Spring数据JPA一对多关系不保存子表

Question

母实体

@OneToMany(fetch = FetchType.EAGER, mappedBy = "paramRef", cascade=CascadeType.ALL)
public Set getParamList() { return this.paramList; }

子实体

@ManyToOne(fetch = FetchType.EAGER) @JoinColumn(name = "param_Ref_Id", nullable = false, insertable=false, updatable=false)
public ParamRef1 getParamRef() { return this.paramRef; }

代码持久化

ParamRef1 pr = new ParamRef1();
pr.setName("TEST PARAM");

Param1 p1 = new Param1() p1.setParamValue("ONE") p1.setParamRef(pr);
Param1 p2 = new Param1() p2.setParamValue("TWO") p2.setParamRef(pr);

Set paramList = new HashSet() paramList.add(p1) paramList.add(p2)

pr.setParamList(paramList)

pr = paramRefDao1.save(pr)

请告诉我这些步骤是否正确。我有以下例外。并且无法理解为什么父id在子表中不可用

原因：org.hibernate.exception.ConstraintViolation异常：无法将值NULL插入到列PARAM_REF_ID，表PARAM中；列不允许空值。INSERT失败。

Answer 1

父表的PARAM_REF_ID列缺少值

ParamRef1 pr = new ParamRef1();
pr.setName("TEST PARAM");
pr.setParamRefId(1); // replace 1 with any other valid id as value