繁體中文当前位置: 首页 > 图文教程 > 网络编程 > ASP > javascript asp教程More About Recordsets
- ASP
- ASP技巧：让Len,Left,Right函数识别中文
- Flash和ASP实现的用户登录/注册程序
- ASP随机显示不重复记录解决方案
- ASP动态网页制作常用错误处理
- ASP对网页进行限制性的访问
- 初学:ASP内建对象Response
- ASP Server object error的解决办法
- ASP教程,ASP实现防盗链的方法
- 更改windows XP 的IIS连接数
- xmldom在服务器端生成静态html页面
- asp技巧:防止被杀毒软件误删的代码
- ASP教程:初步接触ASP缓存技术
- ASP教程:rs.getrows的使用方法介绍
- ASP技巧:Utf-8和Gb2312乱码问题的终结
- ASP教程:applicaton对象的使用集合
- ASP环境:启动停止IIS不重启电脑的技巧
- 利用FLV组件制作的播放器，动态获取变量，控制FLV文件
- ASP教程:ASP错误ASP 0201的解决方法
- ASP技巧教程:认识学习codepage的属性
- Codepage参数和其对应的语言
ASP 中的 javascript asp教程More About Recordsets
出处:互联网 整理: 软晨网（RuanChen.com） 发布: 2009-09-13 浏览: 218 ::
收藏到网摘: n/a
Below we will attempt to access data from a database without knowing the column names. Clearly the best way to utilize data in your database is to keep track of your schema. Schema is the layout of data in your database. The concept is well beyond the scope of this web site, but it is worth mentioning. Most good resources on SQL will also be good resources on database management. Better database schema leads to better ASP code.
Get Started:
Below is the script for Lesson 18.
<%@LANGUAGE="JavaScript"%>
<!-- METADATA TYPE="typelib"
FILE="C:\Program Files\Common Files\System\ado\msado15.dll" -->
<HTML>
<BODY>
<%
var myConnect = "Provider=Microsoft.Jet.OLEDB.4.0; Data Source=";
myConnect += Server.MapPath("\\")
myConnect += "\\GlobalScripts\\htmlColor.mdb;";
var ConnectObj = Server.CreateObject("ADODB.Connection");
var RS = Server.CreateObject("ADODB.Recordset");
var sql="SELECT * FROM colorChart;";
ConnectObj.Open (myConnect);
RS.Open(sql,ConnectObj,adOpenForwardOnly,adLockReadOnly,adCmdText);
var recordCount = RS.Fields.Count;
var x = 0;
var getFieldNames = false;
Response.Write("<TABLE BORDER=\"1\" CELLSPACING=\"0\">\r");
while (!RS.EOF) { if (x >= recordCount) { x = 0 } Response.Write("<TR>"); if (!getFieldNames) { while (x <= recordCount-1) { Response.Write("<TH>" + RS.Fields(x).Name + "</TH>"); x++; } getFieldNames = true; x = 0; Response.Write("</TR>\r<TR>") } while (x <= recordCount-1) { Response.Write("<TD>" + RS.Fields(x).Value + "</TD>"); x++; } Response.Write("</TR>\r"); RS.MoveNext(); }
Response.Write("</TABLE>\r");
RS.Close();
ConnectObj.Close();
RS = null;
ConnectObj = null;
%>
</BODY>
</HTML>
Click Here to run the script in a new window.
I don't think this needs much explaining. The
Another Way:
A potentially more elegant way to accomplish this same goal is to use the ADO Method GetRows. It returns a multi-dimensional array containing the Recordset data. WAIT! Aren't JavaScript Arrays lexical (and flat)? Yes. We can emulate multi-dimensional arrays, but in reality they are flat. So it's a no-go on the GetRows... unless we do something really creative.
<%@LANGUAGE="JavaScript"%>
<!-- METADATA TYPE="typelib"
FILE="C:\Program Files\Common Files\System\ado\msado15.dll" -->
<HTML>
<BODY>
<%
var myConnect = "Provider=Microsoft.Jet.OLEDB.4.0; Data Source=";
myConnect += Server.MapPath("\\")
myConnect += "\\GlobalScripts\\htmlColor.mdb;";
var ConnectObj = Server.CreateObject("ADODB.Connection");
var RS = Server.CreateObject("ADODB.Recordset");
var sql="SELECT * FROM colorChart;";
ConnectObj.Open (myConnect);
RS.Open(sql,ConnectObj,adOpenForwardOnly,adLockReadOnly,adCmdText);
var myArray = RS.GetRows().toArray();
Response.Write("Let's see the results of myArray as JavaScript");
Response.Write(" sees them (which is flat).<BR>\r");
Response.Write(myArray + "<BR><BR>\r")
RS.MoveFirst();
var myVBArray = new VBArray(RS.GetRows())
Response.Write("We can use the <I>new VBArray</I> constructor and the ")
Response.Write("<I>getItem( )</I> method. For example: myVBArray.getItem(1,1) ")
Response.Write("returns " + myVBArray.getItem(1,1) + "<BR><BR>\r")
Response.Write("Now lets make something useful.<BR>\r")
Response.Write("<TABLE BORDER=1 CELLPADDING=0 CELLSPACING=0>")
Response.Write("\r<TR>")
for (var x=0; x<=myArray.length-1; x++) { Response.Write("<TD>" + myArray[x] + "</TD>") if ((x+1)%RS.Fields.Count==0) { Response.Write("</TR>\r<TR>") } }
Response.Write("</TR>\r")
Response.Write("</TABLE>")
RS.Close();
RS = null;
ConnectObj.Close();
ConnectObj = null;
%>
</BODY>
</HTML>
Click Here to run the script in a new window.
Notice when we use getRows( ) we don't get the column names (but that would be really easy to fix). The problem with myArray is that it's not very useful in its raw state. So we use a modulo operator and thanks to a little thing called RS.Fields.Count we can tell how many times we write data to the table before staring a new table row.
If you like the new VBArray constructor you should know that you have the following methods: dimensions() getItem() lbound() toArray() and ubound().
评论 (0) All
