Java 如何在Hibernate中映射同一个表中的一对多映射

我有一张这样的桌子：

Id int
Source VARCHAR
Target VARCHAR

select * from `TestTable` t1
left join `TestTable` t2 on t1.`Target` = t2.`Target`
and t1.`Id` <> t2.`Id`

@Entity
@Table(name = "test1")
public class Test1 implements Serializable {

private int id;
private String source;
private String target;

private List<Test1> others;

@Id
public int getId() {
    return id;
}

public void setId(int id) {
    this.id = id;
}

@Column(name = "source")
public String getSource() {
    return source;
}

public void setSource(String source) {
    this.source = source;
}

@Column(name = "target")
public String getTarget() {
    return target;
}

public void setTarget(String target) {
    this.target = target;
}

@OneToMany(targetEntity = Test1.class)
public List<Test1> getOthers() {
    return others;
}

public void setOthers(List<Test1> others) {
    this.others = others;
}

}

    @JoinColumn(name = "target", referencedColumnName = "target")

我想这样提问：

Id int
Source VARCHAR
Target VARCHAR

select * from `TestTable` t1
left join `TestTable` t2 on t1.`Target` = t2.`Target`
and t1.`Id` <> t2.`Id`

@Entity
@Table(name = "test1")
public class Test1 implements Serializable {

private int id;
private String source;
private String target;

private List<Test1> others;

@Id
public int getId() {
    return id;
}

public void setId(int id) {
    this.id = id;
}

@Column(name = "source")
public String getSource() {
    return source;
}

public void setSource(String source) {
    this.source = source;
}

@Column(name = "target")
public String getTarget() {
    return target;
}

public void setTarget(String target) {
    this.target = target;
}

@OneToMany(targetEntity = Test1.class)
public List<Test1> getOthers() {
    return others;
}

public void setOthers(List<Test1> others) {
    this.others = others;
}

}

    @JoinColumn(name = "target", referencedColumnName = "target")

从`TestTable`t1中选择*
在t1上左连接`TestTable`t2。`Target`=t2。`Target`
和t1.`Id`t2.`Id`

那么，如何使用java注释对映射进行编码呢

---

如何使用hibernate进行查询？

在hibernate中将一对多映射到同一个表不是一个问题，您可以使用如下注释：

Id int
Source VARCHAR
Target VARCHAR

select * from `TestTable` t1
left join `TestTable` t2 on t1.`Target` = t2.`Target`
and t1.`Id` <> t2.`Id`

@Entity
@Table(name = "test1")
public class Test1 implements Serializable {

private int id;
private String source;
private String target;

private List<Test1> others;

@Id
public int getId() {
    return id;
}

public void setId(int id) {
    this.id = id;
}

@Column(name = "source")
public String getSource() {
    return source;
}

public void setSource(String source) {
    this.source = source;
}

@Column(name = "target")
public String getTarget() {
    return target;
}

public void setTarget(String target) {
    this.target = target;
}

@OneToMany(targetEntity = Test1.class)
public List<Test1> getOthers() {
    return others;
}

public void setOthers(List<Test1> others) {
    this.others = others;
}

}

    @JoinColumn(name = "target", referencedColumnName = "target")

但在这种映射中，如果父对象具有相同的“target”字段，则父对象将作为子对象包含，因为您无法将查询的其他部分放入映射中

t1.`Id` <> t2.`Id`

t1.`Id`t2.`Id`

到目前为止，您尝试了什么？您是否可以尝试在目标类it self中映射两个关系，即一对多和多对一，您是否可以尝试编写一个HQL，看看会发生什么？看看这个自连接示例。我假设在你的情况下唯一会改变的是查询。