DDR爱好者之家

javascript asp教程添加和修改
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DDR爱好者之家 Design By 杰米

The Connection Execute():

If you want to retrieve data from a database then you have no choice but to use a Recordset. However, for the purposes of adding, updating, and deleting data you don't necessarily have to have a Recordset. It's up to you.

For the purposes of adding, updating and deleting you can avoid the Recordset by using the Execute() method.

Get Started:

Below is the script for Lesson 19. 

<%@LANGUAGE="JavaScript"%>
var strConnect="Provider=Microsoft.Jet.OLEDB.4.0; Data Source=" 
strConnect += Server.MapPath("\\GOP") + "\\datastores\\gop.mdb;"
<!-- METADATA TYPE="typelib" 
FILE="C:\Program Files\Common Files\System\ado\msado15.dll" -->
<HTML>
<HEAD>
<TITLE>Administrator Page - Changing the Mailing List</TITLE>
</HEAD>
<BODY LINK="red" VLINK="red" ALINK="crimson">
<H2>Administrator Page</H2>
<H3>Changing a the Mailing List</H3>
<%
if (Request.Form("Delete") > "")
	{
	var sql="DELETE FROM Address WHERE ID = " + Request.Form("ID") + ";"
	}
else
	{
	var firstName = new String(Request.Form("firstName"))
	var lastName = new String(Request.Form("lastName"))
	var Address = new String(Request.Form("Address"))
	var City = new String(Request.Form("City"))

	var myRegExp = /[']/g;
	firstName = firstName.replace(myRegExp, '&#39;');
	lastName = lastName.replace(myRegExp, '&#39;');
	Address = Address.replace(myRegExp, '&#39;');
	City = City.replace(myRegExp, '&#39;');
	
	var sql="UPDATE Address SET firstName= '" + firstName + "' , lastName='" 
	sql += lastName + "' , Address='" + Address + "' , City='" 
	sql += City + "' , State='" + Request.Form("State") + "' , Zip='" 
	sql += Request.Form("Zip") + "' WHERE ID = " + Request.Form("ID") + ";"
	}
var objConn=Server.CreateObject("ADODB.Connection");
objConn.Open(strConnect)
objConn.Execute(sql)
objConn.Close()
objConn = null;
Response.Write("The member has been updated in the database.")
Response.Write("<A HREF=\"../files/committee.asp\">")
Response.Write("Click here to see it.</A>")
%>

There's no link to see this one in action. I did that for security reasons. I just want to point out a few highlights.

Danger in The Single Quote:

You'll notice that I replace single quote marks with the HTML encoded equivalent. I did that using the following code. 

var myRegExp = /[']/g;
firstName = firstName.replace(myRegExp, '&#39;');

The single quote is the only character you cannot input into a database using an ASP application. Everything else is fair game. DO NOT accept any text from users into your database without replacing all single quotes. To use an analogy, the single quote is like a key that opens up your entire database. Hackers will tear your application to shreds if you let someone input single quotes.

Execute( ):

The only other thing I want to spend any time with is objConn.Execute(sql). The variable sql takes on one of two definitions depending on the result of an "if" statement. In this case sql does all the work, and we never need a recordset.

DDR爱好者之家 Design By 杰米
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RTX 5090要首发 性能要翻倍！三星展示GDDR7显存

三星在GTC上展示了专为下一代游戏GPU设计的GDDR7内存。

首次推出的GDDR7内存模块密度为16GB，每个模块容量为2GB。其速度预设为32 Gbps（PAM3），但也可以降至28 Gbps，以提高产量和初始阶段的整体性能和成本效益。

据三星表示，GDDR7内存的能效将提高20%，同时工作电压仅为1.1V，低于标准的1.2V。通过采用更新的封装材料和优化的电路设计，使得在高速运行时的发热量降低，GDDR7的热阻比GDDR6降低了70%。

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DDR爱好者之家 Design By 杰米