UniConnection Class

In This Topic

Syntax
Remarks
Example
Inheritance Hierarchy
Requirements
See Also

Represents an open connection to a server.

Syntax

Visual Basic
C#

public class UniConnection : Devart.Common.DbConnectionBase, System.ComponentModel.IComponent, System.ComponentModel.ISupportInitialize, System.Data.IDbConnection, System.ICloneable, System.IDisposable

'Declaration
 
Public Class UniConnection 
   Inherits Devart.Common.DbConnectionBase
   Implements System.ComponentModel.IComponent, System.ComponentModel.ISupportInitialize, System.Data.IDbConnection, System.ICloneable, System.IDisposable

Remarks

A UniConnection object represents a unique connection to the server. Use it in conjunction with UniCommand, UniDataReader, UniDataAdapter or other components for convenient interoperation with database.

When you create an instance of UniConnection, all properties are set to their initial values. For a list of these values, see the UniConnection Constructor constructor.

If the UniConnection goes out of scope, it is not closed. Therefore, you must explicitly close the connection by calling Close.

A single UniConnection can be used by many UniCommand objects on the assumption that all operations will be done consecutively. In other words, you can not execute a SQL statement while an asynchronous operation is in progress.

Example

The following example creates a UniCommand and a UniConnection. The UniConnection is opened and set as the Connection property. The example then calls Devart.Common.DbCommand.ExecuteNonQuery method, and closes the connection. To accomplish this, the Devart.Common.DbCommand.ExecuteNonQuery is passed a connection string and a query string that is SQL INSERT statement.

csharp

public void InsertRow(string myConnectionString)
{
  // If the connection string is empty, use default.
  if(myConnectionString == "")
  {
    myConnectionString = "Provider=SQL Server;Data Source=SERVER;Initial Catalog=Northwind;User ID=sa";
  }
  UniConnection myConn = new UniConnection(myConnectionString);
  string myInsertQuery = "INSERT INTO Test.Dept(DeptNo, DName) Values(50, 'DEVELOPMENT')";
  UniCommand myCommand = new UniCommand(myInsertQuery);
  myCommand.Connection = myConn;
  myConn.Open();
  try
  {
    myCommand.ExecuteNonQuery();
  }
  finally
  {
    myConn.Close();
  }
}

Visual Basic

Public Sub InsertRow(myConnectionString As String)
  ' If the connection string is empty, use default.
  If myConnectionString = "" Then
    myConnectionString = "Provider=SQL Server;Data Source=SERVER;Initial Catalog=Northwind;User ID=sa"
  End If
  Dim myConn As New UniConnection(myConnectionString)
  Dim myInsertQuery As String = "INSERT INTO Test.Dept(DeptNo, DName) Values(50, 'DEVELOPMENT')"
  Dim myCommand As New UniCommand(myInsertQuery)
  myCommand.Connection = myConn
  myConn.Open()
  Try
    myCommand.ExecuteNonQuery()
  Finally
    myConn.Close()
  End Try
End Sub

Inheritance Hierarchy

System.Object
   System.MarshalByRefObject
      System.ComponentModel.Component
         System.Data.Common.DbConnection
            Devart.Common.DbConnectionBase
               Devart.Data.Universal.UniConnection

Requirements

Target Platforms: Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

Reference

UniConnection Members
Devart.Data.Universal Namespace
UniDataAdapter Class
UniCommand Class

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