Ado.net session11
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  • Introduce the students to the course by asking them what they know about forensics. Next, ask the students what they know about system forensics and why is it required in organizations dependent on IT. This could be a brief discussion of about 5 minutes. Lead the discussion to the objectives of this chapter.
  • Introduce the students to the course by asking them what they know about forensics. Next, ask the students what they know about system forensics and why is it required in organizations dependent on IT. This could be a brief discussion of about 5 minutes. Lead the discussion to the objectives of this chapter.
  • Introduce the students to the course by asking them what they know about forensics. Next, ask the students what they know about system forensics and why is it required in organizations dependent on IT. This could be a brief discussion of about 5 minutes. Lead the discussion to the objectives of this chapter.
  • Introduce the students to the course by asking them what they know about forensics. Next, ask the students what they know about system forensics and why is it required in organizations dependent on IT. This could be a brief discussion of about 5 minutes. Lead the discussion to the objectives of this chapter.
  • Introduce the students to the course by asking them what they know about forensics. Next, ask the students what they know about system forensics and why is it required in organizations dependent on IT. This could be a brief discussion of about 5 minutes. Lead the discussion to the objectives of this chapter.
  • Introduce the students to the course by asking them what they know about forensics. Next, ask the students what they know about system forensics and why is it required in organizations dependent on IT. This could be a brief discussion of about 5 minutes. Lead the discussion to the objectives of this chapter.
  • Introduce the students to the course by asking them what they know about forensics. Next, ask the students what they know about system forensics and why is it required in organizations dependent on IT. This could be a brief discussion of about 5 minutes. Lead the discussion to the objectives of this chapter.
  • Introduce the students to the course by asking them what they know about forensics. Next, ask the students what they know about system forensics and why is it required in organizations dependent on IT. This could be a brief discussion of about 5 minutes. Lead the discussion to the objectives of this chapter.
  • Introduce the students to the course by asking them what they know about forensics. Next, ask the students what they know about system forensics and why is it required in organizations dependent on IT. This could be a brief discussion of about 5 minutes. Lead the discussion to the objectives of this chapter.
  • Introduce the students to the course by asking them what they know about forensics. Next, ask the students what they know about system forensics and why is it required in organizations dependent on IT. This could be a brief discussion of about 5 minutes. Lead the discussion to the objectives of this chapter.
  • Introduce the students to the course by asking them what they know about forensics. Next, ask the students what they know about system forensics and why is it required in organizations dependent on IT. This could be a brief discussion of about 5 minutes. Lead the discussion to the objectives of this chapter.
  • Introduce the students to the course by asking them what they know about forensics. Next, ask the students what they know about system forensics and why is it required in organizations dependent on IT. This could be a brief discussion of about 5 minutes. Lead the discussion to the objectives of this chapter.
  • Introduce the students to the course by asking them what they know about forensics. Next, ask the students what they know about system forensics and why is it required in organizations dependent on IT. This could be a brief discussion of about 5 minutes. Lead the discussion to the objectives of this chapter.
  • Introduce the students to the course by asking them what they know about forensics. Next, ask the students what they know about system forensics and why is it required in organizations dependent on IT. This could be a brief discussion of about 5 minutes. Lead the discussion to the objectives of this chapter.
  • Introduce the students to the course by asking them what they know about forensics. Next, ask the students what they know about system forensics and why is it required in organizations dependent on IT. This could be a brief discussion of about 5 minutes. Lead the discussion to the objectives of this chapter.
  • Introduce the students to the course by asking them what they know about forensics. Next, ask the students what they know about system forensics and why is it required in organizations dependent on IT. This could be a brief discussion of about 5 minutes. Lead the discussion to the objectives of this chapter.
  • Introduce the students to the course by asking them what they know about forensics. Next, ask the students what they know about system forensics and why is it required in organizations dependent on IT. This could be a brief discussion of about 5 minutes. Lead the discussion to the objectives of this chapter.
