网上找资料发现的，但是调试的时候发现有一些问题，
改了一下，还有一定的问题，但是可以做一般使用了。
没有考虑数据类型的问题，还有SQL Server 和access的区别，以后有时间再改进吧，不知道效率怎么样。
如果有朋友改进，也麻烦给我发一份。
<%
\'生成SQL字符串的类。
class SQLString
\'************************************
\'变量定义
\'************************************
\'sTableName ---- 表名
\'iSQLType ----SQL语句类型：0-增加，1-更新，2-删除,3-查询
\'sWhere ---- 条件
\'sOrder ---- 排序方式
\'sSQL ----值

Private sTableName,iSQLType,sWhere,sOrder,sSQL

\'************************************
\'类初始化/结束
\'************************************

Private Sub Class_Initialize()
sTableName=""
iSQLType=0
sWhere=""
sOrder=""
sSQL=""
End Sub

Private Sub Class_Terminate()

End Sub

\'************************************
\'属性
\'************************************
\'设置表名的属性
Public Property Let TableName(value)
sTableName=value
End Property
\'设置条件
Public Property Let Where(value)
sWhere=value
End Property
\'设置排序方式
Public Property Let Order(value)
sOrder=value
End Property
\'设置查询语句的类型

Public property Let SQLType(value)
iSQLType=value
select case iSQLType
case 0
sSQL="insert into #0 (#1) values (#2)"
case 1
sSQL="update #0 set #1=#2"
case 2
sSQL="delete from #0 "
case 3
sSQL="select #1 from #0 "
end select
End Property

\'************************************
\'函数
\'************************************
\'增加字段（字段名称，字段值）

Public Sub AddField(sFieldName,sValue)
select case iSQLType
case 0
sSQL=replace(sSQL,"#1",sFieldName & ",#1")
sSQL=replace(sSQL,"#2","\'" & sValue & "\',#2")
case 1
sSQL=replace(sSQL,"#1",sFieldName)
sSQL=replace(sSQL,"#2","\'" & sValue & "\',#1=#2")
case 3
sSQL=replace(sSQL,"#1",sFieldName & ",#1")
End Select
End Sub

\'返回SQL语句
Public Function ReturnSQL()
sSQL=replace(sSQL,"#0",sTableName)
select case iSQLType
case 0
sSQL=replace(sSQL,",#1","")
sSQL=replace(sSQL,",#2","")
case 1
sSQL=replace(sSQL,",#1=#2","")
case 3
sSQL=replace(sSQL,",#1","")
end Select
if sWhere<>"" and iSQLType<>0 then
sSQL=sSQL & " where " & sWhere
end if
if sOrder<>"" and iSQLType<>0 then
sSQL=sSQL & " order by " & sOrder
end if
ReturnSQL=sSQL
End Function

\'清空语句

Public Sub Clear()
sTableName=""
iSQLType=0
sWhere=""
sOrder=""
sSQL=""
End Sub
End class
%>

<%
\'下面是调用的例子，数据类型的问题请继续修改上面的类里的定义，如果有问题可以问我
set a =new SQLString \'创建类对象
a.TableName=" message " \'设置表名为message
\'a.where=" issend =9"
\'a.order=" issend desc"
a.SQLType=0 \'设置查询类型为增加记录
a.AddField " incept", "2"
a.AddField " sender ", " 3 "
a.AddField " title ", " 4 "
a.AddField " sender ", "5 "
a.AddField " content ", " 6 "
a.AddField " sendtime ", "7"
a.AddField " flag", 8
a.AddField " issend ", 9

Response.Write a.ReturnSQl
set a=nothing
%>