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使用组件封装数据库操作(二)_asp技巧
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发布于：2011-01-26 22:20
 | |  |  | 前段日子发表的文章，数据库的连接代码能直接在ASP文件中显示出来。这次又进行了一次封装。打开vb，新建Activex控件，工程名称为webDb，类模块名称为GetInfomation引用”Microsoft Activex Data Object 2.6 Library ”Private Conn As ADODB.ConnectionPrivate Rs As ADODB.Recordset‘作用:判断数据库是否正确连结自己能更改连接串Public Function GetConn()Conn.Open "Provider=SQLOLEDB.1;Persist Security Info=False;User ID=sa;Initial Catalog=Northwind;Data Source=yang"If Err.Number <> 0 Then GetConn = FalseElse GetConn = TrueEnd IfEnd Function‘根据输入的雇员ID,得到雇员的名称Public Function GetEmployeeName(strEmployeeID As Integer) As String Dim strSql As String Set rs = New ADODB.Recordset strSql = "select LastName+firstname from employees where EmployeeID=" ; strEmployeeID rs.Open strSql, Conn, adOpenStatic, adLockOptimistic If rs.EOF Then GetEmployeeName = "" Else GetEmployeeName = rs.Fields(0) End If rs.CloseEnd Function‘返回所有的雇员列表Public Function GetEmployeeList() As ADODB.Recordset Dim strSql As String Set rs = New ADODB.Recordset strSql = "select EmployeeID,LastName,FirstName,Title,TitleOfCourtesy,BirthDate,HireDate,Address,City from employees" rs.CursorLocation = adUseClient rs.Open strSql, Conn, adOpenStatic Set GetEmployeeList = rs rs.CloseEnd Function 我们进行测试新建ASP页面，”TestWebDb1.asp”。主要用来测试GetEmployeeList()方法<HEAD> <!- 测试页 -><!- 功能：测试组件 -><!- 作者：龙卷风.NET -> <% Dim strTopic Dim strTitle Dim strContents Dim DataQuery Dim Rs Dim Myself Myself=Request.ServerVariables("script_name") Set DataQuery=Server.CreateObject("WebDb.GetInfomation") Set Rs=Server.CreateObject("adodb.recordset") %><TITLE> 数据组件测试页</TITLE><H1><CENTER>欢迎使用数据组件(www.knowsky.com)</CENTER></H1><% Dim Flag Flag=DataQuery.GetConn() If Flag=false then ResPonse.Write "数据库没有连结,请检查" ResPonse.End End if Set Rs=DataQuery.GetEmployeeList() if rs.eof then Response.write "没有数据,请查询" Response.end end if Rs.PageSize =3 Page= CLng(Request.QueryString ("Page")) If Page < 1 Then Page = 1 If Page > Rs.PageCount Then Page = Rs.PageCount Response.Write "<CENTER><TABLE BORDER=1 cellspacing=0 cellpadding=2>" Response.Write "<tr BGCOLOR=silver align=center>" Response.Write "<td>EmployeeID</TD>" Response.Write "<td>LastName</td>" Response.Write "<td>FirstName</td>" Response.Write "<td>Title</a></td>" Response.Write "<td>TitleOfCourtesy</a></td>" Response.Write "<td>BirthDate</td>" Response.Write "<td>HireDate</td>" Response.Write "<td>Address</td>" Response.Write "<td>City</td>" Response.Write "</tr>" Rs.AbsolutePage = Page For iPage = 1 To Rs.PageSize Response.Write "<TR align=right>" for i=0 to Rs.fields.count-1 Response.Write "<td>";Rs.fields.item(i);"</td>" next Response.Write "</TR>" Rs.MoveNext If Rs.EOF Then Exit For next Response.Write "</TABLE></CENTER>"%> <Form name="myform" method="get"><%If Page <> 1 Then%> <A HREF="<%=Myself%>?Page=1">第一页</A> <A HREF="<%=Myself%>?Page=<%=(Page-1)%>">上一页</A><%End If%> <%If Page <> Rs.PageCount Then%> <A HREF="<%=Myself%>?Page=<%=(Page+1)%>">下一页</A> <A HREF="<%=Myself%>?Page=<%=Rs.PageCount%>">最后的一页</A><%End If%>页次:<FONT COLOR="Red"><%=Page%>/<%=Rs.PageCount%></FONT></Form> <%Rs.close%> 新建ASP页面，”TestWebDb2.asp”。主要用来测试GetEmployeeName()方法这个页面相对简单一些<HEAD> <!- 测试页 -><!- 功能：测试组件 -><!- 作者：龙卷风.NET -> <% Dim DataQuery Dim strID Dim strResult Set DataQuery=Server.CreateObject("WebDb.GetInfomation")%> <TITLE>
数据组件测试页
</TITLE><H1><CENTER>欢迎使用数据组件(www.knowsky.com)</CENTER></H1><% If Len(Request.QueryString("ID")) > 0 Then strID = Request.QueryString("ID") Dim Flag Flag=DataQuery.GetConn() If Flag=false then ResPonse.Write "数据库没有连结,请检查" ResPonse.End End if strResult=DataQuery.GetEmployeeName(cint(strID)) if strResult="" then Response.Write "对不起,没有这个编号,请查询" Response.End else ResPonse.Write strResult end if End If%> <FORM NAME="MyForm"><INPUT TYPE=TEXTBOX NAME="EmpID" SIZE=40><P><INPUT LANGUAGE="VBScript" TYPE="BUTTON" VALUE="Search" > </FORM>
</HEAD>一些想法:数据库连结如果放到组件里，如果要修改数据库连结，则要重新编译组件，可能会由此引发一些问题(不过推荐这种，毕竟数据库名和服务器名不会经常改)如果数据库连结放到ASP页面，能通过属性传值到组件中，不过安全性会降低。真是……好了，这篇文章结束了,希望对大家有帮助今后的话题便是怎么实现AspToDll这个软件的功能，我们一步一步实现。
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