繁體中文当前位置: 首页 > 图文教程 > 网络编程 > ASP > javascript asp教程创建数据库连接
- ASP
- ASP技巧：让Len,Left,Right函数识别中文
- Flash和ASP实现的用户登录/注册程序
- ASP随机显示不重复记录解决方案
- ASP动态网页制作常用错误处理
- ASP对网页进行限制性的访问
- 初学:ASP内建对象Response
- ASP Server object error的解决办法
- ASP教程,ASP实现防盗链的方法
- 更改windows XP 的IIS连接数
- xmldom在服务器端生成静态html页面
- asp技巧:防止被杀毒软件误删的代码
- ASP教程:初步接触ASP缓存技术
- ASP教程:rs.getrows的使用方法介绍
- ASP技巧:Utf-8和Gb2312乱码问题的终结
- ASP教程:applicaton对象的使用集合
- ASP环境:启动停止IIS不重启电脑的技巧
- 利用FLV组件制作的播放器，动态获取变量，控制FLV文件
- ASP教程:ASP错误ASP 0201的解决方法
- ASP技巧教程:认识学习codepage的属性
- Codepage参数和其对应的语言
ASP 中的 javascript asp教程创建数据库连接
出处:互联网 整理: 软晨网（RuanChen.com） 发布: 2009-09-13 浏览: 209 ::
收藏到网摘: n/a
While this section is devoted to ASP database utilization, it very important to remember that this web site is not intended to be a thorough ASP resource. Remember, the focus of this site is strictly limited to how to use JavaScript as your primary scripting language for ASP.
You'll see how to construct connection strings in JavaScript, use JavaScript loops to manipulate recordsets, convert the JavaScript Date Object into a format that databases can accept, and to some extent you'll see how to make SQL statements in JavaScript.
You can find a lot of good resources on database utilization. Those resources, coupled with the next four lessons, will be everything you need to write ASP JavaScript database applications.
The Connection Object:
The connection object is the link between the database and your ASP script. Remember, it's a created or instanciated object, so we can have two or more instances of Connection on one page. Connection has eight (8) methods, eleven (11) properties, nine (9) events, and finally it has two (2) properties. We will discuss three of the methods, one of the properties, and then we will forego the rest.
There are four common connections. 1) MDL 2) DSN 3) ODBC 4) OLE-DB. MDL stands for Microsoft Data Link. Don't use it. Also, please don't use a DSN; it's slow and outdated and nobody recommends it. ODBC is better, but it's not the best. The recommended connection type is OLE-DB. That's the type of connection you'll see demonstrated below.
Get Started:
Below is the script for Lesson 16. Don't try to understand it yet. We will slowly pick this thing apart down below.
<%@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 ID, colorName, hexValue FROM colorChart;";
ConnectObj.Open (myConnect);
RS.Open(sql,ConnectObj,adOpenForwardOnly,adLockReadOnly,adCmdText);
Response.Write("<TABLE BORDER=\"1\" CELLSPACING=\"0\">\r");
Response.Write("<TR><TH>ID</TH><TH>colorName</TH>");
Response.Write("<TH>hexValue</TH></TR>\r");
while (!RS.EOF) { Response.Write("<TR><TD>" +RS("ID")+ "</TD><TD BGCOLOR=\"#"); Response.Write( RS("hexValue")+ "\">" + RS("colorName") ); Response.Write("</TD><TD>" +RS("hexValue")+ "</TD></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.
Connection String:
This is by no means the most sophisticated database application ever built, but it will demonstrate everything we need to do. Let's start by looking at the connection string reprinted below.
var myConnect = "Provider=Microsoft.Jet.OLEDB.4.0; Data Source=";
myConnect += Server.MapPath("\\ASP")
myConnect += "\\GlobalScripts\\htmlColor.mdb;";
That does look different than a VBScript connection string. As a matter of fact, let's compare.
Dim myVBconnect;
myVBconnect = "Provider=Microsoft.Jet.OLEDB.4.0; Data Source=";
myVBconnect += Server.MapPath("\ASP")
myVBconnect += "\GlobalScripts\htmlColor.mdb;";
We already talked about escape characters in lesson 02. We won't revisit them here. Down below you'll see that we use myConnect as an argument in the Open() method.
Managing the Connection:
I want you to pay attention to the next four lines of code that I reprinted below. First we instanciate a Connection Object.
var ConnectObj = Server.CreateObject("ADODB.Connection");
Then we open the Connection.
ConnectObj.Open (myConnect);
Then the Connection Object becomes the second argument in the Recordset Open() method.
RS.Open(sql,ConnectObj,adOpenForwardOnly,adLockReadOnly,adCmdText);
And lastly, when we are finished with the Connection, we close it.
ConnectObj.Close();
Next Up:
There is a lot of code left unexplained in this example. We'll repeat the same script in lesson 17 and go over most of what we left out the first time through.
评论 (0) All
