Question

hibernate 注解 复合主键

@SuppressWarnings("serial")
@Entity
@Table(name = "TB_INDEX_LEFTTREE", schema = "CENDOC")
public class IndexCatalog implements java.io.Serializable {
private String sjlsh;
private String yljgdm;
private String ywybzf;

@Id
@Column(name = "SJLSH", nullable = false, length = 64)
public String getSjlsh() {
return this.sjlsh;
}

public void setSjlsh(String sjlsh) {
this.sjlsh = sjlsh;
}
@Id
@Column(name = "YLJGDM", nullable = false, length = 22)
public String getYljgdm() {
return this.yljgdm;
}
public void setYljgdm(String yljgdm) {
this.yljgdm = yljgdm;
}
@Id
@Column(name = "YWYBZF", nullable = false, length = 16)
public String getYwybzf() {
return this.ywybzf;
}
public void setYwybzf(String ywybzf) {
this.ywybzf = ywybzf;
}

复合主键 这样写 也行？？？ 我从来没这么写过 今天误打误撞 这么写了 尽然 也成功了！！ 请问大神 这么写 有没有问题？？？

Answer 1

这样对整个程序的可读性不好。
建议你改成只有1个Id的模式。
即

@SuppressWarnings("serial")

@Entity
@Table(name = "TB_INDEX_LEFTTREE", schema = "CENDOC")
public class IndexCatalog implements java.io.Serializable {

    private CatalogID id;

    public IndexCatalog() {
    }

    /** full constructor */
    public IndexCatalog(CatalogID id) {
        this.id = id;
    }

@EmbeddedId    
    @AttributeOverrides( {
        @AttributeOverride(name="SJLSH", column=@Column(name="SJLSH", nullable=false, length=64) ),
        @AttributeOverride(name="YLJGDM", column=@Column(name="YLJGDM", nullable=false, length=22) ),
        @AttributeOverride(name="YWYBZF", column=@Column(name="YWYBZF", nullable=false,length=16) )       
    public CatalogID getId() {
        return this.id;
    }
    public void setId(CatalogID id) {
        this.id = id;
    }

}

然后再写一个ID类

@Embeddable

public class CatalogID implements java.io.Serializable {

    private String sjlsh;
    private String yljgdm;
    private String ywybzf;

@Column(name = "SJLSH", nullable = false, length = 64)
public String getSjlsh() {
 return this.sjlsh;
}

public void setSjlsh(String sjlsh) {
 this.sjlsh = sjlsh;
}

@Column(name = "YLJGDM", nullable = false, length = 22)
public String getYljgdm() {
 return this.yljgdm;
}
public void setYljgdm(String yljgdm) {
 this.yljgdm = yljgdm;
}

@Column(name = "YWYBZF", nullable = false, length = 16)
public String getYwybzf() {
 return this.ywybzf;
}
public void setYwybzf(String ywybzf) {
 this.ywybzf = ywybzf;
}

}

这样整个的阅读性会更好。