替换SQL Server数据库中所有表的所有字段的某些内容

--数据库表中内容替换
declare @str varchar(500),@str2 varchar(500)
--这里是你要替换的原字符 
set @str='防火'
--这里是你要替换的新字符 
set @str2='FH'

declare @table varchar(255),@column varchar(255)
declare table_cursor cursor for
   select a.name,b.name from sysobjects a,syscolumns b,systypes c
   where a.id=b.id and b.xtype=c.xtype and a.xtype='u' and c.name in ('nvarchar','varchar') 
   and a.name in ('student','student_score')

open table_cursor fetch next from table_cursor into @table,@column
while @@fetch_status=0 
begin
 exec('update [' + @table + '] set [' + @column + ']=replace(cast([' + @column + '] as varchar(8000)),'''+@str+''','''+ @str2 +''')') 
    fetch next from table_cursor into @table,@column
end
close table_cursor 
deallocate table_cursor;