Question

NHibernate的。我有3张桌子：

员工{ PK：EmployeeId ，姓名，姓氏......}

项目{ PK：ProjectId ，日期，名称，...}

EmployeebyProject { PK：FK：EmployeeId，ProjectId ，date，...}

我需要制作一些CRUD，此时我在tabla EmployeebyProject中有一些记录。所以我试着找到这个记录的人。这是使用条件的方法，但发生此错误：“GenericADOException，无法执行查询”“列EmployeeId无效”，“列ProductId无效”。 此条件的问题不是转到Employee和Project表来查询idEmployee和idProject。 那我该怎么做呢？

 public EmployeebyProject GetEmployeebyProjectByIdEmployee(int idEmployee, int idProject)
        {
            using (ISession session = NHibernateSessionBuilder.OpenSession())
            {
                var employeebyProject = session
                        .CreateCriteria(typeof(EmployeebyProject))
                        .CreateCriteria("Employee", "Employee")
                        .Add(Restrictions.Eq("EmployeeId", idEmployee))
                        .UniqueResult<EmployeebyProject>();
                return employeebyProject;
            }
        }

这是EmployeebyProject的映射：

<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2"
                   assembly="AdminProject"
                   namespace="AdminProject.Business.Entity">

  <class name="EmployeebyProject">

    <composite-id>
      <key-many-to-one name="Employee" column="EmployeeId"  class="Employee"></key-many-to-one>
      <key-many-to-one name="Project" column="ProjectId"  class="Project" ></key-many-to-one>
    </composite-id> 

    <property name="DateBegin" type="DateTime"/>
    <property name="DateEnd" type="DateTime"/>

  </class>

</hibernate-mapping>

Answer 1

您从.Add(Restrictions.Eq("EmployeeId", idEmployee))调用的EmployeeId属性是错误的，EmployeeId不属于EmployeeProject实体。它属于Employee实体。因此，您的查询应该重写为

    public EmployeebyProject GetEmployeebyProjectByIdEmployee(int idEmployee, int idProject)
    {
        using (ISession session = NHibernateSessionBuilder.OpenSession())
        {
            var employeebyProject = session
                    .CreateCriteria(typeof(EmployeebyProject))
                    .CreateCriteria("Employee", "EmployeeAl")
                    .CreateCriteria("Project", "ProjectAl")
                    .Add(Restrictions.Eq("EmployeeAl.id", idEmployee))
                    .Add(Restrictions.Eq("ProjectAl.id", idProject))
                    .UniqueResult<EmployeebyProject>();
            return employeebyProject;
        }
    }

我认为您应该拨打.CreateCriteria("Employee", "EmployeeAl")而不是.CreateAlias("Employee", "EmployeeAl")而不是{{1}}

复合id错误的标准

1 个答案: