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Using your own custom reporting mechanisms for complex structures, such as arrays and hashes, can be a practical way of outputting information in a formatted fashion However, if you are reporting simpler structures, or you want to produce reports that would be reported and formatted using the printf function, then you can use a specially designed feature of Perl to format the output for you The Perl mechanism actually inherits much of its functionality from a variety of sources, including FORTRAN and BASIC The Perl mechanism (otherwise called Formats) is a complete reporting environment that is very similar to many systems in commercial database-oriented packages, such as those used for accounting and contacts systems The Perl reporting mechanism keeps track of all the different parameters that affect a report, including the number of lines on the page, the page number you are currently printing to, and even the production of formatted page headers for each generated page The format for a format definition is as follows:

259 260 260 261 262 263 266 267 268 269 270 273 275 275 276 281 282 283 283 286 288 289 290 291 293 294 295 298 298 300 303 303 303 Exam Objectives Categorize the Main Database Objects Object Types Naming Schema Objects Object Namespaces List the Data Types That Are Available for Columns Create a Simple Table Creating Tables with Column Specifications Creating Tables from Subqueries Altering Table Definitions after Creation Dropping and Truncating Tables Create and Use Temporary Tables Indexes Why Indexes Are Needed Types of Index Creating and Using Indexes Modifying and Dropping Indexes Constraints The Types of Constraint Defining Constraints Constraint State Constraint Checking Views Why Use Views at All Simple and Complex Views CREATE VIEW, ALTER VIEW, and DROP VIEW Synonyms Sequences Creating Sequences Using Sequences Two-Minute Drill Categorize the Main Database Objects List the Data Types That Are Available for Columns

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A format is treated like another core structure within Perl, and so it can be defined anywhere in your script, just like a subroutine or package declaration Just like other structures, a format also has its own name space, so a format called Foo can coexist with a function called Foo The tradition is for format names to be uppercase and usually have the same name as the filehandle to which they are output The default format NAME is STDOUT, for example The FORMLIST portion is just like a subroutine definition, but without the brace enclosure, and is made up of one of three types of information: a comment, a picture,

or an argument line A comment is signified by a # character in the first column and is treated just like any other comment within Perl The picture line is a text string that specifies how the information will be output It is printed verbatim, apart from the field definitions that are used to print out the information you want to output Special characters, as summarized in Table 16-2, specify the individual field formats for the pictures Using the information in Table 16-2, you can create definitions accordingly For example,

Create a Simple Table Create and Use Temporary Tables Constraints Indexes Views Synonyms Sequences Self Test Self Test Answers 304 304 304 304 304 305 305 305 311

prints out each line with an eight-character, left-justified product ID; a centered type; a cost, printed as a formatted floating point value; and a right-justified stock level The repetition of the individual format characters specifies the field width; so in the example of the cost field, it is printed as four digits, a decimal point, and two more digits

8

Defines a field picture Specifies left justification; the number of repetitions specifies the field width Specifies right justification; the number of repetitions specifies the field width Specifies centered justification; the number of repetitions specifies the field width Specifies numbered justification; usually used for floating point fields See the example in the text Defines a split field; information will be printed at the specified width, but will span multiple lines Indicates that blank lines in a format should be ignored This means that if you specify multiple ^ fields but the information does not fill all the lines, then blanks won t be printed instead

Microsoft maintains public newsgroups for .NET programming. The C# newsgroup is named microsoft.public.dotnet.csharp.general, and it lives on the msnews.microsoft.com news server. Numerous Web sites are devoted to .NET information. You can find links to these resources at the Apress Web site.

Table 16-2

315 316 316 320 323 325 326 328 330 330 331 335 340 340 341 346 346 347 347 350 351 352 354 354 355 356 358 359 359 360 360 360 360 360

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