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 实现对SQL注入危险字符进行重编码处理的函数
- asp下实现对HTML代码进行转换的函数
- asp 验证用户名是否包含有非常字符的函数
- ASP通用分页样式函数代码
- asp 生成任意英文+数字位数长度的随机码函数
- asp 取得中文句子头一个字的大写拼音字母的函数
- asp实现计算两个时间内的工作日的函数
- asp实现过滤关键字的函数
- asp实现限制搜索的关键字的函数
- asp动态include文件，方便多模板的实现
- 推荐的用Asp实现屏蔽IP地址访问的代码
- XDOWNPAGE ASP版本 分页类
- 飞云防CC攻击ASP程序代码插件
- 定期自动运行ASP程式的代码
- ASP下Cookie操作的详细讲解
- 再发几个ASP不错的函数
- 比较不错的asp模板引终极讲解(WEB开发之ASP模式)
- ip138之asp小偷程序代码
- 在VBScript中实现-函数/方法名作为参数传入另一个函数
- asp实现批量插入表单中的数据到数据库的方法
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: 101 ::
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 Also, please don't use a DSN; it's slow and outdated and nobody recommends it.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
