循环访问表而不使用游标或临时表查找超过30天的记录

Question

使用SQL Server 2012.我需要在不使用游标或临时表的情况下遍历我的表。另外，我知道辩论了：游标...... :)我在这个问题的底部有脚本使用sys.databases和msdb.dbo.restorehistory获取最后一次恢复，但这并不能解决我对此的迫切需求具体表。

场景：我有一个为恢复测试创建的表：

CREATE Table RestoreTests (
RestoreTestID int Not NULL, 
ServerName varchar (255) Not NULL, 
DatabaseName varchar (255) Not NULL, 
RestoreDate datetime Not NULL,
BackupFile varchar (1000) Not NULL)

我插入了8条记录：

• 2台服务器 - 4条记录/服务器，
• 每个DatabaseName的.bak和.trn，以及
• 日期<30天，日期> 30天 - 每个记录4个。

我想识别我桌子上> 30天的所有记录。

SELECT * FROM RestoreTests WHERE RestoreDate DATEDIFF(Day,RestoreDate, GETDATE()) > 30

我的语法：

declare @RestoreTestID int
declare @ServerName varchar(255)
declare @DatabaseName varchar(255)
declare @RestoreDate datetime
declare @BackupFile varchar(1000)
declare @id int

set @id = 0

select top 1 @RestoreTestID = RestoreTestID,
@ServerName = ServerName,
@DatabaseName = DatabaseName,
@RestoreDate = RestoreDate,
@BackupFile = BackupFile
from dbo.RestoreTests
where RestoreTestID > @id and DATEDIFF(DAY,RestoreDate, GETDATE()) > 30
order by RestoreTestID asc

while @@ROWCOUNT > 0
begin

    print 'loop RestoreTestID=' + cast(@RestoreTestID as varchar(255)) +
    ', ServerName=' + @ServerName +
    ', DatabaseName' + @DatabaseName +
    ', RestoreDate' + CAST(@RestoreDate as varchar(255)) +
    ', BackupFile' + @BackupFile

    set @id = @RestoreTestID

    select top 1 @RestoreTestID = RestoreTestID
    from dbo.RestoreTests
    where RestoreTestID > @id and DATEDIFF(DAY,RestoreDate, GETDATE()) > 30
    order by RestoreTestID 

结束

我收到错误消息：消息137，级别15，状态1，行1必须声明标量变量“@RestoreTestID”。消息137，级别15，状态2，行13必须声明标量变量“@RestoreTestID”。消息137，级别15，状态2，行19必须声明标量变量“@RestoreTestID”。消息137，级别15，状态1，行21必须声明标量变量“@RestoreTestID”。

当我在早些时候徘徊时，我确实得到了所有8个记录的结果集，而不是超过30天的4个记录。非常感谢任何提供的帮助！

Last Restore Syntax:
WITH LastRestores AS
(
SELECT
    DatabaseName = [d].[name] ,
    [d].[create_date] ,
    [d].[compatibility_level] ,
    [d].[collation_name] ,
    r.*,
    RowNum = ROW_NUMBER() OVER (PARTITION BY d.Name ORDER BY r.[restore_date] DESC)
FROM master.sys.databases d
LEFT OUTER JOIN msdb.dbo.[restorehistory] r ON r.[destination_database_name] = d.Name
)
SELECT * 
FROM [LastRestores]
WHERE [RowNum] = 1


select * from [dbo].[RestoreTests]

Answer 1

好的，我想出了我需要的东西。这是我到达的语法：

declare @RestoreTestID int
declare @id int
declare @ServerName varchar(255);
declare @DatabaseName varchar (255);
declare @RestoreDate datetime;
declare @BackupFile varchar (1000);

set @id = 0

select top 1 
    @RestoreTestID = RestoreTestID,
    @ServerName = ServerName,
    @DatabaseName = DatabaseName,
    @RestoreDate = RestoreDate,
    @BackupFile = BackupFile
from dbo.RestoreTests
where RestoreTestID > @id and RestoreDate <= DATEADD(day,-31,getdate())
order by RestoreTestID

while @@ROWCOUNT = 1
begin

    print 'RestoreTestID = ' + cast(@RestoreTestID as varchar(255)) +
    ', ServerName = ' + @ServerName +
    ', Databasename = ' + @DatabaseName +
    ', RestoreDate = ' + cast(@RestoreDate as varchar (255)) +
    ', BackupFile = ' + @BackupFile

    set @id = @RestoreTestID

    select top 1 @RestoreTestID = RestoreTestID 
    from dbo.RestoreTests
    where RestoreTestID > @id and RestoreDate <= DATEADD(day,-31,getdate())
    order by RestoreTestID 

end