SELECT b.books_name,b.books_id FROM BOOKS b JOIN AUTHOR a
ON b.AUTHOR_ID = a.AUTHOR_ID WHERE a.AUTHOR_NAME='WILLIAM';
您需要创建Book and Author实体并建立映射。由于您的架构将author_id和books表存储在一起...我假设这里有很多一对一的映射。
@Entity
@Table(name="BOOKS")
Class Books {
@Id
Integer booksId;
String booksName;
@ManyToOne
@JoinColumn(name="AUTHOR_ID")
Author author;
... more fields
public Books(Integer booksId, String booksName) {
this.booksId = booksId;
this.booksName = booksName;
}
}
@Entity
@Table(name="AUTHOR")
Class Author {
@Id
String authorId;
String authorName;
... more fields
}
JPA查询
@Query("Select new Books(b.booksId, b.booksName) from Books b where b.author.authorName = 'WILLIAM'")
List<Books> findMatchingBooks();
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