Question

我有员工和职能部门，银行班级员工和职能部门具有@OneToMany关系，并且员工和银行也有@OneToMany关系。如果用户编辑表格并更改功能和/或银行我想更新关系。但是当我改变关系时由于列的唯一性，我得到重复条目异常，因为员工对象作为新实体持久存在

我试图从该函数中删除该雇员，并将该雇员的函数设置为null，并获取一个新函数并将该雇员添加到该函数中并设置新功能，但不起作用。任何想法，请

@Entity
public class Employee extends GeneratedIdEntity<Long> {       
   @ManyToOne(optional = false)
   private Functions function;

   @ManyToOne(optional = false)
   private Bank bank;

   @OneToMany(
           mappedBy = "employee",
           fetch = LAZY,
           cascade = ALL,
           orphanRemoval = true
   )
   private List<RubricValue> rubricsValues = new ArrayList<>();

   @OneToMany(
           mappedBy = "employee",
           fetch = LAZY,
           cascade = ALL,
           orphanRemoval = true
   )
   List<EmployeeStatus> employeesStatus=new ArrayList<>();
}

@Entity
public class Functions extends GeneratedIdEntity<Long>{
    @OneToMany(
            mappedBy = "function",
            fetch = LAZY,
            cascade = ALL,
            orphanRemoval = true
    )
    private List<Employee> employees=new ArrayList<>();    

    public void addEmployee(Employee employee ){
        employees.add(employee);
    }
    public void removeEmployee(Employee employee){
        employees.remove(employee);
    }    
}

@Entity
public class Bank extends GeneratedIdEntity<Long> {
   @OneToMany(
           mappedBy = "bamk",
           fetch = LAZY,
           cascade = ALL,
           orphanRemoval = true
   )
   private List<Employee> employees = new ArrayList<>();

   public void addEmployee(Employee employee ){
       employees.add(employee);
   }
   public void removeEmployee(Employee employee){
       employees.remove(employee);
   }
}

@Stateless
public class EmployeeService extends BaseEntityService<Long, Employee> {
    @Inject
    FunctionService functionService;

    @Inject
    BankService bankService;

    public void update(Employee employee, String newFunctionName, String newBankName) {
        if (!employee.getBank().getName().equals(newBankName)) {
            employee.getBank().removeEmployee(employee);
            employee.setBank(null);
            Bank newBank = bankService.getByName(newBankName);
            newBank.addEmployee(employee);
            employee.setBank(newBank);

        }
        if (!employee.getFunction().getName().equals(newFunctionName)) {
            employee.getFunction().removeEmployee(employee);
            employee.setFunction(null);
            Functions newFunction = functionService.getByName(newFunctionName);
            newFunction.addEmployee(employee);
            employee.setFunction(newFunction);

        }
    }   
}

异常堆栈跟踪原因： java.sql.SQLIntegrityConstraintViolationException：重复的条目键为“ REGISTRATIONNUMBER”的“ dkfhks32” com.mysql.cj.jdbc.exceptions.SQLError.createSQLException（SQLError.java:115）在 com.mysql.cj.jdbc.exceptions.SQLError.createSQLException（SQLError.java:95）在 com.mysql.cj.jdbc.exceptions.SQLExceptionsMapping.translateException（SQLExceptionsMapping.java:122）在 com.mysql.cj.jdbc.ClientPreparedStatement.executeInternal（ClientPreparedStatement.java:960）在 com.mysql.cj.jdbc.ClientPreparedStatement.executeUpdateInternal（ClientPreparedStatement.java:1116）在 com.mysql.cj.jdbc.ClientPreparedStatement.executeUpdateInternal（ClientPreparedStatement.java:1066）在 com.mysql.cj.jdbc.ClientPreparedStatement.executeLargeUpdate（ClientPreparedStatement.java:1396）在 com.mysql.cj.jdbc.ClientPreparedStatement.executeUpdate（ClientPreparedStatement.java:1051）在 com.sun.gjc.spi.base.PreparedStatementWrapper.executeUpdate（PreparedStatementWrapper.java:127）在sun.reflect.GeneratedMethodAccessor54.invoke（未知源）处 sun.reflect.DelegatingMethodAccessorImpl.invoke（DelegatingMethodAccessorImpl.java:43）在java.lang.reflect.Method.invoke（Method.java:498）在 com.sun.gjc.spi.jdbc40.ProfiledConnectionWrapper40 $ 1.invoke（ProfiledConnectionWrapper40.java:437）在com.sun.proxy。$ Proxy268.executeUpdate（未知源）处 org.eclipse.persistence.internal.databaseaccess.DatabaseAccessor.executeDirectNoSelect（DatabaseAccessor.java:898）

Answer 1

您不必通过先删除现有银行的引用来更改bank的{{1}}。您可以简单地去：

employee

这将正确更新映射。更新if (!employee.getBank().getName().equals(newBankName)) { Bank newBank = bankService.getByName(newBankName); //You must also do an entity validation/null check here. The newBank might not be present after all. employee.setBank(newBank); }的{{1}}

也是如此

如何更新@OneToMany双向关系

1 个答案: