Tài liệu Chapter 23 Quick Reference pptx

Chapter 23 Quick Reference
To Do this
Create a connection to a
database graphically in
Visual Studio 2005.
Use the Data Source Configuration Wizard. The wizard
prompts you for the details of the connection to create and the
database objects to use.
Browse data in Visual
Studio 2005.
In the Data menu, click Preview Data. The Preview Data
dialog box allows you to select a DataSet and DataTable
object. Click the Preview button to view the data.
Change the way in which
a DataTable will be
presented on a form.
In the Data Sources window (click Show Data Sources on the
Data menu if this window is not displayed) click the
DataTable. Select the style (DataGridView, Details, or None)
from the drop-down menu that appears.
Modify the way in which
fields in a data source will
be displayed on a form.
In the Data Sources window, expand the DataTable
containing the fields to be modified. Click the field, and select
the presentation style from the drop-down menu that appears.
Add a DataTable to a
form.
Click and drag a DataTable object from the Data Sources

window onto the form. Either a collection of fields or a
DataGridView is added to the form. Visual Studio 2005 also
generates a DataSet, a BindingSource, a TableAdapter, and a
BindingNavigator object for connecting the form fields or
DataGridView to the database and moving through the data.
Programmatically connect
to a database.
Create an SqlConnection object, set its ConnectionString
property with details specifying the database to use, and call
the Open method.
Create and execute a
database query in code.
Create an SqlCommand object. Set its Connection property to
a valid SqlConnection object. Set its CommandText property
to a valid SQL SELECT statement. Call the ExecuteReader
method to run the query and create an SqlDataReader object.
Fetch data by using a
SqlData-Reader object.
Ensure the data is not null by using the IsDBNull method. If
the data is not null, use the appropriate GetXXX method
(such as GetString or GetInt32) to retrieve the data.