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[p]我的目的是讓開發(fā)變得簡單，盡可能少地考慮實現(xiàn)語句，更多地把精力用于思考業(yè)務邏輯。希望我的文章對大家有所啟發(fā)和幫助。[/p]
[p]先看以下例子：[/p]
<%[br]db_path = "database/cnbruce.mdb"[br]set conn= server.createobject("adodb.connection")[br]connstr = "provider=microsoft.jet.oledb.4.0;data source="&server.mappath(db_path)[br]conn.open connstr[br]set rs = server.createobject ("adodb.recordset")[br]sql = "select * from cnarticle"[br]rs.open sql,conn,1,1[br]if rs.eof and rs.bof then[br]response.write ("暫時還沒有文章")[br]else[br]do until rs.eof[br]response.write("文章標題是:"& rs("cn_title"))[br]response.write("
文章作者是:"& rs("cn_author"))[br]response.write("
文章加入時間是:"& rs("cn_time"))[br]response.write("
文章內容是:"& rs("cn_content"))[br]response.write("

---

")[br]rs.movenext[br]loop[br]end if[br]rs.close [br]set rs = nothing[br]conn.close [br]set conn=nothing[br]%>
[p][br]嗯，這是一個典型的讀取數(shù)據(jù)并顯示的例子，參見：[url=http://cnbruce.com/blog/showlog.asp?cat_id=26&log_id=448]http://cnbruce.com/blog/showlog.asp?cat_id=26&log_id=448[/url][br]嗯，確實簡單。從上至下，很容易明白。但是當你對多個表進行讀插刪改的時候，當你的代碼里有很多html\js混雜的時候，你會有疑問：為什么有這么多東西要重復呢？[br]所以一般我們把一些簡單的操作獨立出來，寫成類或者函數(shù)放進包含文件(include)。[br][br]那么以上的操作我們可以使用兩個文件來實現(xiàn)：[br]conn.asp[/p]
<%[br]db_path = "database/cnbruce.mdb"[br]set conn= server.createobject("adodb.connection")[br]connstr = "provider=microsoft.jet.oledb.4.0;data source="&server.mappath(db_path)[br]conn.open connstr[br]%>
[p][br]showit.asp[/p]
[br]<%[br]set rs = server.createobject ("adodb.recordset")[br]sql = "select * from cnarticle"[br]rs.open sql,conn,1,1[br]if rs.eof and rs.bof then[br]response.write ("暫時還沒有文章")[br]else[br]do until rs.eof[br]response.write("文章標題是:"& rs("cn_title"))[br]response.write("
文章作者是:"& rs("cn_author"))[br]response.write("
文章加入時間是:"& rs("cn_time"))[br]response.write("
文章內容是:"& rs("cn_content"))[br]response.write("

---

")[br]rs.movenext[br]loop[br]end if[br]rs.close [br]set rs = nothing[br]conn.close [br]set conn=nothing[br]%>
[p][br]現(xiàn)在相對簡單多了，如果有多個操作頁面我們只要導入連接文件就可以了，不過還是不夠簡潔，哪里不簡潔？[br]一直在創(chuàng)建server，一直在寫close，這樣很容易出錯，并且看起來與內容無關的太多。[br][br]那我再改進下：[br]把conn.asp文件改成：[/p]
[p][/p]
<%[br]dim conn[br]dim rs[br]sub closedatabase[br] conn.close[br] set conn = nothing[br]end sub[br]sub opendatabase[br] dim strserver,struid,strsapwd,strdbname[br] strserver="192.168.1.1" '數(shù)據(jù)庫服務器名[br] struid="sa" '您的登錄帳號[br] strsapwd="" '您的登錄密碼[br] strdbname="cnbruce.mdb" '您的數(shù)據(jù)庫名稱[br] set conn = server.createobject("adodb.connection")[br] '用于連接access[br] conn.connectionstring = "provider=microsoft.jet.oledb.4.0; data source=" & server.mappath(strdbname)[br] '用于連接mssql[br] 'conn.connectionstring = "driver={sql server};driver={sql server};server="&strserver&";uid="&struid&";pwd="&strsapwd&";database="&strdbname[br] set rs=server.createobject("adodb.recordset")[br] conn.open[br] if err then[br] err.clear[br] set conn = nothing[br] gbl_chk_tempstr = gbl_chk_tempstr & "數(shù)據(jù)庫連接錯誤!"[br] response.write gbl_chk_tempstr[br] response.end[br] end if [br]end sub[br]%>
現(xiàn)在我們的showit.asp可以這樣寫：[br]showit.asp[br]
[br]<%[br]sql = "select * from cnarticle"[br]opendatabase[br]rs.open sql,conn,1,1[br]if not rs.eof then[br] do until rs.eof[br] response.write("文章標題是:"& rs("cn_title"))[br] response.write("
文章作者是:"& rs("cn_author"))[br] response.write("
文章加入時間是:"& rs("cn_time"))[br] response.write("
文章內容是:"& rs("cn_content"))[br] response.write("

