• hibernate many2one


    package com.bjsxt.hibernate;

    import javax.persistence.Embedded;
    import javax.persistence.Entity;
    import javax.persistence.GeneratedValue;
    import javax.persistence.Id;
    import javax.persistence.JoinColumn;
    import javax.persistence.JoinColumns;
    import javax.persistence.ManyToOne;
    import javax.persistence.OneToOne;
    import javax.persistence.PrimaryKeyJoinColumn;
    import javax.persistence.Table;

    @Entity
    @Table(name="t_user")
    public class User {
    @Id
    @GeneratedValue
    private int id;
    private String name;
    @ManyToOne
    @JoinColumn(name ="groupId")          //多加了一列   表示 某个user 属于那个group          多对一  多的一方 加字段     
    private Group group;
    public int getId() {
    return id;
    }
    public Group getGroup() {
    return group;
    }
    public void setGroup(Group group) {
    this.group = group;
    }
    public void setId(int id) {
    this.id = id;
    }
    public String getName() {
    return name;
    }
    public void setName(String name) {
    this.name = name;
    }



    }

    ``````````````````````````````````````````````````````````````````````

    package com.bjsxt.hibernate;

    import javax.persistence.Embedded;
    import javax.persistence.Entity;
    import javax.persistence.GeneratedValue;
    import javax.persistence.Id;
    import javax.persistence.JoinColumn;
    import javax.persistence.JoinColumns;
    import javax.persistence.OneToOne;
    import javax.persistence.PrimaryKeyJoinColumn;
    import javax.persistence.Table;

    @Entity
    @Table(name="t_group")
    public class Group {
    @Id
    @GeneratedValue
    private int id;
    private String name;
    public int getId() {
    return id;
    }
    public void setId(int id) {
    this.id = id;
    }
    public String getName() {
    return name;
    }
    public void setName(String name) {
    this.name = name;
    }


    }

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  • 原文地址:https://www.cnblogs.com/lize1215/p/7641508.html
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