BeginBackup(String) Method

In This Topic

Starts an asynchronous invocation of a Backup(String) method.

Syntax

Visual Basic
C#

'Declaration
 
Public Overloads Function BeginBackup( _
   ByVal fileName As String _
) As IAsyncResult

public IAsyncResult BeginBackup( 
   string fileName
)

Parameters

fileName: The name of the file to write the script to.

Return Value

An System.IAsyncResult interface that represents the asynchronous operation started by calling this method.

Remarks

BeginBackup(String) method enables you to perform a backup operation without having current thread blocked. In other words, your program can continue execution while the backup runs in background so you do not have to wait for it.

To start the backup operation, you have to call BeginBackup(String) method, which in turn invokes appropriate actions in another thread. Return value of this method must be assigned to an System.IAsyncResult object. After executing this method, the program flow continues.

When you are ready to finish the backup operation, call EndBackup. If at the moment you call this function the backup has not yet been finished, application stops and waits till the function returns.

Example

This sample demonstrates performing async backup and restore operations.

csharp

public void DumpIt(MySqlConnection myConnection) {
        myConnection.Open();
        MySqlDump mySqlDump = new MySqlDump();
        mySqlDump.Connection = myConnection;
        myConnection.Database = "Test";
        mySqlDump.IncludeDrop = true;
        mySqlDump.GenerateHeader = true;
        mySqlDump.Tables = "Dept;Emp";
        IAsyncResult myResult = mySqlDump.BeginBackup("d:\\tmp\\mysqldump.dmp");
        while (!myResult.IsCompleted) {
                Console.Write(".");
                //Perform here any operation you need
        }
        mySqlDump.EndBackup(myResult);
        Console.WriteLine("Dumped.");
        myConnection.Close();
}

public void UnDumpIt(MySqlConnection myConnection) {
        myConnection.Open();
        MySqlDump mySqlDump = new MySqlDump();

        mySqlDump.Connection = myConnection;
        myConnection.Database = "Test";
        IAsyncResult myResult = mySqlDump.BeginRestore("d:\\tmp\\mysqldump.dmp");
        while (!myResult.IsCompleted)
        {
                Console.Write(".");
                //Perform here any operation you need
        }
        mySqlDump.EndRestore(myResult);
        Console.WriteLine("Restored.");
        myConnection.Close();
}

Visual Basic

Public Sub DumpIt(myConnection As MySqlConnection)
        myConnection.Open()
        Dim mySqlDump As New MySqlDump()
        mySqlDump.Connection = myConnection
        myConnection.Database = "Test"
        mySqlDump.IncludeDrop = True
        mySqlDump.GenerateHeader = True
        mySqlDump.Tables = "Dept;Emp"
        Dim myResult As IAsyncResult = mySqlDump.BeginBackup("d:\tmp\mysqldump.dmp")
        While Not myResult.IsCompleted
                'Perform here any operation you need
                Console.Write(".")
        End While
        mySqlDump.EndBackup(myResult)
        Console.WriteLine("Dumped.")
        myConnection.Close()
End Sub

Public Sub UnDumpIt(myConnection As MySqlConnection)
        myConnection.Open()
        Dim mySqlDump As New MySqlDump()

        mySqlDump.Connection = myConnection
        myConnection.Database = "Test"
        Dim myResult As IAsyncResult = mySqlDump.BeginRestore("d:\tmp\mysqldump.dmp")
        While Not myResult.IsCompleted
                'Perform here any operation you need
                Console.Write(".")
        End While
        mySqlDump.EndRestore(myResult)
        Console.WriteLine("Restored.")
        myConnection.Close()
End Sub

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

DbDump Class
DbDump Members
Overload List

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