@Override
    public RoleVO findByQuery(final String roleName) {
        return RoleVO.buildRoleVO(roleMapper.findByRoleName(roleName));
    }
find role by query.

@param roleName role name
@return {@linkplain RoleVO}
shenyu-admin/src/main/java/org/apache/shenyu/admin/service/impl/RoleServiceImpl.java