Java spring数据jpa存储库在查询中将集合用作@Param
我在使用SpringDataJPA存储库执行自定义查询时遇到了一个问题 @查询annated方法未指定列表类型的参数 以下是实体类:Java spring数据jpa存储库在查询中将集合用作@Param,java,hibernate,jpa,spring-data,spring-data-jpa,Java,Hibernate,Jpa,Spring Data,Spring Data Jpa,我在使用SpringDataJPA存储库执行自定义查询时遇到了一个问题 @查询annated方法未指定列表类型的参数 以下是实体类: @Entity @Table(name = "\"user\"") public class User { @Id @GeneratedValue(generator = "increment") private long id; @Column(unique = true, nullable = false) private String
@Entity
@Table(name = "\"user\"")
public class User {
@Id
@GeneratedValue(generator = "increment")
private long id;
@Column(unique = true, nullable = false)
private String mail;
@ManyToMany(targetEntity = Interest.class, mappedBy = "users")
private List<Interest> interests = new ArrayList<Interest>();
...
... setters and getters.
@Entity
@Table(name = "interest")
public class Interest {
@Id
@Column(name = "interest_name", nullable = false, unique = true)
private String name;
@ManyToMany(targetEntity = User.class, fetch = FetchType.LAZY)
private List<User> users = new ArrayList<User>();
...
... setters and getters.
没有为参数2指定值,尽管第二个参数具有有效值,请按照以下要求更改代码:
Change the code as per below:
Old Code:
`@Repository
public interface UserRepository extends JpaRepository<User, Long> {
@Query("select distinct u from User u where u <> :currentUser and
u.interests in :currentInterests")
List<User> getUsersWithSameInterests(@Param("currentUser") User user,
@Param("currentInterests") List<Interest> interests);
}`
Updated Code:
`@Repository
public interface UserRepository extends JpaRepository<User, Long> {
@Query("select distinct u from User u where u.user :currentUser
and u.interests in :currentInterests")
List<User> getUsersWithSameInterests(@Param("currentUser") User user,
@Param("currentInterests") List<Interest> interests);
}`
旧代码:
`@存储库
公共接口用户存储库扩展了JpaRepository{
@查询(“从用户u中选择不同的u,其中u:currentUser和
u、 利益:当前利益)
列出getUsersWithSameInterests(@Param(“currentUser”)用户,
@参数(“当前利益”)列表利益);
}`
更新代码:
`@存储库
公共接口用户存储库扩展了JpaRepository{
@查询(“从用户u中选择不同的u,其中u.User:currentUser
和美国利益:当前利益)
列出getUsersWithSameInterests(@Param(“currentUser”)用户,
@参数(“当前利益”)列表利益);
}`
将值放入父项之间,
。。。u、 对(:currentInterests)
感兴趣,然后查看它是否有效。如果命名参数为?1
和?2
,则也可以尝试使用位置占位符。括号和位置占位符都没有帮助。我马上就试过了。:currentInterests
放在括号内。
@Autowired
private UserRepository userRepository;
@Override
public List<User> getUsersWithSameInterests(User user) {
return userRepository.getUsersWithSameInterests(user, user.getInterests());
}
org.springframework.dao.InvalidDataAccessResourceUsageException: could not extract ResultSet; SQL [n/a]; nested exception is org.hibernate.exception.SQLGrammarException: could not extract ResultSet
.
.
.
Caused by: java.sql.SQLException: No value specified for parameter 2
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:957)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:896)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:885)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:860)
at com.mysql.jdbc.PreparedStatement.checkAllParametersSet(PreparedStatement.java:2205)
at com.mysql.jdbc.PreparedStatement.fillSendPacket(PreparedStatement.java:2185)
at com.mysql.jdbc.PreparedStatement.fillSendPacket(PreparedStatement.java:2115)
at com.mysql.jdbc.PreparedStatement.executeQuery(PreparedStatement.java:1936)
at org.apache.commons.dbcp2.DelegatingPreparedStatement.executeQuery(DelegatingPreparedStatement.java:83)
at org.apache.commons.dbcp2.DelegatingPreparedStatement.executeQuery(DelegatingPreparedStatement.java:83)
at org.hibernate.engine.jdbc.internal.ResultSetReturnImpl.extract(ResultSetReturnImpl.java:70)
... 73 more
Change the code as per below:
Old Code:
`@Repository
public interface UserRepository extends JpaRepository<User, Long> {
@Query("select distinct u from User u where u <> :currentUser and
u.interests in :currentInterests")
List<User> getUsersWithSameInterests(@Param("currentUser") User user,
@Param("currentInterests") List<Interest> interests);
}`
Updated Code:
`@Repository
public interface UserRepository extends JpaRepository<User, Long> {
@Query("select distinct u from User u where u.user :currentUser
and u.interests in :currentInterests")
List<User> getUsersWithSameInterests(@Param("currentUser") User user,
@Param("currentInterests") List<Interest> interests);
}`