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For the login and logout functionality we need to handle two states with their corresponding changes to the user interface. When there is no user logged in, the form with the fields for the username and password need to be shown, as well as the Register button. Upon a successful login, the login form and Register button should be hidden, and instead a user greeting and the Logout button should be shown. To handle the conditional HTML sections, we define two components. The ifLoggedIn component is a Tapestry If component which will render the content of its body if the value of the condition attribute evaluates to true (for a non-boolean object value true equates to not null). The complement of the ifLoggedIn component is the elseNotLoggedIn component which is a Tapestry Else component. The Else component renders the contents of its body if the previous If component condition evaluates to false. Listing 7-23 shows the login and logout functionality. Listing 7-23. Login and Logout Functionality in Component Specification <component-specification class="com.integrallis.techconf.web.tapestry.pages.ConferenceBorder" allow-body="yes" allow-informal-parameters="no"> ... <!-- =================================================================== --> <!-- Login Handling --> <!-- =================================================================== --> <property name="login"/> <property name="password"/> <component id="ifLoggedIn" type="If"> <binding name="condition" value="ognl:userInformation.userSummary"/> </component> <component id="elseNotLoggedIn" type="Else"/> <component id="displayLoggedInLinks" type="If"> <binding name="condition" value="ognl:userInformation.userSummary"/> </component> <component id="login" type="TextField"> <binding name="value" value="ognl:login"/> <binding name="displayName" value="literal:Email Login"/> </component> <component id="loginLabel" type="FieldLabel"> <binding name="field" value="component:login"/> </component>

Now that you have a table filled with data, let s do something useful with it! The ultimate goal with this table is to get the list of department names from a PHP page and populate the Smarty template with that list. To get data from a database, you first need to know how to communicate with the database. Relational databases understand dialects and variants of SQL. The usual way of communicating with PostgreSQL is to write an SQL command, send it to the PostgreSQL server, and get the results back. In practice, as you ll see later, we prefer to centralize the data access code using PostgreSQL functions, but before you can learn about them, you need to know the basics of SQL.

The Structured Query Language (SQL)

<qresource lang="en"> <file alias="images/flag.png">images/flag_en.png</file> </qresource> <qresource lang="fi"> <file alias="images/flag.png">images/flag_fi.png</file </qresource>

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<component id="passwd" type="TextField"> <binding name="value" value="ognl:password"/> <binding name="displayName" value="literal:Password"/> <binding name="hidden" value="true"/> </component> <component id="passwdLabel" type="FieldLabel"> <binding name="field" value="component:passwd"/> </component> <component id="displayName" type="Insert"> <binding name="value" value="ognl:userInformation.userSummary.displayName"/> </component> ... </component-specification> The rest of the components define the field and corresponding labels for the login form. Listing 7-24 shows the usage of the login and logout functionality components in the HTML template of the ConferenceBorder component. Listing 7-24. Login and Logout Markup in the HTML Template <!-- =================================================================== --> <!-- User Logged In --> <!-- =================================================================== --> <span jwcid="ifLoggedIn"> Welcome back!<br/> <!-- Show Greeting --> <span jwcid="displayName" class="mediumText">Doe, John</span> <!-- Logout Form --> <form jwcid="@Form" listener="ognl:listeners.logout"> <table width="100%" border="0" summary="logout"> <tr><td> <img jwcid="@ImageSubmit" image="asset:btn_logout" alt="Logout" src="../images/btn-logout.gif"/> </td></tr> </table> </form> </span>

SQL is the language used to communicate with modern Relational Database Management Systems (RDBMS). However, we haven t seen a database system yet that supports exactly the SQL 99 and SQL 2003 standards. This means that in many cases, the SQL code that works with one database will not work with the other. Currently, PostgreSQL supports most of SQL 92 and SQL 99. The most commonly used SQL commands are SELECT, INSERT, UPDATE, and DELETE. These commands allow you to perform the most basic operations on the database. The basic syntax of these commands is very simple, as you ll see in the following pages. However, keep in mind that SQL is a very flexible and powerful language that can be used to create much more complicated and powerful queries than what you see here. You ll learn more while building the web site, but for now let s take a quick look at the basic syntax. For more details about any of these commands, you can always refer to the official documentation at http://www.postgresql.org/docs/current/interactive/sql-select.html http://www.postgresql.org/docs/current/interactive/sql-insert.html http://www.postgresql.org/docs/current/interactive/sql-update.html http://www.postgresql.org/docs/current/interactive/sql-delete.html

The SELECT statement is used to query the database and retrieve selected data that match the criteria you specify. Its basic structure is

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