我们可以在hibernate中的两个表之间建立@OneToMany和@ManyToOne关系吗？

Question

例如

public class Portfolio implements Serializable {

    @ManyToOne()
    @JoinColumn(name = "PORTFOLIO_OWNER", referencedColumnName = "USER_ID", foreignKey = @ForeignKey(name = "FK__USER__PORTFOLIO"), nullable = false)
    private User portfolioOwner;

    @ManyToOne()
    @JoinColumn(name = "ACCOUNT_CAPTAIN", referencedColumnName = "USER_ID", foreignKey = @ForeignKey(name = "FK__USER__PORTFOLIO2"))
    private User accountCaptain;

}

和

public class User {

    @ManyToOne
    @JoinColumn(name = "PORTFOLIO_ID", referencedColumnName = "PORTFOLIO_ID", foreignKey = @ForeignKey(name = "FK_DEF_PORTFOLIO_USER"))
    @Fetch(FetchMode.JOIN)
    private Portfolio defaultPortfolio;

}

我在使用JACKSON作为JSON

获取它们时遇到了Stackoverflow

  

org.springframework.http.converter.HttpMessageNotWritableException：   无法写内容：无限递归（StackOverflowError）   （通过参考链：   com.User [＆＃34; defaultPortfolio＆＃34;] - ＆GT; com..Portfolio [＆＃34; portfolioOwner＆＃34;] - ＆GT; com.User [＆＃34; defaultPortfolio＆＃34;] - ＆GT;玉米.Portfolio [＆＃34; portfolioOwner＆＃34;] - ＆GT; com..User [＆＃34; defaultPortfolio＆＃34;] -

Answer 1

你需要将json ignore添加到关系ex：

的一侧

public class Portfolio implements Serializable {

    @ManyToOne()
    @JoinColumn(name = "PORTFOLIO_OWNER", referencedColumnName = "USER_ID", foreignKey = @ForeignKey(name = "FK__USER__PORTFOLIO"), nullable = false)
    @JsonIgnore
    private User portfolioOwner;

    @ManyToOne()
    @JoinColumn(name = "ACCOUNT_CAPTAIN", referencedColumnName = "USER_ID", foreignKey = @ForeignKey(name = "FK__USER__PORTFOLIO2"))
    private User accountCaptain;

}