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UNIQUE is yet another kind of constraint that can be applied to table columns. This constraint is similar to the PRIMARY KEY constraint in that it doesn t allow duplicate data in a column. Still, there are differences. Although there is only one PRIMARY KEY constraint per table, you are allowed to have as many UNIQUE constraints as you like. Columns that have the UNIQUE constraint are useful when you already have a primary key but still have columns (or groups of columns) for which you want to have unique values. You can set name to be unique in the department table if you want to forbid repeating values. We won t use the UNIQUE constraint in this book, but we mention it here for completeness. We decided to allow identical department names because only site administrators will have the privilege to modify or change department data. The facts that you need to remember about UNIQUE constraints are The UNIQUE constraint forbids having identical values on the field. You can have more that one UNIQUE field in a data table. A UNIQUE field is allowed to accept NULL values, in which case, it will accept any number of them. Indexes are automatically created on UNIQUE and PRIMARY KEY columns.

To provide the values required by the HTML template, a Tapestry page specification file serves as a bridge or binding between the HTML template and any underlying Java code or HiveMind services Listing 7-13 shows the Homepage file showing how to inject a HiveMind service using the inject element The property attribute is the name under which the property will be exposed, and the object attribute is the identifier used to locate the value In the template we re also defining the property conference, which serves as the placeholder for the individual element of the collection being iterated over in Listing 7-12..

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Each column in a table has a particular data type. By looking at the previously shown Figure 3-8 with the department table, department_id has a numeric data type, whereas name and description contain text. It s important to consider the many data types that PostgreSQL Server supports so that you ll be able to make correct decisions about how to create your tables. Table 3-1 isn t an exhaustive list of PostgreSQL data types, but it focuses on the main types you might come across in your project. Refer to the PostgreSQL documentation for a more detailed list at http://www.postgresql.org/docs/current/interactive/datatype.html.

C++, like C before it, relies on you, the developer, to keep track of when your application allocates memory and when it should release it for reuse. In small applications this isn t difficult, but as your application grows in complexity, it gets more difficult. Errors where you allocate memory and don t free it cause memory leaks; on constrained devices such as mobile phones, that can mean the difference between running and crashing as your application runs out of memory. Worse, large programs can see more insidious problems, such as using a region of memory after you ve released it to the memory manager, which can cause crashes and other aberrant behavior in your application. To help your application track when it needs to free allocated memory, Qt provides a hierarchy of memory ownership with most of its classes. When you create an object instance, you can designate another QObject as the owner (called the parent) of the object you re about to create. In turn, when the parent is released, any objects owned by the parent are also released. For example, to create a button to be released when the allocating object is deleted, we d write:

Listing 7-13. Home Page Tapestry Page Specification < xml version="1.0" > <!DOCTYPE page-specification PUBLIC "-//Apache Software Foundation//Tapestry Specification 4.0//EN" "http://jakarta.apache.org/tapestry/dtd/Tapestry_4_0.dtd"> <page-specification> <inject property="conferenceService" object="service:app.ConferenceService"/> <property name="conference"/> <!-- Assets --> <asset name="stylesheet" path="css/techconf.css"/> <asset name="spacer" path="images/spacer.gif" /> <asset name="arrow" path="images/arrow.gif" /> </page-specification> The Java code for the Home page needs to provide the method to access the collection of conferences. To accomplish this it also needs an instance of ConferenceService (which is injected in the page specification shown in Listing 7-13). Listing 7-14 shows the code for the Home page. Listing 7-14. Home Page Page Class package com.integrallis.techconf.web.tapestry.pages; import java.util.List; import org.apache.tapestry.event.PageBeginRenderListener; import org.apache.tapestry.event.PageEvent; import org.apache.tapestry.html.BasePage; import com.integrallis.techconf.dto.ConferenceSummary; import com.integrallis.techconf.service.ConferenceService; public abstract class Home extends BasePage implements PageBeginRenderListener { public void pageBeginRender(PageEvent event) { setConferences(getConferenceService().getAllConferences()); }

For more information about any specific detail regarding PostgreSQL or PHP, including PostgreSQL Tip

QPushButton* button = new QPushButton(this);

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