Question

Which of the following functions binds a hash to a DBM database? a. bind b. bindhash c. tie d. hashtie

   Which of the following functions binds a hash to a DBM database?
a. bind
b. bindhash
c. tie
d. hashtie

CGI/Perl (Web Warrior Series)

CGI/Perl (Web Warrior Series)

Diane Zak 1st Edition

Chapter 9, Problem 1

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Step 1

This means that we want to associate a hash with a DBM database so that any changes made to the hash will also be reflected in the database. The function that accomplishes this is the "tie" function. The "tie" function is used to associate a hash with a DBM Show more…

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Which of the following functions binds a hash to a DBM database? a. bind b. bindhash c. tie d. hashtie

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Key Concepts

DBM Database

A DBM database is a simple on-disk key-value storage system used in many programming languages, notably in Perl. It is designed for efficient storage and retrieval of data, serving as an intermediary between the program's in-memory data structures and persistent storage.

Hash Data Structure

A hash is an associative array, a data structure that stores key-value pairs. In languages like Perl, hashes provide efficient lookups and are fundamental for handling sets of data where elements are identified by unique keys.

Tied Variables

Tied variables are a feature in Perl that allow developers to associate or 'tie' standard variables (like hashes) with underlying data sources or objects. This mechanism makes it possible to override the standard behavior of these variables, enabling them to interact with external storage systems like a DBM database seamlessly.

tie Function

The tie function is used in Perl to bind a standard variable, such as a hash, to a specific class that implements the desired underlying data handling. This function abstracts the interfacing between the in-memory variable and the external storage system, for example, allowing a hash to be automatically synchronized with a DBM database.

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