单向JPA一对多映射 - ORA-01722：无效号码

Question

我有架构两个表如下：

表1

table1_id（PK）（整数）

名称

表2

table2_id（pk）（String）

table1_id（PK）（整数）

名

我的代码看起来像这样

@Entity 
@Table(name = "Table2") 
class Table2 { 

    @Id 
    @Column(name = "table2_id") 
    private String id; 

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

    @OneToMany 
    @JoinColumn (name="table1_id") 
    private Set<Table1> table1Set = new HashSet<>(); 


    //setters and getters 
} 

@Entity 
@Table(name = "Table1") 
class Table1 { 

    @Id 
    @Column(name = "table1_id") 
    private int id; 

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

    //setters and getters 
} 

现在，当我查询：Table2Repository.findById("One")：

我得到以下错误：

Hibernate: select table2.id as table2_id_1_, table2.name as name2_1_ from table2 table20_ 
Hibernate: select table10_.table1_id as table1_id1_1_0_, table1_.table1_id as table1_id1_0_0_, table10_.table1_id as table1_id1_0_1_, table10_.name as name2_0_1_ from table1 table10_ where table10_.table1_id=? 
2017-07-25 12:53:11.352 WARN 11572 --- [   main] o.h.engine.jdbc.spi.SqlExceptionHelper : SQL Error: 1722, SQLState: 42000 
2017-07-25 12:53:11.352 ERROR 11572 --- [   main] o.h.engine.jdbc.spi.SqlExceptionHelper : ORA-01722: invalid number 

看起来有些不匹配。它似乎是使用字符串“table2_id”查询Table1，因为它应该使用“table1_id”

请帮忙！

Answer 1

映射中存在名称冲突：Table2.table1Set上的@JoinColumn (name="table1_id")与Table1.id上的@Id @Column(name = "table1_id")。请注意，加入列进入Table1,而不是Table2。

什么你大概的意思是这样的模式：PERSON(id, name, age, a_bunch_of_other_stuff)，PERSON_PHONE_NUMBER(person_id, phone_id)，PHONE_NUMBER(id, phone_number)，在这种情况下，你的映射应如下所示：

@Entity 
@Table(name = "PERSON") 
public class Person { 

    @Id 
    private int id; 

    private String name; 
    ... 

    @OneToMany 
    @JoinTable(name = "PERSON_PHONE_NUMBER", 
     joinColumns = @JoinColumn(name = "PERSON_ID", referencedColumnName = "ID"), 
     inverseJoinColumns = @JoinColumn(name = "PHONE_ID", referencedColumnName = "ID") 
    ) 
    private Set<PhoneNumber> phoneNumbers; 
    ... 
} 

@Entity 
@Table(name = "PHONE_NUMBER") 
public class PhoneNumber { 

    @Id 
    private String id; 

    @Column(name = "PHONE_NUMBER") 
    private String phoneNumber; 
    ... 
}