writing and reading xml using a dataset object
Tài liệu Writing and Reading XML Using a DataSet Object ppt
... "ORDER BY CustomerID"; SqlDataAdapter mySqlDataAdapter = new SqlDataAdapter(); mySqlDataAdapter.SelectCommand = mySqlCommand; DataSet myDataSet = new DataSet( ); mySqlConnection.Open(); ... Chapter 16, " ;Using SQL Server's XML Support." Using the WriteXml() Method Let's say you have a DataSet object named myDataSet. Assume that myDataSet has a DataTable that ... "ORDER BY CustomerID"; SqlDataAdapter mySqlDataAdapter = new SqlDataAdapter(); mySqlDataAdapter.SelectCommand = mySqlCommand; DataSet myDataSet = new DataSet( ); mySqlConnection.Open();...
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Tài liệu Creating a DataSet Object Using Visual Studio .NET docx
... Creating a DataSet Object Using Visual Studio .NET In this section, you'll learn how to create a DataSet using Visual Studio .NET. Note You'll find a completed VS .NET example ... form, and add code to your form to fill it using the Fill() method of a DataAdapter object. • Click the Generate Dataset link at the bottom of the Properties window of your DataAdapter. You can ... You'll use the second step, so go ahead and click the Generate Dataset link. The Generate Dataset dialog box is then displayed, as shown in Figure 10.14. Figure 10.14: The Generate Dataset...
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Practice Tests in Grammar,Writing, and Reading Comprehension
... standsfrowning and twisting a silver bracelet around and around on her wrist. She is an attractiveyoung woman, although perhaps too thin and with a look that is faintly ascetic; her face isnarrow and ... following narrative about an afternoon of workshared by a son and his father.So, for hours my dad and I worked. We clearedout and sorted all the junk, ripped down thecardboard that made the walls, ... that follows it.Weather maps, graphs, charts, and tables are allconfusing to read.10. CSHurricanes are dangerous storms costingthousands of dollars to homeowners in repaircosts each year....
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Using a DataReader Object in Visual Studio .NET
... from a SqlCommand object, which you saw how to create using VS .NET in the previous chapter. That SqlCommand object contained a SELECT statement that retrieved the CustomerID, CompanyName, and ... Start Without Debugging. Figure 9.4 shows the running form. Figure 9.4: The running form Using a DataReader Object in Visual Studio .NET You can't visually create a DataReader object ... object. For my installation of SQL Server, the password to access the Northwind database is sa, and my ConnectionString property is set to: data source=localhost;initial catalog=Northwind;persist...
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Using a SqlConnection Object to Connect to a SQL Server Database phần 1
... ADO.NET automatically stores database connections in a pool. Connection pooling offers a great performance improvement because you don't have to wait for a brand new connection to the database ... established when there's a suitable connection already available. When you close a connection, that connection isn't actually closed; instead, your connection is marked as unused and ... "Creating a Connection Object using Visual Studio .NET" section. Next, you'll see how to open and close a connection. Opening and Closing a Database Connection Once you've created...
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Tài liệu Using a SqlConnection Object to Connect to a SQL Server Database phần 2 doc
... System; using System.Data; using System.Data.SqlClient; class StateChange { // define the StateChangeHandler() method to handle the // StateChange event public static void StateChangeHandler( ... mySqlConnection.StateChange += new StateChangeEventHandler(StateChangeHandler); Whenever the StateChange event fires, the StateChangeHandler() method will be called, which displays the original and current ... StateChange event using the StateChangeHandler() method mySqlConnection.StateChange += new StateChangeEventHandler(StateChangeHandler); // open mySqlConnection, causing the State to change...
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Tài liệu Navigating Between Parent and Child Records Using a DataRelation pptx
... [ Team LiB ] Recipe 3.4 Navigating Between Parent and Child Records Using a DataRelation Problem You want to navigate between the parent and child records in a hierarchical DataSet. Solution ... Use a DataRelation to find the child rows for a parent row in a related table, or to find the parent row for a child row in a related table. The sample code starts by creating a DataSet containing ... row as a DataRow object for a specified DataRelation. Again, an optional second argument allows a specific version of the data to be returned. The GetParentRows( ) method can also be called...
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Tài liệu Updating a Database Using a DataSet doc
... it again. The DataSet in this case is referred to as a disconnected DataSet as it doesn't maintain an active connection to the database. Disconnected DataSet objects act as a data cache ... time. Instead, a better approach is to connect to the database, fetch the data into a DataSet object, and then disconnect again. The user can browse the data in the DataSet and make any changes ... in applications. You can modify the data in the DataSet, and later reopen the connection and send the changes back to the database. You can manually open a connection to a database by creating...
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Tài liệu Reading Rows from a SqlDataReader Object docx
... The reason for this is that a DataReader object ties up the Connection object, and no other commands can be executed while there is an open DataReader for that Connection. The following example ... "server=localhost;database=Northwind;uid=sa;pwd=sa" ); SqlCommand mySqlCommand = mySqlConnection.CreateCommand(); mySqlCommand.CommandText = "SELECT TOP 5 ProductID, ProductName, UnitPrice, ... closes productsSqlDataReader using the Close() method: productsSqlDataReader.Close(); Once you've closed your DataReader, you can execute other commands using your Connection object. int...
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Tài liệu Add and Delete Rows in a Dataset with ADO.NET pdf
... 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 ... refreshed, and the first customer in the list is displayed in the text boxes. Comments As you can see, adding and deleting a record does not take much more than editing and updating a record using ADO.NET. ... It Works When a user clicks the Add button, the text boxes are all blanked out, and the mblnAdd flag is set as True. Then, after the user adds his information and clicks the Save button, the...
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Tài liệu Saving and Loading a DataSet from XML pptx
... Team LiB ] Recipe 8.2 Saving and Loading a DataSet from XML Problem You need to save a DataSet as an XML file and create a DataSet from an XML file. Solution Use the XmlTextWriter and XmlTextReader ... tables. The XML schema and data for the DataSet is written both to a file and to a text box on the form. Read Button.Click Creates a DataSet and reads in schema and data from a file containing ... 8.1 and the MSDN Library. The WriteXml( ) and ReadXml( ) methods of the DataSet are used to write and read the XML for the DataSet. The WriteXml( ) method takes an optional argument that specifies...
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Tài liệu Filling a DataSet Using an XML Template Query ppt
... Create the DataSet. DataSet ds = new DataSet( ); // Create the SQL XML DataAdapter. SqlXmlAdapter da = new SqlXmlAdapter(cmd); // Fill the DataSet. try { da.Fill(ds); } catch(Exception ... creates a SqlXmlCommand template query and its single SqlXmlParameter object. The parameter is set to the user-specified value. A SqlXmlDataAdapter object is created and executed to fill a new ... command using the Name and Value properties ClearParameters( ) Clears SqlXmlParameter objects for a command Table 8-7 describes the properties of the SqlXmlCommand class. Table 8-7. SqlXmlCommand...
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- using xsd schema files to load and save a dataset structure
- using a datareader object in visual studio net
- using a sqlconnection object to connect to a sql server database phần 1
- using a sqlconnection object to connect to a sql server database phần 2
- reading rows from a sqldatareader object
- creating and using a datarelation object
- creating and using a dataviewmanager object
- creating and using a dataview object
- creating a dataset object using visual studio net
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