是否可以使用带@Query 注解的枚举参数?
这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);
}
然后打印出来
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]
如您所见,用户角色确实存在。
角色库:
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();
}
}
最佳答案
尝试在 Query 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);
关于java - 带有枚举参数的 Spring @Query 注解,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/17242408/