Spring Boot中使用JPA默认集成了Hibernater，当我们使用单主键的@Entity还是比较方便的，只需要加上@Id注解即可，那如果遇到两个列形成联合主键的场景，该如何定义@Entity呢？下文即为实践。

定义联合主键

import javax.persistence.Embeddable;
import java.io.Serializable;

//要在类上使用@Embeddable注解，标识其为一个增强的主键类
@Embeddable
//一定要实现Serializable序列化接口
public class VerifyResultPK implements Serializable{
    //两个成员变量，即为联合主键列
    private String cdaname;
    private Long cdaxh;
	//建议声明2个构造方法，一个无参，一个全参
    public VerifyResultPK() {
    }

    public VerifyResultPK(String cdaname, Long cdaxh) {
        this.cdaname = cdaname;
        this.cdaxh = cdaxh;
    }
    //省略getter,setter
}

在Model上使用联合主键

import javax.persistence.EmbeddedId;
import javax.persistence.Entity;
import javax.persistence.Table;
import java.io.Serializable;
import java.sql.Timestamp;

@Entity
@Table(name = "TAS_CDAYZ_YZJG")
public class VerifyResultModel implements Serializable{
    //使用@EmbeddedId注解，表明这是一个增强的主键
    @EmbeddedId
    VerifyResultPK key;
    private Boolean yzzt;
    private Integer cws;
    private Long yzxh;
    private Timestamp yzsj;
	//构造方法里处理主键类的赋值
    public VerifyResultModel(String cdaname, Long cdaxh, Boolean yzzt, Integer cws, Long yzxh, Timestamp yzsj) {
        VerifyResultPK key = new VerifyResultPK(cdaname,cdaxh);
        this.key = key;
        this.yzzt = yzzt;
        this.cws = cws;
        this.yzxh = yzxh;
        this.yzsj = yzsj;
    }

    //省略getter,setter
}

END