Question

How can I get a single row result (e.g. in form of a table/array) back from a sql statement. Using Lua Sqlite (LuaSQLite3). For example this one:

SELECT * FROM sqlite_master WHERE name ='myTable';

So far I note:

• using “nrows”/”rows” it gives an iterator back
• using “exec” it doesn’t seem to give a result back(?)

Specific questions are then:

Q1 – How to get a single row (say first row) result back?

Q2 – How to get row count? (e.g. num_rows_returned = db:XXXX(sql))

Answer 1

Here is a demo of getting the returned count:

> require "lsqlite3"
> db = sqlite3.open":memory:"
> db:exec "create table foo (x,y,z);"
> for x in db:urows "select count(*) from foo" do print(x) end
0
> db:exec "insert into foo values (10,11,12);"
> for x in db:urows "select count(*) from foo" do print(x) end
1
>