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pl: #!/usr/bin/perl $^W=1; It is standard on Unix systems to specify the name of the interpreter to use as the first line of the file the so-called hash-bang line (because it starts with #!) A common sight in many Perl scripts is the following, which enables warnings automatically: #!/usr/bin/perl -w Windows platforms will generally understand this convention too If the file has a recognized file extension (such as pl) and is passed to Perl to execute, the options specified on the end of the line are extracted and applied even though the path itself is not applicable We don t always want or need to enable warnings everywhere, though The use warnings pragma is lexically scoped, so it only affects the file (or block) in which it appears.

#!/usr/bin/perl use warnings; use A::Module; #warnings not enabled inside loaded module This is handy when we are trying to diagnose problems in our own code and want to ignore warnings being generated by modules we are just using That doesn t mean the warnings aren t important, but it allows us to be selective We can be more selective by switching on or off different categories of warnings, which we will discover how to do in 16 Perl also provides the strict pragma This enables additional checks that our code must pass at compile time before the interpreter will execute it This is almost always a good thing to do and there are few reasons not to, except in very small scripts and one-liners In fact there are three separate strict modes: vars, refs, and subs.

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confirm that the age is valid and UsertitleAge() displays the title of the age property, making the title something that can be edited by non-technical users instead of just programmers In ColdFusion, it takes a little tap dancing to implement custom data types in a way that performs well In Java you could just create an object for each property so you d be able to call methods like Useragedisplay() and Useragefield() In ColdFusion, creating that many objects would be slow The solution is to create a CFC for handling each data type (stringcfc, datecfc, currencycfc, usPhoneNumbercfc, etc) You then instantiate each of those just once in your application (the Singleton pattern for those interested in design patterns) and then you put these data type objects into all of your business objects.

A use strict without arguments gives us all three, but we can enable or disable each mode separately if we wish use strict; #enable all strict checks use strict qw(vars refs subs); #same thing, explictly no strict qw(refs); #allow symbolic references.

The vars mode enforces the declaration of variables before or at their first use; we touch on it some more in just a moment. The refs mode disables symbolic references, while the subs mode prevents us from using subroutines without parentheses or a & prefix, where their meaning and context can be ambiguous. We tackle these two subjects in s 5 and 7, respectively.

If you want to change this setting on an existing database, then you should back up the database, drop it, change the option, restart the server, and then reload the database from the backup innodb_buffer_pool_size=: If you are using only InnoDB tables, then set this to about 70 percent of available memory If you have a mixed MyISAM/InnoDB setup, then back it up a little to give MyISAM some space innodb_log_buffer_size=4M: This size would deal with most record sizes and provide a reasonable performance If you have large text fields or blobs or have unusually large record sizes, then be prepared to take it up a bit innodb_log_file_size=256M: This is recommended and strikes a good balance between the speed of recovering a database and having good runtime performance innodb_flush_log_at_trx_commit=2: This controls how often the log file is flushed to disk.

ubroutines are autonomous blocks of code that function like miniature programs They can be executed from anywhere within a program, and because they are autonomous, calling them more than once will also reuse them There are two types of subroutine, named and anonymous Most subroutines are of the named persuasion, called by writing their names literally into the source code Anonymous subroutines do not have a name by which they can be called but are stored and accessed through a code reference Since a code reference is a scalar value, it can be passed as a parameter to other subroutines and built-in functions like sort The use of named subroutines is syntactically the same as the use of Perl s own built-in functions We can use them in a traditional function-oriented syntax (with parentheses) or treat them as named list operators.

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