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C# uses a semicolon (;) as a statement-termination character. Every statement in C# code must end with this semicolon, except when you re defining a block structure such as a method, a conditional statement, or a looping construct. By omitting this semicolon, you can easily split a statement of code over multiple physical lines. You just need to remember to put the semicolon at the end of the last line, to end the statement. The following code snippet demonstrates four equivalent ways to perform the same operation (adding three numbers together): // A code statement split over two lines. myValue = myValue1 + myValue2 + myValue3; // A code statement split over three lines. myValue = myValue1 + myValue2 + myValue3;

Listing 12-10. Create Students Table Migration (db/migrate/001_create_students.rb)

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You have probably noticed that any information you set in a member variable for an ASP .NET page is automatically abandoned when the page processing is finished and the page is sent to the client. Interestingly, you can work around this limitation using view state. The basic principle is to save all member variables to view state when the Page.PreRender event occurs and retrieve them when the Page.Load event occurs. Remember, the Load event happens every time the page is created. In the case of a postback, the Load event occurs first, followed by any other control events. The following example uses this technique with a single member variable (named Contents). The page provides a text box and two buttons. The user can choose to save a string of text and then restore it at a later time (see Figure 7-2). The Button.Click event handlers store and retrieve this text using the Contents member variable. These event handlers don t need to

save or restore this information using view state, because the PreRender and Load event handlers perform these tasks when page processing starts and finishes.

class CreateStudents < ActiveRecord::Migration def self.up create_table :students do |t| t.string :name, :limit=>45 t.string :employer, :limit=>45 t.timestamps end end def self.down drop_table :students end end

package com.proajax.chapt6; import org.apache.tapestry.IRequestCycle; import org.apache.tapestry.html.BasePage; public abstract class AddPodcast extends BasePage { /** * Invoked by forms listener:userLogin specification. */ public void addPodcast() { //do some persistence logic here } } If everything goes according to plan, you should see something like Figure 6-17 when you submit the form. Obviously this example is just scratching the surface of what you can do with Tapestry and Tacos, but it gives you an idea on where to go from here.

Figure 7-2. A page with state public partial class PreserveMembers : Page { // A member variable that will be cleared with every postback. private string contents; protected void Page_Load(Object sender, EventArgs e) { if (this.IsPostBack) { // Restore variables. contents = (string)ViewState["contents"]; } } protected void Page_PreRender(Object sender, EventArgs e) { // Persist variables. ViewState["contents"] = contents; } protected void cmdSave_Click(Object sender, EventArgs e) { // Transfer contents of text box to member variable. contents = txtValue.Text; txtValue.Text = ""; }

protected void cmdLoad_Click(Object sender, EventArgs e) { // Restore contents of member variable to text box. txtValue.Text = contents; } } The logic in the Load and PreRender event handlers allows the rest of your code to work more or less as it would in a desktop application. However, you must be careful not to store needless amounts of information when using this technique. If you store unnecessary information in view state, it will enlarge the size of the final page output and can thus slow down page transmission times. Another disadvantage with this approach is that it hides the lowlevel reality that every piece of data must be explicitly saved and restored. When you hide this reality, it s more likely that you ll forget to respect it and design for it. If you decide to use this approach to save member variables in view state, use it exclusively. In other words, refrain from saving some view state variables at the PreRender stage and others in control event handlers, because this is sure to confuse you and any other programmer who looks at your code.

Note that the limit clause sets a maximum amount of characters in each column. Listing 12-11 shows the code for your student model.

s The previous code example reacts to the Page.PreRender event, which occurs just after page proTip

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