# ADO Open Method

Complete Connection Object Reference

The Open method opens a connection to a data source. When the connection is open, you can execute commands against the data source.

### Syntax

connection.Open connectionstring,userID,password,options

Parameter | Description
--- | ---

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.

Provider= the name of the provider
File Name= the file that contains the connection information
Remote Provider= the name of the provider to open a client-side connection
Remote Server= the path name to the server to open a client-side connection
URL= the absolute URL address to use for the connection.

See the ConnectionString property for details.

userID | Optional. A String value that contains a user name for the connection
password | Optional. A String value that contains a password for the connection
options | Optional. A ConnectOptionEnum value that determines whether this method should return after or before the connection is established.

### Example

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 | Value | Description
--- | --- | ---
adConnectUnspecified | -1 | Default. Opens the connection synchronously (after).
adAsyncConnect | 16 | Opens the connection asynchronously (before).

Complete Connection Object Reference

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