Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Worth it if you are serious about Perl DBI

The man pages and perl doc just do not cover the details in depth enough for professional use of the perl DBI. While this book contains a lot of introductory material, the later chapters include many details that I have just not seen in any other reference -details that can make or break a program.If all you are is a hacker that uses ->do() everywhere, never check error returns, don't know what an array of hash references is good for, then the contents of this book are not for you. The man pages are plenty. But if you really care about performance, and how to write programs that make the most of the facilities at hand, this book gives the details that aren't in the man pages.For Perl programmers the Perl DBI is one of the most important facilities in the language. Understanding it depth is one of the requisities of Perl guru-dom.