Method dbupdate

lib_acl_cpp/samples/benchmark/sqlite/main.cpp:94–108

	}

	int dbupdate(acl::db_handle& db, int max) {
		acl::string sql, key, value;
		for (int i = 0; i < max; i++) {
			key.format("key-%d", i);
			value.format("value-%d-%d", i, i);
			sql.format("update tbl_test set value = '%s'"
				" where key='%s'", value.c_str(), key.c_str());
			if (db.sql_update(sql) == false) {
				printf("sql_update: |%s| error\r\n", sql.c_str());
				return -1;
			}
		}

		return max;
	}

	int dbdel(acl::db_handle& db, int max) {
		acl::string sql, key;