SQL每日还原

Question

尝试并未能编写每天恢复SQL数据库备份文件的脚本。

文件备份采用以下格式Backup_28_04_2020。我需要脚本来获取最新文件并将其还原到名为[CallDatabase]的数据库中。它的日期让我失望，因为它每天都在变化。

感谢任何帮助。

DB是SQL Server 2016。

我正在下面尝试的脚本。脚本正在解析，但失败，并出现以下错误。

“将数据类型varchar转换为nvarchar时出错。[SQLSTATE 42000]（错误8114）。该步骤失败。“

DECLARE @FileName varchar(255), @PathToBackup varchar(255), @RestoreFilePath varchar(1000)
DECLARE @Files TABLE (subdirectory varchar(255), depth int, [file] int)
 SET NOCOUNT ON

 SET @PathToBackup = 'H:\'

 -- insert into our memory table using dir tree and a single file level
 INSERT INTO @Files
 EXEC master.dbo.xp_DirTree @PathToBackup,1,1

 SELECT TOP 1 
    @FileName = [subdirectory]
 FROM 
    @Files
 WHERE
    -- get where it is a file
    [file] = 1
 AND    
    subdirectory LIKE 'Backup_%.bak'
 ORDER BY
    -- order descending so newest file will be first by naming convention
    subdirectory DESC

IF LEFT(REVERSE(@PathToBackup), 1) != '\'
BEGIN
    SET @PathToBackup = @PathToBackup + '\'
END

SET @RestoreFilePath = @PathToBackup + @FileName

SELECT @RestoreFilePath

RESTORE DATABASE [CallDatabase] 
FROM DISK = @RestoreFilePath
WITH FILE = 1,  NOUNLOAD,  REPLACE,  STATS = 10

Answer 1

我认为您在还原数据库时需要提供更多详细信息。另外，将delcare @RestoreFilePath设置为nvarchar (1000)：

DECLARE @DBNAME SYSNAME = 'CallDatabase'    --'DBName'
DECLARE @DATA NVARCHAR(MAX) = 'H:\' + @DBNAME + '.mdf'    --'Path of data file'
DECLARE @LOG NVARCHAR(MAX) = 'H:\' + @DBNAME + '.ldf'     --'Path of log file'

RESTORE DATABASE [CallDatabase] 
FROM DISK = @RestoreFilePath
WITH FILE = 1,  
MOVE N'CallDatabase_Data' TO @DATA,  
MOVE N'CallDatabase_Log' TO @LOG, 
NOUNLOAD,  REPLACE,  STATS = 10

HTH。