Javaâ¢ Application Development on Linux - Dator

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322Chapter 14Storing the Data14.8PERSISTENCE IS NOT THE WHOLE STORYIn this chapter and throughout this book we take a practical view that adatabase is there to store an application’s data. That’s far from the intent. Arelational database is designed to create collections of data and to perform logicalqueries within and between those collections. The relational model is muchmore than application storage. It facilitates all kinds of data analysis. This isoften ignored in enterprises these days.Don’t forget that designing database tables should take into accountconcerns beyond mere application storage.14.9SETTING UP POSTGRESQL FOR BUDGETPROLet’s turn our attention to installing and starting PostgreSQL to support theBudgetPro application.14.9.1 Installing PostgreSQLThe simplest way to install PostgreSQL is to use precompiled binary packages.RedHat and Fedora have RPM packages for installing the database and clientsoftware (although neither distributes the client libraries for Java due to licensingissues with Java itself). The PostgreSQL project produces RPM packagesof their own, including the Java JDBC class library. Those might be your easiestcourse. Debian packages for PostgreSQL exist, but again, they do not providethe JDBC library.For our purposes, we are going to assume that you have downloaded andinstalled the following RPM packages 9 from the PostgreSQL Download page: 10• postgresql-server• postgresql-devel• postgresql-jdbc• postgresql-docs (optional)9. If you are a user of Debian or another Debian-based Linux distribution, you should be awarethat there is a Debian package called alien, which can install and manage RPM packages ona Debian system.10. http://www.postgresql.org/mirrors-ftp.html
14.9 Setting Up PostgreSQL for BudgetPro32314.9.2 Creating a postgres UserMore than likely, installing a PostgreSQL package will create a new Linux usercalled postgres on your system. This is not a login account; it will be used bythe database server process daemon 11 (called “postmaster,” lest you think thatit might be an e-mail server or something). Furthermore, only the postgresuser is able to create additional database users or any databases.Obviously, we won’t want it to be like this forever. It has the same problemas the root user on the OS itself: There’s one magic user with all thepower. You’ll need to create additional users and you’ll want to limit what theycan do. How to do it?First off, you can’t log in as postgres, so you will have to become rootand then su to the postgres user:[mschwarz@cassidy mschwarz]$ su -Password:[root@cassidy root]# su - postgres-bash-2.05b$Note that postgres didn’t have any profile or rc script to set up promptsor anything.All PostgreSQL databases have owning users, in much the same way thatall Linux files have owning users. But PostgreSQL users are not necessarily thesame as Linux users. 12 The only PostgreSQL user that exists “out of the box”is postgres. You must use the createuser command-line utility (or theequivalent SQL) to create a user. Here’s an example:11. Historically, daemon processes on UNIX systems used to be run as root. But a programerror in a daemon would allow a malicious user to execute code as the owner of the process. Ifthat owner is root, one programming mistake in a server process could give an attacker totalcontrol of the system. Beware of any daemon process that runs as root. Nowadays, these runas either a totally nonpriviledged user such as nobody, or, if they really need to write files orsome such thing, as a catch-all user like daemon. The database is an important process and itneeds its own security, so it runs as its own user, postgres.12. For most PostgreSQL command-line utilities, if no PostgreSQL username is specified, thecurrent Linux username will be used. This is often a convenient choice, but you might havecompelling reasons not to do this.
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Java Application
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Java Application
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To my mother, for her love of words
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viiiContents1.41.51.6Chapter 22.12.
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xContents5.65.75.85.95.105.115.125.
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xiiContentsChapter 99.19.29.39.49.5
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xivContentsChapter 1313.113.213.313
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xviContentsChapter 1717.117.217.317
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xviiiContents20.620.720.820.920.102
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PrefaceJAVA AND LINUXWhy another bo
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PrefacexxiiiFREE SOFTWARE AND JAVAG
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Prefacexxvand Tyrrell Albaugh, who
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xxviiiIntroductionIf you are an exp
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xxxIntroductionThe Linux Newbie Pat
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Part IGetting Started
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4Chapter 1An Embarrassment of Riche
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10Chapter 1An Embarrassment of Rich
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Chapter 2An Embarrassment of Riches
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2.2 Eye to Eye with vi35of their co
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2.2 Eye to Eye with vi37• L (“l
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2.2 Eye to Eye with vi39In both cas
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2.2 Eye to Eye with vi41• :7,.w!
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2.2 Eye to Eye with vi431,$s/Tryout
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2.3 Editors Galore45affected by thi
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2.3 Editors Galore47has a huge lear
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2.6 Resources49• fte is an editor
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52Chapter 3An Experienced Programme
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100Chapter 4Where Am I? Execution C
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116Chapter 5The Sun Microsystems Ja
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168Chapter 6The IBM Developer Kit f
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Chapter 7The GNU Compiler for Java(
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7.4 Compiling Our Simple Ap
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7.4 Compiling Our Simple Ap
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7.5 Options and Switches1857.5OPTIO
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7.9 What You Still Don’t Know187o
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Chapter 8Know What You Have:CVSSour
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8.2 Source Control: Whys and Hows19
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8.3 A GUI: jCVS211and the differenc
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8.4 Review213Figure 8.7 jCVS checko
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Chapter 9Ant:An IntroductionAnt 1 i
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9.3 Obtaining and Installing Ant217
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9.3 Obtaining and Installing Ant219
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9.4 A Sample Ant Buildfile221standa
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9.4 A Sample Ant Buildfile2239.4.2.
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9.4 A Sample Ant Buildfile225$ antB
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9.4 A Sample Ant Buildfile227debugI
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9.4 A Sample Ant Buildfile229Exampl
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9.4 A Sample Ant Buildfile231Runnin
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9.7 Resources233• O’Reilly has
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236Chapter 10Integrated Dev
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Chapter 11Balancing Acts:An Imagina
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11.3 How to Develop Software265soft
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11.4 What Makes a Good Requirement2
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11.6 Requirements for the Budget <s
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Page 351 and 352: 14.7 Beyond the Basics319files, and
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Page 365 and 366: 15.4 Querying Data333// queryString
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372Chapter 16Getting in the Swing o
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378Chapter 17Other Ways: Alternativ
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Part IVDevelopingWeb Interfaces
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404Chapter 18Servlets: Java Pressed
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19.5 Review439into JSP files. The m
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444Chapter 20Open Source Web <stron
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494Chapter 22Building an EJBclasses
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496Chapter 22Building an EJBwhich,
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498Chapter 22Building an EJBExample
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500Chapter 22Building an EJBExample
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502Chapter 22Building an EJBIf you
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Chapter 23Deploying EJBsIn this cha
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23.2 Lend Me Your EAR: Enterprise P
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23.3 Deploying the EAR515automatic
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23.8 Resources519Ant and CVS and ho
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522Chapter 24Parting ShotsThe three
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524Chapter 24Parting ShotsPrentice
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526Appendix AASCII ChartInt Oct Hex
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528Appendix BA Java Swing GUI for B
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Appendix CGNUGeneral Public License
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C.2 Terms and Conditions for Copyin
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C.2 Terms and Conditions for Copyin
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C.3 NO WARRANTY545of this License,
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C.5 How to Apply These Terms to You
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550Index$ (dollar)in format fields,
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552Indexbreak statement, 67, 74-75b
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554IndexCVS_RSH environment variabl
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556IndexFfail(), 307false constant,
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558IndexIBM, 236, 377, 518Common Pu
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560IndexJNDI (Java Naming and Direc
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562IndexNetBeans (continued)running
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564IndexScrollBar class, 385search
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566IndexTable class, 386, 394-395ta
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