converting a dataset to an ado recordset

... need to convert a DataSet to an ADO Recordset so that you can use it in a legacy application. Solution You must persist the DataSet to XML, transform it to ADO Recordset schema, and load it ... DataSet is loaded with data for a single DataTable. The XML document for the DataSet is transformed and written into the ADO Recordset XML document. 4. An ADO Recordset object is created and ... xmlDoc.LoadXml(adoXml); // Create a namespace manager for the XML document. XmlNamespaceManager nm = new XmlNamespaceManager(xmlDoc.NameTable); // Add ADO prefixes. nm.AddNamespace("s",...

Ngày tải lên: 14/12/2013, 18:16

... interop. While the data can be loaded into a DataSet in this way, there is no way to reconcile the changes made to the data in the DataSet with the data source underlying the ADO object. This ... Discussion One of the overloads of the OLE DB .NET DataAdapter.Fill( ) method accepts an ADO Recordset or Record object. The COM component that returns an ADO Recordset or Record object is ... DataTable dt = new DataTable("Orders"); (new OleDbDataAdapter( )).Fill(dt, rs); conn.Close( ); // Bind the default view of the dt to the grid. dataGrid.DataSource = dt.DefaultView;...

Ngày tải lên: 14/12/2013, 18:16

... You can use this table [ Team LiB ] Recipe 5.3 Converting a DataReader to a DataSet Problem You need to transfer data from a DataReader to a DataSet. Solution Create a DataTable schema ... DataReader. while(dr.Read( )) { // Read the row from the DataReader into an array. dr.GetValues(aData); // Add the row from the array to the DataTable. dataTable.Rows.Add(aData); } } } ... the data store. BaseColumnName The name of the column in the data store. BaseSchemaName The name of the schema in the data store. BaseTableName The name of the table in the data store. DataType...

Ngày tải lên: 07/11/2013, 13:15

... Edit Data and Update Changes That Are Made to an ADO. NET DataSet Object Listing and viewing data is easy. What you really need to do is to be able to edit and update data. You know you can use ... DataSet and DataTable objects. CommandBuilde r GetUpdateComman d Creates an Update command and places it into the data adapter's UpdateCommand property. DataAdapter UpdateCommand Holds ... and methods that are shown in Table 4.1. Table 4.1. DataAdapter, DataSet, DataTable, and DataRow Properties and Methods Object /Method Property Description DataAdapter Fill Fills DataSet and...

Ngày tải lên: 24/12/2013, 06:17

... an XmlReader object CreateParameter( ) Creates a SqlXmlParameter object used to pass parameters to a command using the Name and Value properties ClearParameters( ) Clears SqlXmlParameter objects ... Fills a DataSet with the XML data retrieved from the SQL Server database Update Updates the SQL Server database with the changes made to the DataSet For more information about the SQLXML Managed ... <sql:param> tag with the name attribute used to specify the parameter name and the parameter default value optionally specified between the <sql:param> and <sql:param> tags. Parameter...

Ngày tải lên: 21/01/2014, 11:20

... representation in an XmlDataDocument object. The synchronized DataSet and XmlDataDocument work with a single set of data. The solution shows three ways to synchronize a DataSet with an XmlDataDocument: ... Populate a DataSet with both schema and data. Synchronize it with a new XmlDataDocument, initializing it with the DataSet in the constructor. Method 2 Populate a DataSet with a schema but no data. ... schema to be synchronized must match those in the XmlDataDocument. Method 3 Create a new XmlDataDocument and access its DataSet through the DataSet property. Populate the schema for the DataSet. ...

Ngày tải lên: 21/01/2014, 11:20

... of a Query to an Array Problem You need to export the results of a query to an array in a manner similar to the GetRows( ) method of the ADO Recordset. Solution Write a routine to mimic the ... functionality of the ADO Recordset& apos;s GetRows( ) method. The sample code contains an event handler and a method: Go Button.Click Sets up the sample by creating a DataTable containing the ... rows and columns in the table and sets the values in the array to the field values. The C# code is shown in Example 5-14 . Example 5-14. File: AdoGetRowsForm.cs // Namespaces, variables, and...

