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利用dictionary创建二维数组
- ASP + Serv-u 实现FTP的代码
- asp获取数据库中所有表名和字段名
- SITEMAP生成程序的ASP实现
- 通过XMLHTTP实现模板式静态页生成
- 实践xml缓存技术构建高性能web站点
- 一个简单好用的UBB编辑器(含代码)
- 使用ASP脚本命令重新启动服务器
- 技巧：用ASP在线创建Word与Excel文档
- ASP.NET后台代码实现XmlHttp跨域访问
- 浅析 ASP.NET编程中的十大技巧
- 用ASP实现IE地址栏参数的判断
- ASP调用SQL Server视图和存储过程
- 应用：用ASP实现在线文章翻译的功能
- ASP实现无组件生成验证码-GIF格式
- ASP实现长文章自动分页的函数代码
- 深入研究Application和Session对象
- 提高ASP的速度的方法：GetString
- ASP进阶教程Ⅶ：留言簿设置密码验证
- asp获取文件md5值
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: 106 ::
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
