(window.webpackJsonp=window.webpackJsonp||[]).push([[423],{989:function(s,t,e){"use strict";e.r(t);var a=e(69),n=Object(a.a)({},(function(){var s=this,t=s.$createElement,e=s._self._c||t;return e("ContentSlotsDistributor",{attrs:{"slot-key":s.$parent.slotKey}},[e("h1",{attrs:{id:"tsfile-api"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#tsfile-api"}},[s._v("#")]),s._v(" TsFile API")]),s._v(" "),e("p",[s._v("TsFile 是在 IoTDB 中使用的时间序列的文件格式。在这个章节中，我们将介绍这种文件格式的用法。")]),s._v(" "),e("h2",{attrs:{id:"安装-tsfile-libaray"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#安装-tsfile-libaray"}},[s._v("#")]),s._v(" 安装 TsFile libaray")]),s._v(" "),e("p",[s._v("在您自己的项目中有两种方法使用 TsFile .")]),s._v(" "),e("ul",[e("li",[e("p",[s._v("使用 jar 包:")]),s._v(" "),e("ul",[e("li",[e("p",[s._v("编译源码生成 jar 包")]),s._v(" "),e("div",{staticClass:"language- line-numbers-mode"},[e("pre",{pre:!0,attrs:{class:"language-text"}},[e("code",[s._v("git clone https://github.com/apache/iotdb.git\ncd tsfile/\nmvn clean package 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"),e("h3",{attrs:{id:"时序数据-time-series-data"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#时序数据-time-series-data"}},[s._v("#")]),s._v(" 时序数据(Time-series Data)")]),s._v(" "),e("p",[s._v("一个时序是由4个序列组成，分别是 device, measurement, time, value。")]),s._v(" "),e("ul",[e("li",[e("p",[e("strong",[s._v("measurement")]),s._v(": 时间序列描述的是一个物理或者形式的测量(measurement)，比如：城市的温度，一些商品的销售数量或者是火车在不同时间的速度。\n传统的传感器(如温度计)也采用单次测量(measurement)并产生时间序列，我们将在下面交替使用测量(measurement)和传感器。")])]),s._v(" "),e("li",[e("p",[e("strong",[s._v("device")]),s._v(": 一个设备指的是一个正在进行多次测量(产生多个时间序列)的实体，例如，\n​    ​    ​    一列正在运行的火车监控它的速度、油表、它已经运行的英里数，当前的乘客每个都被传送到一个时间序列。")])])]),s._v(" "),e("p",[s._v('表1描述了一组时间序列数据。下表中显示的集合包含一个名为 "device_1" 的设备，它有三个测量值(measurement)分别是\n"sensor_1", "sensor_2" 和 "sensor_3".')]),s._v(" "),e("center",[e("table",{staticStyle:{"text-align":"center"}},[e("tr",[e("th",{attrs:{colspan:"6"}},[s._v("device_1")])]),s._v(" 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在许多工业应用程序中，一个设备通常包含多个传感器，这些传感器可能同时具有多个值，这称为一行数据。")]),s._v(" "),e("p",[s._v("在形式上，一行数据包含一个"),e("code",[s._v("device_id")]),s._v("，它是一个时间戳，表示从 1970年1月1日 00:00:00 开始的毫秒数,\n以及由"),e("code",[s._v("measurement_id")]),s._v("和相应的"),e("code",[s._v("value")]),s._v("组成的几个数据对。一行中的所有数据对都属于这个"),e("code",[s._v("device_id")]),s._v("，并且具有相同的时间戳。\n如果其中一个度量值"),e("code",[s._v("measurements")]),s._v("在某个时间戳"),e("code",[s._v("timestamp")]),s._v("没有值"),e("code",[s._v("value")]),s._v("，将使用一个空格表示(实际上 TsFile 并不存储 null 值)。\n其格式如下：")]),s._v(" "),e("div",{staticClass:"language- line-numbers-mode"},[e("pre",{pre:!0,attrs:{class:"language-text"}},[e("code",[s._v("device_id, timestamp, <measurement_id, value>...\n")])]),s._v(" "),e("div",{staticClass:"line-numbers-wrapper"},[e("span",{staticClass:"line-number"},[s._v("1")]),e("br")])]),e("p",[s._v("示例数据如下所示。在本例中，两个度量值(measurement)的数据类型分别是"),e("code",[s._v("INT32")]),s._v("和"),e("code",[s._v("FLOAT")]),s._v("。")]),s._v(" "),e("div",{staticClass:"language- 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MeasurementSchema> measurements)\n// Some useful getter and checker\npublic TSDataType getMeasurementDataType(String measurementId)\npublic MeasurementSchema getMeasurementSchema(String measurementId)\npublic Map<String, MeasurementSchema> getAllMeasurementSchema()\npublic boolean hasMeasurement(String measurementId)\n")])]),s._v(" 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"),e("div",{staticClass:"line-numbers-wrapper"},[e("span",{staticClass:"line-number"},[s._v("1")]),e("br"),e("span",{staticClass:"line-number"},[s._v("2")]),e("br")])]),e("div",{staticClass:"language- line-numbers-mode"},[e("pre",{pre:!0,attrs:{class:"language-text"}},[e("code",[s._v("IExpression timeFilterExpr = BinaryExpression.or(new GlobalTimeExpression(TimeFilter.gtEq(15L)),\n                                         new GlobalTimeExpression(TimeFilter.lt(25L))); // series time >= 15 or series time < 25\n")])]),s._v(" "),e("div",{staticClass:"line-numbers-wrapper"},[e("span",{staticClass:"line-number"},[s._v("1")]),e("br"),e("span",{staticClass:"line-number"},[s._v("2")]),e("br")])])])]),s._v(" "),e("h4",{attrs:{id:"读取接口"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#读取接口"}},[s._v("#")]),s._v(" 读取接口")]),s._v(" "),e("p",[s._v("首先，我们打开 TsFile 并从文件路径"),e("code",[s._v("path")]),s._v("中获取一个"),e("code",[s._v("ReadOnlyTsFile")]),s._v("实例。")]),s._v(" 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