Ngày tải lên: 26/01/2014, 10:20

Ngày tải lên: 18/03/2014, 01:20

Ngày tải lên: 11/06/2014, 05:26

... sample code contains two event handlers and a single method: Form.Load Sets up the sample by loading the Categories table from Northwind into a DataSet and displays the DiffGram for the DataSet ... You want to get the original values and see which rows were added, edited, or deleted. Solution Create an XML DiffGram, which is a document that details the modifications made to a DataSet. ... Team LiB ] Recipe 8.8 Creating an XML File That Shows Changes Made to a DataSet Problem When you use the GetXML( ) method of the DataSet, you may see only the current values in the DataSet. ...

Ngày tải lên: 21/01/2014, 11:20

... mammalian hosts. These animals, usually pigs, act as a transformer or converters; creating a strain that can more readily infect humans. Pigs can be infected with both avian and human influenza A ... an intestinal virus change to that of a respiratory airborne-virus that is adapted to the mammalian lung? Second, the viruses must adapt to environmental changes, able to withstand temperate, ... infects mammalian hosts. These animals, usually pigs, act as a transformer or converters; creating a strain that can more readily infect humans. Therefore swine can be infected with both avian and...

Ngày tải lên: 02/11/2012, 11:12

Ngày tải lên: 06/11/2012, 10:35

Ngày tải lên: 06/11/2012, 10:35

... guides, and then produce an essay through answering a set of questions. Minor changes and substitutions of blank space, punctuation marks, and capitalization are also added to expand an outline ... learners to write a paragraph before they started writing an essay. It was easier to start writing with a paragraph (topic sentence and supporting ones). An essay is a combination of paragraphs. ... practice of English Language Teaching, Longman handbooks for language teacher: Longman group, ltd. 15. Heaton, J. B.1989. Writing English test, Longman handbooks for language teacher: Longman...

Ngày tải lên: 06/11/2012, 10:35

... career preparation and increased knowledge. I think that these are the most common reasons. The first reason will begin with career preparation. Many learners go to university or college want ... in life and best advice. However, children need to learn from other sources. WRITING PAPER Name: Group A Paper: 02F6g Task: 02 AD Write: It’s said that parents are always the best teachers but ... work hard to earn money to pay their children’s fee at school. They buy their son or daughter with good food; make a good house where their children can come back to. Also parents want to choose...

Ngày tải lên: 06/11/2012, 10:35

Ngày tải lên: 06/12/2013, 19:34

Ngày tải lên: 22/12/2013, 08:58

... how to delete columns from a data table. 2. If the goal is to include all the columns in the table and accept the Password column, then when other columns are added, you will not have to touch ... is called, passing the username once again. The first table from the returned dataset is assigned to the DataSource property of dgUsers. Listing 13.6 frmHowTo13_4.vb: Retrieving a Dataset ... because the * is being used. Tip When referring to tables on the receiving end, as displayed in step 2 of this How -To, you have to refer to tables in the dataset by their ordinal values....

Ngày tải lên: 24/12/2013, 06:17

... 80. ' Have the command builder create an Insert SQL command 81. modaCustIndiv.InsertCommand = ocbCustIndiv.GetInsertCommand 82. Else 83. ' Have the command builder create an update ... editing and updating a record using ADO. NET. Using the commands in this How -To and the prior one, you can set it up to handle updating and canceling of multiple records as well. 3. Add the following ... following code to the Click event btnCancel. 105. Private Sub btnCancel_Click(ByVal sender As System.Object, _ 106. ByVal e As System.EventArgs) Handles btnCancel.Click 107. 108. ' Cancel the...

Ngày tải lên: 21/01/2014, 12:20

... Team LiB ] Recipe 4.10 Updating a DataSet with a Many -to- Many Relationship Problem You have a DataSet that contains two tables that have a many -to- many relationship between them using a ... value in the DataSet. The DataSet will then automatically cascade this new value to the child records. [ Team LiB ] child, and many -to- many junction table, as well as the DataRelation objects ... ) method is called to update the changes made to the DataSet with the Example 4-24. Example 4-24. File: UpdateManyToManyRelationshipForm.cs // Namespaces, variables, and constants using System;...

Ngày tải lên: 26/01/2014, 10:20