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获取客户端某一个图片的x,y坐标的代码
- asp编程中常用的javascript辅助代码
- asp下生成目录树结构的类
- [原创]站长感慨asp编程究竟何去何从
- asp水印组件之AspJpeg的结合代码实例
- asp实现dig功能的js代码
- [原创]asp下用实现模板加载的的几种方法总结
- asp常用函数集合，非常不错以后研究
- 一个asp替换函数img里面多余的代码
- 检查上传图片是否合法的函数,木马改后缀名、图片加恶意代码均逃不过
- 一想千开PJblog审核功能补丁 v2.0版 发布
- asp汉字中文图片验证码
- 用asp实现网页调用doc附Response.ContentType 详细列表
- 利用MSXML2.XmlHttp和Adodb.Stream采集图片
- [原创]asp获取URL参数的几种方法分析总结
- asp实现的可以提醒生日的几种方法附代码
- Asp无组件生成缩略图的代码
- 功能不错的asp模板类代码附下载
- 不用WinRar只有asp将网络空间上的文件打包下载
- AJAX简单应用实例-弹出层
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: 248 ::
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
