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The SqlCommand class performs no preliminary check on the structure of the T-SQL command being executed to statically determine whether the command returns XML data. This means that any error that invalidates the operation is detected on the server. A client-side check could verify that the command text incorporates a correct FOR XML clause prior to sending the text to the database. However, such a test would also catch as erroneous a perfectly legitimate situation: selecting XML data from a text or a BLOB field. So while performing a preliminary check could still make sense for some user applications, it would be ineffective if done from within the command class. Note Although the ExecuteXmlReader method returns a generic XmlReader object, the true type of the returned object is always XmlTextReader. You can use this object at will for example, to create a validating reader. Bear in mind, however, that the more you use the XML reader, the longer the connection stays open.

Figure 12.7 Configuring the TeamCity build agent. Pay close attention to the ownPort variable (the port needs to be open for communication) and the serverUrl variable (it s the TeamCity server location).

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The DataReader object is a highly optimized, read-only, forward-only firehose that allows you to read through records sequentially, from front to back For example, one of the most common Web application tasks is displaying the results of a query In the vast majority of Web applications, none of the records returned will be updated The read-only, forward-only DataReader object is perfect for this type of application The DataAdapter object acts as a bridge between a DataSet object and a data source for retrieving and saving data The Fill method of DataAdapter (or SqlDataAdapter for SQL Server data sources) fills the DataSet object with the requested data from a data source The Update method changes the data in the data source to match that in DataSet The nature of ASPNET applications doesn t lend itself to using this model.

The application shown in Figure 8-2 uses the schema we analyzed in the section "The FOR XML EXPLICIT Mode," on page 356, while examining the FOR XML EXPLICIT clause. The application runs the same SELECT command we used in that section and then walks its way through the result set using an XML reader. The information read is used to fill up a treeview control.

Build agents in TeamCity are characterized using system properties and environment variables. You can freely set the requirements for build agents at the project level. For example, you can say that you want your build to run only on Windows machines with .NET Framework 4.0 installed. Let s configure a project to do so:

Figure 8-2: The application retrieves data from SQL Server using an explicit schema, reads the information through an XML reader, and populates a treeview control. The following code illustrates how to extract information from the previously described schema and add nodes to the treeview. The ProcessXmlData routine has an extra Boolean argument used to specify whether you want the application's user interface to be generic. If the user interface is not generic, it makes assumptions about the structure of the XML data and attributes specific semantics to each element. If the user interface is generic, the sample application treats the data as a generic XML stream. void ProcessXmlData(XmlTextReader reader, bool bUseGenericMode) { // Clear the treeview dataTree.Nodes.Clear(); dataTree.BeginUpdate(); 295

For example, data is often displayed when a page is initially visited, and changes are applied when the page is posted back In such situations, allowing a single data object to handle transport to and from the data source is of little benefit The biggest constraint that ADO has to work with is the limitations imposed by ADO s use of COM The most significant of these limitations is the limited number of data types supported If an ADO recordset needed to contain an object, it had to be somehow marshaled as one of the COM data types ADONET uses XML as its data transport, and so ADONET can take advantage of the way XML data can be self-describing In addition, and important for corporate developers, transporting ADO recordsets through firewalls is problematic since most firewalls are configured to prevent COM marshaling ADO.

// Process elements while(reader.Read()) { if(reader.NodeType == XmlNodeType.Element) { // Creates an hash table of nodes at various // depths so that each element can figure out // what its parent is int depth = reader.Depth; int parentDepth = depth -1; string text = ""; if (m_ParentNodes.ContainsKey(parentDepth)) { TreeNode n = (TreeNode) m_ParentNodes[parentDepth]; text = PrepareOtherDataDisplayText(reader, bUseGenericMode); m_ParentNodes[depth] = n.Nodes.Add(text); } else { // Only first-level nodes text = PrepareEmployeeDisplayText(reader, bUseGenericMode); m_ParentNodes[depth] = dataTree.Nodes.Add(text); } } } dataTree.EndUpdate(); } Figure 8-3 shows the user interface in generic mode.

Go to the build configuration, and choose the seventh wizard step: Agent Requirements. Add two system property requirements for the build, as shown in figure 12.10 (you can use the Frequently Used Requirements link on the page if you wish).

NET can pass results though firewalls because it s a text protocol that can take advantage of commonly open ports Speaking of the ADO recordset object, where is the ADONET recordset equivalent In ADO, the recordset is the Swiss army knife of the database developer Need to get records Use a recordset Need to delete records Use a recordset Need to add records You get the idea The recordset is used in all these situations The closest ADONET equivalent to an ADO recordset is the DataSet object Using DataSet, you can add and update records The DataSet object keeps track of the state of.

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