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+# 如何在 windows环境下使用jdbc进行TDengine开发应用
+
+本文以windows环境为例,介绍java如何进行TDengine开发应用
+
+## 环境准备
+
+(1)安装jdk
+
+官网下载jdk-1.8,下载页面:https://www.oracle.com/java/technologies/javase/javase-jdk8-downloads.html
+
+安装,配置环境变量,把jdk加入到环境变量里。
+
+命令行内查看java的版本。
+
+```shell
+>java -version
+java version "1.8.0_131"
+Java(TM) SE Runtime Environment (build 1.8.0_131-b11)
+Java HotSpot(TM) 64-Bit Server VM (build 25.131-b11, mixed mode)
+```
+
+
+
+(2)安装配置maven
+
+官网下载maven,下载地址:http://maven.apache.org/download.cgi
+
+配置环境变量MAVEN_HOME,将MAVEN_HOME/bin添加到PATH
+
+命令行里查看maven的版本
+
+```shell
+>mvn --version
+Apache Maven 3.5.0 (ff8f5e7444045639af65f6095c62210b5713f426; 2017-04-04T03:39:06+08:00)
+Maven home: D:\apache-maven-3.5.0\bin\..
+Java version: 1.8.0_131, vendor: Oracle Corporation
+Java home: C:\Program Files\Java\jdk1.8.0_131\jre
+Default locale: zh_CN, platform encoding: GBK
+OS name: "windows 10", version: "10.0", arch: "amd64", family: "windows"
+```
+
+为了加快maven下载依赖的速度,可以为maven配置mirror,修改MAVEN_HOME\config\settings.xml文件
+
+```xml
+
+
+ D:\apache-maven-localRepository
+
+
+
+
+ alimaven
+ aliyun maven
+ http://maven.aliyun.com/nexus/content/groups/public/
+ central
+
+
+
+
+
+
+ jdk-1.8
+
+ true
+ 1.8
+
+
+ 1.8
+ 1.8
+ 1.8
+
+
+
+
+```
+
+
+
+(3)在linux服务器上安装TDengine-server
+
+在taosdata官网下载TDengine-server,下载地址:https://www.taosdata.com/cn/all-downloads/
+
+在linux服务器上安装TDengine-server
+
+```shell
+# tar -zxvf package/TDengine-server-2.0.1.1-Linux-x64.tar.gz
+# cd TDengine-server/
+# ./install.sh
+```
+
+启动taosd
+
+```shell
+# systemctl start taosd
+```
+
+在server上用taos连接taosd
+
+```shell
+# taos
+taos> show dnodes;
+ id | end_point | vnodes | cores | status | role | create_time |
+==================================================================================================================
+ 1 | td01:6030 | 2 | 4 | ready | any | 2020-08-19 18:40:25.045 |
+Query OK, 1 row(s) in set (0.005765s)
+```
+
+如果可以正确连接到taosd实例,并打印出databases的信息,说明TDengine的server已经正确启动。这里查看server的hostname
+
+```shell
+# hostname -f
+td01
+```
+
+注意,如果安装TDengine后,使用默认的taos.cfg配置文件,taosd会使用当前server的hostname创建dnode实例。之后,在client也需要使用这个hostname来连接taosd。
+
+
+
+(4)在windows上安装TDengine-client
+
+在taosdata官网下载taos客户端,下载地址:
+https://www.taosdata.com/cn/all-downloads/
+下载后,双击exe安装。
+
+修改client的hosts文件(C:\Windows\System32\drivers\etc\hosts),将server的hostname和ip配置到client的hosts文件中
+
+```
+192.168.236.136 td01
+```
+
+配置完成后,在命令行内使用taos shell连接server端
+
+```shell
+C:\TDengine>taos
+Welcome to the TDengine shell from Linux, Client Version:2.0.1.1
+Copyright (c) 2017 by TAOS Data, Inc. All rights reserved.
