(window.webpackJsonp=window.webpackJsonp||[]).push([[525],{1094:function(s,e,t){"use strict";t.r(e);var a=t(70),i=Object(a.a)({},(function(){var s=this,e=s.$createElement,t=s._self._c||e;return t("ContentSlotsDistributor",{attrs:{"slot-key":s.$parent.slotKey}},[t("h2",{attrs:{id:"java-原生接口"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#java-原生接口"}},[s._v("#")]),s._v(" Java 原生接口")]),s._v(" "),t("h3",{attrs:{id:"依赖"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#依赖"}},[s._v("#")]),s._v(" 依赖")]),s._v(" "),t("ul",[t("li",[s._v("JDK >= 1.8")]),s._v(" "),t("li",[s._v("Maven >= 3.6")])]),s._v(" "),t("h3",{attrs:{id:"安装方法"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#安装方法"}},[s._v("#")]),s._v(" 安装方法")]),s._v(" "),t("p",[s._v("在根目录下运行:")]),s._v(" "),t("div",{staticClass:"language- line-numbers-mode"},[t("pre",{pre:!0,attrs:{class:"language-text"}},[t("code",[s._v("mvn clean install -pl session -am -Dmaven.test.skip=true\n")])]),s._v(" 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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("ul",[t("li",[s._v("删除一个或多个时间序列在某个时间点前或这个时间点的数据")])]),s._v(" "),t("div",{staticClass:"language- line-numbers-mode"},[t("pre",{pre:!0,attrs:{class:"language-text"}},[t("code",[s._v("void deleteData(String path, long time)\nvoid deleteData(List<String> paths, long time)\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("ul",[t("li",[s._v("插入一个 Record，一个 Record 是一个设备一个时间戳下多个测点的数据。服务器需要做类型推断，可能会有额外耗时")])]),s._v(" "),t("div",{staticClass:"language- line-numbers-mode"},[t("pre",{pre:!0,attrs:{class:"language-text"}},[t("code",[s._v("void insertRecord(String deviceId, long time, List<String> measurements, List<String> values)\n")])]),s._v(" 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"),t("div",{staticClass:"language- line-numbers-mode"},[t("pre",{pre:!0,attrs:{class:"language-text"}},[t("code",[s._v("void executeNonQueryStatement(String sql)\n")])]),s._v(" "),t("div",{staticClass:"line-numbers-wrapper"},[t("span",{staticClass:"line-number"},[s._v("1")]),t("br")])]),t("h3",{attrs:{id:"测试接口说明"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#测试接口说明"}},[s._v("#")]),s._v(" 测试接口说明")]),s._v(" "),t("ul",[t("li",[s._v("测试 testInsertRecords，不实际写入数据，只将数据传输到 server 即返回。")])]),s._v(" "),t("div",{staticClass:"language- line-numbers-mode"},[t("pre",{pre:!0,attrs:{class:"language-text"}},[t("code",[s._v("void testInsertRecords(List<String> deviceIds, List<Long> times, List<List<String>> measurementsList, List<List<String>> valuesList)\n")])]),s._v(" "),t("div",{staticClass:"line-numbers-wrapper"},[t("span",{staticClass:"line-number"},[s._v("1")]),t("br")])]),t("p",[s._v("或")]),s._v(" "),t("div",{staticClass:"language- 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"),t("p",[s._v("我们提供了一个针对原生接口的连接池("),t("code",[s._v("SessionPool")]),s._v(")，使用该接口时，你只需要指定连接池的大小，就可以在使用时从池中获取连接。\n如果超过60s都没得到一个连接的话，那么会打印一条警告日志，但是程序仍将继续等待。")]),s._v(" "),t("p",[s._v("当一个连接被用完后，他会自动返回池中等待下次被使用；\n当一个连接损坏后，他会从池中被删除，并重建一个连接重新执行用户的操作。")]),s._v(" "),t("p",[s._v("对于查询操作：")]),s._v(" "),t("ol",[t("li",[s._v("使用SessionPool进行查询时，得到的结果集是"),t("code",[s._v("SessionDataSet")]),s._v("的封装类"),t("code",[s._v("SessionDataSetWrapper")]),s._v(";")]),s._v(" "),t("li",[s._v("若对于一个查询的结果集，用户并没有遍历完且不再想继续遍历时，需要手动调用释放连接的操作"),t("code",[s._v("closeResultSet")]),s._v(";")]),s._v(" "),t("li",[s._v("若对一个查询的结果集遍历时出现异常，也需要手动调用释放连接的操作"),t("code",[s._v("closeResultSet")]),s._v(".")]),s._v(" "),t("li",[s._v("可以调用 "),t("code",[s._v("SessionDataSetWrapper")]),s._v(" 的 "),t("code",[s._v("getColumnNames()")]),s._v(" 方法得到结果集列名")])]),s._v(" "),t("p",[s._v("使用示例可以参见 "),t("code",[s._v("session/src/test/java/org/apache/iotdb/session/pool/SessionPoolTest.java")])]),s._v(" "),t("p",[s._v("或 "),t("code",[s._v("example/session/src/main/java/org/apache/iotdb/SessionPoolExample.java")])]),s._v(" "),t("h3",{attrs:{id:"示例代码"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#示例代码"}},[s._v("#")]),s._v(" 示例代码")]),s._v(" "),t("p",[s._v("浏览上述接口的详细信息，请参阅代码 "),t("code",[s._v("session/src/main/java/org/apache/iotdb/session/Session.java")])]),s._v(" "),t("p",[s._v("使用上述接口的示例代码在 "),t("code",[s._v("example/session/src/main/java/org/apache/iotdb/SessionExample.java")])])])}),[],!1,null,null,null);e.default=i.exports}}]);