Download Essential ADO.NET by Bob Beauchemin PDF

By Bob Beauchemin

This reads like an ADO.NET person handbook the place all probabilities are pointed out yet lack reasoning and coherence within the topic. Its no longer a simple learn and used to be now not written for develoipers who must quick get to the subject as an alternative its extra for running shoes.

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The connection string identifies which data store the user wishes to log on to and identifies the user. ) The following code opens a database connection through the SqlClient and OleDb data providers. This code will look familiar if you've used a data access API. Open(); Although these connection strings are analogous, what is going on behind the scenes (and the software required to make it work) is vastly different in the two examples. In the first example, managed code is used to construct a tabular data stream (TDS) packet and ship the TDS to SQL Server.

XPath uses the hierarchical file system paradigm based on separating levels of hierarchy by forward slashes. In addition to hierarchical search, XPath can use an extended set of data axes (an axis is defined as a set of nodes relative to the current node) and contains functions, operators, parameters, and a set of well-defined implementation extensibility points. XPath queries can return nodes, sets of nodes, or scalar values. Listing 2-8 shows a sample XPath query and resultset. XPath contains a set of classes that implement an XPath parser and execution engine.

An XmlDocument is similar in concept to a DataSet, with the distinction that XmlDocument is tree-structured rather than relational-database-structured. The XmlDocument class corresponds to the W3C DOM model and provides an entire suite of navigation methods. In addition, you can update an XmlDocument in place. The XmlNode class is the base class for each information item in the document, and XmlDocument is the specialization that represents the containing document. Listing 2-9 shows the navigation methods of XmlDocument (actually XmlNode).

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