat0_.UserId as userid2_1_1_, certificat0_.Id as id1_1_1_, certificat0_.Id as id1_1_0_, certificat0_.UserId as userid2_1_0_ FROM Certification certificat0_ WHERE certificat0_.UserId=@p0;@p0 = 1 [Type: Int32 (0:0:0)]
NHibernate: SELECT userquery_0_.Id as id1_0_0_, userquery_0_.UserId as userid2_0_0_ FROM Employee userquery_0_ WHERE userquery_0_.UserId=@p0;@p0 = '1' [Type: String (4000:0:0)]
我希望在最后两个查询中出现 @p0 = 'joe'
,而不是 1
和 '1'
。任何人都可以看到下面映射的问题来解释这种行为吗?
类 / 映射
public class Employee
{
public virtual int Id { get; set; }
public virtual string UserId { get; set; }
public virtual ICollection<Certification> Certifications { get; set; }
}
public class EmployeeMap : ClassMap<Employee>
{
public EmployeeMap()
{
Table("Employee");
Id(x => x.Id);
Map(x => x.UserId);
HasMany(x => x.Certifications)
.KeyColumn("UserId")
.Cascade.All();
}
}
public class Certification
{
public virtual int Id { get; set; }
public virtual Employee Employee { get; set; }
}
public class CertificationMap : ClassMap<Certification>
{
public CertificationMap()
{
Table("Certification");
Id(x => x.Id);
References(x => x.Employee)
.Column("UserId")
.PropertyRef(x => x.UserId);
}
}
集合 不是 使用 Employee 的主键,而是另一个 属性 - PropertyRef
。我们必须像 many-to-one
一样通知 one-to-many 映射
HasMany(x => x.Certifications)
.KeyColumn("UserId")
.Cascade.All()
// use property, not the ID, when searching for my items
.PropertyRef("UserId")
;
事实上,缺少此映射导致在 NHibernate 加载集合时使用 ID(神奇的 1)
使用 NHibernate 5.2,当我执行以下操作时,由于使用无效密钥执行错误查询,我得到了 ObjectNotFoundByUniqueKeyException
:
var session = sessionFactory.OpenSession();
var employee = new Employee(){
UserId = "joe",
Certifications = new List<Certification>()
};
employee.Certifications.Add(new Certification() { Employee = employee});
var id = session.Save(employee);
session.Flush();
session.Clear();
var emp = session.Get<Employee>(id);
foreach(var e in emp.Certifications)
{
Console.WriteLine(e.Id);
}
执行的查询
NHibernate: INSERT INTO Employee (UserId) VALUES (@p0); select SCOPE_IDENTITY();@p0 = 'joe' [Type: String (4000:0:0)]
NHibernate: INSERT INTO Certification (UserId) VALUES (@p0); select SCOPE_IDENTITY();@p0 = 'joe' [Type: String (4000:0:0)]
NHibernate: SELECT userquery_0_.Id as id1_0_0_, userquery_0_.UserId as userid2_0_0_ FROM Employee userquery_0_ WHERE userquery_0_.Id=@p0;@p0 = 1 [Type: Int32 (0:0:0)]
NHibernate: SELECT certificat0_.UserId as userid2_1_1_, certificat0_.Id as id1_1_1_, certificat0_.Id as id1_1_0_, certificat0_.UserId as userid2_1_0_ FROM Certification certificat0_ WHERE certificat0_.UserId=@p0;@p0 = 1 [Type: Int32 (0:0:0)]
NHibernate: SELECT userquery_0_.Id as id1_0_0_, userquery_0_.UserId as userid2_0_0_ FROM Employee userquery_0_ WHERE userquery_0_.UserId=@p0;@p0 = '1' [Type: String (4000:0:0)]
我希望在最后两个查询中出现 @p0 = 'joe'
,而不是 1
和 '1'
。任何人都可以看到下面映射的问题来解释这种行为吗?
类 / 映射
public class Employee
{
public virtual int Id { get; set; }
public virtual string UserId { get; set; }
public virtual ICollection<Certification> Certifications { get; set; }
}
public class EmployeeMap : ClassMap<Employee>
{
public EmployeeMap()
{
Table("Employee");
Id(x => x.Id);
Map(x => x.UserId);
HasMany(x => x.Certifications)
.KeyColumn("UserId")
.Cascade.All();
}
}
public class Certification
{
public virtual int Id { get; set; }
public virtual Employee Employee { get; set; }
}
public class CertificationMap : ClassMap<Certification>
{
public CertificationMap()
{
Table("Certification");
Id(x => x.Id);
References(x => x.Employee)
.Column("UserId")
.PropertyRef(x => x.UserId);
}
}
集合 不是 使用 Employee 的主键,而是另一个 属性 - PropertyRef
。我们必须像 many-to-one
HasMany(x => x.Certifications)
.KeyColumn("UserId")
.Cascade.All()
// use property, not the ID, when searching for my items
.PropertyRef("UserId")
;
事实上,缺少此映射导致在 NHibernate 加载集合时使用 ID(神奇的 1)