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实例:是否支持XmlHttp组件的判断
- ASP对XML文档中文本的增加、删除、修改、查看
- ASP操作XML文件的主要方法和实现
- asp控制xml数据库的6段代码
- ASP操作XML的类
- ASP关于类的Let,Set和Get的用法的异同
- ASP错误解决:800a003a错误
- XMLHTTP Post Form时的表单乱码
- IIS7.0在Vista系统下安装注意事项
- asp文件打不开的原因
- asp根据表单自动生成sql语句的函数
- 彻底解决XP下IIS无法解释ASP和PHP的问题
- ASP教程:0177:800401f3错误解决
- Service Unavailable错误的解决
- ASP留言本教程
- ASP教程：6大对象和数据库操作简单学
- 配置IIS蜜罐与黑客攻击
- WEB共享与IIS相结合快速建立本地网站
- IIS6架设网站的问题总结
- HTTP 500 - 内部服务器错误的解决
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: 222 ::
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
