Question

我想使用Business object将SQL查询映射到Nhibernate。 Employee表中有很多字段，但我只有三个字段，只想要映射那些字段。

这是我的SQL查询

<sql-query  name="findEmployeesInfo">
<return alias="emp" class="Calibr.BusinessDocuments.BOs.Employee, BusinessDocuments"/>
<![CDATA[
  select (emp.Eid) as {emp.Id},(emp.FirstName) as {emp.FirstName},(emp.LastName) as {emp.LastName} from Employee emp
 ]]>
</sql-query>

这里是我制作构造函数来映射这些列

public Employee(int Id, string FirstName, string LastName)
{
    this.Id = Id;
    this.FirstName = FirstName;
    this.LastName = LastName;            
}

数据库员工表列名： Eid，FirstName，LastName，............

我收到此异常

无法执行查询 [select（emp.Eid）作为Eid1_0 _，（emp.FirstName）作为FirstName1_0 _，（emp.LastName）作为LastName1_0_来自Employee emp

修改：如果我选择所有列，它将完美无缺 - Select * from Employee emp

感谢您的帮助。

Answer 1

我认为您可以使用NHibernate的ad-hoc mapping功能获益：

命名查询：

<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2">
    <sql-query name="findEmployeesInfo">
      select emp.Eid as Id, emp.FirstName FirstName, emp.LastName as LastName from Employee emp
    </sql-query>
</hibernate-mapping>

员工类：

public class Employee
{
    public int Id { get; set; }
    public string FirstName { get; set; }
    public string LastName { get; set; }
    // etc...
}

即席查询：

IList<Employee> employees = session
                              .GetNamedQuery("findEmployeesInfo")
                              .SetResultTransformer(Transformers.AliasToBean(typeof(Employee)))
                              .List<Employee>();

在Nhibernate中将SQL查询映射到Business对象

1 个答案: