illustrating the add method the data

... look at these procedures The AddProduct4() Procedure AddProduct4() adds a row to the Products table It uses the number because previous chapters featured procedures named AddProduct(), AddProduct2(), ... create the procedure in the database Listing 11.4: ADDPRODUCT4.SQL /* AddProduct4.sql creates a procedure that adds a row to the Products table using values passed as parameters to the procedure The ... SqlDataAdapter mySqlDataAdapter = new SqlDataAdapter(); mySqlDataAdapter.SelectCommand = mySelectCommand; The SELECT statement is then run when you call the mySqlDataAdapter object's Fill() method...

Ngày tải lên: 14/12/2013, 13:15

... by the database when the new row is pushed to the database by the Update() method in step When the Update() method is called, the AddProduct4() stored procedure is run to add the new row to the ... Add( ) method through the Rows property // to add the new DataRow to the DataTable Console.WriteLine("Calling myDataTable.Rows .Add( )"); myDataTable.Rows .Add( myNewDataRow); Console.WriteLine("myNewDataRow.RowState ... contains the new ProductID This ProductID is then returned at the end of the AddDataRow() method The output from AddDataRow() and its call to DisplayDataRow() are as follows: In AddDataRow()...

Ngày tải lên: 14/12/2013, 13:15

... DataTable.Rows Add Adds the DataRow object to the DataTable object DataTable BeginLoadData Turns off the schema checking that occurs when you're adding the new row to the DataTable object DataTable ... object The Session variables are then updated, with the IsAdding item set to True Lastly, the EditItemIndex of dgLookupData is then set, and the DataGrid bound to the data table using the BindTheGrid ... mdtRegion.BeginLoadData() ' Add the row to the data table via the data row drCurr = mdtRegion.NewRow mdtRegion.Rows .Add( drCurr) ' Set the Adding flag Session("MyLookupData") = mdtRegion Session("IsAdding")...

Ngày tải lên: 21/01/2014, 12:20

... to remember that data is not “just data in most applications—rather, the data in the database models the actual business Therefore, data rules must mirror all rules that drive the business itself ... requirement in another The database is, in most cases, the center of the applications it drives The data controls the applications, to a great extent, and without the data the applications would ... with the data As a general guideline, you should try to implement as many data rules as necessary in order to avoid the possibility of data quality problems The database is the holder of the data, ...

Ngày tải lên: 05/10/2013, 08:48

... modify the new row just added The following code sets the CommandText property of mySqlCommand to an UPDATE statement that modifies the CompanyName column of the new row, and then calls the ExecuteNonQuery() ... number of rows affected by the command In this example, the value returned is the number of rows added to the Customers table, which is since one row was added by the INSERT statement Let's take ... you execute the INSERT statement using the ExecuteNonQuery() method: int numberOfRows = mySqlCommand.ExecuteNonQuery(); The ExecuteNonQuery() method returns an int value that indicates the number...

Ngày tải lên: 24/10/2013, 08:15

... processed the required data The number of choices concerning which data to record is again quite daunting, but the included templates help narrow down the monitoring selections Using the templates ... on One of the most powerful aspects of Profiler is its ability to import performance data from a counter log Once imported, you can click on the spike in the performance data The two data are ... performance data returned from a simple query This statement returns the current values of the performance counters for SQL 740 rows of dynamic information gathered from the exact time the query...

Ngày tải lên: 10/12/2013, 14:15

Ngày tải lên: 10/12/2013, 19:15

... committed in the DataRow However, if you start the change to the DataRow using the BeginEdit() method, then the change is committed only when you call the EndEdit() method of that DataRow You ... If you then call the AddDataRow() method shown earlier to attempt to add a row to the Customers table, the RowUpdating event will fire and call the RowUpdatingEventHandler() method This method ... with the value that is changing ProposedValue object Gets or sets the new value for the DataColumn Row DataRow Gets the DataRow that contains the DataColumn with the value that is changing The...

Ngày tải lên: 14/12/2013, 13:15

... specifies the name of the database to use in place of the current database The name of the database must be valid or an ArgumentException will be raised If the connection is not open when the method ... if the database cannot be changed for any reason The Database property of the Connection object is updated dynamically and returns the current database for an open connection or the name of a database ... result.Append("Database: " + conn.Database + Environment.NewLine); // Change the database to pubs conn.ChangeDatabase("pubs"); result.Append("Database: " + conn.Database + Environment.NewLine); // Close the...

Ngày tải lên: 14/12/2013, 18:16

... view of the Categories table to the grid dataGrid.DataSource = ds.Tables["tblmapCategories"].DefaultView; Discussion When the Fill( ) method of the DataAdapter is used to fill a DataSet, the column ... in the DataSet for the table associated with the containing table mapping object The Fill( ) method of the DataAdapter always uses mapping information (if present) to retrieve data from a data ... submitting DataSet changes back to the data source In the solution, the Categories table retrieved by the query is mapped to a table in the DataSet called tblmapCategories with the following code: DataTableMapping...

Ngày tải lên: 14/12/2013, 18:16

... opened, and the ExecuteReader method is called After the list has been cleared, the DataReader is iterated through, and the ListBox control is loaded Comments The DataReader object is one of the most ... of the txtCustLimit text box and adding it to a literal Then, within a Try-Catch-End-Try block, a new instance of an OleDbCommand object called ocmdCust is created The routine then follows the ... object in the single statement This is new to NET and is extremely useful How It Works When the user clicks the btnLoadList button, the Command object is assigned the necessary properties, the connection...

Ngày tải lên: 14/12/2013, 20:16

... on the right, enter the Name of the form as MyDataForm.cs, and click Open (see Figure 6.18) You'll then see the welcome page for the Data Form Wizard Figure 6.18: Adding a data form using the Data ... Choosing the data connection Click the Next button to continue You now log in to the database by specifying the password for the database user You used the sa user when creating the database ... creating a new DataSet Enter myDataSet as the name for your DataSet, as shown in Figure 6.19 Figure 6.19: Entering the name of the new DataSet Click the Next button to go to the next step You...

Ngày tải lên: 24/12/2013, 01:17

... set the data binding for a control, you select the control in the form designer and expand the DataBindings properties in the Properties window You'll see these properties in the Data area of the ... column in a DataSet object, the value for that column is displayed in the control through the Text property in the DataBindings group The Text property in the DataBindings group sets the text displayed ... that the top part of the form shows the details for the row from the Customers table where the CustomerID is ALFKI; the bottom part of the form contains a DataGrid control that displays the rows...

Ngày tải lên: 24/12/2013, 01:17

Ngày tải lên: 24/12/2013, 06:17

Ngày tải lên: 24/12/2013, 06:17

... it has been added to a DataRow The default is false DataTable Gets the DataTable to which the DataColumn object belongs bool Gets or sets a bool value that indicates whether the DataColumn values ... Table 11.6: DataColumn PROPERTIES TYPE DESCRIPTION int Gets the numeric position of the DataColumn object (0 is the first object) bool Gets or sets a bool value that indicates whether the DataColumn ... indicates whether the DataColumn values in each DataRow object must be unique The default is false You'll see the use of some of these properties, methods, and events later in this chapter ...

Ngày tải lên: 21/01/2014, 07:20

... control whether the new table is created The second DDL command uses the CREATE TABLE statement to create the table in the database The code iterates over the collection of the columns in the DataTable ... retrieve the name and the maximum length of the column and whether the column is an identity column or allows null values A method is called to map the NET data types of the DataTable to SQL Server data ... tables in a DataSet that you want to create in a database, you can iterate through the collection of DataRelation objects for the DataSet and use the ALTER TABLE statement with the ADD CONSTRAINT...

Ngày tải lên: 21/01/2014, 11:20

... to the current column name chosen in cboSortColumns If the two are the same, then the column name is assigned to the Sort property with the DESC keyword added on If not, then the name of the ... Works When the user clicks on a letter, the data view is created, and the data grid reflects the new data When a field is selected from the ComboBox control, the Sort property of the data view ... throughout the form Private modaCust As OleDb.OleDbDataAdapter Private mdtCust As DataTable = New DataTable() Private mdvCust As DataView = New DataView() Add the following code to the Load event of the...

Ngày tải lên: 21/01/2014, 12:20

... run the Visual Basic NET-Chapter solution From the main page, click on the hyperlink with the caption How-To 5.8: Hyperlink From a Row in the Data Grid to a Detail Page You then see all the products ... that you can name it the same in step Add the code in Listing 5.30 to the Load event of the page Listing 5.30 wfrmHowTo5_8a.aspx.vb: Filling and Binding the Products to the DataGrid Object Private ... 5.31 to the Load event of the page In the SQL select statement created in this listing, the Request.Item is used to grab the productID that was passed from the first form The dtProdIndiv data table...

Ngày tải lên: 21/01/2014, 12:20

... in writing the new values to the data row, ' end the editing block, and then write the changes to the ' database If you have a problem writing to the DB, then ' reject the changes to the row and ... record, the internal flag lets the class know that the data row already exists in the dsCustomer dataset, so the WriteChangesToDB method is called to update that row in the Customers table The behavior ... of the Delete method also changes based on the value of the internal newrecord flag If the object instance is a new record, you don't need to delete the row from the database; therefore, the...

Ngày tải lên: 21/01/2014, 12:20