If you used other Oracle client software, such as Instant Client for Oracle Database Enterprise Edition, you must supply the service name. Note that the default service is a new feature for Oracle Database XE. Service_name, if not specified, the EZ Connect Adapter for XE client will connect to the default service on the host, preconfigured as XE in the listener.ora file on the XE server. Port, if not specified, uses the default value of 1521, which is the server port number from which the client connects to the database. Host is the DNS name of the server machine to which the XE client will make the connection, such as hr-server in the following example of valid connections.
#Vb net 2010 database connection password#
Psswd is the password in this book, we use hr password for the HR schema. Id is the user id we will use hr to access the HR schema.
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Save changes.ĭescription of the illustration connect25.gifĮxample 3-3 Easy Connect Naming Method Syntax for Data Source user id= id password= psswd data source= host: port/ service_name Save the changes using the Ctrl+S keyboard shortcut.Ĭlick the lightning icon ( Events) at the top of the Properties window.ĭescription of the illustration connect24.gifĮnsure that the Click event is called connect_Click. Under Design, change the (Name) property to connect.ĭescription of the illustration connect23.gif In the Properties window, change the Text property to Connect.ĭescription of the illustration connect22.gif Right-click button1, and select Properties. In the Toolbox, under Window Forms, select Button and drag it onto Form1.ĭescription of the illustration connect21.gif This will hide the password when it is entered.ĭescription of the illustration connect20.gifįrom the View menu, select Toolbox. Repeat Steps 10 through 12 twice, changing textBox2 into password and textBox2 into dataSource.įor the password text box, under Behavior category, change the value of PasswordChar property to *. In Properties, under Design, change the value of (Name) to userID.ĭescription of the illustration connect19.gif In Properties, under Appearance, remove the text in the Text property.ĭescription of the illustration connect18.gif Right-click textBox1, and select Properties.ĭescription of the illustration connect17.gif Repeat Step 8 twice, adding two more text boxes ( textBox2 and textBox3).
#Vb net 2010 database connection windows#
From the Toolbox, under Windows Forms, select a Text Box and drag it onto Form1.ĭescription of the illustration connect16.gifĪ new text box, textBox1, appears on the form. Repeat Steps 5 and 6 for the other two labels, changing the text to Password and Data Source, respectively.ĭescription of the illustration connect15.gifįrom the View menu, select Toolbox. Right-click label1, and select Properties.ĭescription of the illustration connect13.gifĬhange the Text property from label1 to User ID.ĭescription of the illustration connect14.gif Repeat Step 3 twice, adding two more labels to the form ( label2 and label3).ĭescription of the illustration connect12.gif You may also wish to close the Solution Explorer at this time.ĭescription of the illustration connect09.gifĭescription of the illustration Connect10.gifįrom the Toolbox, under Windows Forms, select a Label and drag it onto Form1.ĭescription of the illustration connect11.gifĪ new label, label1, appears on the form.
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Alternatively, use the Shift+F7 keyboard shortcut. With Form1 active, change to design view: from the View menu, select Designer. DataContext takes a connection string.ĭataContext db = new Get a typed table to run queries.Ĭonsole.WriteLine("id = ", cust.CustomerID,ĭim db As New Northwind(".\Northwnd.mdf")Ĭonsole.WriteLine("id=" & cust.To create a connection interface, you must add the necessary data entry elements to the design form. In the following example, the DataContext is used to connect to the Northwind sample database and to retrieve rows of customers whose city is London. For more information, see Security in LINQ to SQL. Maintaining a secure connection is of the highest importance.