我创建了两个具有一对多关系的实体，当删除父记录时，我必须删除子记录。
//following entities
@IdClass(EmployeeKeys.class)
@Entity
@Table(name="SHAEM_EMPTBL")
@JsonIgnoreProperties(ignoreUnknown = true)
public class Employee {
@Id
@Column(name="CLIENTID")
private String clientid;
@Id
@Column(name="EMPID")
private String empid;
@Column(name="EMPNAME")
private String empname;
@Column(name="DOJ")
private Date doj;
@OneToMany(cascade = {CascadeType.ALL},fetch =
FetchType.LAZY,orphanRemoval
= true)
@JoinColumns(
{@JoinColumn(name = "CLIENTID", referencedColumnName = "CLIENTID"),
@JoinColumn(name = "EMPID",referencedColumnName = "EMPID"),
})
private List<EmployeeSmry> employeesmry;
@Column(name="ISACTIVE")
private String isactive;
@Column(name="SYSTEMACCESS")
private String systemaccess;
//setters and getters
}
@IdClass(EmployeeSmryKeys.class)
@Entity
@Table(name="SHAEM_EMPSMRY")
@JsonIgnoreProperties(ignoreUnknown = true)
public class EmployeeSmry implements Serializable{
@Id
@Column(name="CLIENTID")
private String clientid;
@Id
@Column(name="EMPID")
private String empid;
@Id
@Column(name="EFFDT")
@JsonFormat(shape=JsonFormat.Shape.STRING, pattern="dd/MM/yyyy")
private Date effdt;
@Column(name="STATUS")
private String status;
@Column(name="DESIGNATION")
private String designation;
@Column(name="DEPARTMENT")
private String department;
//setters and getters
}
//delete code that i have tried
public void deleteEmployee(Employee employee)
{
EntityManager em = emf.createEntityManager();
em.getTransaction().begin();
Employee employees = new Employee();
employees.setClientid(employee.getClientid());
employees.setEmpid(employee.getEmpid());
employees.setDoj(employee.getDoj());
employees.setEmployeesmry(null);
Object id = em.getEntityManagerFactory().getPersistenceUnitUtil().getIdentifier(employees);
Object obj = em.find(employees.getClass(), id);
System.out.println("===============obj=============="+obj);
em.remove(obj);
em.getTransaction().commit();
em.close();
}
//below queries are hitting
the data base
Hibernate: select employee0_.CLIENTID as CLIENTID1_6_0_,
employee0_.EMPID as EMPID2_6_0_, employee0_.ADDR1 as
ADDR3_6_0_, employee0_.ADDR2 as ADDR4_6_0_, employee0_.CITY as
CITY5_6_0_, employee0_.DOJ as DOJ11_6_0_,
employee0_.DYNAFLD01 as DYNAFLD12_6_0_,_.EMPNAME as
EMPNAME15_6_0_, employee0_.ISACTIVE as ISACTIV16_6_0_,
employee0_.SYSTEMACCESS as SYSTEMA22_6_0_, from SHAEM_EMPTBL
employee0_ where employee0_.CLIENTID=? and employee0_.EMPID=?
Hibernate: select employeesm0_.CLIENTID as CLIENTID1_5_0_,
employeesm0_.EMPID as EMPID3_5_0_, employeesm0_.EFFDT as
EFFDT2_5_0_, employeesm0_.CLIENTID as CLIENTID1_5_1_,
employeesm0_.EFFDT as EFFDT2_5_1_, employeesm0_.EMPID as
EMPID3_5_1_, employeesm0_.COMMENTS as COMMENTS4_5_1_,
employeesm0_.CREATEDBY as CREATEDB5_5_1_,
employeesm0_.CREATEDON as CREATEDO6_5_1_,
employeesm0_.DEPARTMENT as DEPARTME7_5_1_,from SHAEM_EMPSMRY
employeesm0_ where employeesm0_.CLIENTID=? and
employeesm0_.EMPID=?
Hibernate: update SHAEM_EMPSMRY set CLIENTID=null, EMPID=null
where CLIENTID=? and EMPID=?
我希望同时删除员工和employeemry记录，但出现以下异常
2019-06-19 19：36：01.187警告5384 --- [nio-8080-exec-4] o.h.engine.jdbc.spi.SqlExceptionHelper：SQL错误：515， SQLState：230002019-06-19 19：36：01.187错误5384 --- [nio- 8080-exec-4]
o.h.engine.jdbc.spi.SqlExceptionHelper：无法插入 表中的“ CLIENTID”列中为空值 '表名';列不允许为空。 UPDATE失败。
2019-06-19 19：36：01.188信息5384 --- [nio-8080-exec-4] o.h.e.j.b.internal.AbstractBatchImpl：HHH000010：开 批处理版本仍包含JDBC语句 2019-06-19 19：36：01.193错误5384 --- [nio-8080-exec-4] o.h.i.ExceptionMapperStandardImpl：HHH000346：错误 在管理冲洗期间 [org.hibernate.exception.ConstraintViolationException：无法 执行语句] javax.persistence.RollbackException：提交错误 org.hibernate.internal.ExceptionConverterImpl.convertCommitException（ExceptionConverterImpl.java:81）上的事务 在org.hibernate.engine.transaction.internal.TransactionImpl.commit（TransactionImpl.java:107）上