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
- 随机提取Access/SqlServer数据库中的10条记录的SQL语句
- 实现对Access数据库表重命名的一段代码
- XML+XSL+CSS+ASP打造留言簿
- 小偷&小偷入库&采集入库
- 使用asp代码突破163相册的防盗连
- CJJ专用ASP类库中的某个class
- 能不能在flash动画中给asp传递变量？
- 禁止站外提交表单
- 改进一下asp自带的formatNumber函数
- 收集asp的常用函数
- CHR(10)表示换行，CHR(13)表示回车，CHR(32)表示空格
- ASP 指南
- pjblog2的参数
- ASP智能搜索的实现
- 网站生成静态页面攻略2:数据采集
- 网站生成静态页面攻略3:防采集策略
- 网站生成静态页面攻略4:防采集而不防搜索引擎策略
- 简单分页函数一 常用
- asp最常用的分页函数
- asp:生成静态页面函数
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: 82 ::
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 Also, please don't use a DSN; it's slow and outdated and nobody recommends it.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
