有2个实体:甲板和卡片。每个甲板包含100张可能的卡中的8个。由于每个甲板都包含多个卡片,并且该卡也可以是许多不同甲板的一部分,因此我通过创建一个名为Deck_cards的新表来加入它们。
@Data
@Entity
@Table(name = "cards")
public class Card {
@Id
private Integer id;
@NotBlank
private String icon;
@NotBlank
private String name;
@ManyToMany(fetch = FetchType.LAZY,
cascade = {
CascadeType.PERSIST,
CascadeType.MERGE
},
mappedBy = "cards")
private Set<Deck> decks;
// setters and getters
}
@Data
@Entity
@Table(name="decks")
public class Deck {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Integer id;
@ManyToMany(fetch = FetchType.LAZY,
cascade = {
CascadeType.PERSIST,
CascadeType.MERGE
})
@JoinTable(name = "deck_cards",
joinColumns = { @JoinColumn(name = "deck_id",
referencedColumnName = "id")},
inverseJoinColumns = { @JoinColumn(name = "card_id",
referencedColumnName = "id")})
private Set<Card> cards = new HashSet<>();
// setters and getters
}
@Repository
@Transactional(readOnly = true)
public class DeckRepositoryImpl implements DeckRepositoryCustom {
@PersistenceContext
EntityManager entityManager;
@Override
public Deck getDeckContaining(List<String> cardIds) {
String queryStr =
"select deck_idn" +
"from deck_cardsn" +
// Hard-coding card_ids of interest for now to
// see if the query itself works
"where card_id in (1, 2, 3, 4, 5, 6, 7, 8)n" +
"group by deck_idn" +
"having count(*) = 8";
Query query = entityManager.createNativeQuery(queryStr,
Deck.class);
return (Deck) query.getSingleResult();
}
我有一个名为getDeckContaining((的自定义方法,该方法最初旨在吸收列表cardids,看看是否有一个包含列表中存储的ID的甲板。目前,我对查询字符串中的卡片ID进行了硬编码。即使那样,当我调用这样的方法时:
List<String> teamCardIdsInString = new ArrayList<>();
//....
Deck deckOfInterest =
deckRepository.getDeckContaining(teamCardIdsInString);
我收到以下错误消息:
2019-07-29 19:00:06.663 WARN 3409 --- [nio-8080-exec-1] o.h.engine.jdbc.spi.SqlExceptionHelper : SQL Error: 0, SQLState: S0022
2019-07-29 19:00:06.664 ERROR 3409 --- [nio-8080-exec-1] o.h.engine.jdbc.spi.SqlExceptionHelper : Column 'id' not found.
2019-07-29 19:00:06.690 ERROR 3409 --- [nio-8080-exec-1] o.a.c.c.C.[.[.[/].[dispatcherServlet] : Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is org.springframework.dao.InvalidDataAccessResourceUsageException: could not execute query; SQL [select deck_id
from deck_cards
where card_id in (26000060, 28000017, 26000044, 26000039, 26000027, 28000015, 26000033, 28000000)
group by deck_id
having count(*) = 8]; nested exception is org.hibernate.exception.SQLGrammarException: could not execute query] with root cause
java.sql.SQLException: Column 'id' not found.
at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:129) ~[mysql-connector-java-8.0.16.jar:8.0.16]
at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:97) ~[mysql-connector-java-8.0.16.jar:8.0.16]
at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:89) ~[mysql-connector-java-8.0.16.jar:8.0.16]
at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:63) ~[mysql-connector-java-8.0.16.jar:8.0.16]
at com.mysql.cj.jdbc.result.ResultSetImpl.findColumn(ResultSetImpl.java:561) ~[mysql-connector-java-8.0.16.jar:8.0.16]
at com.mysql.cj.jdbc.result.ResultSetImpl.getInt(ResultSetImpl.java:825) ~[mysql-connector-java-8.0.16.jar:8.0.16]
at com.zaxxer.hikari.pool.HikariProxyResultSet.getInt(HikariProxyResultSet.java) ~[HikariCP-3.2.0.jar:na]
at org.hibernate.type.descriptor.sql.IntegerTypeDescriptor$2.doExtract(IntegerTypeDescriptor.java:62) ~[hibernate-core-5.3.10.Final.jar:5.3.10.Final]
at org.hibernate.type.descriptor.sql.BasicExtractor.extract(BasicExtractor.java:47) ~[hibernate-core-5.3.10.Final.jar:5.3.10.Final]
at
我很困惑,因为我认为我使用了实体中定义的字段名称。有我可能错过的东西吗?
java.sql.sqlexception:列未找到列'id'。 问题与列的名称。 referencedColumnName = "id"
是这里可能的嫌疑人(下图(
可能的解决方案:
- 删除
referencedColumnName = "id"
- 因为您尚未按照您的数据库方案(也没有
@Column
(发布名称,请确保DB中的ID字段存在