scalikejdbc 学习笔记

Posted 2020-09-24 AK47Sonic

build.sbt:

import sbt._
import Process._
import Keys._

EclipseKeys.createSrc := EclipseCreateSrc.Default + EclipseCreateSrc.Resource

lazy val commonSettings = Seq(
name := "ScalaLearning",
version := "1.0",
scalaVersion := "2.10.6"
)

lazy val root = (project in file(".")).
  settings(commonSettings: _*).
  settings(
	libraryDependencies ++= Seq(
	  "org.scalikejdbc" %% "scalikejdbc"       % "3.0.0",
	  "mysql" % "mysql-connector-java" % "5.1.40",
	  "ch.qos.logback"  %  "logback-classic"   % "1.2.3",
	  "org.scalariform" %% "scalariform" % "0.1.8"
	  
	)
  )

import scalikejdbc._ 

object SimpleDemo {
  def main(args: Array[String]): Unit = {

    Class.forName("com.mysql.jdbc.Driver")

    val url = "jdbc:mysql://192.168.1.151:3306/scalalearning?useUnicode=true&characterEncoding=UTF8"
    val userName = "root"
    val password = "12345"

    val settings = ConnectionPoolSettings(
      initialSize = 5,
      maxSize = 20,
      connectionTimeoutMillis = 3000L,
      validationQuery = "select 1 from dual")

    ConnectionPool.singleton(url, userName, password, settings)

    case class User(id: Int, name: String, age: Int)

    val allColumns = (rs: WrappedResultSet) => User(
      id = rs.int("id"),
      name = rs.string("name"),
      age = rs.int("age"))

    val users: List[User] = DB readOnly { implicit session =>
      SQL("select * from user limit 10").map(allColumns).list.apply()
    }
    
    for(user <- users) {
      println(user.id + "," + user.name + "," + user.age)
    }

  }
}

运行结果：

  [SQL Execution]
   select * from user limit 10; (2 ms)

  [Stack Trace]
    ...
    com.citi.scalikejdbc.SimpleDemo$$anonfun$2.apply(SimpleDemo.scala:29)
    com.citi.scalikejdbc.SimpleDemo$$anonfun$2.apply(SimpleDemo.scala:28)
    scalikejdbc.DBConnection$class.readOnly(DBConnection.scala:202)
    scalikejdbc.DB.readOnly(DB.scala:60)
    scalikejdbc.DB$$anonfun$readOnly$1.apply(DB.scala:175)
    scalikejdbc.DB$$anonfun$readOnly$1.apply(DB.scala:174)
    scalikejdbc.LoanPattern$class.using(LoanPattern.scala:18)
    scalikejdbc.DB$.using(DB.scala:140)
    scalikejdbc.DB$.readOnly(DB.scala:174)
    com.citi.scalikejdbc.SimpleDemo$.main(SimpleDemo.scala:28)
    com.citi.scalikejdbc.SimpleDemo.main(SimpleDemo.scala)
    ...

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