  • Introduce the students to the course by asking them what they know about forensics. Next, ask the students what they know about system forensics and why is it required in organizations dependent on IT. This could be a brief discussion of about 5 minutes. Lead the discussion to the objectives of this chapter.
  • Introduce the students to the course by asking them what they know about forensics. Next, ask the students what they know about system forensics and why is it required in organizations dependent on IT. This could be a brief discussion of about 5 minutes. Lead the discussion to the objectives of this chapter.
  • Introduce the students to the course by asking them what they know about forensics. Next, ask the students what they know about system forensics and why is it required in organizations dependent on IT. This could be a brief discussion of about 5 minutes. Lead the discussion to the objectives of this chapter.
  • Introduce the students to the course by asking them what they know about forensics. Next, ask the students what they know about system forensics and why is it required in organizations dependent on IT. This could be a brief discussion of about 5 minutes. Lead the discussion to the objectives of this chapter.
  • Introduce the students to the course by asking them what they know about forensics. Next, ask the students what they know about system forensics and why is it required in organizations dependent on IT. This could be a brief discussion of about 5 minutes. Lead the discussion to the objectives of this chapter.
  • Introduce the students to the course by asking them what they know about forensics. Next, ask the students what they know about system forensics and why is it required in organizations dependent on IT. This could be a brief discussion of about 5 minutes. Lead the discussion to the objectives of this chapter.
  • Introduce the students to the course by asking them what they know about forensics. Next, ask the students what they know about system forensics and why is it required in organizations dependent on IT. This could be a brief discussion of about 5 minutes. Lead the discussion to the objectives of this chapter.

Ado.net session11 Presentation Transcript

  • 1. Developing Database Applications Using ADO.NET and XMLObjectives In this session, you will learn to: Read, write, validate, and modify XML data by using the XML reader and writer classes Ver. 1.0 Session 11 Slide 1 of 24
  • 2. Developing Database Applications Using ADO.NET and XMLProcessing XML Data • You can process XML data in your .NET applications using the System.Xml namespace. • The System.Xml namespace contains many classes to write and read XML documents. • Using these classes, you can create an XML document, process an XML document, validate an XML document, and so on. Ver. 1.0 Session 11 Slide 2 of 24
  • 3. Developing Database Applications Using ADO.NET and XMLWriting XML Data • The XmlWriter class in the System.Xml namespace provides non-cached, forward-only, and write-only access to XML data. • XmlWriter objects are created using the Create() method. • You can pass an object of XmlWriterSettings class to the Create()method in order to specify the settings or properties, which you want to enable on the XmlWriter object. If an XmlWriterSettings is not passed as a parameter, the default settings are applied. • The following line of code snippet creates an XmlWriter object that creates an XML file called myXmlFile.xml: XmlWriter writer = XmlWriter.Create(“myXmlFile.xml”,settings); Ver. 1.0 Session 11 Slide 3 of 24
  • 4. Developing Database Applications Using ADO.NET and XMLJust a minute Fill in the blanks: The __________ namespace in .NET contains XML classes. Answer: System.Xml Ver. 1.0 Session 11 Slide 4 of 24
  • 5. Developing Database Applications Using ADO.NET and XMLWriting XML Data (Contd.) An XML file includes elements, attributes and comments. Elements Attributes Comments • All these can be created by using various methods of XmlWriter class. Ver. 1.0 Session 11 Slide 5 of 24
