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First released in November 2005, Transfer is a ColdFusion object-relational mapping (ORM) framework that is still in use today In fact, Mark Mandel, the creator of Transfer, is constantly updating the ORM, which is now on version 11 Sean Corfield has called Transfer a very low overhead ORM, in terms of raw performance (http://corfieldorg/entry/The_Other_ORM) In this article, Mark Mandel explains what an ORM framework is, how Transfer works, and how to get started with your Transfer application Developing all the back-end code that manages the data in a database-driven, object-oriented (OO) system can be a very long and repetitive process, and the codebase can become quite immense At an object level, we must write all the get and set methods for each of a table s columns in the system.

Auto Increment fields must be first field in table; can cause issues with migration Takes up more disk space Can be slower than MyISAM for some simpler query forms, but excels at complex multi-table queries

Note that even though the die itself is not in the eval, the context in which it is called is the eval s context, so it exits the eval, not the program as a whole This approach also works for setting and canceling alarms to catch system calls that time out; see the later section Alarms for more information..

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We have already seen how to install a signal handler by hand; simply set the value of the relevant signal in the signal hash: $SIG{INT} = \&handler; While fine for a single signal, this is cumbersome for handling many of them One way to set up multiple signals is to assign a new hash to %SIG, for example: %SIG = (%SIG, INT => IGNORE, PIPE => \&handler, HUP => \&handler); There is, however, a better way, with the sigtrap pragmatic module This takes a list of signal actions and signals, and assigns each signal the action that immediately preceded it sigtrap provides two handlers of its own: a stack-trace handler, the default action, and die, which does what it implies It also provides several keywords for common groups of signals, as well as a keyword for currently unassigned signals.

The default action is stack-trace, so the following three pragmas all have the same effect; normal-signals is the group comprising the SIGINT, SIGHUP, SIGPIPE, and SIGTERM signals: use sigtrap qw(INT HUP PIPE TERM); use sigtrap qw(stack-trace INT HUP PIPE TERM); use sigtrap qw(stack-trace normal-signals); Alternatively, we can choose to set a die handler.

If the application also incorporates objects composed of structures or arrays of other objects, we must write code to manage these collections and to match them back to the proper database tables correctly At the database level, consider the onerous task of writing all the SQL statements to do the basic create, read, update, and delete operations on the tables Then factor in the code that takes the queries for the database tables and maps them to the objects themselves This may require massaging the data that comes from the SELECT statements so that it can populate an object, or retrieving data from an object for INSERT, DELETE, or UPDATE statements There is also the problem of system maintenance.

Here are two examples of using die with the signals that sigtrap categorizes under error-signals: use sigtrap qw(die ABRT BUS EMT FPE ILL QUIT SEGV SYS TRAP); use sigtrap qw(die error-signals); We can also supply our own handler, by prefixing it with the keyword handler: use sigtrap qw(handler myhandler ALRM HUP INT); If we want to be sure the handler exists before installing it, we can drop the qw and use a subroutine reference in a regular list: use sigtrap handler => \&myhandler, qw(ALRM HUP INT); We may assign different handlers to different signals all at the same time; each signal is assigned the handler before it in the list.

The signals at the front are assigned stack-trace if the first item in the list is not die or a handler of our own devising: use sigtrap qw( stack-trace normal-signals ALRM USR2 die error-signals handler usrhandler USR1 USR2 die PWR handler inthandler INT HUP ); We can specify as many handlers and signals as we like In addition, later assignments supplant earlier ones, so handler inthandler INT HUP replaces the assignment to stack-trace of these signals in the first line (in the guise of normal-signals) If we want to assign a handler to all signals only if they have not already been assigned or ignored, we can precede the signals we want to trap conditionally with the untrapped keyword For example, to call the stack-trace handler for normal signals not already trapped: use sigtrap qw(stack-trace untrapped normal-signals);.

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