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The examples in this book use a formal data access layer created using LINQ to SQL, but the same architecture supports creation of a DAL that uses raw ADO.NET or many other data access technologies.
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advice on setting them up with overflow segments and other options. If you do not use an IOT, make sure to create an index on the NESTED_TABLE_ID column in the nested table to avoid full scanning it to find the child rows.
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namespace SerialPortWriteReadSample { public class Program { public static void Main() { SerialPort.Configuration config = new SerialPort.Configuration(SerialPort.Serial.COM1, SerialPort.BaudRate.Baud115200, false); SerialPort serialPort = new SerialPort(config); byte[] outBuffer = Encoding.UTF8.GetBytes("All right \r\n"); byte[] inBuffer = new byte[2];
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The COUNT(*) earlier in this section made me think about a new feature in Oracle 10g and above: the ability to optimize external table access by only accessing the fields in the external file that are referenced in the query. That is, if the external table is defined to have 100 number fields, but you select out only one of them, you can direct Oracle to bypass converting the other 99 strings into numbers. It sounds great, but it can cause a different number of rows to be returned from each query. Suppose the external table has 100 lines of data in it. All of the data for column C1 is valid and converts to a number. None of the data for column C2 is valid, and it does not convert into a number. If you select C1 from that external table, you ll get 100 rows back. If you select C2 from that external table, you ll get 0 rows back. You have to explicitly enable this optimization, and you should think about whether it is safe for you to use or not (only you know enough about your application and its processing to answer the question Is it safe ). Using the earlier example with the bad line of data added, we would expect to see the following output upon querying our external table:
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In 4, the data portal was implemented to support either Windows integrated (AD) or custom authentication. Either way, the result is that the current thread always has a valid principal object and associated identity object, allowing the authorization code from 3 to verify the user s roles as appropriate. When using custom authentication, the data portal requires that the custom principal object inherit from the Csla.Security.BusinessPrincipalBase class. A business application will implement its own principal and identity classes so it can authenticate the user and load the user s roles as appropriate for the application. The following shows a basic CustomPrincipal class (which makes use of a CustomIdentity class in the subsequent code):
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Table 2-6. Transaction Options Supported by Data Portal
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With the n-level undo methods complete, it is possible to implement the methods that the UI will need in order to control the edit process on a collection. Remember, though, that this control is only valid if the collection is a root object. If it s a child object, then its edit process should be controlled by its parent object. This requires a check to ensure that the object isn t a child before allowing these methods to operate: public void BeginEdit() { if (this.IsChild) throw new NotSupportedException(Resources.NoBeginEditChildException); CopyState(); } public void CancelEdit() { if (this.IsChild) throw new NotSupportedException(Resources.NoCancelEditChildException); UndoChanges(); } public void ApplyEdit() { if (this.IsChild) throw new NotSupportedException(Resources.NoApplyEditChildException); AcceptChanges(); } All three methods are very straightforward and allow developers to create a UI that starts editing a collection with BeginEdit(), lets the user interact with the collection, and then either cancels or accepts the changes with CancelEdit() or ApplyEdit(), respectively.
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Set Time Portion of Date/Time Field
1
Currently, most of the Big Four provide a distributed object programming model. In other words, they try to apply the principles of object orientation to the world of distributed applications. The problem, unfortunately, is that while object orientation is extremely successful in many types of applications, it does not translate well to distributed applications. In fact, to achieve acceptable performance and scalability out of a distributed object, you must violate some core principles of object orientation. Examples of this include creating stateless objects (an oxymoron by many object standards) and exposing a chunky interface rather than the chatty interface recommended by object orientation. Furthermore, many distributed object technologies assume a homogeneous environment and atomic deployment both of which are exceedingly rare in the real world. Despite these issues, .NET Remoting and Enterprise Services rely heavily on the object metaphor. The same can also be said for .NET Web Services in that the Web Service code generated by Visual Studio .NET implements a logical RPC interface on top of a document-based wire format. This leaves MSMQ as the only Big Four technology that eschews the distributed object mentality in favor of a pure messaging approach.2
The Problem
ZigBee is a very new technology for wireless communication. ZigBee was defined by the ZigBee Alliance (www.zigbee.org), which is comprised of the companies Phillips, Siemens, Samsung, Motorola, and Texas Instruments, among others. ZigBee is described by the industry standard IEEE 802.15.4. The name ZigBee comes from the zigzag dance honey bees use to communicate with other bees in the hive. ZigBee focuses particularly on connecting and controlling home equipment. With ZigBee, you can access and control household appliances, sensors, and actors over short distances. Concrete applications would be, for example, monitoring a smoke detector or automatically controlling a light switch in your home. The ZigBee technology sends in the frequency range of 2.4 GHz, like the two other wireless technologies. One of the primary goals of ZigBee was to work for very low-power devices. Therefore, the sensors battery life can be several months or years. The data rate with ZigBee is relatively small and amounts to 20 to 25 kilobits per second. With this technology, the low-power requirement was placed before the bandwidth. Besides, to remotely control a light switch, you do not need high transmission rates. The range of IEEE 802.15.4 is 20 to 100 meters. A ZigBee network can consist of up to 250 devices (with Bluetooth, the network can consist of only 7). ZigBee operates as WLAN on the 2.4 GHz bandwidth and can interfere with WLAN, which can be a problem in home automation control where WLAN (including Voice over IP telephony) is becoming more and more popular.
Figure 18-4. Sign extension in signed conversions
Defines data binding behaviors for collections, including change notification, sorting, and filtering (implemented by BindingList(Of T)) Defines data binding behaviors for collections to allow data binding to cancel the addition of a new child object (implemented by BindingList(Of T)) Indicates that a collection object will raise a ListChanged event to show that one of its child objects has raised a PropertyChanged event (implemented by BindingList(Of T)) Defines a CollectionChanged event to be raised by a list when the list or its items have changed (implemented by ObservableCollection(Of T)) Defines single-level undo behavior for a business object, allowing the object to behave properly with in-place editing in a DataGridView Defines an event allowing an object to notify data binding when a property has been changed Defines an event allowing an object to notify listeners when a property is about to be changed Defines properties used by the DataGridView and ErrorProvider controls to automatically show descriptions of broken validation rules within the object
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