/
db.go
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/
db.go
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package db
import (
"database/sql"
"errors"
"io/ioutil"
"log"
"os"
"sync"
_ "github.com/mattn/go-sqlite3"
)
type Database struct {
Db *sql.DB
}
var instance *Database
var once sync.Once
func Connect() *Database {
once.Do(func() {
// create and connect to db
database, err := sql.Open("sqlite3", "./data.db")
if err != nil {
log.Fatalf("Error connecting to database: %v", err)
}
instance = &Database{Db: database}
// create db if it doesn't exist
_, err = os.Stat("./data.db")
if errors.Is(err, os.ErrNotExist) {
// load schema from file
content, err := ioutil.ReadFile("./db/schema.sql")
if err != nil {
log.Fatal(err)
}
query := string(content)
// create DB
_, err = instance.Db.Exec(query)
if err != nil {
log.Printf("Failed to initialize database: %v", err)
}
} else if err != nil {
log.Printf("[Err]: Error is checking for sqlite db - %v\n", err)
} else {
log.Println("[+]: Successfully connected to db")
}
})
return instance
}