你如何在hibernate activerecord中加入？

Question

我怎麼聯接，將返回我的結果類似於TO-

SELECT * FROM Project LEFT JOIN ProjectRegion ON ProjectRegion.id = Project.projectRegion 

我目前使用的syntax-

Project[] projects = Project.FindAll(); 

我的表是建立與ActiveRecord的/休眠如下 -

[ActiveRecord] 
    public class ProjectRegion : ActiveRecordBase<ProjectRegion> 
    { 
     private int id; 
     private String title; 

     public ProjectRegion() 
     { 
     } 

     [PrimaryKey] 
     public int Id 
     { 
      get { return id; } 
      set { id = value; } 
     } 

     [Property] 
     public String Title 
     { 
      get { return title; } 
      set { title = value; } 
     } 
    } 


    [ActiveRecord] 
    public class Project : ActiveRecordBase<Project> 
    { 
     private int id; 
     private String projectNumber; 
     private String projectRegion; 

     public Project() 
     { 
     } 

     [PrimaryKey] 
     public int Id 
     { 
      get { return id; } 
      set { id = value; } 
     } 

     [Property] 
     public String ProjectInternalCode 
     { 
      get { return projectNumber; } 
      set { projectNumber = value; } 
     } 

     [Property] 
     public String ProjectRegion 
     { 
      get { return projectRegion; } 
      set { projectRegion = value; } 
     } 
... 

Answer 1

如果你將Project類中的ProjectRegion屬性聲明爲類型爲ProjectRegion而不是字符串，當NHibernate獲取一個Project時，它將au按照提取策略自動加入ProjectRegion表。