+
+taos> show databases;
+ name | created_time | ntables | vgroups | replica | quorum | days | keep1,keep2,keep(D) | cache(MB) | blocks | minrows | maxrows | wallevel | fsync | comp | precision | status |
+===================================================================================================================================================================================================================================================================
+ test | 2020-08-19 18:43:50.731 | 1 | 1 | 1 | 1 | 2 | 3650,3650,3650 | 16 | 6 | 100 | 4096 | 1 | 3000 | 2 | ms | ready |
+ log | 2020-08-19 18:40:28.064 | 4 | 1 | 1 | 1 | 10 | 30,30,30 | 1 | 3 | 100 | 4096 | 1 | 3000 | 2 | us | ready |
+Query OK, 2 row(s) in set (0.068000s)
+```
+
+如果windows上的client能够正常连接,并打印database信息,说明client可以正常连接server了。
+
+
+
+##应用开发
+
+(1)新建maven工程,在pom.xml中引入taos-jdbcdriver依赖。
+
+```xml
+
+
+ 4.0.0
+
+ com.taosdata.demo
+ JdbcDemo
+ 1.0-SNAPSHOT
+
+
+
+ com.taosdata.jdbc
+ taos-jdbcdriver
+ 2.0.8
+
+
+
+```
+
+(2)使用jdbc查询TDengine数据库
+
+下面是示例代码:
+
+```java
+public class JdbcDemo {
+
+ public static void main(String[] args) throws Exception {
+ Connection conn = getConn();
+ Statement stmt = conn.createStatement();
+ // create database
+ stmt.executeUpdate("create database if not exists db");
+ // use database
+ stmt.executeUpdate("use db");
+ // create table
+ stmt.executeUpdate("create table if not exists tb (ts timestamp, temperature int, humidity float)");
+ // insert data
+ int affectedRows = stmt.executeUpdate("insert into tb values(now, 23, 10.3) (now + 1s, 20, 9.3)");
+ System.out.println("insert " + affectedRows + " rows.");
+ // query data
+ ResultSet resultSet = stmt.executeQuery("select * from tb");
+ Timestamp ts = null;
+ int temperature = 0;
+ float humidity = 0;
+ while(resultSet.next()){
+ ts = resultSet.getTimestamp(1);
+ temperature = resultSet.getInt(2);
+ humidity = resultSet.getFloat("humidity");
+ System.out.printf("%s, %d, %s\n", ts, temperature, humidity);
+ }
+ }
+
+ public static Connection getConn() throws Exception{
+ Class.forName("com.taosdata.jdbc.TSDBDriver");
+ String jdbcUrl = "jdbc:TAOS://td01:0/log?user=root&password=taosdata";
+ Properties connProps = new Properties();
+ connProps.setProperty(TSDBDriver.PROPERTY_KEY_CHARSET, "UTF-8");
+ connProps.setProperty(TSDBDriver.PROPERTY_KEY_LOCALE, "en_US.UTF-8");
+ connProps.setProperty(TSDBDriver.PROPERTY_KEY_TIME_ZONE, "UTC-8");
+ Connection conn = DriverManager.getConnection(jdbcUrl, connProps);
+ return conn;
+ }
+
+}
+```
+
+(3)测试jdbc访问tdengine的sever实例
+
+console输出:
+
+```
+insert 2 rows.
+2020-08-26 00:06:34.575, 23, 10.3
+2020-08-26 00:06:35.575, 20, 9.3
+```
+
+
+
+## 指南
+
+(1)如何设置主机名和hosts
+
+在server上查看hostname和fqdn
+```shell
+查看hostname
+# hostname
+taos-server
+
+查看fqdn
+# hostname -f
+taos-server
+```
+
+windows下hosts文件位于:
+C:\\Windows\System32\drivers\etc\hosts
+修改hosts文件,添加server的ip和hostname
+
+```s
+192.168.56.101 node5
+```
+
+(2)什么是fqdn?
+
+
+> 什么是FQDN?
+>
+> FQDN(Full qualified domain name)全限定域名,fqdn由2部分组成:hostname+domainname。
+>
+> 例如,一个邮件服务器的fqdn可能是:mymail.somecollege.edu,其中mymail是hostname(主机名),somcollege.edu是domainname(域名)。本例中,.edu是顶级域名,.somecollege是二级域名。
+>
+> 当连接服务器时,必须指定fqdn,然后,dns服务器通过查看dns表,将hostname解析为相应的ip地址。如果只指定hostname(不指定domainname),应用程序可能服务解析主机名。因为如果你试图访问不在本地的远程服务器时,本地的dns服务器和可能没有远程服务器的hostname列表。
+>
+> 参考:https://kb.iu.edu/d/aiuv
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