为什么我输出的值还是为msg_str,,,请各位高手帮一下,,在线等

sql22="select top 12 * from music1 order by postid desc"

  set rs22=server.createobject("adodb.recordset")

  rs22.open sql22,conn,1,1
   
  dim msg_str
do while not rs22.eof

   
msg_str=msg_str& ""&rs22( "content" )&""
  
rs22.movenext
loop
  response.Write("msg_str")

结果还是msg_str,数据库里的值没读出来，代码要怎样写才能输出值

response.Write msg_str