JPA（五）：映射关联关系------映射单向多对一的关联关系

映射单向多对一的关联关系

新建Customer.java：

package com.dx.jpa.singlemanytoone;

import java.util.Date;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Table;
import javax.persistence.Temporal;
import javax.persistence.TemporalType;
import javax.persistence.Transient;

@Entity
@Table(name = "jpa_customer")
public class Customer {
    private Integer id;
    private String fullName;
    private Integer age;
    private Date birth;
    private Date createDate;

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    @Column(name = "FULL_NAME", length = 64, nullable = false)
    public String getFullName() {
        return fullName;
    }

    public void setFullName(String fullName) {
        this.fullName = fullName;
    }

    public Integer getAge() {
        return age;
    }

    public void setAge(Integer age) {
        this.age = age;
    }

    @Temporal(TemporalType.DATE)
    public Date getBirth() {
        return birth;
    }

    public void setBirth(Date birth) {
        this.birth = birth;
    }

    @Temporal(TemporalType.TIMESTAMP)
    public Date getCreateDate() {
        return createDate;
    }

    public void setCreateDate(Date createDate) {
        this.createDate = createDate;
    }

    // 帮助方法，不希望保存到数据库，但是需要动态获取Customer对象的属性。
    @Transient
    public String getCustomerInfo() {
        return "username:" + fullName + ",age:" + age;
    }
}

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