---

")[br] rs.movenext[br] loop[br]else[br] response.write ("暫時還沒有文章")[br]end if[br]closedatabase[br]%>[br]嗯，我們又少寫了一些東西，這樣是最簡單的嗎？當然不是！還可以更簡單。[br]使用getrows把查詢出來的數(shù)據(jù)傳給一個變量，使用ubound方法取得數(shù)據(jù)記錄條數(shù)。[br]不明白？沒關系，讓我們繼續(xù)往下看：[br][br]再建個文件：sql.asp[br]sql.asp[br]
<%[br]class selectdatatable[br] public function selectdata(sql)[br] if sql<>"" then[br] opendatabase[br] rs.open sql,conn,1,1[br] if not rs.eof then[br] thedata=rs.getrows(-1)[br] closedatabase[br] else[br] closedatabase[br] end if[br] end if[br] selectdata=thedata[br] end function[br]end class[br]%>[br]嗯，復制它就可以了，現(xiàn)在我們的showit.asp可以簡單地這樣寫：[br][br]showit.asp[br]
[br][br]<%[br]sql = "select * from cnarticle"[br]set loaddata=new selectdatatable[br]thedata=loaddata.selectdata(sql)[br]if isarray(thedata) then[br] num=ubound(thedata,2)[br] for i=0 to num[br] response.write("文章標題是:"& thedata(1,i))[br] response.write("
文章作者是:"& thedata(2,i))[br] response.write("
文章加入時間是:"& thedata(3,i))[br] response.write("
文章內容是:"& thedata(4,i))[br] response.write("

