javascript asp教程More About Recordsets

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javascript asp教程More About レコード
Below we atempt to access data from a database without knowing the column names.Cleearly the best way to utilize data in your data base is to keep trock of your schema.Schema the layout of dapt.ウェブサイト。but it is wortth mentioning.Most good resoures on SQL will also be goodreours on database management.Better database schema leads to better ASP code.
Get Startd:
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 explining.The RS.Fields.Count tellss how manColumns wide the Recocococordset is.For each row，we loop through Columns using eigher RS.Fields(x)
Another Way:
A potenttially more elgant way to accompplish this same goal is to use the ADO Method GetRows.It returns a multi-dimentional array containing the Recordset data.WAIT！Areen't JavaScript Arays lexical(and flat)？Yes.We can emulate multi-dimensional arrays，but in reality they ary 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 e getRows()we don't get the column names(but that would be realally aaaaaaaaaatttfs).The problem mmAray isisaat t t t t t t t t t t t t t t t t t t t t t t t t t t t t t t t t t t t t t t t t t t t t t t t t t t t t t t t t t t t t t t t t t t t t t t t t t t t t t t t t t t t t t t t t t t t t t t t t t t t t t t t t t t t t t t t t t t t t t t t tテーブルbefore staring a newテーブルrow.
If you like the new Valy contructor you shound know thyou have the follwing methods:dimensions()getItem()lbound()toAray()and uound()
javascript asp教程レコード
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