数据更新问题，请进！

[zapzap]

帮我看一下这个错误呀
我想让在删除一个表的一条条记录之前，先把另一个表的记录更新，出现了错误


原代码是这样的：

<!--#include file="conn1.asp"-->
<%
id=trim(request("id"))
if id<>"" then
set rs=server.createobject("adodb.recordset")
rs.open"select* from fenpei where id="&id,con,1,3
if rs.eof then
response.write"have no!"
response.end
con.close
else
shuliang=rs("shuliang")
intrname=rs("intrname")

sql="update introduction set shengyu=shengyu"&+shuliang&" where intrname='"&intrname&"'"
(错误行)　　con.execute sql
rs.delete
rs.update
response.write"删除成功！"
response.write"修改成功！"
con.close
end if
else
response.write"不能为空！"
response.end
end if
%>

[angelheavens]

sql="update introduction set shengyu=(shengyu+"&shuliang&") where intrname='"&intrname&"'"
con.execute(sql)

[dafei0320]

一个字段要秒加()

sql="update introduction set shengyu=(shengyu+"&shuliang&") where intrname='"&intrname&"'"
con.execute(sql)

[xupiao]

sql="update introduction set shengyu=(shengyu+"&shuliang&") where intrname='"&intrname&"'"