| (window.webpackJsonp=window.webpackJsonp||[]).push([[555],{951:function(s,t,a){"use strict";a.r(t);var e=a(29),r=Object(e.a)({},(function(){var s=this,t=s._self._c;return t("ContentSlotsDistributor",{attrs:{"slot-key":s.$parent.slotKey}},[t("h1",{attrs:{id:"删除数据"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#删除数据"}},[s._v("#")]),s._v(" 删除数据")]),s._v(" "),t("p",[s._v("用户使用 "),t("RouterLink",{attrs:{to:"/zh/UserGuide/Master/Reference/SQL-Reference.html"}},[s._v("DELETE 语句")]),s._v(" 可以删除指定的时间序列中符合时间删除条件的数据。在删除数据时，用户可以选择需要删除的一个或多个时间序列、时间序列的前缀、时间序列带、*路径对某一个时间区间内的数据进行删除。")],1),s._v(" "),t("p",[s._v("在 JAVA 编程环境中，您可以使用 JDBC API 单条或批量执行 DELETE 语句。")]),s._v(" "),t("h2",{attrs:{id:"单传感器时间序列值删除"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#单传感器时间序列值删除"}},[s._v("#")]),s._v(" 单传感器时间序列值删除")]),s._v(" "),t("p",[s._v("以测控 ln 集团为例，存在这样的使用场景：")]),s._v(" "),t("p",[s._v("wf02 子站的 wt02 设备在 2017-11-01 16:26:00 之前的供电状态出现多段错误，且无法分析其正确数据，错误数据影响了与其他设备的关联分析。此时，需要将此时间段前的数据删除。进行此操作的 SQL 语句为：")]),s._v(" "),t("div",{staticClass:"language-sql line-numbers-mode"},[t("pre",{pre:!0,attrs:{class:"language-sql"}},[t("code",[t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("delete")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("from")]),s._v(" root"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),s._v("ln"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),s._v("wf02"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),s._v("wt02"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("status")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("where")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("time")]),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v("<=")]),t("span",{pre:!0,attrs:{class:"token number"}},[s._v("2017")]),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v("-")]),t("span",{pre:!0,attrs:{class:"token number"}},[s._v("11")]),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v("-")]),t("span",{pre:!0,attrs:{class:"token number"}},[s._v("01")]),s._v("T16:"),t("span",{pre:!0,attrs:{class:"token number"}},[s._v("26")]),s._v(":"),t("span",{pre:!0,attrs:{class:"token number"}},[s._v("00")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(";")]),s._v("\n")])]),s._v(" "),t("div",{staticClass:"line-numbers-wrapper"},[t("span",{staticClass:"line-number"},[s._v("1")]),t("br")])]),t("p",[s._v("如果我们仅仅想要删除 2017 年内的在 2017-11-01 16:26:00 之前的数据，可以使用以下 SQL:")]),s._v(" "),t("div",{staticClass:"language-sql line-numbers-mode"},[t("pre",{pre:!0,attrs:{class:"language-sql"}},[t("code",[t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("delete")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("from")]),s._v(" root"),t("span",{pre:!0,attrs:{class:"token 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"),t("div",{staticClass:"line-numbers-wrapper"},[t("span",{staticClass:"line-number"},[s._v("1")]),t("br"),t("span",{staticClass:"line-number"},[s._v("2")]),t("br"),t("span",{staticClass:"line-number"},[s._v("3")]),t("br"),t("span",{staticClass:"line-number"},[s._v("4")]),t("br"),t("span",{staticClass:"line-number"},[s._v("5")]),t("br"),t("span",{staticClass:"line-number"},[s._v("6")]),t("br"),t("span",{staticClass:"line-number"},[s._v("7")]),t("br")])]),t("p",[s._v("需要注意，当前的删除语句不支持 where 子句后的时间范围为多个由 OR 连接成的时间区间。如下删除语句将会解析出错：")]),s._v(" "),t("div",{staticClass:"language- line-numbers-mode"},[t("pre",{pre:!0,attrs:{class:"language-text"}},[t("code",[s._v("delete from root.ln.wf02.wt02.status where time > 4 or time < 0\nMsg: 303: Check metadata error: For delete statement, where clause can only contain atomic\nexpressions like : time > XXX, time <= XXX, or two atomic expressions connected by 'AND'\n")])]),s._v(" "),t("div",{staticClass:"line-numbers-wrapper"},[t("span",{staticClass:"line-number"},[s._v("1")]),t("br"),t("span",{staticClass:"line-number"},[s._v("2")]),t("br"),t("span",{staticClass:"line-number"},[s._v("3")]),t("br")])]),t("p",[s._v("如果 delete 语句中未指定 where 子句，则会删除时间序列中的所有数据。")]),s._v(" "),t("div",{staticClass:"language-sql line-numbers-mode"},[t("pre",{pre:!0,attrs:{class:"language-sql"}},[t("code",[t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("delete")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("from")]),s._v(" root"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),s._v("ln"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),s._v("wf02"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("status")]),s._v("\n")])]),s._v(" "),t("div",{staticClass:"line-numbers-wrapper"},[t("span",{staticClass:"line-number"},[s._v("1")]),t("br")])]),t("h2",{attrs:{id:"多传感器时间序列值删除"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#多传感器时间序列值删除"}},[s._v("#")]),s._v(" 