Add last_insert_rowid method (#177)

Author: nkottary

src/SQLite.jl

@@ -422,4 +422,11 @@ returns a list of columns in `table`
 """
 columns(db::DB, table::AbstractString, sink=DataFrame) = Query(db, "PRAGMA table_info($(esc_id(table)))") |> sink
 
-end # module
+"""
+`SQLite.last_insert_rowid(db)`
+
+returns the auto increment id of the last row
+"""
+last_insert_rowid(db::DB) = sqlite3_last_insert_rowid(db.handle)
+
+end # module

src/api.jl

@@ -458,4 +458,10 @@ function sqlite3_close_v2(handle::Ptr{Cvoid})
         warn("sqlite3_close_v2 not available.")
         sqlite3_close(handle)
     end
-end
+end
+function sqlite3_last_insert_rowid(handle::Ptr{Cvoid})
+    @NULLCHECK handle
+    return ccall( (:sqlite3_last_insert_rowid, libsqlite),
+        Clong, (Ptr{Cvoid},),
+        handle)
+end