Added database package

database/connect.go

@@ -0,0 +1,43 @@
+package database
+
+import (
+	"context"
+	"errors"
+
+	"github.com/jackc/pgx/v5/pgconn"
+	"github.com/jackc/pgx/v5/pgxpool"
+)
+
+func Connect(connStr string) (*pgxpool.Pool, error) {
+	pool, err := pgxpool.New(context.Background(), connStr)
+	if err != nil {
+		return nil, err
+	}
+
+	return pool, nil
+}
+
+func IsDuplicatedRow(err error) error {
+	var pgErr *pgconn.PgError
+
+	if errors.As(err, &pgErr) && pgErr.Code == "23505" {
+		return errors.New("duplicated row found")
+	}
+
+	return nil
+}
+
+// FIXME get an idea how this func should work
+// func NoRowsInQuerySet(err error) error {
+// 	var pgErr *pgconn.PgError
+
+// 	if errors.As(err, &pgErr) {
+// 		fmt.Println("pgerr:", pgErr.Code)
+// 		return errors.New("no rows selected")
+// 	}
+// 	// if err == pgconn. {
+// 	// 	fmt.Println("No rows were found.")
+// 	// }
+
+// 	return nil
+// }