  • 6. Developing Database Applications Using ADO.NET and XMLWriting XML Data (Contd.) Elements can be created in two ways:  By calling the The WriteElementString()method takes WriteElementString() two value of the element. of the element and the parameters, the name method writer.WriteElementString(“Name”, “Peter”); Here, writer is an object of XmlWriter, Name is the name of the element and Peter is the value of the element.  By calling the The WriteStartElement() method takes the name of the element as a parameter. The WriteStartElement() WriteString() method to specify a value for method this element. The WriteEndElement() method to end the element tag. writer.WriteStartElement(“Name”); writer.WriteString(“Peter”); writer.WriteEndElement(); Ver. 1.0 Session 11 Slide 6 of 24
  • 7. Developing Database Applications Using ADO.NET and XMLJust a minute • What is the code snippet to store the value of an integer type variable named Age into an XML file? Answer:  //writer is an object of XmlWriter writer.WriteElementString(“Age”,XmlConvert.To String(Age)); Ver. 1.0 Session 11 Slide 7 of 24
  • 8. Developing Database Applications Using ADO.NET and XMLWriting XML Data (Contd.) Attributes can be created in two ways:  By calling the This method takes the name of the attribute and the value of the attribute as WriteAttributeString() parameters. method //writer is an object of //XmlWriter writer.WriteAttributeString(“O rderID”,“O001”); In the preceding code snippet, an attribute OrderID with the value  By calling the O001 is created. WriteStartAttribute() This method takes the name of the method attribute as a parameter. The WriteString() method writes the value of the attribute. The WriteEndAttribute() method ends the attribute tag. writer.WriteStartAttribute("Or derID"); writer.WriteString("O001"); Ver. 1.0 Session 11 writer.WriteEndAttribute();8 of 24 Slide
  • 9. Developing Database Applications Using ADO.NET and XMLWriting XML Data (Contd.) Comments can be created in the following way:  By calling the This method takes a string as a parameter. This string is written as a WriteComment() comment in the XML file. The following method code snippet writes a comment into an XML file: //writer is an object of XmlWriter writer.WriteComment(“This XML file stores product details”); The text This XML file stores product details will be written within the <!-- and --> tags in the XML file. Ver. 1.0 Session 11 Slide 9 of 24
  • 10. Developing Database Applications Using ADO.NET and XMLJust a minute Fill in the blanks:  The __________ method of the XmlWriter class is used to write comments into an XML file. Answer: WriteComment() Ver. 1.0 Session 11 Slide 10 of 24
  • 11. Developing Database Applications Using ADO.NET and XMLWriting XML Data (Contd.) An XML file can be created in the following ways:  Using XmlWriter  Using XmlTextWriter  Saving a Dataset as XML data Ver. 1.0 Session 11 Slide 11 of 24
  • 12. Developing Database Applications Using ADO.NET and XMLJust a minute Fill in the blanks:  The _______ option of XmlWriteMode write the contents of the dataset as XML data with the dataset structure as an inline schema. Answer: WriteSchema Ver. 1.0 Session 11 Slide 12 of 24
  • 13. Developing Database Applications Using ADO.NET and XMLReading XML Data • The XmlReader class in the System.Xml namespace provides non-cached, forward-only, and read-only access to XML data. • XmlReader objects are created using the Create() method. • You can pass an object of XmlReaderSettings class to the Create()method in order to specify the settings or properties, which you want to enable on the XmlReader object. If an XmlReaderSettings is not passed as a parameter, the default settings are applied. • The following code snippet creates an XmlReader object, which reads an XML file called books.xml: XmlReader reader = null; reader = XmlReader.Create("C:books.xml", settings); Ver. 1.0 Session 11 Slide 13 of 24
  • 14. Developing Database Applications Using ADO.NET and XMLReading XML Data (Contd.) An XML file can be read by using the following classes: XmlReader XmlTextReader Ver. 1.0 Session 11 Slide 14 of 24
  • 15. Developing Database Applications Using ADO.NET and XMLJust a minute Fill in the blanks:  The _______ method of the XmlTextReader class reads the content of an element or text node in a string. Answer: ReadString() Ver. 1.0 Session 11 Slide 15 of 24
