Book Image

The Go Workshop

By : Delio D'Anna, Andrew Hayes, Sam Hennessy, Jeremy Leasor, Gobin Sougrakpam, Dániel Szabó
5 (2)
Book Image

The Go Workshop

5 (2)
By: Delio D'Anna, Andrew Hayes, Sam Hennessy, Jeremy Leasor, Gobin Sougrakpam, Dániel Szabó

Overview of this book

The Go Workshop will take the pain out of learning the Go programming language (also known as Golang). It is designed to teach you to be productive in building real-world software. Presented in an engaging, hands-on way, this book focuses on the features of Go that are used by professionals in their everyday work. Each concept is broken down, clearly explained, and followed up with activities to test your knowledge and build your practical skills. Your first steps will involve mastering Go syntax, working with variables and operators, and using core and complex types to hold data. Moving ahead, you will build your understanding of programming logic and implement Go algorithms to construct useful functions. As you progress, you'll discover how to handle errors, debug code to troubleshoot your applications, and implement polymorphism using interfaces. The later chapters will then teach you how to manage files, connect to a database, work with HTTP servers and REST APIs, and make use of concurrent programming. Throughout this Workshop, you'll work on a series of mini projects, including a shopping cart, a loan calculator, a working hours tracker, a web page counter, a code checker, and a user authentication system. By the end of this book, you'll have the knowledge and confidence to tackle your own ambitious projects with Go.
Table of Contents (21 chapters)
Free Chapter
1
1. Variables and Operators
2
2. Logic and Loops

Retrieving Data

SQL injection does not only concern the data being inserted. It also concerns any data that is manipulated in the database. Retrieving data and, most importantly, retrieving it safely is also something we must prioritize and handle with proper caution. When we query data, our results depend on the database we connect to and the table we would like to query. But we must also mention that the security mechanisms implemented by the database engine may also prevent a successful query unless the user has appropriate privileges. We differentiate two types of queries. There are queries that do not take an argument, such as SELECT * FROM table, and there are queries that require you to specify filter criteria. Go provides two functions that allow you to query data. One is called the Query() function and the other is called the QueryRow() function. The availability of these functions depends on the database you are interacting with. As a rule of thumb, you should remember that...