Book Image

Hands-On Go Programming

By : Tarik Guney
Book Image

Hands-On Go Programming

By: Tarik Guney

Overview of this book

<p>With its C-like speed, simplicity, and power for a growing number of system-level programming domains, Go has become increasingly popular among programmers. Hands-On Go Programming teaches you the Go programming by solving commonly faced problems with the help of recipes. You will start by installing Go binaries and get familiar with the tools used for developing an application. Once you have understood these tasks, you will be able to manipulate strings and use them in built-in function constructs to create a complex value from two floating-point values. You will discover how to perform an arithmetic operation date and time, along with parsing them from string values. In addition to this, you will cover concurrency in Go, performing various web programming tasks, implementing system programming, reading and writing files, and honing many fundamental Go programming skills such as proper error handling and logging, among others. Whether you are an expert programmer or newbie, this book helps you understand how various answers are programmed in the Go language.</p>

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Table of Contents (18 chapters)
Title Page
Title Page
Copyright and Credits
Copyright and Credits
Packt Upsell
Packt Upsell
Contributor
Contributor
Preface
Preface
Free Chapter
1
Getting Started with Go
Getting Started with Go
Installing Go binaries
A quick look at the Go language
Summary
2
Manipulating String Values
Manipulating String Values
Trimming spaces from the beginning and end of a string
Extracting sub-strings from a string value
Replacing parts of a string
Escaping characters in a string
Capitalizing string values
Summary
3
Type Conversions
Type Conversions
Converting a Boolean into a String
Converting integer and float values into a string
Parsing string values to Boolean values
Parsing string values to integer and float types
Converting a byte array into a string
Summary
4
Date and Time
Date and Time
Finding today's date and time
Adding and subtracting from a date
Finding the difference between two dates
Parsing dates and times from strings
Summary
5
Maps and Arrays
Maps and Arrays
Extracting unique elements from an array
Finding an element from an array
Reverting an array
Iterating over an array
Converting a map into an array of keys and values
Merging arrays
Merging maps
Testing for the presence of a key in a map
Summary
6
Errors and Logging
Errors and Logging
Creating custom error types
The try...catch equivalent in Go
Doing simple logging in your application
Gracefully dealing with panics
Summary
7
Files and Directories
Files and Directories
Checking the existence of a file
Reading the entire contents of a text file
Writing to a file
Creating temporary files
Counting lines in a file
Reading a particular line in a file
Comparing the contents of two files
Deleting a file
Copying or moving a file
Renaming files
Deleting a directory and its contents
Listing all the files under a directory
Summary
8
Concurrency
Concurrency
Running multiple functions concurrently
Passing data between concurrently running functions
Waiting for all concurrent functions to finish
Selecting the results of concurrent functions
Summary
9
System Programming
System Programming
Catching signals
Running child processes
Processing command-line arguments
Summary
10
Web Programming
Web Programming
Downloading a web page from the internet
Downloading files from the internet
Creating a simple web server
Creating a simple file server
Summary
11
Relational Databases
Relational Databases
Reading data from databases
Inserting data into databases
Updating data in databases
Deleting data from databases
Summary
Other Books You May Enjoy
Other Books You May Enjoy
Leave a review - let other readers know what you think
Index
Index

Reading data from databases

Let's begin with learning how to read data from SQL databases. Before we begin, we will have to create a database called personal.db. We are going to use a DB browser for SQLite that allows us to create new SQLite databases, edit them, add new records, and so on. You can find more information about the tool and download it from http://sqlitebrowser.org/. It is a free tool and it works with Windows, macOS, and Linux. Let's begin with an example. Check out the following screenshot:

Here, we have just one table, called profile. Working on this table will be sufficient for us to learn how to interact with the SQLite database, and then you can use the same techniques to interact with MySQL or SQL Server. If you check the screenshot, you can see that we have three records and four columns: ProfileId, FirstName, LastName, and Age. The FirstName and LastName columns are a string, or text, the Age column is a number, and the ProfileId is our primary key; it isalso an integer...

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