Hibernate使用標準或hql查詢/實現多個表

Question

我是Hibernate的新手，希望實現hibernate標準或hql來查詢多個表以獲得結果，我有問題要做。 現在我是使用本地SQL休眠來完成我需要，但想嘗試與HQL /標準相同.. 下面是我用得到的結果本地查詢..

select table1.dmname,table2.polname,table3.path,table4.uidname 
    from table1,table2,table3,table4 
    where table3.dmnid = table1.dmnid 
    and table3.polid = table2.polid 
    and table3.3.uid = table4.uid 

下面

是我的實體POJO類

表1：

@Entity 
@Table(name = "table1", uniqueConstraints = @UniqueConstraint(columnNames = "dmname")) 
     @Cache(usage=CacheConcurrencyStrategy.READ_ONLY,region="domain") 
public class table1 { 

    private String dmnid; 
    private String dmnname; 

    @Id 
    @Column(name = "dmnid", unique = true, nullable = false) 
    public String getDmnid() { 
     return this.dmnid; 
    } 

    public void setDmnid(String dmnid) { 
     this.dmnid = dmnid; 
    } 

    @Column(name = "dmnname", unique = true, nullable = false) 
    public String getDmnname() { 
     return this.dmnname; 
    } 

    public void setDmnname(String dmnname) { 
     this.dmnname = dmnname; 
    } 

表2：

@Entity 
@Table(name = "table2", uniqueConstraints = @UniqueConstraint(columnNames = { 
     "dmnname", "polname" })) 
public class table2 implements java.io.Serializable { 

    private String dmnname; 
    private String polid; 
    private String polname; 

    // getters and setter 

表3：

@Entity 
@Table(name = "table3") 
public class table3 implements java.io.Serializable { 

    private String dmnname; 
    private String polid; 
    private String uid; 
    private String path; 

    // getters and setters 

表4：

@Entity 
@Table(name = "table4", uniqueConstraints = @UniqueConstraint(columnNames = "uidname")) 
public class table4 implements java.io.Serializable { 

    private String uid; 
    private String uidname; 

    // getters and setters 

我還沒有實現出來的表之間的映射在POJO類還和我很難理解這一點.. so co從社區的任何幫助救出我.. 感謝您查看此和任何幫助將不勝感激..

Answer 1

我建議你參考Hibernate文檔在這裏詳細瞭解關聯。 http://docs.jboss.org/hibernate/orm/5.2/userguide/html_single/Hibernate_User_Guide.html#associations

關於您的HQL的問題，它會是這個樣子轉換您的本地SQL（除非你需要的任何顯式連接條件）：

Query query = session.createQuery('from table1 t1,table2 t2,table3 t3,table4 t4 
     where t3.dmnid = t1.dmnid 
     and t3.polid = t2.polid 
     and t3.uid = t4.uid'); 
    List results = query.list();