多传感器时间序列值删除")]),s._v(" "),t("p",[s._v("当 ln 集团 wf02 子站的 wt02 设备在 2017-11-01 16:26:00 之前的供电状态和设备硬件版本都需要删除，此时可以使用含义更广的 "),t("RouterLink",{attrs:{to:"/zh/UserGuide/Master/Data-Concept/Data-Model-and-Terminology.html"}},[s._v("路径模式（Path Pattern）")]),s._v(" 进行删除操作，进行此操作的 SQL 语句为：")],1),s._v(" "),t("div",{staticClass:"language-sql line-numbers-mode"},[t("pre",{pre:!0,attrs:{class:"language-sql"}},[t("code",[t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("delete")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("from")]),s._v(" root"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),s._v("ln"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),s._v("wf02"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),s._v("wt02"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v("*")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("where")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("time")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v("<=")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token number"}},[s._v("2017")]),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v("-")]),t("span",{pre:!0,attrs:{class:"token number"}},[s._v("11")]),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v("-")]),t("span",{pre:!0,attrs:{class:"token number"}},[s._v("01")]),s._v("T16:"),t("span",{pre:!0,attrs:{class:"token number"}},[s._v("26")]),s._v(":"),t("span",{pre:!0,attrs:{class:"token number"}},[s._v("00")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(";")]),s._v("\n")])]),s._v(" "),t("div",{staticClass:"line-numbers-wrapper"},[t("span",{staticClass:"line-number"},[s._v("1")]),t("br")])]),t("p",[s._v("需要注意的是，当删除的路径不存在时，IoTDB 不会提示路径不存在，而是显示执行成功，因为 SQL 是一种声明式的编程方式，除非是语法错误、权限不足等，否则都不认为是错误，如下所示。")]),s._v(" "),t("div",{staticClass:"language-sql line-numbers-mode"},[t("pre",{pre:!0,attrs:{class:"language-sql"}},[t("code",[s._v("IoTDB"),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v(">")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("delete")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("from")]),s._v(" root"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),s._v("ln"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),s._v("wf03"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),s._v("wt02"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("status")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("where")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("time")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v("<")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token function"}},[s._v("now")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("(")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(")")]),s._v("\nMsg: The statement "),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v("is")]),s._v(" executed successfully"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),s._v("\n")])]),s._v(" "),t("div",{staticClass:"line-numbers-wrapper"},[t("span",{staticClass:"line-number"},[s._v("1")]),t("br"),t("span",{staticClass:"line-number"},[s._v("2")]),t("br")])]),t("h2",{attrs:{id:"删除时间分区-实验性功能"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#删除时间分区-实验性功能"}},[s._v("#")]),s._v(" 删除时间分区 （实验性功能）")]),s._v(" "),t("p",[s._v("您可以通过如下语句来删除某一个存储组下的指定时间分区：")]),s._v(" "),t("div",{staticClass:"language-sql line-numbers-mode"},[t("pre",{pre:!0,attrs:{class:"language-sql"}},[t("code",[t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("DELETE")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("PARTITION")]),s._v(" root"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),s._v("ln "),t("span",{pre:!0,attrs:{class:"token number"}},[s._v("0")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(",")]),t("span",{pre:!0,attrs:{class:"token number"}},[s._v("1")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(",")]),t("span",{pre:!0,attrs:{class:"token number"}},[s._v("2")]),s._v("\n")])]),s._v(" "),t("div",{staticClass:"line-numbers-wrapper"},[t("span",{staticClass:"line-number"},[s._v("1")]),t("br")])]),t("p",[s._v("上例中的 0,1,2 为待删除时间分区的 id，您可以通过查看 IoTDB 的数据文件夹找到它，或者可以通过计算"),t("code",[s._v("timestamp / partitionInterval")]),s._v("（向下取整）,\n手动地将一个时间戳转换为对应的 id，其中的"),t("code",[s._v("partitionInterval")]),s._v("可以在 IoTDB 的配置文件中找到（如果您使用的版本支持时间分区）。")]),s._v(" "),t("p",[s._v("请注意该功能目前只是实验性的，如果您不是开发者，使用时请务必谨慎。")])])}),[],!1,null,null,null);t.default=r.exports}}]); |