Read and write XML

This article is mainly about reading XML data into the database, and writing data from the read database to XML, the database using MySQL

First, the brain complements the knowledge of XML:

XML: The advantage of storing data: Each language has a built-in XML file analysis engine that does not have to be written separately from the file analysis engine. XML Syntax specification: 1) must be case-sensitive 2) document can only have one root node 3) attribute value must be in double quotation marks 4) have start tag must have end tag 5) document declaration: <?xml version= "1.0" encoding= "Utf-8"?> Read data from the database written to XML: Setattributevalue and Setelementvalue when used primarily in the method

1 Static voidMain (string[] args)2         {3DataTable table =getdatatable ();4List<student> stulist =tabletolist (table);5XDocument Xdoc =NewXDocument ();6XElement root =NewXElement (" Person");7Xdoc. ADD (root);//Add root node8             foreach(Student Stuinchstulist)9             {TenXElement Stuele =NewXElement ("Student"); OneStuele.setattributevalue ("Stuid", Stu. Student_id.tostring ());//Setting Properties AStuele.setelementvalue ("name", Stu. Name);//set child nodes and values -Stuele.setelementvalue ("class", Stu. Class); -Stuele.setelementvalue ("Gender", Stu. Gender); the Root. ADD (Stuele); -             } -Xdoc. Save ("1.xml"); -Console.WriteLine ("Database Write Complete"); + Console.readkey (); -         } +         /// <summary> A         ///reading database table Data at         /// </summary> -         /// <returns></returns> -          Public StaticDataTable getdatatable () -         { -             stringConnStr = configurationmanager.connectionstrings["ConnStr"]. ConnectionString; -DataSet ds= Mysqlhelper.executedataset (CONNSTR,"SELECT * FROM Student"); in            returnDs. tables[0]; -         } to         /// <summary> +         ///convert a row to a list -         /// </summary> the         /// <param name= "table" ></param> *         /// <returns></returns> $          Public StaticList<student>tabletolist (DataTable table)Panax Notoginseng         { -list<student> list =NewList<student>(); the              for(inti =0; I < table. Rows.Count; i++) +             { AStudent stu =NewStudent (); theDataRow row=table. Rows[i]; +Stu. Class = row["Class"]. ToString (); -Stu. Gender = row["Gender"]. ToString (); $Stu. Name = row["Name"]. ToString (); $Stu. student_id = Convert.ToInt32 (row["student_id"]); - list. ADD (Stu); -             } the             returnlist; -}

Reading XML data into the database

The main method to use is item. Attribute ("Xname"). value--gets the value of the property of item. Element ("Xname"). value--gets the value of the child node

1            stringConnStr ="Server=localhost;database=test;user id=root;password=123";2XDocument Xdoc = Xdocument.load (@"F:\tmp\1.xml");3XElement root =Xdoc. Root;4             foreach(XElement IteminchRoot. Elements ())5             {6                 //Console.WriteLine (item. Element ("name"). Value);7                 //Console.WriteLine (item. Element ("Class"). Value);8                 //Console.WriteLine (item. Element ("Gender"). Value);9                 stringsql ="INSERT into student (Student_id,name,class,gender) VALUES (@Student_Id, @Name, @Class, @Gender)";TenMysqlparameter[] PS = {  One                                       NewMysqlparameter ("@Student_Id", item. Attribute ("Stuid"). Value),//Reading property values A                                       NewMysqlparameter ("@Name", item. Element ("name"). Value),//read child node values -                                       NewMysqlparameter ("@Class", item. Element ("class"). Value), -                                       NewMysqlparameter ("@Gender", item. Element ("Gender"). Value) the                                       }; -Mysqlhelper.executenonquery (CONNSTR, SQL, PS);//Insert Database -             } -Console.WriteLine ("OK"); +Console.readkey ();

Read and write XML