網(wǎng)上找資料發(fā)現(xiàn)的，但是調(diào)試的時(shí)候發(fā)現(xiàn)有一些問(wèn)題，
改了一下，還有一定的問(wèn)題，但是可以做一般使用了。
沒(méi)有考慮數(shù)據(jù)類(lèi)型的問(wèn)題，還有SQL Server 和access的區(qū)別，以后有時(shí)間再改進(jìn)吧，不知道效率怎么樣。
如果有朋友改進(jìn)，也麻煩給我發(fā)一份。
<%
'生成SQL字符串的類(lèi)。
'原作：無(wú)名氏
'改進(jìn)：aloxy
'E-mail:[email protected]
'OICQ:331622229
class SQLString
'************************************
'變量定義
'************************************
'sTableName ---- 表名
'iSQLType ----SQL語(yǔ)句類(lèi)型：0-增加，1-更新，2-刪除,3-查詢(xún)
'sWhere ---- 條件
'sOrder ---- 排序方式
'sSQL ----值

Private sTableName,iSQLType,sWhere,sOrder,sSQL

'************************************
'類(lèi)初始化/結(jié)束
'************************************

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

Private Sub Class_Terminate()

End Sub

'************************************
'屬性
'************************************
'設(shè)置表名的屬性
Public Property Let TableName(value)
sTableName=value
End Property
'設(shè)置條件
Public Property Let Where(value)
sWhere=value
End Property
'設(shè)置排序方式
Public Property Let Order(value)
sOrder=value
End Property
'設(shè)置查詢(xún)語(yǔ)句的類(lèi)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

'************************************
'函數(shù)
'************************************
'增加字段（字段名稱(chēng)，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語(yǔ)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

'清空語(yǔ)句

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

<%
'下面是調(diào)用的例子，數(shù)據(jù)類(lèi)型的問(wèn)題請(qǐng)繼續(xù)修改上面的類(lèi)里的定義，如果有問(wèn)題可以問(wèn)我
set a =new SQLString '創(chuàng)建類(lèi)對(duì)象
a.TableName=" message " '設(shè)置表名為message
'a.where=" issend =9"
'a.order=" issend desc"
a.SQLType=0 '設(shè)置查詢(xún)類(lèi)型為增加記錄
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
%>