Hibernate使用标准或hql查询/实现多个表

Question

我是Hibernate的新手，希望实现hibernate标准或hql来查询多个表以获得结果，我有问题要做。 现在我是使用本地SQL休眠来完成我需要，但想尝试与HQL /标准相同.. 下面是我用得到的结果本地查询..

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

是我的实体POJO类

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 

我还没有实现出来的表之间的映射在POJO类还和我很难理解这一点.. so co从社区的任何帮助救出我.. 感谢您查看此和任何帮助将不胜感激..

Answer 1

我建议你参考Hibernate文档在这里详细了解关联。 http://docs.jboss.org/hibernate/orm/5.2/userguide/html_single/Hibernate_User_Guide.html#associations

关于您的HQL的问题，它会是这个样子转换您的本地SQL（除非你需要的任何显式连接条件）：

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();