fix: error handling in db conn

examples/golang-api-with-postgres-and-sqlc/db/database.go

@@ -2,6 +2,7 @@ package db
 
 import (
 	"context"
+	"fmt"
 	"go-postgres-sqlc/db/sqlc"
 	"log"
 
@@ -17,11 +18,11 @@ type DB struct {
 }
 
 // New initializes a new DBConfig instance
-func New(dsn string) *DB {
+func New(dsn string) (*DB, error) {
 	ctx := context.Background()
 	conn, err := pgx.Connect(ctx, dsn)
 	if err != nil {
-		log.Fatalf("Unable to connect to database: %v", err)
+		return nil, fmt.Errorf("unable to connect to database: %v", err)
 	}
 	log.Println("Connected to database")
 
@@ -32,5 +33,5 @@ func New(dsn string) *DB {
 		Context: ctx,
 		Conn:    conn,
 		Queries: queries,
-	}
+	}, nil
 }

examples/golang-api-with-postgres-and-sqlc/main.go

@@ -1,6 +1,7 @@
 package main
 
 import (
+	"fmt"
 	"go-postgres-sqlc/db"
 	"go-postgres-sqlc/handler"
 	"log"
@@ -13,9 +14,14 @@ import (
 )
 
 func main() {
-	db := db.New("postgres://postgres:postgres@db:5432/poc?sslmode=disable")
-	runMigrations(db)
-
+	db, err := db.New("postgres://postgres:postgres@db:5432/poc?sslmode=disable")
+	if err != nil {
+		log.Fatal(err)
+	}
+	err = runMigrations(db)
+	if err != nil {
+		log.Fatal(err)
+	}
 	userRepo := repository.NewUser(db)
 	userSvc := service.NewUser(userRepo)
 	userHandler := handler.NewUser(userSvc)
@@ -27,13 +33,13 @@ func main() {
 	base.HandleFunc("/user/{id:[0-9]+}", userHandler.GetUser).Methods(http.MethodGet)
 	base.HandleFunc("/user", userHandler.CreateUser).Methods(http.MethodPost)
 
-	err := http.ListenAndServe(":8080", base)
+	err = http.ListenAndServe(":8080", base)
 	if err != nil {
 		log.Fatal(err)
 	}
 }
 
-func runMigrations(db *db.DB) {
+func runMigrations(db *db.DB) error {
 	query := `CREATE TABLE IF NOT EXISTS users (
 		id BIGINT GENERATED ALWAYS AS IDENTITY PRIMARY KEY,
 		username VARCHAR(30) NOT NULL,
@@ -43,7 +49,8 @@ func runMigrations(db *db.DB) {
 	)`
 	_, err := db.Conn.Exec(db.Context, query)
 	if err != nil {
-		log.Fatalf("Failed to create users table: %v", err)
+		return fmt.Errorf("failed to create users table: %v", err)
 	}
 	log.Println("Users table created or already exists.")
+	return nil
 }