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While an inner join returns only rows where a key value in data set A appears as a key in data set B, an outer join is used in situations when you want to return all the elements of data set A, regardless of whether the key value exists in data set B. An outer join is designated in MySQL using the LEFT JOIN syntax, with the ON clause specifying the key values on which MySQL should perform the join relationship. As we noted earlier in this chapter, the RIGHT JOIN is identical to the LEFT JOIN, but includes all elements from the data set on the right side of the ON condition. In an outer join, rows in data set B with matching key values to data set A will be returned just as an inner join; however, columns for data set B will be filled with NULL for those rows in data set A where no matching key was found in data set B. Outer joins can or must be used in a number of situations. Here, we ll go over a few examples to illustrate outer joins: Aggregating data where not all keys are present Handling valid NULL column keys Finding nonexisting keys in relationships

The upload and notify class constructor uses reflection to look at the implementing subclass s public properties. For each property, it checks the XML document for a value to assign. If there is a match between the public property s name and a field in the XML file, the field is populated with the value. Properties are provided on the abstract class for the three compulsory fields that must be provided for an invoice, but this mechanism allows the code to process data from other vendors that provide additional information. Once again, extensibility is the goal. Public MustInherit Class UploadNotify Public Sub New(ByVal xmlDoc As Xml.XmlDocument) Dim myType As Type Dim myPropertyInfos As PropertyInfo() Dim myPropertyInfo As PropertyInfo Dim xmlElt As Xml.XmlElement Dim i As Integer myType = Me.GetType() myPropertyInfos = myType.GetProperties() For Each myPropertyInfo In myPropertyInfos xmlElt = xmlDoc.SelectSingleNode("/Invoice[@" & _ myPropertyInfo.Name & "]") myPropertyInfo.SetValue(Me, _ CStr(xmlElt.GetAttribute(CStr(myPropertyInfo.Name))), _ Nothing) Next End Sub The two public methods that are called on an upload/notification class are next. First, the notification method: Public Overridable Sub RunNotification() ' The base case in no notification, do nothing End Sub Here are some utility functions the implementation is left out and we just post a message to the screen: Protected Sub SendEmail(ByVal name As String, _ ByVal emailAddr As String, _ ByVal subject As String, _ ByVal body As String) MsgBox(String.Format("Sending mail '{0}' to {1} ({2})", _ subject, name, emailAddr)) End Sub Protected Sub SendFax(ByVal name As String, _ ByVal faxNbr As String, _ ByVal subject As String, _ ByVal body As String)

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Many times, you ll run into situations where you need to aggregate data (using the GROUP BY clause), but find your SQL results are missing records that you know are in the database. The most common cause of this is the incorrect use of an INNER JOIN in the aggregating SQL. For instance, let s take the following request, received from our friends in the sales department: Please provide a report showing how many orders contained each product in our catalog, and how many items of each were purchased. Your first attempt might look like Listing 7-3. Listing 7-3. First Report Attempt with an Inner Join mysql> SELECT p.name, COUNT(*) as "# Orders", SUM(coi.quantity)"Total Qty" -> FROM Product p -> INNER JOIN CustomerOrderItem coi -> ON p.product_id = coi.product_id -> GROUP BY p.name;

Note If you are interested in implementing the first method of redundancy, many of the same steps described in this section are also required. You can see more by reading the Nagios documentation at http://nagios.sourceforge.net/docs/2_0/redundancy.html.

MsgBox(StringFormat("Sending fax '{0}' to {1} ({2})", _ subject, name, faxNbr)) End Sub The other key public method is called to import the data into the ERP system The ImportData() method of the UploadNotify class creates the connection to the ERP system and loads the data The implementation of this varies greatly from one system to another, so the specific implementation of this functionality is omitted in this example One possible way to import the data is to pass a SQL statement to the database and insert the data directly This may not be possible in a real system, as many ERPs lock the database down so modifications must be made through ERP s import API, but it suffices to show what we re doing here We provide a default implementation here, but expect that vendor-specific logic might be required, so allow this implementation to be overridden.

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