今天進行一個學生信息系統的查詢開發時，發現老師給的數據庫（Access）有密碼，不知道怎么連接了，在通常的數據連接中，我添加了password屬性后，提示說我的密碼錯誤，無法連接，刷新了一下后提示說：“文件正在使用或其他的程序以獨占的方式打開了”，怎么辦，以前沒有遇到過此類問題啊！傻了，那就看看MSDN 的幫助，以下是查詢的connectionString的說明，簡單的翻譯以下(紅色的部分翻譯得不好，希望大家幫忙看看)。

ConnectionString Property - ADO

Contains the information used to establish a connection to a data source.

提供給connection的數據庫連接的信息，返回值為一個字符串

Applies To

Connection

Settings and Return Values

Sets or returns a String value.

Remarks

Use the ConnectionString property to specify a data source by passing a detailed connection string containing a series of argument = value statements separated by semicolons.

使用ConnectionStrin屬性的一系列的“argument = value”的參數連接到一個特定的數據庫，連接的參數采用“;”隔離。ADO為ConnectionStrin提供7個連接參數，其他的參數直接由提供者而不是ADO。ADO支持的參數如下：

ADO supports seven arguments for the ConnectionString property; any other arguments pass directly to the provider without any processing by ADO. The arguments ADO supports are as follows:

Argument	Description
?	?
Provider=	Specifies the name of a provider to use for the connection.
Data Source=	Specifies the name of a data source for the connection, for example, a SQL Server database registered as an ODBC data source.
User ID=	Specifies the user name to use when opening the connection.
Password=	Specifies the password to use when opening the connection.
File Name=	Specifies the name of a provider-specific file (for example, a persisted data source object) containing preset connection information.
Remote Provider=	Specifies the name of a provider to use when opening a client-side connection. (Remote Data Service only.)
Remote Server=	Specifies the path name of the sever to use when opening a client-side connection. (Remote Data Service only.)
參數	描述
?	?
Provider=	指定連接的提供者
Data Source=	指定連接的數據源。比如：一個SQL服務器數據庫被注冊為ODBC數據源。
User ID=	打開數據庫用戶名
Password=	打開數據庫的密碼
File Name=	Specifies the name of a provider-specific file (for example, a persisted data source object) containing preset connection information. 指定提供者的特定的文件名（例如：一個XX的數據庫對象），該文件包含連接信息
Remote Provider=	當打開一個客戶端連接時，指定一個服務提供名（僅使用于遠程數據庫）
Remote Server=	當打開一個客戶端連接時，指定服務器的名稱（僅使用于遠程數據庫）

?

After you set the ConnectionString property and open the Connection object, the provider may alter the contents of the property, for example, by mapping the ADO-defined argument names to their provider equivalents.

當打開Connection對象，并為其設置了ConnectionString對象時，提供者將顯示屬性的內容。比如：通過影射ADO定義參數，命名提供者的對象。

The ConnectionString property automatically inherits the value used for the ConnectionString argument of the Open method, so you can override the current ConnectionString property during the Open method call.

通過Open方法，ConnectionString能自動的插入參數值，所以通過調用Open方法可以重載當前的ConnectionString屬性。

Because the File Name argument causes ADO to load the associated provider, you cannot pass both the Provider and File Name arguments.

因為File Name參數可以引起ADO加載自定義的提供者，你不能同時加載Provider和File Name參數屬性。

The ConnectionString property is read/write when the connection is closed and read-only when it is open.

當Connection關閉時，ConnectionString是可讀寫的；連接打開時，ConnectionString又是只讀的。

Remote Data Service Usage When used on a client-side Connection object, the ConnectionString property can only include the Remote Provider and Remote Server parameters.

遠程數據服務的使用方法：當使用客戶端連接對象時，ConnectionString屬性只包含Remote Provider和Remote Server 參數屬性。

Examples

ConnectionString, ConnectionTimeout, and State Properties Example (VB)

See Also

Using OLE DB Providers with ADO

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轉載于:https://www.cnblogs.com/AloneSword/archive/2005/11/03/2237647.html

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