  • 16. Developing Database Applications Using ADO.NET and XMLValidating XML Data An XML file can be validated against a schema using the following two classes: XmlReader XmlValidatingReader Ver. 1.0 Session 11 Slide 16 of 24
  • 17. Developing Database Applications Using ADO.NET and XMLValidating XML Data (Contd.) • The following code snippet validates an XML file against a schema using XmlReader: XmlSchemaSet schemaSet = new Create the XmlSchemaSet XmlSchemaSet(); class. schemaSet.Add("urn:product Add the schema to the collection. -schema",C:products.xsd"); Set the validation settings. XmlReaderSettings settings = new XmlReaderSettings(); settings.ValidationType = ValidationType.Schema; settings.Schemas = schemaSet; Associate the ValidationEventHandler settings.ValidationEventHandler to detect validation errors. += new alidationEventHandler (ValidationCallBack); Ver. 1.0 Session 11 Slide 17 of 24
  • 18. Developing Database Applications Using ADO.NET and XMLValidating XML Data (Contd.) XmlReader reader = Create the XmlReader XmlReader.Create object. ("C:products.xml“,settings); while (reader.Read()); Parse the file Console.ReadLine(); Ver. 1.0 Session 11 Slide 18 of 24
  • 19. Developing Database Applications Using ADO.NET and XMLValidating XML Data (Contd.) • The following code snippet validates an XML file against a schema using XmlValidatingReader: XmlTextReader reader = new Read the products.xml file. XmlTextReader ("C:products.xml"); XmlValidatingReader Add validation support the validatingReader = new XmlTextReader object. XmlValidatingReader(reader); validatingReader.ValidationType Set validation type as Schema. = ValidationType.Schema; Ver. 1.0 Session 11 Slide 19 of 24
  • 20. Developing Database Applications Using ADO.NET and XMLModifying XML Data Using DiffGrams DiffGram: Is an XML format that identifies current and original versions of data elements. Preserves information about changes to the data in the dataset so that you can choose whether to accept or reject the changes when you read the XML data back to the dataset. Is created in the following way: ds.WriteXml("C:Employee DataSet object Details.xml", Name of the XML file XmlWriteMode.DiffGram); Ver. 1.0 Session 11 Slide 20 of 24
  • 21. Developing Database Applications Using ADO.NET and XMLDemo: Manipulating XML Data Problem Statement: Tebisco has its central office in New York and several branch offices across the United States. Tebisco collaborates with various recruitment agencies for hiring purposes. Currently, only the HR management team at the central office is provided with the details of the recruitment agencies. In addition, only the central office interacts with these recruitment agencies. If the branch offices need to interact with the recruitment agencies, they first have to interact with the central office. However, this process is taking time and, therefore, it has been decided to send the details of the recruitment agencies to the branch offices in a suitable format. Ver. 1.0 Session 11 Slide 21 of 24
  • 22. Developing Database Applications Using ADO.NET and XMLDemo: Manipulating XML Data (Contd.) You are a developer in Tebisco. You have been asked to create an application that will retrieve the records stored in the RecruitmentAgencies table into a dataset and perform the following tasks: 1. Save the dataset as XML. 2. Save the dataset as a DiffGram. Ver. 1.0 Session 11 Slide 22 of 24
  • 23. Developing Database Applications Using ADO.NET and XMLSummary In this session, you learned that:  System.Xml namespace contains XML classes. This namespace contains many classes to read and write XML documents.  The XmlWriter class in the System.Xml namespace provides non-cached, forward-only, and write-only access to XML data. This class can be used to write either a stream of data or a text data.  The XmlReader class in the System.Xml namespace provides non-cached, forward-only, and read-only access to XML data. If the XML file is not well formed, the XmlReader raises an XmlException. Ver. 1.0 Session 11 Slide 23 of 24
  • 24. Developing Database Applications Using ADO.NET and XMLSummary (Contd.) An XML document can be validated against a schema by using the following two classes:  XmlReader  XmlValidatingReader  A DiffGram is an XML format that identifies current and original versions of data elements. Ver. 1.0 Session 11 Slide 24 of 24