ADO Open 方法

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出处:互联网 整理: 软晨网（RuanChen.com） 发布: 2009-03-04 浏览: 222 ::

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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

ADO Open 方法

Syntax 语法

Example 案例

ConnectOptionEnum

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Syntax
语法

Example
案例