mysql - 如何使用子查询作为存储过程的一部分 MySQL

Question

我正在尝试创建一个过程(在 phpMyAdmin 中称为例程)并且当前有以下查询:

BEGIN

INSERT INTO `users` (`username`, `password`, `email`, `user_role_id`,` date_registered`)
    VALUES (_username, _password, _email, (SELECT `ID` FROM `roles` WHERE `role_name` = _role) , _date);

END;

但这行不通，我已经尝试为 role_ID 声明一个变量，但这也行不通，有人可以帮我解决这个问题吗？

注意

您看到的参数(以下划线 (_) 开头)都是在 phpMyAdmin 例程创建器中使用的 IN 参数

编辑

我试过的其他代码是这样的:

BEGIN

DECLARE role_id AS/*=*/ (SELECT `ID` FROM `roles` WHERE `role_name` = _role); /* tried both AS and = */

INSERT INTO `users` (`username`, `password`, `email`, `user_role_id`, `date_registered`)
    VALUES (_username, _password, _email, role_id, _date);

END;

还注意到DECLARE 的一个小错误，将上面的代码更改为:

BEGIN

DECLARE @role_id ;
SET @role_id = (SELECT `ID` FROM `roles` WHERE `role_name` = _role);

INSERT INTO `users` (`username`, `password`, `email`, `user_role_id`, `date_registered`)
    VALUES (_username, _password, _email, @role_id, _date);

END;

还是不行

Answer 1

USE [FydaDB]
GO
/****** Object:  StoredProcedure [dbo].[CountryManagerReport]    Script Date: 5/25/2018 2:12:42 AM ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
ALTER PROCEDURE [dbo].[CountryManagerReport] 
    @FromDate datetime,
    @Todate datetime,
    @countryId int
AS
BEGIN
Select FirstName+ ' ' + MiddleName+ '' +  LastName as FullName ,Email,CNIC,((select CountryCode from Country where ID=FydaAdmin.CountryId)+ '-' +(select PhoneNo from Contacts where FydaAdminId=FydaAdmin.ID)) as Mobile,
(ZipCode+ ' ,' +[Address]+ ' ,' + (select Name from City where ID=FydaAdmin.CityId )+ ', ' +(select Name from States where ID=FydaAdmin.StateId )+ ', ' +(select Name from Country where ID=FydaAdmin.CountryId)
 ) as [Address]
 from FydaAdmin where CreatedDateTime  BETWEEN  @FromDate  and @Todate or CountryId=@countryId 
END