Question

Which ot the following statements writes the key “Atlanta” and the value “GA” to a DBM database named citystate? The database is tied to the %city hash. a. %city{GA> = "Atlanta"; b. $$\$citystate{Atlanta}$$ = "GA"; c. $$\$city{Atlanta}$$ = "GA" ; d. None ot the above.

Name: Problem 4, Chapter 9: CGI/Perl (Web Warrior Series)
Uploaded: 2024-01-10T18:24:01-08:00
Duration: 1 min 47 s
Channel: Maria Dearborn
Description: Which ot the following statements writes the key “Atlanta” and the value “GA” to a DBM database named citystate? The database is tied to the %city hash. a. %city{GA> = "Atlanta"; b. \citystate{Atlanta} = "GA"; c. \city{Atlanta} = "GA" ; d. None ot the above.

   Which ot the following statements writes the key “Atlanta” and the value “GA” to a DBM database named citystate? The database is tied to the %city hash.
a. %city{GA> = "Atlanta";
b. $$\$citystate{Atlanta}$$ = "GA";
c. $$\$city{Atlanta}$$ = "GA" ;
d. None ot the above.

CGI/Perl (Web Warrior Series)

Diane Zak 1st Edition

Chapter 9, Problem 4

Instant Answer

Solved by Expert Maria Dearborn

01/10/2024

Step 1

The database is tied to the %city hash. Option a: %city{GA> = "Atlanta"; This statement is incorrect because it uses the wrong syntax for accessing a hash. The correct syntax is %hashname{key} = value, but in this case, it is using the value "GA" as the key and Show more…

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Which ot the following statements writes the key “Atlanta” and the value “GA” to a DBM database named citystate? The database is tied to the %city hash. a. %city{GA> = "Atlanta"; b. $$\$citystate{Atlanta}$$ = "GA"; c. $$\$city{Atlanta}$$ = "GA" ; d. None ot the above.

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Key Concepts

DBM Databases

DBM databases are disk-based key-value stores that provide a simple way to handle persistent data. They are often used in conjunction with tied hashes in Perl to allow for efficient data storage and retrieval without having to manage file I/O manually.

Tied Hashes

In Perl, a tied hash is one that is bound to an underlying data storage mechanism, such as a DBM database. This allows the hash operations (like storing and fetching values) to directly interface with the database, making persistent storage as simple as using a regular hash in Perl.

Perl Hash Assignment Syntax

Perl uses a straightforward syntax for assigning values to hashes, regardless of whether the hash is a regular one or tied to a DBM database. The standard form, using $hash{key} = value, is employed even when the hash is tied to persistent storage, abstracting the complexities involved in interacting with the database.

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