选择具有最新时间戳

Question

.bak文件，我想一个数据库备份文件名.bak恢复到服务器，但也有不同的时间戳几.bak文件，例如：

dbname_backup_201210290200.bak
dbname_backup_201210300212.bak
dbname_backup_201210310213.bak

Answer 1

假设xp_cmdshell的启用，所有文件将yyyyMMddhhmm.bak结束：

CREATE TABLE #x(n VARCHAR(2048)); 

DECLARE @cmd VARCHAR(2048), @fn VARCHAR(2048), @folder VARCHAR(255); 

SET @folder = 'E:\sqlbackup\MerchantAPIReport\'; --' 
SET @cmd = 'dir /b "' + @folder + 'MerchantAPIReport_backup_*.bak"'; 

INSERT #x EXEC master..xp_cmdshell @cmd; 

SELECT TOP (1) @fn = @folder + n 
    FROM #x 
    ORDER BY CONVERT(DATETIME, 
    STUFF(STUFF(LEFT(RIGHT(n, 16), 12), 11, 0, ':'), 9, 0, ' ')) 
    DESC; 

-- whatever you do, don't try to construct this yourself. 
-- I'll fill in the blanks for you. <sigh> 

RESTORE DATABASE [MerchantAPIReport] FROM DISK = @fn 
    WITH FILE = 1, 
    MOVE N'MerchantAPIReport'  TO N'D:\SQLData01\MerchantAPIReport.mdf', 
    MOVE N'MerchantAPIReport_log' TO N'F:\SQLLog\MerchantAPIReport.ldf', 
    NOUNLOAD, REPLACE, STATS = 10; 

-- RESTORE DATABASE ... FROM @fn ...; -- fill in the rest here 

DROP TABLE #x;