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The select command incorporates many of the relational operations through a series of clauses in its syntax. Each clause corresponds to specific relational operation. In SQLite, almost all of the clauses are optional, in fact, to a degree beyond what standard SQL suggests is desirable. As a user of SQL in SQLite, this empowers you to employ only the operations you need to obtain the data you seek. A very general form of select in SQLite (without too much distracting syntax) can be represented as follows: select [distinct] heading from tables where predicate group by columns having predicate order by columns limit count,offset; Each keyword from, where, having, and so on is a separate clause. Each clause consists of the keyword followed by arguments (represented in italics). From here on out, we will refer to these clauses simply by name, and you ll be able to recognize our use by the fixed-width font. So, rather than the where clause, we will simply use where. In SQLite, the best way to think of the select command is as a pipeline that processes relations. This pipeline has optional processes that you can plug into it as you need them. Regardless of whether you include or exclude a particular operation, the relative operations are always the same. Figure 3-3 shows this order. The select command starts with from, which takes one or more input relations; combines them into a single composite relation; and passes it through the subsequent chain of operations.

Remember that the child object is created the first time the property is accessed. It is easy to accidentally access a property, for example, by data binding the property to a UI. So if you want to use lazy loading, it is critical that you be very careful about how and when this property is accessed to avoid prematurely triggering the lazy load process.

Figure 8-2. The TCP-based receiver component This approach is a good shortcut for ensuring that the receiver component stays up and running. In a production setting you should implement the listening receiver component as a Windows Service component.

SELECT DISTINCT heading FROM tables WHERE predicate GROUP BY columns HAVING predicate ORDER BY columns LIMIT int,int;

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I won t fully discuss object persistence, factory methods, and the data portal until 15, so you may want to skip ahead and review those concepts and then return to the following discussion.

When using lazy loading, the code in a child class is different from normal. In fact, the child object will implement the same kind of factory and DataPortal_Fetch() as a root object. And you ll need to call MarkAsChild() manually because the data portal won t know to call it automatically on your behalf. The child factory method will look like this: Friend Function GetChild(ByVal parent As ParentType) As ChildType Return DataPortal.Fetch(Of ChildType)( _ New SingleCriteria(Of ChildType, Integer)(parent.Id)) End Function The data portal is invoked to retrieve the child object using properties from the parent object as criteria. In many cases a child object is loaded based on the parent object s unique ID value, which can be used as a foreign key, but the actual criteria values you use will depend on your specific object and data models.

Figure 3-3. The phases of select in SQLite All clauses are optional with the exception of select. You must always provide at least this clause to make a valid select command. By far the most common invocation of the select command consists of three clauses: select, from, and where. This basic syntax and its associated clauses are as follows: select heading from tables where predicate;

The StockTraderTypes.cs class file in the sample receiver project provides the IDC file that provides class representations of the StockTrader custom data types. This type information must be available to both the sender and the receiver, so it is best to compile a dedicated StockTraderTypes assembly and to reference it from both the sender and the receiver solutions. The IDC file is included as a class file in the sample so that you can more easily inspect its contents. Listing 8-9 shows an excerpt from the StockTraderTypes.cs file. Listing 8-9. The StockTraderTypes IDC File using System; using System.Xml.Serialization; namespace StockTraderTypes { [System.Xml.Serialization.XmlTypeAttribute(Namespace= "http://www.bluestonepartners.com/schemas/StockTrader/")] public class RequestQuote { public String Symbol; } [System.Xml.Serialization.XmlTypeAttribute(Namespace= "http://www.bluestonepartners.com/schemas/StockTrader/")] public class Quote { public string Symbol; public string Company; public string DateTime;

Tip Notice that a reference to the parent object is provided as a parameter rather than specific parent properties. This provides good decoupling between the parent and child because this way the parent has no idea what data is required by the child s factory method.

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