是否可以在@Query注释中使用enum参数?
以下是我用来查找用户角色的代码:
Role userRole = roleRepository.findByRole(Roles.USER);
if ( userRole == null ) {
LOGGER.debug("No role found with role: {}", Roles.USER);
}
并打印出来
No role found with role: ROLE_USER
但如果我试图找到所有角色,这就是我得到的:
for ( Role r : roleRepository.findAll() )
LOGGER.debug("{}", r);
Role@8a8c0a[roleId=1,role=role_admin,version=0]
Role@1efe9ee[roleId=2,role=role_staff,version=0]
Role@1e70f68[roleId=3,role=role_user,version=0]
Role@a475d1[roleId=4,role=role_guest,version=0]
正如您所见,用户角色确实存在。
RoleRepository:
public interface RoleRepository extends JpaRepository<Role, Long> {
@Query("SELECT r FROM Role r WHERE LOWER(r.role) = LOWER(:role)")
public Role findByRole(@Param("role") Roles role);
}
作用:
@Entity
@Table(name = "role")
public class Role {
public enum Roles {
ADMIN("ROLE_ADMIN"),
STAFF("ROLE_STAFF"),
USER("ROLE_USER"),
GUEST("ROLE_GUEST");
private String role;
private Roles(String role) {
this.role = role;
}
public String getRole() {
return role;
}
@Override
public String toString() {
return role;
}
}
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Column(name = "role_id", updatable = false)
private Long roleId;
@Column(name = "role")
private String role;
@Version
@Column(name = "version")
private long version = 0;
public Long getRoleId() {
return roleId;
}
public String getRole() {
return role;
}
public long getVersion() {
return version;
}
@Override
public String toString() {
return new ReflectionToStringBuilder(this).toString();
}
}
答案 0 :(得分:1)
我建议正确使用JPA enumerated types。将类型“role”属性更改为:
@Column(name = "role")
@Enumerated(EnumType.STRING)
private Roles role;
这应该会自动修复查询结果。
答案 1 :(得分:0)
尝试在查询中使用SpEl并像这样调用Enum参数的toString():
@Query("SELECT r FROM Role r WHERE LOWER(r.role) = LOWER(:#{#role?.toString()})")
public Role findByRole(@Param("role") Roles role);
或更短:
@Query("SELECT r FROM Role r WHERE LOWER(r.role) = LOWER(:#{#role})")
public Role findByRole(@Param("role") Roles role);