object DbUtil {
def dbPassword(hostname:String, port:String, database:String, username:String ):String = {
// Usage: val thatPassWord = dbPassword(hostname,port,database,username)
// .pgpass file format, hostname:port:database:username:password
val passwdFile = new java.io.File(scala.sys.env("HOME"), ".pgpass")
var passwd = ""
val fileSrc = scala.io.Source.fromFile(passwdFile)
fileSrc.getLines.foreach{line =>
val connCfg = line.split(":")
if (hostname == connCfg(0)
&& port == connCfg(1)
&& database == connCfg(2)
&& username == connCfg(3)
) {
passwd = connCfg(4)
}
}
fileSrc.close
passwd
}
def passwordFromConn(connStr:String) = {
// Usage: passwordFromConn("hostname:port:database:username")
val connCfg = connStr.split(":")
dbPassword(connCfg(0),connCfg(1),connCfg(2),connCfg(3))
}
}
Thoughts.
* foreach v.s. map().filter()(0) . e.g.: List(1,2,3).filter(_ > 0)(0)
* var passwd, v.s. val passwd inside of foreach.
* is it good to do chain of method style?
* how to break when find one, in a for loop ?
import util.control.Breaks._
breakable {
for (i <- 1 to 10) {
println(i)
if (i > 4) break // break out of the for loop }
}
* other improvement ?
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