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CHAPTER 7 XML IN A DO.NE T
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Up until now, all the changes that we made are saved in the DataSet only; they are yet to be committed back to the database. You can test this by making some changes to the records and then closing the application without clicking the Save button. You will observe that the changes are lost. The Click event handler of the Save button contains code that propagates changes from the DataSet back to the database. Listing 7-10 shows this code. Listing 7-10. Saving the DataSet Changes to the Database private void button4_Click(object sender, EventArgs e) { SqlCommand cmdInsert = new SqlCommand(); SqlCommand cmdUpdate = new SqlCommand(); SqlCommand cmdDelete = new SqlCommand(); cmdInsert.Connection = cnn; cmdUpdate.Connection = cnn; cmdDelete.Connection = cnn; cmdInsert.CommandText = "INSERT INTO employees(firstname,lastname,homephone,notes) VALUES(@fname,@lname,@phone,@notes)"; cmdUpdate.CommandText = "UPDATE employees SET firstname=@fname,lastname=@lname,homephone=@phone WHERE employeeid=@empid"; cmdDelete.CommandText = "DELETE FROM employees WHERE employeeid=@empid"; SqlParameter[] pInsert = new SqlParameter[4]; pInsert[0] = new SqlParameter("@fname", SqlDbType.VarChar); pInsert[0].SourceColumn = "firstname"; pInsert[1] = new SqlParameter("@lname", SqlDbType.VarChar); pInsert[1].SourceColumn = "lastname"; pInsert[2] = new SqlParameter("@phone", SqlDbType.VarChar); pInsert[2].SourceColumn = "homephone"; pInsert[3] = new SqlParameter("@notes", SqlDbType.VarChar); pInsert[3].SourceColumn = "notes"; foreach (SqlParameter p in pInsert) { cmdInsert.Parameters.Add(p); }
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SqlParameter[] pUpdate = new SqlParameter[5]; pUpdate[0] = new SqlParameter("@fname", SqlDbType.VarChar); pUpdate[0].SourceColumn = "firstname"; pUpdate[1] = new SqlParameter("@lname", SqlDbType.VarChar); pUpdate[1].SourceColumn = "lastname"; pUpdate[2] = new SqlParameter("@phone", SqlDbType.VarChar); pUpdate[2].SourceColumn = "homephone"; pUpdate[3] = new SqlParameter("@notes", SqlDbType.VarChar); pUpdate[3].SourceColumn = "notes"; pUpdate[4] = new SqlParameter("@empid", SqlDbType.VarChar); pUpdate[4].SourceColumn = "employeeid"; foreach (SqlParameter p in pUpdate) { cmdUpdate.Parameters.Add(p); } SqlParameter[] pDelete = new SqlParameter[1]; pDelete[0] = new SqlParameter("@empid", SqlDbType.VarChar); pDelete[0].SourceColumn = "employeeid"; foreach (SqlParameter p in pDelete) { cmdDelete.Parameters.Add(p); } da.InsertCommand = cmdInsert; da.UpdateCommand = cmdUpdate; da.DeleteCommand = cmdDelete; da.Update(ds,"Employees"); ds.AcceptChanges(); } The code creates three SqlCommand objects for INSERT, UPDATE, and DELETE operations, respectively. The Connection property of these SqlCommand objects is set to the same SqlConnection object that we declared at the top initially. The CommandText property of each SqlCommand is set to the corresponding SQL statement. Note the use of the @ character to represent parameters. For each of these parameter placeholders, a SqlParameter object needs to be created. This is done by declaring three arrays of the SqlParameter class: pInsert, pUpdate, and pDelete.
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CHAPTER 7 XML IN A DO.NE T
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Then each array element is instantiated as a SqlParameter object by passing the parameter name and parameter data type in the constructor of the SqlParameter class. The SourceColumn property of SqlParameter specifies the name of the DataColumn that will be supplying the value for the parameter. All the parameters from the corresponding arrays are added to the Parameters collection of the respective SqlCommand object. These three SqlCommand objects are assigned to the InsertCommand, UpdateCommand, and DeleteCommand properties of the SqlDataAdapter instance that we declared at the top. The Update() method of the SqlDataAdapter class is then called and takes all the changes inserts, updates, and deletes from the DataSet back to the database. The Update() method takes two parameters: the DataSet to be updated, and the name of the DataTable from the DataSet that is to be updated. After the changes are saved to the underlying database, the RowState properties of all the DataRow objects must become Unchanged. This is done by calling the AcceptChanges() method of the DataSet class. That s it! You can now run the application and test it for the expected functionality.
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One of the powerful features of the DataSet class is that you can serialize it in XML format, which means that relational data can be saved in XML format. This feature comes in handy while working in offline mode and transporting data to heterogeneous systems. The WriteXml() method of the DataSet class writes the contents of the DataSet to a stream or physical file in XML format. Optionally, you can also add schema information. To illustrate the use of WriteXml(), you need to create an application like the one shown in Figure 7-6.
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Figure 7-6. Application that writes DataSet contents as an XML file The application consists of a text box for specifying the path of the output XML file. The first two radio buttons specify whether schema information is to be included. The last radio button specifies whether you wish to write the original as well as current values to the file. If you select this radio button, the DiffGram of the original and current values is written in the file.
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