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The longest and most involved event handler in this application is the one that handles mouse movement. That s because there are three different tasks that you might perform at this point: If dragging mode is enabled, move the control. If resizing mode is enabled, resize the control. If neither mode is enabled, check if the mouse pointer is near one of the borders of the focus square, and then update the mouse pointer accordingly.

The Oracle database can publish a set of performance counters for the connection pool to the Windows Performance Monitoring (Perfmon) tool. ODP.NET allows you to enable or disable individual performance counters. Table 2-2 shows some of the various performance counters available. Table 2-2. Performance Counters in Oracle

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The first of these tasks is easy to accomplish and takes only a few lines of code: Private Sub DrawingSurface_MouseMove(ByVal sender As Object, _ ByVal e As MouseEventArgs) Handles MyBaseMouseMove If isDragging Then Dim oldPosition, newPosition As Rectangle oldPosition = currentShapeGetLargestPossibleRegion() currentShapeLocation = New Point(eX - clickOffsetX, _ eY - clickOffsetY) ' Invalidate a section of the form that includes the old and new ' positions newPosition = currentShapeGetLargestPossibleRegion() Invalidate(RectangleUnion(oldPosition, newPosition)) .. The resizing process is much more complicated That s because the application supports resizing from several different locations, and in each case, the resize behavior differs slightly For example, if the user clicked on the top or top-right of the control, then horizontal resizing is allowed That means the control can grow taller or shorter, but its width can t change.

The current resize mode is stored in a form-level variable named resizingMode (not shown) In addition, not only do you need to resize the shape correctly, you also need to check to make sure that the user hasn t tried to drag the shape to be less than the minimum bounds that are allowed Here s how the process unfolds when the user is dragging the top edge: .. ElseIf isResizing Then Dim minSize As Integer = 5 Dim oldPosition, newPosition As Rectangle oldPosition = currentShapeGetLargestPossibleRegion() ' Resize the control, according to the resize mode Select Case resizingMode ' Clicks on the top and top-right corner are treated in the same ' way The top edge of the control is selected, and can be dragged ' up or down Case ShapeHitSpotTop, ShapeHitSpot.

Total number of new database sessions established each second Total number of database sessions closed each second Total number of cached connections retrieved from the connection pool Total number of cached connections released into the connection pool Total number of active connection pools Total number of inactive connection pools Total number of connections in use Total number of connections available across all connection pools Total number of pooled active (open) connections Total number of nonpooled active (open) connections Total number of connections internally disposed of by the garbage collector Total number of connections that have been closed by the user but are in stasis (that is, awaiting release back into the connection pool)

TopRightCorner ' Before resizing the control, make sure the top edge hasn't ' been dragged below the bottom edge ' The minimum size forces the shape to be a 5-pixel sliver If eY < (currentShapeLocationY + _ currentShapeSizeHeight - minSize ) Then ' When the top edge is dragged, you need to change both the ' position of the control and the size to reflect the new ' top edge..

So why have more than one way of creating a string Good question; let s say we want to store the sentence I said "hocus pocus" to the wizard in a string If we put the entire sentence in a string with double quotes, Python has no way of knowing that you want to end the string after the word wizard, and will assume that the string ends at the space after said Let s try it and see what happens: >>> print "I said "hocus pocus" to the wizard" Traceback ( File "<interactive input>", line 1 print "I said "hocus pocus" to the wizard" ^ SyntaxError: invalid syntax Python has thrown an exception More about exceptions later in the book, but for now if you see an exception like this Python is telling you that something is wrong with the code you entered.

NumberOfActiveConnectionPools NumberOfInactiveConnectionPools NumberOfActiveConnections NumberOfFreeConnections

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