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# 组件源码 /** * <b>方法描述:</b> 集合元素数量 <br/> * <b>创建者:</b> admin <br/> * <b>创建时间:</b> 2018-05-09 11:01:56 <br/> * * @param key * 入参|key|{@link java.lang.String} * @param length * 出参|值|{@link long} * @return -1 异常<br/> * 1 成功<br/> */ @Component(label = "集合元素数量", style = "判断型", type = "同步组件", comment = "有序集合的key元素的数量,如果key不存在,则返回 0", version = "1.0.0", deprecated = false, author = "admin", date = "2018-05-09 11:01:56") @InParams(param = { @Param(name = "key", comment = "key", type = java.lang.String.class) }) @OutParams(param = { @Param(name = "length", comment = "值", type = long.class) }) @Returns(returns = { @Return(id = "-1", desp = "异常"), @Return(id = "1", desp = "成功") }) public static ResultBase P_zcard(String key) { try { long obj = redisTemplate.opsForZSet().size(key); return ResultBase.newSuccessResult(obj); } catch (Exception e) { AppLog.error(e); return ResultBase.newExceptionResult("TPTR6009", "集合元素数量 异常:" + AppLog.errorMsg(e)); } } 交易中组件使用方式: ![](https://img.kancloud.cn/11/0e/110e2ead8bce6268b4b04e649bf7f12d_950x750.jpg) ## 参数说明及示例 key:redis中的key,示例: `"qwer"` 值:返回当前集合元素的数量,示例: `__INNER__["num"]` > 有序集合的key元素的数量,如果key不存在,则返回 0