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                ??碼云GVP開源項目 12k star Uniapp+ElementUI 功能強大 支持多語言、二開方便! 廣告
                **1. 單向一對一查詢** 查詢 Human 進而查詢 IdCard。 ```java public class Human { @OneToOne //card_id 對應 IdCard.id 屬性名 //將會在表human中建立card_id的物理外鍵 @JoinColumn(name = "card_id", referencedColumnName = "id") private IdCard idCard; } ``` ```java public class IdCard { //IdCard不需要任何關于Human的配置 } ``` <br/> **2. 雙向一對一查詢** ```java public class IdCard { //idCard 對應 Human.idCard 屬性名 //不會在表IdCard中生成Human的物理外鍵或邏輯外鍵的 @OneToOne(mappedBy = "idCard") private Human human; } ``` >[warning] 如果你使用 lombok 請查看章節【注意事項】,了解一些細節。
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