springboot jpa 复合主键

https://blog.csdn.net/wyc_cs/article/details/9031991

创建一个复合主键类

public class LevelPostMultiKeysClass  implements Serializable{
    private Integer levelId;
    private Integer postId;

    public LevelPostMultiKeysClass() {
    }

    public LevelPostMultiKeysClass(Integer levelId, Integer postId) {
        this.levelId = levelId;
        this.postId = postId;
    }

    @Override
    public int hashCode() {
        final int PRIME = 31;
        int result = 1;
        result = PRIME * result + ((levelId == null) ? 0 : levelId.hashCode());
        result = PRIME * result + ((postId == null) ? 0 : postId.hashCode());
        return result;
    }

    @Override
    public boolean equals(Object obj){
        if(this == obj){
            return true;
        }
        if(obj == null){
            return false;
        }
        if(getClass() != obj.getClass()){
            return false;
        }

        final LevelPostMultiKeysClass other = (LevelPostMultiKeysClass)obj;
        if(levelId == null){
            if(other.levelId != null){
                return false;
            }
        }else if(!levelId.equals(other.levelId)){
            return false;
        }
        if(postId == null){
            if(other.postId != null){
                return false;
            }
        }else if(!postId.equals(other.postId)){
            return false;
        }
        return true;
    }

}