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// The current shape. private ShapeType shape = ShapeType.Rectangle; private GraphicsPath path = null; public ShapeType Type { get { return shape; } set { shape = value; RefreshPath(); this.Invalidate(); } } // Create the corresponding GraphicsPath for the shape, and apply // it to the control by setting the Region property. private void RefreshPath() { if (path != null) path.Dispose(); path = new GraphicsPath(); switch (shape) { case ShapeType.Rectangle: path.AddRectangle(this.ClientRectangle); break; case ShapeType.Ellipse: path.AddEllipse(this.ClientRectangle); break; case ShapeType.Triangle: Point pt1 = new Point(this.Width / 2, 0); Point pt2 = new Point(0, this.Height); Point pt3 = new Point(this.Width, this.Height); path.AddPolygon(new Point[] {pt1, pt2, pt3}); break; } this.Region = new Region(path); } protected override void OnPaint(System.Windows.Forms.PaintEventArgs e) { base.OnPaint(e); if (path != null) { SolidBrush shapeBrush = new SolidBrush(this.BackColor); Pen shapePen = new Pen(this.ForeColor, 5);

In addition to offering the global transaction isolation level, MySQL lets you specify how the transaction processing system in InnoDB should treat individual statements within a transaction. The LOCK IN SHARE MODE clause, appended to a SELECT statement, informs InnoDB that it should prevent other transactions from updating or deleting any rows that are affected by the SELECT statement until the transaction containing the LOCK IN SHARE MODE statement has finished. Additionally, that transaction must wait until any currently executing (uncommitted) transaction that may update or delete those SELECTed data rows has committed, and will check that the data rows still exist before proceeding with the transaction. Here is an example of a transaction that uses the LOCK IN SHARE MODE to prevent other transactions from deleting of modifying the parent key data before it commits: mysql> START TRANSACTION; mysql> SELECT child.* FROM child JOIN parent ON child.parent_id = parent.id WHERE parent.id = 4 LOCK IN SHARE MODE; mysql> // Do Some processing here on child record mysql> COMMIT; You can use the FOR UPDATE clause of the SELECT statement when you want to alert InnoDB that the transaction intends to eventually update the needed row, and that other transactions must wait until this transaction is finished before updating the data that is included in the result of the SELECT statement. This is useful for ensuring that the data you read inside a transaction that you will later use for an update of, say, a summary table, is reliable for the duration of the transaction.

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It is not difficult to see how this feature can benefit large deployments. In a deployment consisting of 50 servers, for example, the systems administrator does not have to run the Oracle Universal Installer (and the wizard after that) 50 times to install the ODP.NET client on each machine. The installation could be done centrally from a single server by copying the files required directly into the target machines over the network using xcopy.

e.Graphics.SmoothingMode = SmoothingMode.AntiAlias; e.Graphics.FillPath(shapeBrush, path); e.Graphics.DrawPath(shapePen, path); shapePen.Dispose(); shapeBrush.Dispose(); } } protected override void OnResize(System.EventArgs e) { base.OnResize(e); RefreshPath(); this.Invalidate(); } } As you can see, there s no need to code properties like BackColor, ForeColor, Location, or Size because these members are all built into the base Control class. The code emphasizes that it s using built-in members by using the this keyword (as in this.BackColor rather than just BackColor).

If two or more transactions happen to want to update the same resource at the same time, they end up waiting for each other to commit in order to complete their own update. This behavior is known as a deadlock, and it usually occurs on high-volume transactional systems, where numerous concurrent connections are actively updating similar data records. InnoDB has some built-in safeguards to resolve deadlocks and contention among connections. Let s create a deadlock in our system so you can see what happens when InnoDB is stuck between transactions needing access to the same resource. Continuing with our previous example, execute this code in Connection 1: mysql> START TRANSACTION; mysql> SELECT * FROM numbers WHERE my_number = 5 FOR UPDATE; +-----------+ | my_number | +-----------+ | 5 | +-----------+ 1 rows in set (0.00 sec) (We ve removed some of the zero resultsets returned by the first two statements for brevity.)

Tip To avoid re-creating the brushes and pens each time the shape is drawn, you could create the brush and pen once, and store them in member variables. You would then need to check to make sure the color hasn t changed before you reuse the pen and brush (or react to the ForeColorChanged and BackColorChanged events).

Supporting Oracle User Defined Types (UDTs)

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