如何从SQL Server数据表中检索一行

Question

我有一个'N'行的表，我试图逐行获取并想要执行一些操作。

有人可以帮我解决这个存储过程吗？

有关详细信息：我正在尝试从＆＃39; UserMaster＆＃39;中检索邮件ID。表一个接一个，我想用这个邮件ID发送邮件给特定用户，我可以发邮件给用户，

一个接一个地检索它们

declare @count as int
declare @inti as int

select COUNT(UserId) from tblUserMaster where AccessLevelId = '1'

SET @inti = 1

while @inti <= @count
BEGIN
    select @mail = Email_ID 
    from User_Master 
    where AccessLevelId = '1' 
    rownum(@inti)     -- here I need to retrieve one bye one row

    @inti ++;

    EXEC sp_send_dbmail @profile_name = 'PinalProfile',
                        @recipients = @mail,
                        @subject = 'Test message',
                        @body = 'This is the body of the test message.
Congrates Database Mail Received By you Successfully.'
END

Answer 1

有多种方法可以做到这一点，我认为最简单的方法是将结果集插入带有标识列的临时对象，然后遍历临时对象。这是一些伪代码：

DECLARE @t1 table (id int identity, email varchar(50)), 
    @count int,
    @i int = 1,
    @email varchar(50);

INSERT INTO @t1 (email)
    select Email_ID 
    from User_Master 
    where AccessLevelId = '1';

select @count = count(*) from @t1;

while @i <= @count
BEGIN
    select @email = email from @t1 where id = @i

    EXEC sp_send_dbmail @profile_name = 'PinalProfile',
        @recipients = @mail,
        @subject = 'Test message',
        @body = 'Test body';

    set @i = @i + 1;
END