Print out all the data within a TableQuery[Restaurants] - scala

Question

def displayTable(table: TableQuery[Restaurants]): Unit = {
val tablequery = table.map(_.id)
val action = tablequery.result
val result = db.run(action)
result.foreach(id => id.foreach(new_id => println(new_id)))
total_points = total_points + 10
}
I have tried to print out all the data to the screen but I have gotten no where. My question is why does nothing print out. I am using Scala and JDBC connection aka Slick. If you remove new_id => println(new_id), you get:
def displayTable(table: TableQuery[Restaurants]): Unit = {
val tablequery = table.map(_.id)
val action = tablequery.result
val result = db.run(action)
result.foreach(id => println(id))
total_points = total_points + 10
}
This code produces an out put like the following: "Vector()". Can someone please help me print out all the data out? I loaded it in using the following code:
def fillTable(): TableQuery[Restaurants] ={
println("Table filled.")
val restaurants = TableQuery[Restaurants]
val setup = DBIO.seq(
restaurants.schema.create
)
val setupFuture = db.run(setup)
val bufferedSource = io.Source.fromFile("src/main/scala/Restaurants.csv")
for (line <- bufferedSource.getLines) {
val cols = line.split(",").map(_.trim)
var restaurant = new Restaurant(s"${cols(0)}",s"${cols(1)}", s"${cols(2)}",
s"${cols(3)}", s"${cols(4)}",s"${cols(5)}",s"${cols(6)}",
s"${cols(7)}",s"${cols(8)}",s"${cols(9)}")
restaurants.forceInsert(s"${cols(0)}",s"${cols(1)}", s"${cols(2)}",
s"${cols(3)}", s"${cols(4)}",s"${cols(5)}",s"${cols(6)}",
s"${cols(7)}",s"${cols(8)}",s"${cols(9)}")
total_rows = total_rows + 1
This is my first question so I apologize for the format.

Answer 1

The fact that Vector() is your output in the second version of displayTable is a strong hint that your query is returning an empty result, and therefore has no id's to print out. I haven't run your code myself, but I suspect this is because restaurants.forceInsert returns an action, and you need to db.run() it to actually execute the query.
I'm also curious why you create var restaurant = ... but then ignore it, and call forceInsert recreating the tuple from the csv values again. Why not restaurants.forceInsert(restaurant)?