TRIGGERS in C#.net

Deploy Data Matrix in C#.net TRIGGERS

Let s start with the SELECT list: select orders.orderid, orders.customerid, employees.lastname Since you re selecting columns from two tables, you need to identify which table a column comes from, which you do by prefixing the table name and a dot (.) to the column name. This is known as disambiguation, or removing ambiguity so the database manager knows which column to use. Though this has to be done only for columns that appear in both tables, the best practice is to qualify all columns with their table names. The following FROM clause specifies both the tables you re joining and the kind of join you re using: from orders inner join employees on orders.employeeid = employees.employeeid

> LabelInfoWithPropertySetting(Text="Hello World");; val it : LabelInfo = {Font = [Font: Name=Microsoft Sans Serif, Size=12]; Text = "Hello World"} You use this technique in 11 when you learn how to define a Windows Forms control with configurable properties. The Defining Object Types with Mutable State section later in this chapter covers mutable objects in more detail.

Java ME introduced a new framework to the Java language. The Generic Connection Framework, or GCF, provides a generic mechanism for accessing many different kinds of resources that exist outside your app. The GCF will be used in all but the most trivial applications, whether you are building a MIDlet or a BlackBerry CLDC app.

Page Order: This allows you to specify the listing order of your pages. The default theme will list all your pages on your blog. By default, it lists them in alphabetical order, preserving the hierarchy if there is one. If this is not suitable, you may specify the sort order of pages on the same level. When you have finished setting up your page, click the Create New Page button, and your page will be created. Switch over to view your blog to see the result. In Figure 15-22, I have added some more pages to illustrate the listing in the sidebar. Compare the display of the page with the display of postings in Figure 15-13.

The first function is when we wish to test a condition. WHEN that condition is true THEN we can do further processing, ELSE if it is false, then we can do something else. What happens in the WHEN section and the THEN section can range from another CASE statement to providing a value that sets a column or a variable.

The workflow has four instances of the AddToCollection activity. Each one adds an object to the collection. This is a template class and you must declare the type of object that is stored in the collection. In this case, the ListItem data type is specified. The AddToCollection activity has two properties: Collection specifies the variable that holds the collection, and Item is the object that is to be added. For the Item property, it creates a new instance of the ListItem class using the constructor that populates all the class members.

Notice the property definitions marked in bold. The three public properties Address, Type, and Emails are of type Address, EmployeeType, and string array, respectively. The code in the Click event handler of the Serialize button now changes as shown in Listing 8-9. Listing 8-9. Serializing Complex Types private void button1_Click(object sender, EventArgs e) { Employee emp = new Employee(); emp.EmployeeID = int.Parse(textBox1.Text); emp.FirstName = textBox2.Text; emp.LastName = textBox3.Text; emp.HomePhone = textBox4.Text; emp.Notes = textBox5.Text; emp.Type = (comboBox1.SelectedIndex == 0 EmployeeType.Permanent : EmployeeType.Contract); emp.Address.Street = textBox6.Text; emp.Address.City = textBox7.Text; emp.Address.State = textBox8.Text; emp.Address.Country = textBox9.Text; emp.Address.PostalCode = textBox10.Text; emp.Emails = textBox11.Text.Split(','); FileStream stream = new FileStream(Application.StartupPath + @"\employee.xml", FileMode.Create); XmlSerializer serializer = new XmlSerializer(typeof(Employee)); serializer.Serialize(stream, emp); stream.Close(); if (checkBox1.Checked) { Process.Start(Application.StartupPath + @"\employee.xml"); } }

Often, in the course of a mass deployment system, you ll want to customize OS X system or application preference files on a machine-specific basis. With the advent of OS X, the standardized format for many of these files is that of the property list (plist). These files contain serialized data organized in a key/value format capable of storing common data types: strings, numbers, dates, booleans, arrays, dictionaries, and raw binary data. Using these data elements, applications can store complex data structures for a wide variety of uses. The plist format isn t the most efficient for large data sets, though, so the information stored rarely exceeds a few hundred kilobytes. Still, that s ideal for applicationpreference storage. Prior to OS X 10.2, plist files could exist in XML format only. But while XML files are convenient for human perusal and hand editing, they re not the most efficient for runtime processing. So in an effort to optimize performance, Apple introduced the plist binary format for more efficient access by running processes. You can edit plist files in numerous ways. With those in XML, you can use the text editor of your choice. But generally, when a running process accesses the file, the OS convert the format into the more efficient binary, after which your favorite text editor is all but useless. Thus, before opening the file, you may want to verify the format using the file command-line tool: