JoinColumn 的name 和referencedColumnName

本文介绍了在外键定义中name属性默认使用主键作为外键的情况,同时对比了referencedColumnName属性的作用,即允许指定除主键之外的其他字段作为外键。

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http://blog.youkuaiyun.com/z69183787/article/details/20044343

name  是默认将外实体的主键作为外键

二referencedColumnName  则不是,他可以制定

但是一般都是主键作为外键

package com.kucun.data.entity; import java.util.List; import javax.persistence.Column; import javax.persistence.Entity; import javax.persistence.Id; import javax.persistence.ManyToMany; import javax.persistence.OneToMany; import javax.persistence.Table; import javax.persistence.UniqueConstraint; import org.hibernate.annotations.Type; import com.fasterxml.jackson.annotation.JsonIgnore; import com.fasterxml.jackson.annotation.JsonIgnoreProperties; import com.fasterxml.jackson.databind.annotation.JsonSerialize; import com.kucun.data.entity.DTO.FullEntitySerializer; import com.kucun.data.entity.DTO.UniqueEntity; /** * 木皮 * @author Administrator * */ @Entity @Table(name="mupi") @UniqueEntity( repositoryName = "mupi", fields = {"name", "you"}, message = "木皮已存在" ) @JsonSerialize(using = FullEntitySerializer.class) public class Mupi extends EntityBasis{ /** * 是否有油漆 */ @Column(name="you") @Type(type = "org.hibernate.type.BooleanType") private Boolean you; private String name; public String getName() { return name; } public void setName(String name) { this.name = name; } // 添加 OneToMany 映射 @OneToMany(mappedBy = "mupi1") // 指向 Bancai 中的 mupi1 字段 private List<Bancai> bancaisForMupi1; @OneToMany(mappedBy = "mupi2") // 指向 Bancai 中的 mupi2 字段 private List<Bancai> bancaisForMupi2; public List<Bancai> getBancaisForMupi1() { return bancaisForMupi1; } public void setBancaisForMupi1(List<Bancai> bancaisForMupi1) { this.bancaisForMupi1 = bancaisForMupi1; } public List<Bancai> getBancaisForMupi2() { return bancaisForMupi2; } public void setBancaisForMupi2(List<Bancai> bancaisForMupi2) { this.bancaisForMupi2 = bancaisForMupi2; } public Mupi() { super(); } public Boolean getYou() { return you; } public void setYou(Boolean you) { this.you = you; } } package com.kucun.data.entity; import javax.persistence.CascadeType; import javax.persistence.Entity; import javax.persistence.FetchType; import javax.persistence.JoinColumn; import javax.persistence.ManyToOne; import javax.persistence.OneToOne; import javax.persistence.Table; import com.kucun.data.entity.DTO.*; import com.fasterxml.jackson.databind.annotation.JsonSerialize; /** * 板材 * @author Administrator * */ @Entity @Table(name="bancai") @JsonSerialize(using = FullEntitySerializer.class) @UniqueEntity( repositoryName = "bancai", fields = {"houdu", "caizhi", "mupi1", "mupi2"}, message = "板材组合已存在" ) public class Bancai extends EntityBasis { @ManyToOne( fetch = FetchType.LAZY) @JoinColumn(name = "caizhi_id") // private Caizhi caizhi; @ManyToOne( fetch = FetchType.LAZY) @JoinColumn(name = "mupi1_id") private Mupi mupi1; @ManyToOne( fetch = FetchType.LAZY) @JoinColumn(name = "mupi2_id") private Mupi mupi2; private Double houdu; @OneToOne( cascade = CascadeType.ALL, orphanRemoval = true, // 添加此配置 fetch = FetchType.LAZY ) @JoinColumn(name = "kucun_id", referencedColumnName = "id") private Kucun kucun; public Kucun getKucun() { return kucun; } public void setKucun(Kucun kucun) { this.kucun = kucun; } public Caizhi getCaizhi() { return caizhi; } public void setCaizhi(Caizhi caizhi) { this.caizhi = caizhi; } public Mupi getMupi1() { return mupi1; } public void setMupi1(Mupi mupi1) { this.mupi1 = mupi1; } public Mupi getMupi2() { return mupi2; } public void setMupi2(Mupi mupi2) { this.mupi2 = mupi2; } public Double getHoudu() { return houdu; } public void setHoudu(Double houdu) { this.houdu = houdu; } public Bancai(Integer id, Caizhi caizhi, Mupi mupi1, Mupi mupi2, Double houdu) { super( id); this.caizhi = caizhi; this.mupi1 = mupi1; this.mupi2 = mupi2; this.houdu = houdu; } public Bancai() { super(); } } 把bancaisForMupi1bancaisForMupi2去掉,合并为一个并去重,外部json输出是只有一个bancais属性,当前两个不需要了
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07-26
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