go first commit

go_cloud/internal/database/database.go

@@ -0,0 +1,29 @@
+package database
+
+import (
+	"context"
+	"database/sql"
+	"fmt"
+
+	"go.b0esche.cloud/backend/internal/config"
+
+	"github.com/jackc/pgx/v5/pgxpool"
+	"github.com/jackc/pgx/v5/stdlib"
+)
+
+func Connect(cfg *config.Config) (*sql.DB, error) {
+	ctx := context.Background()
+
+	pool, err := pgxpool.New(ctx, cfg.DatabaseURL)
+	if err != nil {
+		return nil, fmt.Errorf("failed to create pool: %w", err)
+	}
+
+	if err := pool.Ping(ctx); err != nil {
+		return nil, fmt.Errorf("failed to ping database: %w", err)
+	}
+
+	db := stdlib.OpenDBFromPool(pool)
+
+	return db, nil
+}