Data commit

Task/Simple-database/Julia/simple-database.julia

@@ -0,0 +1,60 @@
+using CSV, DataFrames, ArgParse, Dates
+
+setting = ArgParseSettings()
+@add_arg_table setting begin
+    "--add"
+        help = "add an entry, within double quotes, comma separated as \"name,birthdate,state,relation,email\" with birthdate as yyyy-mm-dd"
+    "--latest"
+        action = :store_true
+        nargs = 0
+        help = "print latest (last) entry"
+    "--latestfriend"
+        action = :store_true
+        nargs = 0
+        help = "print last friend listed"
+    "--latestfamily"
+        action = :store_true
+        nargs = 0
+        help = "print last family member listed"
+    "--listbyage"
+        action = :store_true
+        nargs = 0
+        help = "print all ages and entries in birth order"
+end
+
+const filename = "example.csv"
+const df = CSV.File(filename, dateformat="yyyy-mm-dd") |> DataFrame
+const commands = parse_args(setting)
+if length(ARGS) == 0
+    ArgParse.show_help(setting)
+end
+const changeflag = [false]
+
+for (k, v) in commands
+    if k == "add" && v != nothing
+        newrow = Vector{Any}(split(v, r","))
+        if length(newrow) == 5 && tryparse(DateTime, newrow[2]) != nothing
+            newrow[2] = DateTime(newrow[2])
+            push!(df, newrow)
+            changeflag[1] = true
+            println("Added entry $newrow.")
+        end
+    elseif k == "latest" && v
+        println("The latest entry is $(df[end, :])")
+    elseif k == "latestfriend" && v
+        println(df[df.Relation .== "friend", :][end, :])
+    elseif k == "latestfamily" && v
+        println(df[df.Relation .== "family", :][end, :])
+    elseif k == "listbyage" && v
+        dobcol = df[:Birthdate]
+        age = map(x -> round((now() - DateTime(x)).value /(1000*3600*24*365.25), digits=1), dobcol)
+        df2 = deepcopy(df)
+        df2 = insert!(df, 1, age, :Age)
+        println(sort(df2, (:Age)))
+    end
+end
+
+if changeflag[1]
+    CSV.write(filename, df)
+    println("Changes written to file $filename.")
+end