How are requests to the PostgreSQL database executed?

Executing queries to a PostgreSQL database usually occurs through a client library that establishes a connection to the database server, sends an SQL query, and receives the result.

In Go, the database/sql package is often used with a driver, such as github.com/lib/pq.

Example of a simple query execution:

import (
    "database/sql"
    _ "github.com/lib/pq"
    "log"
)

func main() {
    connStr := "user=username dbname=mydb sslmode=disable"
    db, err := sql.Open("postgres", connStr)
    if err != nil {
        log.Fatal(err)
    }
    defer db.Close()

    var name string
    err = db.QueryRow("SELECT name FROM users WHERE id = $1", 1).Scan(&name)
    if err != nil {
        log.Fatal(err)
    }
    log.Println("User name:", name)
}

This involves:

• Opening a connection to the database.
• Executing a parameterized query.
• Scanning the result into a variable.

PostgreSQL processes the query, optimizes it, executes it, and returns the result to the client.