JPA 保留具有复合主键的表对象列表

发布于 2024-12-08 23:19:34 字数 844 浏览 0 评论 0原文

我需要保存具有复合主键的表的对象列表，我正在这样做，如下所示。但我收到错误 Caused by: java.sql.BatchUpdateException: ORA-00001: 违反了唯一约束。但列表中的项目是唯一的，我做错了什么。

// 表结构

@Entity
   @Table(name="COMP_PRIMARY")
   CompPrimaryObj{
   @Id
   @Column(name="KEY1")
   private String key1;

   @Id
  @Column(name="KEY2")
  private Long key2;
   }

// 我的服务层中的代码

List<CompPrimaryObj> compPrimaryObjList = new ArrayList<CompPrimaryObj>();
CompPrimaryObj obj1 = new CompPrimaryObj();
obj1.setKey1("key1");
obj1.setKey2(11111);
compPrimaryObjList.add(obj1);
CompPrimaryObj obj2 = new CompPrimaryObj();
obj2.setKey1("key2");
obj2.setKey2(222222);
compPrimaryObjList.add(obj2);
for(CompPrimaryObj compPrimaryObj:compPrimaryObjList){
   em.persist(compPrimaryObj);  // em stands for Entity manger instance
}

原文

I need to save a list of objects of a table with composite primary key, I am doing as shown below. But I am getting an error Caused by: java.sql.BatchUpdateException: ORA-00001: unique constraint violated.
But the items in the list are unique, what am I doing wrong.

// Table structure

@Entity
   @Table(name="COMP_PRIMARY")
   CompPrimaryObj{
   @Id
   @Column(name="KEY1")
   private String key1;

   @Id
  @Column(name="KEY2")
  private Long key2;
   }

// code in my service layer

List<CompPrimaryObj> compPrimaryObjList = new ArrayList<CompPrimaryObj>();
CompPrimaryObj obj1 = new CompPrimaryObj();
obj1.setKey1("key1");
obj1.setKey2(11111);
compPrimaryObjList.add(obj1);
CompPrimaryObj obj2 = new CompPrimaryObj();
obj2.setKey1("key2");
obj2.setKey2(222222);
compPrimaryObjList.add(obj2);
for(CompPrimaryObj compPrimaryObj:compPrimaryObjList){
   em.persist(compPrimaryObj);  // em stands for Entity manger instance
}

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紫罗兰の梦幻 2024-12-15 23:19:34

处理复合主键时，您有两种选择。在每个类中，您都必须创建一个新类来保存表示 PK 的字段：

复合主键：

@Entity 
@Table(name="COMP_PRIMARY")
@IdClass(CompPrimaryObjId.class)
public class CompPrimaryObj {
    @Id 
    @Column(name="KEY1")
    String key1;
    @Id 
    @Column(name="KEY2")
    Long key2;
    //...
}
public class CompPrimaryObjId{
    String key1;
    Long key2;
}

或带有嵌入式主键：

@Embeddable
public class CompPrimaryObjId {       
    @Column(name="KEY1")
    private String key1;
    @Column(name="KEY2")
    private Long key2;
    // ...
   }
}

@Entity
@Table(name="COMP_PRIMARY")
public class CompPrimaryObj {
     @EmbeddedId
     private CompPrimaryObjId id;
     //....
}

When dealing with a composite primary key, you have two options. In each of them, you've got to create a new class to hold the fields that represent the PK:

Composite Primary Key:

@Entity 
@Table(name="COMP_PRIMARY")
@IdClass(CompPrimaryObjId.class)
public class CompPrimaryObj {
    @Id 
    @Column(name="KEY1")
    String key1;
    @Id 
    @Column(name="KEY2")
    Long key2;
    //...
}
public class CompPrimaryObjId{
    String key1;
    Long key2;
}

Or with Embedded Primary Keys:

@Embeddable
public class CompPrimaryObjId {       
    @Column(name="KEY1")
    private String key1;
    @Column(name="KEY2")
    private Long key2;
    // ...
   }
}

@Entity
@Table(name="COMP_PRIMARY")
public class CompPrimaryObj {
     @EmbeddedId
     private CompPrimaryObjId id;
     //....
}

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