existsDatabase
Syntax
existsDatabase(path)
Arguments
path is a string indicating the path of a database folder.
Details
Check if a database exists under the specified folder.
Examples
To check if a DFS database exists:
$ n=1000000
$ ID=rand(10, n)
$ dates=2017.08.07..2017.08.11
$ date=rand(dates, n)
$ x=rand(10.0, n)
$ t=table(ID, date, x)
$ db = database("dfs://valueDB", VALUE, 2017.08.07..2017.08.11)
$ pt = db.createPartitionedTable(t, `pt, `date);
$ pt.append!(t);
$ existsDatabase("dfs://valueDB");
1
$ existsDatabase("dfs://valueDB/20170807");
0