Akka Typed是一種新的Actor模型庫，它提供了更高級的類型安全性和更好的可讀性。MySQL是一個關(guān)系型數(shù)據(jù)庫管理系統(tǒng)，廣泛應(yīng)用于Web應(yīng)用程序和企業(yè)級應(yīng)用程序中。在本文中，我們將介紹如何使用Akka Typed連接MySQL，為您的應(yīng)用程序提供可靠的數(shù)據(jù)庫支持。

import akka.actor.typed.{ActorSystem, Behavior}
import akka.actor.typed.scaladsl.Behaviors
import akka.persistence.typed.scaladsl.{Effect, EventSourcedBehavior}
import com.typesafe.config.ConfigFactory
import scala.reflect.ClassTag
object MySql {
//定義數(shù)據(jù)庫地址和用戶名密碼
private val url = "jdbc:mysql://localhost:3306/test"
private val username = "root"
private val password = "12345"
//初始化MySQL連接
private val connection = java.sql.DriverManager.getConnection(url, username, password)
//定義SQL執(zhí)行函數(shù)
def executeSql[T: ClassTag](sql: String, f: java.sql.ResultSet =>T): Seq[T] = {
var list = Seq.empty[T]
val statement = connection.createStatement()
val result = statement.executeQuery(sql)
while (result.next()) {
list = list :+ f(result)
}
statement.close()
list
}
//關(guān)閉MySQL連接
def close(): Unit = {
connection.close()
}
}
object User {
//定義用戶Actor
sealed trait Command
case class GetUser(userId: Long) extends Command
case class AddUser(userId: Long, userName: String, age: Int) extends Command
//定義用戶狀態(tài)
case class UserState(userName: String, age: Int)
//定義事件
sealed trait Event
case class UserAdded(userId: Long, userName: String, age: Int) extends Event
//定義初始狀態(tài)
val emptyUserState = UserState("", 0)
//定義Actor行為
def behavior(userId: Long): Behavior[Command] = {
EventSourcedBehavior[Command, Event, UserState](
persistenceId = s"user-$userId",
emptyState = emptyUserState,
commandHandler = (state, command) =>{
command match {
case GetUser(_) =>Effect.none.thenReply(state =>state)
case AddUser(_, userName, age) =>Effect.persist(UserAdded(userId, userName, age)).thenReply(state =>state)
}
},
eventHandler = (state, event) =>{
event match {
case UserAdded(_, userName, age) =>UserState(userName, age)
}
}
)
}
}
object Main {
//定義主函數(shù)
def main(args: Array[String]): Unit = {
val config = ConfigFactory.load()
val system = ActorSystem(Behaviors.empty, "akka-typed-mysql", config)
//執(zhí)行SQL
val result = MySql.executeSql("select * from user", result =>result.getLong("user_id"))
result.foreach(userId =>{
val userActor = system.systemActorOf(User.behavior(userId), s"user-$userId")
userActor ! User.GetUser(userId)
})
//關(guān)閉MySQL連接
MySql.close()
//等待所有Actor完成
Thread.sleep(1000)
system.terminate()
}
}

在上面的代碼中，我們首先定義了一個名為MySql的對象，其中包含初始化數(shù)據(jù)庫連接、執(zhí)行SQL和關(guān)閉數(shù)據(jù)庫連接的函數(shù)。在User對象中，我們定義了一個名為User的Actor，它可以響應(yīng)獲取用戶和添加用戶的命令，并在事件中持久化到MySQL數(shù)據(jù)庫中。在Main對象的主函數(shù)中，我們從MySQL數(shù)據(jù)庫中獲取所有用戶ID，并創(chuàng)建一個名為user-id的Actor，分別以每個用戶ID為參數(shù)。最后，我們等待所有Actor完成，然后關(guān)閉MySQL連接和Actor系統(tǒng)。