add db-wrapper package types

internal/app/db-wrapper/postgres.go

@@ -0,0 +1,34 @@
+package dbwrapper
+
+import (
+	"context"
+
+	"github.com/jackc/pgx/v5/pgxpool"
+)
+
+type postgresDbWrapper struct {
+	db *pgxpool.Pool
+}
+
+func (wrapper *postgresDbWrapper) Connect(ctx context.Context, dbUrl string) error { return nil }
+
+func (wrapper *postgresDbWrapper) Close() error { return nil }
+
+func (wrapper *postgresDbWrapper) Exec(ctx context.Context, query string, args ...any) (ExecResult, error) {
+	result, err := wrapper.db.Exec(ctx, query, args...)
+	if err != nil {
+		return ExecResult{}, err
+	}
+
+	return ExecResult{
+		AffectedRows: result.RowsAffected(),
+	}, nil
+}
+
+func (wrapper *postgresDbWrapper) Query(ctx context.Context, query string, args ...any) (RowsResult, error) {
+	return nil, nil
+}
+
+func (wrapper *postgresDbWrapper) SaveMassive(ctx context.Context, schema string, table string, columnNames []string, rows [][]any) (int64, error) {
+	return 0, nil
+}