休眠選擇錯誤的內連接

Question

我有使用Hibernate的錯誤/ HQL

我的表是表1（ID，數據），其中id - >主鍵和表2（ID，anotherdata），其中id - >對table1.id的外鍵引用。

第一類 - >

@Entity 
@Table(name = "table1") 
public class Table1 { 
    @Id 
    @GeneratedValue(strategy = GenerationType.IDENTITY) 
    @Column(name = "id") 
    private int id; 

    @Column(name = "data") 
    private String data; 

    @OneToOne 
    private Table2 table2; 
    //construct, get, set 
} 

第二類 - >

@Entity 
@Table(name = "table2") 
public class Table2 { 
    @Id 
    @GeneratedValue(strategy = GenerationType.IDENTITY) 
    @Column(name = "id") 
    private int id; 

    @Column(name = "anotherdata") 
    private String data; 
    //get, set, construct 
} 

HQL查詢是SELECT t1.id，t1.data，t2.data FROM表1爲t1 JOIN t1.table2 as t2

Hibernate日誌：select t1.id，t1.data，t2.anotherdata from table1 t1 inner join table2 on t1.t2_id = t2.id

這個原因錯誤錯誤：列t1.t2__id並不在此聲明的 「關於t1.t2_id = t2.id」到底存在

我應該有「上t1.id = t2.id「（純sql）

我該如何解決這個問題？將感謝你的答案！

Answer 1

您所查詢的是正確的，但你應該改變的映射：

@Entity 
@Table(name = "table1") 
public class Table1 { 
    @Id 
    @GeneratedValue(strategy = GenerationType.IDENTITY) 
    @Column(name = "id") 
    private int id; 

    @Column(name = "data") 
    private String data; 

    @OneToOne(mappedBy = "table1", cascade = CascadeType.ALL) 
    private Table2 table2; 
    //construct, get, set 
} 



@Entity 
@Table(name = "table2") 
public class Table2 { 
    @Id 
    @GeneratedValue(strategy = GenerationType.IDENTITY) 
    @Column(name = "id") 
    private int id; 

    @Column(name = "anotherdata") 
    private String data; 
    //get, set, construct 

    @OneToOne 
    @PrimaryKeyJoinColumn 
    private Table1 table1; 
}