Creating Database-Backed Library Web Pages: Using Open by Stephen R. Westman

By Stephen R. Westman

Database-backed websites supply many benefits for libraries: clients get actual and up to date info in genuine time, and placement upkeep and knowledge publishing are a lot more straightforward. As beautiful an idea as database-backed pages are, the “how-tos” of making them stay a secret to many librarians.This hands-on source presents the instruments to enhance clients’ effects through supplying present info, make web site upkeep and knowledge publishing a lot more straightforward, or even upload new usefulness to present info. Following those transparent, step by step causes, readers will locate confirmed strategies for solutions to questions like: * What are database-backed web content? * How a lot technical knowledge is required to do that? * while, and for what varieties of details, are database-backed web content acceptable? * What are Open resource instruments? * Who can use Open resource software program? * Why is it applicable for libraries?The ebook includes:# pattern program code and databases# A programming surroundings, together with a functionality library to facilitate the programming of often-needed initiatives# hyperlinks to info on developing your individual database-backedwebsite, together with particular directions on find out how to manage the book's programming surroundings# instance varieties, files, and programming criteria for designing your personal siteThe e-book specializes in MySQL but additionally deals details on PostgreSQL, together with complete help for it within the functionality library.This authoritative, money-saving advisor takes readers via a whole venture from idea to implementation. It serves either newbie and professional librarians concerned with designing and keeping web content, in addition to IT managers and directors looking professional information on undefined, software program, and programming and documentation systems. choked with professional recommendation and hyperlinks to genuine instruments, this robust, hands-on reference will streamline site owners’ effects and buyers’ searches.

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For example, if you wanted to see all subjects in alphabetical order, you would use the following query: SELECT subject FROM subjects ORDER BY subject You can also order by multiple fields. For example, to print out an alphabetical list of patrons, you could use this one: SELECT * FROM patrons ORDER BY last_name, first_name The result of this search would be the entire contents of the patrons table, ordered by last_name and, within last_name, by first_name. MULTIPLE TABLES Although the previous queries are useful in querying sin- gle tables, the full power of relational databases comes in the user’s being able to retrieve information from anywhere in the system.

16 D ATA B A S E B A S I C S 31 However, it is possible to force case sensitivity by using the BINARY operator on one of the elements in the search. For example, the following two (equivalent) searches will retrieve records where France (but not france) is in the title field: SELECT * FROM books WHERE BINARY title LIKE '%France%' SELECT * FROM books WHERE title LIKE BINARY '%France%' Just as command line searching in OPACs, SQL does enable you to provide multiple conditions with its Boolean operators AND and OR.

Therefore, rather than spending time on dealing with these vagaries, I have standardized on lowercase for all database, table, and field names, something that is fairly normal in relational databases. Figure 3-1 Before going on, let me take a minute and explain the potentially very confusing concept of NULL versus NOT NULL. ” Although it is perfectly possible—and for the most part legal in MySQL—to define a field as NOT NULL and then define the default as an empty string, the two are not the same and can cause you problems in the most unexpected ways.

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