Open Method (BigQueryConnection)

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Opens a Google BigQuery connection with the property settings specified by the ConnectionString.

Syntax

Visual Basic
C#


'Declaration Public Overrides Sub Open()


public override void Open()

Remarks

The BigQueryConnection draws an open connection from the connection pool if one is available. Otherwise, it establishes a new connection to the data source.

Note: If the BigQueryConnection goes out of scope, the connection it represents does not close automatically. Therefore, you must explicitly close the connection by calling Devart.Common.DbConnectionBase.Close.

Opening an open connection does nothing.

Example

The following example creates a BigQueryConnection, opens it, displays some of its properties, and then closes the connection.

csharp


public void CreateBigQueryConnection(string myConnString) { BigQueryConnection bigQueryConnection = new BigQueryConnection(myConnString); bigQueryConnection.Open(); MessageBox.Show("ServerVersion: " + bigQueryConnection.ServerVersion + "\nState: " + bigQueryConnection.State.ToString()); bigQueryConnection.Close(); }

public void CreateBigQueryConnection(string myConnString)
{
  BigQueryConnection bigQueryConnection = new BigQueryConnection(myConnString);
  bigQueryConnection.Open();
  MessageBox.Show("ServerVersion: " + bigQueryConnection.ServerVersion
    + "\nState: " + bigQueryConnection.State.ToString());
  bigQueryConnection.Close();
}

Visual Basic


Public Sub CreateBigQueryConnection(myConnString As String) Dim bigQueryConnection As New BigQueryConnection(myConnString) bigQueryConnection.Open() MessageBox.Show("ServerVersion: " + bigQueryConnection.ServerVersion _ + ControlChars.Cr + "State: " + bigQueryConnection.State.ToString()) bigQueryConnection.Close() End Sub

Public Sub CreateBigQueryConnection(myConnString As String)
  Dim bigQueryConnection As New BigQueryConnection(myConnString)
  bigQueryConnection.Open()
  MessageBox.Show("ServerVersion: " + bigQueryConnection.ServerVersion _
    + ControlChars.Cr + "State: " + bigQueryConnection.State.ToString())
  bigQueryConnection.Close()
End Sub

Reference

BigQueryConnection Class
BigQueryConnection Members
Close Method

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