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ADO Open 方法

出处:互联网   整理: 软晨网（RuanChen.com）   发布: 2009-03-04   浏览: 393 ::
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The Open method opens a connection to a data source. When the connection is open, you can execute commands against the data source.
Open方法的作用是：打开一个通往数据源的连接。当连接被打开时，你可以对数据源执行指令。

Syntax
语法

connection.Open connectionstring,userID,password,options

Parameter参数 Description描述
connectionstring Optional. A string value that contains information about the connection. The string is composed of a series of parameter=value statements separated by semicolons.
可选参数。指定一个包含关于连接属性的字符串值。该字符串是由一系列的参数组成的。该参数是通过分号（；）隔开的值语句

Provider= the name of the provider
Provider= 技术提供对象的名称
File Name= the file that contains the connection information
File Name=包含连接信息的文件
Remote Provider= the name of the provider to open a client-side connection
Remote Provider=用于打开客户端连接的技术提供对象的名称
Remote Server= the path name to the server to open a client-side connection
Remote Server=用于打开客户端通往服务器连接的路径名称
URL= the absolute URL address to use for the connection. 
URL= 用于指示连接的绝对URL地址

See the ConnectionString property for details.
具体请参阅ConnectionString属性
userID Optional. A String value that contains a user name for the connection
可选参数。指定包含连接用户名的字符串值
password Optional. A String value that contains a password for the connection
可选参数。指定包含连接密码的字符串值
options Optional. A ConnectOptionEnum value that determines whether this method should return after or before the connection is established.
可选参数。指定一个ConnectOptionEnum值以决定该方法需要在连接建立之前还是之后返回

Example
案例

A DSN-less connection: 
<%
set conn=Server.CreateObject("ADODB.Connection")
conn.Provider="Microsoft.Jet.OLEDB.4.0"
conn.Open "c:/webdata/northwind.mdb"
%>

A DSN-less connection with userID and password
(write the conn.open statement in ONE line): 

<%
set conn=Server.CreateObject("ADODB.Connection")
conn.Open "Provider=Microsoft.Jet.OLEDB.4.0;
data source=c:/webdata/northwind.mdb;
userID=xxx;
password=yyy"
%>

An ODBC Database Connection:

<%
set conn=Server.CreateObject("ADODB.Connection")
conn.Open "northwind"
%>

ConnectOptionEnum
Constant 常量 Value值 Description描述
adConnectUnspecified -1 Default. Opens the connection synchronously (after).
默认值。同步打开连接
adAsyncConnect 16 Opens the connection asynchronously (before).
非同步打开连接

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