https://spark.apache.org/docs/1.5.1/api/java/org/apache/spark/sql/DataFrame.htmlpeople.filter("age > 30").join(department, people("deptId") === department("id")).groupBy(department("name"), "gender").agg(avg(people("salary")), max(people("age")))原文：http://www.cnblogs.com/dataclimber/p/5166915.html
1.功能简述：通过scala代码对Mysql数据库进行JDBC连接
2.源代码import java.sql.{Connection, DriverManager, ResultSet}object Mysql {//定义驱动,数据库地址,名称,密码private val driver="com.mysql.cj.jdbc.Driver" //根据使用的jar包版本进行更改，我用的为高版本private val url="jdbc:mysql://ip:3306/databasename?serverTimezone=UTC" //ip为数据库所在ip，若为本机数据库则是localhost；databasename为要链接的数据库名p...
build><sourceDirectory>src/main/scala</sourceDirectory><testSourceDirectory>src/test/scala</testSourceDirectory><plugins><plugin><groupId>net.alchim31.maven</groupId><artifactId>scala-maven-plugin</artifactId><version>3.2.2</version><executions><execution><goals><goal>compile</goal><goal>testCompile</goal></goals><configuration><args><arg>-dependencyfile</arg><arg>${project.build.directory}/.scala...
Today, I’d like to discuss getting betterMySQL scalability on Amazon RDS.The question of the day:“What can you do when a MySQL database needs to scale write-intensive workloads beyond the capabilities of the largest available machine on Amazon RDS?”Let’s take a look.In a typical EC2/RDS set-up, users connect to app servers from their mobile devices and tablets, computers, browsers, etc. Then ...
"dbtable" -> "crm_order")).load()
val tableDF = sqlContext.jdbc("jdbc:mysql://mysql_hostname:mysql_port/testDF?user=your_username&password=your_password", "user")
//查询mySql数据库 val tableDF = sqlContext.jdbc("jdbc:mysql://10.1.2.190:8066/mq_sale_disc?user=kr.user&password=user@85263382", "tmp_enterprise")
注意：execute、executeUpdate、executeQuery三者区别
查询用executeQuery
插入、更新、删除用ex...
internal.xsltc.compiler.util.IntType
import org.apache.spark.sql.types._
import org.apache.spark.sql.{Row, SparkSession}import org.apache.spark.sql.SQLContext
import org.apache.spark.{SparkConf, SparkContext}
object jdbc {def main(args: Array[String]): Unit = {val conf = new SparkConf().setAppName("JdbcOperation").setMaster("local")val sc = new SparkContext(conf)val sqlContext = new SQLContext(sc)...
步骤：1）MySQL的驱动2）Connection 重量级的获取过程。可以使用POOL优化3）Statement 执行的类4）ResultSet 结果的封装5）Close
在pom中添加scala、hadoop、Mysql驱动依赖包：<properties> <scala.version>2.11.8</scala.version> <hadoop.version>2.6.5</hadoop.version></properties> <dependency> <groupId>org.scala-lang</groupId> <artifactId>scala-library</artifactId> <version>${scala.version}<...
修改级联驱动，scala是Sources，resources是Resources配置文件目录：
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创建配置文件，及文件内容：
?db.default.driver="com.mysql.jdbc.Driver"db.default.url="jdbc:mysql://hadoop001:3306/ruoze_g6"db.default.user="root"db.default.password="123456"
3）代码：package com.ruozeimport scalikejdbc._import scalikejdbc.config._object ScalalikeJdbc{ def main(args:Array[String]):Unit = {
//默认加...
package com.biimport java.sql.{Connection, DriverManager, Timestamp}
import java.util.Calendar/*** Created by xxx on 2017/6/28.*/
object MySqlConn {// for test envval mysqlConfTest = collection.mutable.Map("driver" -> "com.mysql.jdbc.Driver","url" -> "jdbc:mysql://192.168.18.106:3306/rpt","username" -> "test","password" -> "test")// for prod envval mysqlConfProd = collection.mutable.Map("driver" -...
mysqlsqlc# Mysql中int sum=(int)(long)com.ExecuteScalar(); 为什么好先转为long再int？？MySqlCommand com=new MySqlCommand("SELECT COUNT(*) from student",conn);int sum=(int)(long)com.ExecuteScalar();
Hey, it's HighScalability time:Googles new POWER8server motherboard1 trillion: number of scents your nose can smell;millions of square feet: sprawling new server farmsQuotable Quotes:Gideon Lewis-Kraus: As the engineer and writer Alex Payne put it, these startups represent “the field offices of a large distributed workforce assembled by venture capitalists and their associate institutions,” doin...
代码:
import java.sql.DriverManager/*** @date ：2021/3/31 22:28* @author ：xiaotao* @description ：访问mysql中表数据*/
object DataFromMysql {def main(args: Array[String]): Unit = {val conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/wxt?characterEncoding=UTF-8&useSSL=false","root","123456")val statement = conn.prepareStatement("select cid,cname,money,dt from t_result")val set = stat...
我试图使这三个一起工作,但不能.缺少光滑的文档.我有像这样的Typesafe配置的application.conf设置：mysql = {url = "jdbc:mysql://localhost/slickdb"slick.driver=scala.slick.driver.MySQLDriverdriver=com.mysql.cj.jdbc.Driverproperties = {user = rootpassword = null}connectionPool = truekeepAliveConnection = true
}和build.sbt相关的依赖项：libraryDependencies ++= Seq(..."org.eclipse.jetty" % "jetty-webapp" % "...
来自play anorm, create a model from json without passing anorm PK value in the json,我正在尝试将Seq [Address]添加到case类case class User(id: Pk[Long] = NotAssigned,name: String = "",email: String = "",addresses: Seq[Address])地址是具有三个字符串的简单对象/类.一个用户可以有多个地址,如何在findAll中将所有地址与该用户一起获得.def findAll(): Seq[User] = {Logger.info("select * from pt_users")DB.withConn...
我有一个看似简单的问题,并希望有一个简单的解决方案.但我还没有找到它.
我在MySQL中的属性是DATE和TIMESTAMP类型.这些是我的光滑课程：case class Event (id: Long, name: String, category: String, date: Date, venue: String, startTime: Date, endTime: Date, description: String, admission: String, addInfo: Option[String])class Events(tag: Tag) extends Table[Event](tag, "EVENT") {implicit val dateColumnType = M...
