发一个ASP的ADODB类代码

反正我现在用这个做了很多站，自己觉得还是满有用的，所以拿出来和大家分享一下。支持三种数据库连接：mssql2000，mssql2005，access
三种方法：
select_table(sql)
表查询，返回true或false
当sql语句出错，或空记录时返回false，否则true
update_table(sql)
表更新，包括update,delete
成功执行返回true，否则返回false，updated为执行后影响记录行数。
insert_table(sql,table,id_column)
table为表名，id_column为表中自动编号，自增字段。
当成功执行返回true，否则返回false，指定table，id_column后，将返回最后添加记录所产生的自增id。

select_table()相关方法select_page(page,psize)
分页处理，page为当前页，psize为每页记录行数。
所有操作时，自动检测数据库链接和rs是否打开，执行后将自动关闭数据库链接。

示例：
set db = new adodb_class
if db.select_table("select * from news order by id desc") then
   page = request("page")
   select_page(page,20)'每页20条
   for i=1 to 20 
          response.write db.rs("title")'类内置rs，不可变
    db.rs.movenext
   if db.rs.eof then exit for
   next
end if
db.rspage = 总页数，db.nowpage= 经过处理后当前页，db.rscounts数总记录数量。

if db.update_table("delete from news where ispass=1") then'update同样
    response.write "共删除"&db.updated&"行"
end if

call db.insert_table("insert into news (title,content) values ('"&title&"','"&content&"')","news","id")
response.write "最后添加id为"&db.insertd

在页面最尾可输出db.readcounts 为查询数据库次数。
--------------------------------------------
本类好处就是你不必担心忘记关闭数据库链接，不用频繁set rs = server.recordset("adodb.recordset"),也不用set rs = nothing
缺点就是翻页用的传统方式。rs.absolutepage = rs.pagesize
----------------------------------------------------------
<%
'/******kshop******/
'        adodb_class.asp        数据库操作类

'        version                1.0
'        copyright        [email][e-mail][/email]
'        e-mail                [email][e-mail][/email]
'/*****************/
class adodb_class
        dim conn,connstr,rs
        dim dbclass'数据库类型access,sql2000,sql2005三个值之一
        dim sqldbname,sqluser,sqlpass,sqlserver
        dim sqlaccess
        dim selectd,insertd,updated
        dim rscounts,rspage,readcounts,nowpage '记录集 总数/页数 查询次数

        private sub class_initialize()
                        sqldbname        = ""
                        sqluser                = ""
                        sqlpass                = ""
                        sqlserver        = ""
                        sqlaccess         = "/simple_date/simple_xiehui.mdb"
                        rscounts = 0:rspage = 1:readcounts = 0:nowpage = 1
                        call openconn("access")

                        selectd                = 0
                        insertd                = 0
                        updated                = 0
        end sub
        '********打开数据库链接******************
        private sub accessconn()
                        connstr="provider=microsoft.jet.oledb.4.0;data source=" & server.mappath(sqlaccess) &";persist security info=false"
        end sub
        private sub sql2kconn()
                        connstr = "driver={sql server};server="&sqlserver&";uid="&sqluser&";pwd="&sqlpass&";database="&sqldbname
        end sub
        private sub sql2k05conn()
                        connstr="provider=sqlncli.1;password="&sqlpass&";user id="&sqluser&";initial catalog="&sqldbname&";data source="&sqlserver
        end sub
        private sub openconn(db_class)
                        dbclass = db_class
                        select case db_class
                                case "access":call accessconn()
                                case "sql2000":call sql2kconn()
                                case "sql2005":call sql2k05conn()
                        end select
                        on error resume next
                        set conn = server.createobject("adodb.connection")
                        conn.open connstr
                        if err then
                                response.write "数据库链接失败<br>sqlstring = " + connstr
                                response.end()
                                err.clear
                        end if
        end sub
        '**********结束/查询构造*************
        public function select_table(sql)
                        if not not isempty(conn) or isnull(conn) then
                                        call openconn(dbclass)
                                elseif conn.state = 0 then
                                        call openconn(dbclass)
                        end if
                        on error resume next
                        set rs = server.createobject("adodb.recordset")
                        rs.open sql,conn,1,1
                        if err then
                                select_table = false
                                rs.close
                                exit function
                                err.clear
                        end if
                        if rs.eof and rs.bof then
                                        rs.close
                                        select_table = false
                                else
                                        select_table = true
                        end if
                        readcounts = readcounts + 1
        end function
        '分页处理
        public function select_page(page,psize)
                        if isnull(page) or page = "" then page = 1
                        if page < 1 then page = 1
                        if rs.state = 1 then
                                if not rs.eof then
                                        rs.pagesize = psize
                                        rspage = rs.pagecount
                                        rscounts = rs.recordcount
                                        if int(page) > int(rspage) then page = rspage
                                        rs.absolutepage = page:nowpage = page
                                end if
                        end if                
        end function
        '更新记录
        public function update_table(sql)
                        if not isempty(conn) or isnull(conn) then
                                        call openconn(dbclass)
                                elseif conn.state = 0 then
                                        call openconn(dbclass)
                        end if
                        on error resume next
                        if sql <> "" then
                                conn.execute sql,updated
                                if err then
                                                update_table = false
                                                err.clear
                                        else
                                                update_table = true
                                end if
                        else
                                update_table = false
                        end if
                        conn.close
                        set conn = nothing
        end function
        '增加
        '输入：insert sql语句，表名，自增字段
        public function insert_table(sql,table,id_column)
                        if not isempty(conn) or isnull(conn) then
                                        call openconn(dbclass)
                                elseif conn.state = 0 then
                                        call openconn(dbclass)
                        end if
                        on error resume next
                        if sql <> "" then
                                conn.execute(sql)
                                if err then
                                                insert_table = false:err.clear
                                        else
                                                insert_table = true
                                end if
                                '获得最后增加id
                                if table <> "" and id_column <> "" then
                                        set ds = conn.execute("select "&id_column&" from "&table&" order by "&id_column&" desc")
                                end if
                                if err then 
                                                insertd = 0:err.clear
                                        else insertd = ds(0)
                                end if
                                set ds = nothing
                                closed()
                        else
                                insert_table = false
                        end if
        end function
        '关闭数据库链接
        public function closed()
                        if not isempty(rs) and not isnull(rs) then
                                if rs.state = 1 then
                                        rs.close
                                end if
                        end if
                        rscounts = 0:rspage = 1:nowpage = 1
        end function
        '**********释放类************
        private sub class_terminate() 
                        readcounts = 0:rscounts = 0:rspage = 0
                        if not isempty(conn) and not isnull(conn) then
                                if conn.state = 1 then
                                        conn.close
                                end if
                                set conn = nothing
                        end if

                        if not isempty(rs) then
                                if not isnull(rs) then
                                        if rs.state=1 then 
                                                rs.close
                                        end if
                                        set rs=nothing
                                end if                        
                        end if
        end sub
end class
%>