docker搭建mysql环境

2020-11-18
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docker pull mysql
docker run -itd --name mysql -p 3306:3306 -e MYSQL_ROOT_PASSWORD=123456 mysql
docker exec -it mysql bash

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【转】Flask-SQLAlchemy使用方法

2020-10-24
Flask-SQLAlchemy

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Python 使用requests发送Http Get请求

2020-10-24
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import json
import requests

url = "http://localhost:5000/objecttrajactory/lastnminutes/2"
r = requests.get(url)
print(r.status_code)
dataJson = r.json()
print(dataJson)

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no-title

2020-10-19
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SELECT
	object_id,
	ST_AsEWKT ( gps_line ),
	ST_M(ST_EndPoint(gps_line)),
	to_char(to_timestamp(ST_M(ST_EndPoint(gps_line))), 'YYYY-MM-DD HH24:MI:SS')
FROM
	PUBLIC.objecttrajactory

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Centos7 离线安装Docker

2020-10-12
简单二进制安装

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Win7安装Docker

2020-10-12

win7系统下，一开始下载了docker desktop，发现安装失败：
在这里插入图片描述
因为docker desktop要求win10系统，老版本的只能安装docker toolbox。

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scala try-Catch

2020-09-30
scala Try-Catch

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Spark操作hdfs

2020-09-30
遍历hdfs目录

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Spark DataFrame操作

2020-09-30
Spark DataFrame

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Spark WordCount代码

2020-09-30
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/**
 * Hello world!
 *
 */
import org.apache.spark.SparkContext
import org.apache.spark.SparkConf

object WordCount {
   def main(args: Array[String]) {
      val inputFile =  "file:///E://test.txt"
      val conf = new SparkConf().setAppName("WordCount").setMaster("local")
      val sc = new SparkContext(conf)
      val textFile = sc.textFile(inputFile)
      val wordCount = textFile.flatMap(line => line.split(" ")).map(word => (word, 1)).reduceByKey((a, b) => a + b)
      wordCount.foreach(println)
   }
}

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