Nopcommerce 导出用户角色

Question

我正在尝试通过 nopcommerce 数据库获取每个用户的所有用户角色列表。我只需要 Customer.Id、Customer.Username、Customer.Email 和 Customer.Role（有些有多个角色）

这一切都被抬高了。

SELECT Customer.Id, Customer.Username, Customer.Email, CustomerRole.Name
FROM ((Customer
INNER JOIN CustomerRole ON CustomerRole.Id = Customer.Id)
INNER JOIN Customer_CustomerRole_Mapping ON Customer_CustomerRole_Mapping.CustomerRole_Id = CustomerRole.Id)

非常感谢任何帮助！

Answer 1

我认为您需要 LEFT OTUER JOIN 因为在您的数据库中可以是没有角色的用户；在这种情况下，您可以使用：

SELECT DISTINCT CUST.Id, CUST.Username, CUST.Email, CR.Id, CR.Name, 
CCRM.CustomerRole_Id ,
FROM CUSTOMER CUST
LEFT OUTER JOIN Customer_CustomerRole_Mapping CCRM
ON CUST.ID = CCRM.Customer_Id
LEFT OUTER JOIN CustomerRole CR
ON CCRM.CustomerRole_Id = CR.Id

此外，每个用户只能有一行，一列包含他的角色，如下所示：

SELECT DISTINCT CUST.Id, CUST.Username, CUST.Email,
Roles = STUFF((
        SELECT ',' + CAST(CR1.Name as varchar(4000))
        FROM CustomerRole CR1
        LEFT OUTER JOIN Customer_CustomerRole_Mapping CCRM1
            ON CCRM1.CustomerRole_Id = CR1.Id
        LEFT OUTER JOIN CUSTOMER CUST1
            ON CUST1.ID = CCRM1.Customer_Id
        WHERE CUST1.Id = CUST.Id
        FOR XML PATH('')
     ), 1, 1, '')
FROM CUSTOMER CUST
LEFT OUTER JOIN Customer_CustomerRole_Mapping CCRM
ON CUST.ID = CCRM.Customer_Id
LEFT OUTER JOIN CustomerRole CR
ON CCRM.CustomerRole_Id = CR.Id

根据您的使用情况，如果您有很多客户，最后一次查询可能会有点慢。