How can I use the Go SQL package for database operations?

How can I use the Go SQL package for database operations?

The Go SQL package provides a generic interface for interacting with SQL databases. You can use it to execute queries, manage transactions, and handle results.

Can you show me a simple example of connecting to a database?

Sure! Here's a basic example:

package main

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

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

    // Check if the connection is valid
    err = db.Ping()
    if err != nil {
        log.Fatal(err)
    }
    log.Println("Connected to the database!")
}

What about executing a query and retrieving results?

You can execute a query using db.Query or db.QueryRow. Here's an example:

rows, err := db.Query("SELECT id, name FROM users")
if err != nil {
    log.Fatal(err)
}
defer rows.Close()

for rows.Next() {
    var id int
    var name string
    if err := rows.Scan(&id, &name); err != nil {
        log.Fatal(err)
    }
    log.Printf("User: %d, Name: %s", id, name)
}
if err := rows.Err(); err != nil {
    log.Fatal(err)
}