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页面随机添加字符实现防复制的代码
- ASP中应用事务处理技巧
- asp下比较全面的获取IP地址的代码
- ASP实现缓存类无错版
- asp下实现批量插入数据的方法
- asp下用ADODB.Stream代替FSO读取文本文件
- asp之基于adodb.stream的文件操作类
- 自己写的文件操作的function和Sub vb.net dll
- kesion科讯V4.0管理员Key工具
- asp 获取access系统表，查询等操作代码
- asp之字符串函数示例
- asp之日期和时间函数示例
- ASP 关于动态数据显示页面得锚点
- Asp无组件上传进度条解决方案
- ASP控制每页打印行数
- 用ASP实现分级权限控制
- ASP在服务器自动解压RAR文件
- 用ASP实现远程将文件批量改名的代码
- 在Asp程序中取得表单所有内容的代码
- 使用ASP实现网站的“目录树”管理的代码
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: 109 ::
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