---

")[br] next[br]else[br] response.write("暫時還沒有文章")[br]end if[br]%>[br]呵呵，這樣，我們只要用兩句語句就完成了數(shù)據(jù)的讀取。同樣的，通過在sql.asp中加入[br]
<%[br] public function selectdatanum(sql)[br] if sql<>"" then[br] opendatabase[br] rs.open sql,conn,1,1[br] if not rs.eof then[br] thedata=rs.getrows(-1)[br] closedatabase[br] num=ubound(thedata,2)[br] else[br] closedatabase[br] end if[br] end if[br] selectdatanum=num[br] end function[br]%>[br]我們就可以使用[br]
<%[br]sql = "select * from cnarticle"[br]set loaddata=new selectdatatable[br]num=loaddata.selectdatanum(sql)[br]%>[br]來取得記錄條數(shù)，可以用于分頁或者用戶名是否重復的判斷。[br][br]其它的對數(shù)據(jù)記錄的操作我們新建一個類,使用updatetable來完成操作：[br]
<%[br]class updatatable[br] public function updatasql(sql)[br] if sql<>"" then[br] opendatabase[br] conn.execute(sql)[br] closedatabase[br] end if[br] end function[br]end class[br]%>[br]
<%[br]sql = "delete from cnarticle"[br]set updatedate=new updatatable[br]updatedate.updatasql(sql)[br]%>
當然你也這以這樣寫：[br]
<%[br]sql="insert into cnarticle(cn_title,cn_author,cn_content) values(' "&whattitle&" ',' "&whoauthor&" ',' "&whatcontent&" ')"[br]opendatabase[br]conn.execute(sql)[br]closedatabase[br]%>[br]考慮到可能刪除語句我們會這么寫：[br]sql="delect from cnarticle where id in(1,3,5,6,7,8)"[br][br]我新建一個類deldatatable，直接使用deldatatable.deldatasql(tablename,delfield,id)完成記錄的刪除操作。[br]
<%[br]class deldatatable[br] dim tempvalue[br] public function deldatasql(tablename,delfield,id)[br] if tablename<>"" and id<>"" then[br] sql="delete from "&tablename[br] if isnumeric(id) and instr(id,",")=0 then[br] sql = sql & " where "&delfield&" = "&id[br] else[br] sql = sql & " where "&delfield&" in ("& id &")"[br] end if[br] opendatabase[br] conn.execute(sql)[br] closedatabase[br] tempvalue=true[br] else[br] tempvalue=false[br] end if[br] deldatasql=tempvalue[br] end function[br]end class[br]%>[br]以下是我的sql.asp文件，請自己進行增刪[br]復制代碼
<%[br]'用于查詢數(shù)據(jù)[br]class selectdatatable[br] '查出記錄[br] public function selectdata(sql)[br] if sql<>"" then[br] opendatabase[br] rs.open sql,conn,1,1[br] if not rs.eof then[br] thedata=rs.getrows(-1)[br] closedatabase[br] else[br] closedatabase[br] end if[br] end if[br] selectdata=thedata[br] end function[br] '查出記錄條數(shù)[br] public function selectdatanum(sql)[br] if sql<>"" then[br] opendatabase[br] rs.open sql,conn,1,1[br] if not rs.eof then[br] thedata=rs.getrows(-1)[br] closedatabase[br] num=ubound(thedata,2)[br] else[br] closedatabase[br] end if[br] end if[br] selectdatanum=num[br] end function[br] '使用select count(*) from tablename 查出記錄有數(shù)[br] public function selectcountnum(sql)[br] if sql<>"" then[br] opendatabase[br] rs.open sql,conn,1,1[br] if not rs.eof then[br] thedata=rs.getrows(-1)[br] closedatabase[br] num=thedata(0,0)[br] else[br] closedatabase[br] end if[br] end if[br] selectcountnum=num[br] end function[br] '將查詢的數(shù)據(jù)全部生成隱藏值[br] public function gethiddendata(sql)[br] dim tempvalue[br] if sql<>"" then[br] opendatabase[br] rs.open sql,conn,1,1[br] if not rs.eof then[br] thedata=rs.getrows(-1)[br] thefieldcount=rs.fields.count[br] for i=0 to thefieldcount-1[br] thefieldlist = thefieldlist & rs.fields(i).name & ","[br] next[br] closedatabase[br] thefield = split(thefieldlist,",")[br] for i=0 to thefieldcount-1[br] tempvalue = tempvalue & ""[br] next[br] else[br] closedatabase[br] end if[br] end if[br] gethiddendata=tempvalue[br] end function[br] [br]end class[br]class updatatable[br] public function updatasql(sql)[br] if sql<>"" then[br] opendatabase[br] conn.execute(sql)[br] closedatabase[br] end if[br] end function[br] [br]end class[br]class deldatatable[br] dim tempvalue[br] public function deldatasql(tablename,delfield,id)[br] if tablename<>"" and id<>"" then[br] sql="delete from "&tablename[br] if isnumeric(id) and instr(id,",")=0 then[br] sql = sql & " where "&delfield&" = "&id[br] else[br] sql = sql & " where "&delfield&" in ("& id &")"[br] end if[br] opendatabase[br] conn.execute(sql)[br] closedatabase[br] tempvalue=true[br] else[br] tempvalue=false[br] end if[br] deldatasql=tempvalue[br] end function[br]end class[br]%>