批量删除数据库的SQL语句

由于项目需要，每次运行case的时候都需要创建数据库。虽然每次执行结束都会删除，但是不保证每次都能删除成功（这里有许多原因，我就不列举了）。所以我写了个脚本去批量删除数据库。首先为确保我们的数据库是有用的，不被错删除的。所以就必须先备份在删除。

备份数据库：

DECLARE @name VARCHAR(50) -- database name  
DECLARE @path VARCHAR(256) -- path for backup files  
DECLARE @fileName VARCHAR(256) -- filename for backup  
DECLARE @fileDate VARCHAR(20) -- used for file name 

SET @path = 'D:\ABC\Backup\'  

SELECT @fileDate = CONVERT(VARCHAR(20),GETDATE(),112) 

DECLARE db_cursor CURSOR FOR  
SELECT name 
FROM MASTER.dbo.sysdatabases 
WHERE name IN ('E2DB_ABC','Scheduler')  


OPEN db_cursor   

FETCH NEXT FROM db_cursor INTO @name   

WHILE @@FETCH_STATUS = 0   
BEGIN  
 SET @fileName = @path + @name + '_' + @fileDate + '.BAK'  
       BACKUP DATABASE @name TO DISK = @fileName  
 
       FETCH NEXT FROM db_cursor INTO @name   
END   

CLOSE db_cursor   
DEALLOCATE db_cursor

方法1：

DECLARE @path VARCHAR(256) -- path for backup files  
DECLARE @fileName VARCHAR(256) -- filename for backup  
DECLARE @fileDate VARCHAR(20) -- used for file name 

SET @path = 'D:\Backup\'  

SELECT @fileDate = CONVERT(VARCHAR(20),GETDATE(),112) 

DECLARE db_cursor CURSOR FOR  
SELECT name 
FROM MASTER.dbo.sysdatabases 
WHERE name NOT IN ('master','model','msdb','tempdb','ReportServer'  

OPEN db_cursor   
DECLARE @databasename VARCHAR(50) -- database name  
DECLARE @databaseCount int =0

FETCH NEXT FROM db_cursor INTO @databasename  

WHILE @@FETCH_STATUS = 0   
BEGIN  
	DECLARE @statement nvarchar(50)
	print 'dropping databse: '+@databaseName

	exec('
	use master
	alter database '+@databaseName+' set single_user with rollback immediate
	drop database '+@databaseName)
	set	@databaseCount=@databaseCount+1

    FETCH NEXT FROM db_cursor INTO @databasename   
END  

print 'dropped databse count: '+CONVERT(VARCHAR(12),@databaseCount )

CLOSE db_cursor  
DEALLOCATE db_cursor

declare @dbToDelete table(name varchar(50))
declare @databaseName varchar(100)

insert into @dbToDelete values('ABC')
insert into @dbToDelete values('DEF')
insert into @dbToDelete values('GH')
insert into @dbToDelete select name from Master..SysDatabases where name like 'ABC%'

while exists(select name from @dbToDelete)
begin

select top 1 @databaseName=name from @dbToDelete

if exists(select * from sys.databases where name = @databaseName)
begin
print 'dropping databse: '+@databaseName

exec('
use master
alter database '+@databaseName+' set single_user with rollback immediate
drop database '+@databaseName)
end

delete from @dbToDelete where name = @databaseName

end