在线等!!!数据库连接的问题(sql server2000)!!

 1   
 2strusername=trim(Request("username"))   
 3strSQL = "select * from admin where username='"&strusername&"'"   
 4strCon = "driver={SQL Server};server=localhost;uid=SA;pwd=123;database=fis" '此句和下面都行!   
 5strCon = "Provider=SQLOLEDB.1;Persist Security Info=False;User ID=sa;pwd=123;Initial Catalog=fis;Data Source=LYT"   
 6Set con = Server.CreateObject("adodb.connection")   
 7con.Open(strCon)   
 8Set rs = Server.CreateObject("adodb.recordset")   
 9rs.Open strSQL,strcon,adOpenKeyset,adOpenStatic,adCmdText   
10If rs.EOF Then   
11Response.Write("没有记录")   
12Else   
13Response.Write(rs("username"))   
14strName = "lyt"   
15rs.AddNew   
16rs("username") = strName   
17rs.Update   
18End If   

以前运行都是正确的现在不知怎么了只要一执行rs.update就出错了,错误如下:
Microsoft OLE DB Provider for SQL Server (0x80040E2F)
/GP_OA_NEW/login/checkpass2.asp, 第 18 行
我以前是SQL7。0现在改用2000怎么也不行,请帮忙!!!!两种连接字符串以前都是可以的!!
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admin表中是否有字段不允许为空?
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1、rs.Open strSQL,strcon,adOpenKeyset,adOpenStatic,adCmdText
改成:rs.Open strSQL,con,adOpenKeyset,adOpenStatic,adCmdText
2、检查你的数据表admin,查看是否有不允许为NULL的字段,是否有限制长度的字段
3、检查你赋值给rs时,类型是否相符
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把rs.Open strSQL,strcon,adOpenKeyset,adOpenStatic,adCmdText改为:
rs.Open strSQL,con,1,3
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strCon = "Provider=SQLOLEDB.1;Persist Security Info=False;User ID=sa;pwd=123;Initial Catalog=fis;Data Source=LYT"
Set con = Server.CreateObject("adodb.connection")
con.Open(strCon)

sql="update admin set username="&strname&""

set rs=server.createobject("adodb.command")
rs.activeconnection=con
rs.commandtext=sql_hit
rs.execute ,,adexecutenorecords
set rs=nothing

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sql_hit改成sql
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user_id是不允许为空的是递增的

你的那个user_id是自增变量吧,看看你的sql2000有没有设成自增
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