更新时间:2024-11-26 GMT+08:00
统计查询
功能介绍
返回满足查询条件的实体总量,不返回数据的具体信息,代码中设置setCountOnly()。
可以参考以下样例代码。
样例代码
public void testCountOnlyQuery() { LOG.info("Entering testCountOnlyQuery."); try (Table table = conn.getTable(tableName)) { // Using Table instance to create LemonTable. LemonTable lemonTable = new LemonTable(table); // Build LemonQuery. LemonQuery query = LemonQuery.builder() // Set ad-hoc query condition. .setQuery("education:bachelor OR education:master") // just return how many entities meet the query condition, without any rowkey/column .setCountOnly() .build(); ResultSet resultSet = lemonTable.query(query); // Read result rows. int count = resultSet.getCount(); LOG.info("the entity count of query is " + count); } catch (IOException e) { LOG.error("testCountOnlyQuery failed ", e); } LOG.info("Exiting testCountOnlyQuery."); }
父主题: 样例代码说明