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package com.employee;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.SequenceGenerator;

@Entity
@Table(name ="Employee")
public class Employee {

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO, generator = "sequence")
    @SequenceGenerator(name = "sequence", sequenceName = "seq1", allocationSize = 1)
    @Column(name = "SYS_I")
    private Integer id;

    @Column(name = "emp_id")
    private String empId;

    @Column(name = "emp_name")
    private String empName;

    @Column(name = "branch")
    private String emp_branch;

    @Column(name = "course")
    private String course;

    @Column(name = "head")
    private String head;


}

package com.employeebranch;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.SequenceGenerator;

@Entity
@Table(name ="EmployeeBranch")
public class EmployeeBranch {

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO, generator = "branchSequence")
    @SequenceGenerator(name = "branchSequence", sequenceName = "bran_seq1", allocationSize = 1)
    @Column(name = "SYS_I")
    private Integer id;

    @Column(name = "emp_branch")
    private String emp_branch;

    @Column(name = "emp_course")
    private String course;

    @Column(name = "emp_head")
    private String empHead;

}enter image description here

谁能展示我如何使用 @OneToOne 或 @OneToMany 或 @ManyToOne 等注释映射字段。在这种情况下是一种什么样的关系？

所以现在在employee分支表中，值如下所示。id emp_branch emp_course emp_head 1 机械物理 校长 2 机械化学 校长 3 电气物理 校长 4 电气化学 校长

在员工表中，值如下所示。id emp_id emp_name 分支课程负责人 1 10 sachin 机械物理 001 4 12 Yuvraaj 机械化学 002在此处输入图像描述

select e.*, b.emp_head from EmployeeBranch b , Employee e where e.branch=b.emp_branch
and e.course = b.emp_course and e.branch = 'mechanical';

我想使用 createQuery 在 Employee 实体中设置这个结果。我怎样才能实现这个？

注意：我只想通过映射 onetomany 或 onetoone 或 manytoone 来使用条件或 createQuery。当数据属于上述类型时，我很困惑。我不想使用 JPA 存储库或 HQL 或本机查询

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