Scalalikejdbc隐式参数

尝试理解Scala中的以下语法（隐式会话）：

def getDates(date: String): Option[String] = DB.readOnly { implicit session =>
 val date = "20201020"
}

使用scalalikejdbc中的readOnly方法。方法的定义为：

def readOnly[A](execution: DBSession => A)(implicit context: CPContext = NoCPContext, settings: SettingsProvider = SettingsProvider.default): A = {
  val cp = connectionPool(context)
  using(cp.borrow()) { conn =>
    DB(conn, cp.connectionAttributes, settings).autoClose(false).readOnly(execution)
  }
} 

---

例如，这意味着

会话

在整个会话的隐式范围内

trait Foo
val foo = new Foo {}
def g(implicit foo: Foo) = ???
val f: Foo => String = implicit foo => {
  // foo is in implicit scope in the method body
  g // foo argument passed in to g implicitly 
}

---

例如，这意味着

会话

在整个会话的隐式范围内

trait Foo
val foo = new Foo {}
def g(implicit foo: Foo) = ???
val f: Foo => String = implicit foo => {
  // foo is in implicit scope in the method body
  g // foo argument passed in to g implicitly 
}