我写了一个存储过程，它作为一组数据库备份进行恢复。它有两个参数——一个源目录和一个恢复目录。该过程查找源目录中的所有 .bak 文件（递归）并恢复所有数据库。
存储过程按预期工作，但它有一个问题 - 如果我取消注释 try-catch 语句，该过程将终止并出现以下错误：
error_number = 3013
error_severity = 16
error_state = 1
error_message = DATABASE is terminating abnormally.
奇怪的部分有时（不一致）即使发生错误也会完成还原。步骤：
create proc usp_restore_databases
(
@source_directory varchar(1000),
@restore_directory varchar(1000)
)
as
begin
declare @number_of_backup_files int
-- begin transaction
-- begin try
-- step 0: Initial validation
if(right(@source_directory, 1) <> '\') set @source_directory = @source_directory + '\'
if(right(@restore_directory, 1) <> '\') set @restore_directory = @restore_directory + '\'
-- step 1: Put all the backup files in the specified directory in a table --
declare @backup_files table ( file_path varchar(1000))
declare @dos_command varchar(1000)
set @dos_command = 'dir ' + '"' + @source_directory + '*.bak" /s/b'
/* DEBUG */ print @dos_command
insert into @backup_files(file_path) exec xp_cmdshell @dos_command
delete from @backup_files where file_path IS NULL
select @number_of_backup_files = count(1) from @backup_files
/* DEBUG */ select * from @backup_files
/* DEBUG */ print @number_of_backup_files
-- step 2: restore each backup file --
declare backup_file_cursor cursor for select file_path from @backup_files
open backup_file_cursor
declare @index int; set @index = 0
while(@index < @number_of_backup_files)
begin
declare @backup_file_path varchar(1000)
fetch next from backup_file_cursor into @backup_file_path
/* DEBUG */ print @backup_file_path
-- step 2a: parse the full backup file name to get the DB file name.
declare @db_name varchar(100)
set @db_name = right(@backup_file_path, charindex('\', reverse(@backup_file_path)) -1) -- still has the .bak extension
/* DEBUG */ print @db_name
set @db_name = left(@db_name, charindex('.', @db_name) -1)
/* DEBUG */ print @db_name
set @db_name = lower(@db_name)
/* DEBUG */ print @db_name
-- step 2b: find out the logical names of the mdf and ldf files
declare @mdf_logical_name varchar(100),
@ldf_logical_name varchar(100)
declare @backup_file_contents table
(
LogicalName nvarchar(128),
PhysicalName nvarchar(260),
[Type] char(1),
FileGroupName nvarchar(128),
[Size] numeric(20,0),
[MaxSize] numeric(20,0),
FileID bigint,
CreateLSN numeric(25,0),
DropLSN numeric(25,0) NULL,
UniqueID uniqueidentifier,
ReadOnlyLSN numeric(25,0) NULL,
ReadWriteLSN numeric(25,0) NULL,
BackupSizeInBytes bigint,
SourceBlockSize int,
FileGroupID int,
LogGroupGUID uniqueidentifier NULL,
DifferentialBaseLSN numeric(25,0) NULL,
DifferentialBaseGUID uniqueidentifier,
IsReadOnly bit,
IsPresent bit
)
insert into @backup_file_contents
exec ('restore filelistonly from disk=' + '''' + @backup_file_path + '''')
select @mdf_logical_name = LogicalName from @backup_file_contents where [Type] = 'D'
select @ldf_logical_name = LogicalName from @backup_file_contents where [Type] = 'L'
/* DEBUG */ print @mdf_logical_name + ', ' + @ldf_logical_name
-- step 2c: restore
declare @mdf_file_name varchar(1000),
@ldf_file_name varchar(1000)
set @mdf_file_name = @restore_directory + @db_name + '.mdf'
set @ldf_file_name = @restore_directory + @db_name + '.ldf'
/* DEBUG */ print 'mdf_logical_name = ' + @mdf_logical_name + '|' +
'ldf_logical_name = ' + @ldf_logical_name + '|' +
'db_name = ' + @db_name + '|' +
'backup_file_path = ' + @backup_file_path + '|' +
'restore_directory = ' + @restore_directory + '|' +
'mdf_file_name = ' + @mdf_file_name + '|' +
'ldf_file_name = ' + @ldf_file_name
restore database @db_name from disk = @backup_file_path
with
move @mdf_logical_name to @mdf_file_name,
move @ldf_logical_name to @ldf_file_name
-- step 2d: iterate
set @index = @index + 1
end
close backup_file_cursor
deallocate backup_file_cursor
-- end try
-- begin catch
-- print error_message()
-- rollback transaction
-- return
-- end catch
--
-- commit transaction
end
有人知道为什么会发生这种情况吗？
另一个问题：交易代码有用吗？即如果有2个数据库要恢复，如果第二次恢复失败，SQL Server会撤消一个数据库的恢复吗？