Learning Golang: Relational Databases – Introduction to database/sql

Let’s learn about accessing Relational Databases in Go/Golang using the standard library, specifically using “database/sql” and a concrete driver, which in this case is going to be “pgx”.

This first episode introduces you to “database/sql” the default way to access Relational Databases in Go/Golang, I will cover the basic instructions to:
* Open a Connection using “sql.Open”
* Ping the connection using “db.PingContext” (also “db.Ping” works)
* Query one row using “db.QueryRowContext” (also “db.QueryRow” works)
* Query multiple rows using “db.QueryContext” (also “db.Query works)
* Inserting records using “db.ExecContext” (also “db.Exec” works)

This is the foundation of future videos that will come, also a few things to keep in mind regarding Relational Databases in Go/Golang:
* Go/Golang does not provide any official drivers, however it provides database/sql
* Typically drivers implement only that interface, but some like pgx add their own
* Nowadays we should be using the context-like methods when accessing databases

== Relevant links

* Example code: https://github.com/MarioCarrion/videos/tree/0e574a88b82ea18400ca525e01afd98d9f014e18/2021/11/17
* PostgreSQL driver and toolkit for Go: https://github.com/jackc/pgx
* Previous Episode: “Learning Golang: Functional Options / Default Configuration Values Pattern”: https://youtu.be/fe8vJSIzWss
* “Software Architecture in Golang: Security – Databases, SQL Injection and Permissions” https://youtu.be/eixRIh80-F8
* “Learning Golang: Context package: Cancellations, Deadlines and Request-scoped values” https://youtu.be/mgJMIZsWfB4

== All Go/Golang video series covered

* Playlist “Learning Go”: https://www.youtube.com/playlist?list=PL7yAAGMOat_F7bOImcjx4ZnCtfyNEqzCy
* Playlist “Software Architecture in Go”: https://www.youtube.com/playlist?list=PL7yAAGMOat_GCd12Lrv_evJ3Zhv1dl8B-
* Playlist “Learning Go/Golang Concurrency Patterns” https://www.youtube.com/playlist?list=PL7yAAGMOat_Fhj_px_DzNzTsXs-mRwv1t
* Playlist “Building Microservices in Go”: https://www.youtube.com/playlist?list=PL7yAAGMOat_Fn8sAXIk0WyBfK_sT1pohu
* Playlist “GoTools and Packages”: https://www.youtube.com/playlist?list=PL7yAAGMOat_HEEOvH99agDs_5g51A0Ls3
* Playlist “Testing in Go”: https://www.youtube.com/playlist?list=PL7yAAGMOat_HSeW4zF0uRL9EaHadE4ZZq

== Socials

* https://twitter.com/MarioCarrion
* https://www.instagram.com/mario.carrion
* https://linkedin.com/in/MarioCarrion

00:00 – Start
02:34 – Importing pgx for PostgreSQL in Golang
07:00 – Connecting to PostgreSQL using pgx in Golang
11:10 – Selecting row in PostgreSQL using pgx in Golang
15:20 – Inserting records in PostgreSQL using pgx in Golang
20:50 – Selecting multiple rows in PostgreSQL using pgx in Golang
24:40 – Conclusions

—

Who am I:

Hello👋🏼! I’m Mario, a Hands-on Software Architect and Lead Backend Engineer with more than 16 years of professional experience building all kinds of software including on-premise Industrial Automation Systems, Linux Accessibility Desktop and Browser Components as well as Distributed Advertising Microservices.

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