オブジェクトの状態が開いているか閉じられているかにかかわらず、適用可能なすべてのオブジェクトを示します。 Indicates for all applicable objects whether the state of the object is open or closed. Example.
Indicates for all applicable objects whether the state of the object is open or closed. But SqlConnection.Open Method will throw InvalidOperationException if the connection is already open as explained here. Return Value

This property can be used with the Command, Connection, Record, Recordset, and Stream object.

実務に役立つAccess VBA入門サイト。ここではADO ConnectionオブジェクトのStateプロパティを使用してデータベースに接続状態を確認する方法について説明します。詳細は・・・。Digital Life Note（デジタルライフノート）。賢く合理的に、かつ経験に裏打ちされた快適なデジタルライフを送る … JonH JonH. on the Set rs.ActiveConnection = cn line. This example demonstrates different ways of using the ConnectionString property to open a Connection object. The State property returns a value that describes if the object is open, closed, connecting, executing or retrieving data. A collection of WorkbookConnection objects for the specified workbook.. You can check the state of your connection like so: If sqlConnection.State <> ConnectionState.Open Then End If share | follow | edited Jan 18 '16 at 20:13. answered Jan 18 '16 at 20:06. It is either closed or invalid in this context." The following example shows how to add a connection to a workbook from an existing file. As Reza Ahmadi said in Solution 2, it is necessary to open connection, before it is used. If the object is executing an asynchronous method, indicates whether the current state of the object is connecting, executing, or retrieving. It also uses the ConnectionTimeout property to set a connection timeout period, and the State property to check the state of the connections.

The State property can have a combination of values. 30.3k 11 11 gold badges 77 77 silver badges 131 131 bronze badges @Rusmir - It's been a while since I've done vb.net. It goes into the (cn.State And adStateOpen) = adStateOpen is true part first. ConnectionString, ConnectionTimeout, and State Properties Example (VB) 01/19/2017; 2 minutes to read; In this article. State Property (ADO) 01/19/2017; 2 minutes to read; In this article. Default is adStateClosed.
The value returns an ObjectStateEnum value. Connections object (Excel) 03/29/2019; 2 minutes to read +1; In this article.

State プロパティ (ADO) State Property (ADO) 01/19/2017; この記事の内容. If (cn.State And adStateOpen) = adStateOpen Then MsgBox "cn Connection is already open."

SqlConnection.Open Method[] So if you are not sure about the current state of the connection, then I think it is better idea to check state to avoid throwing an exception.


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