update typespecs to fix dialyzer warnings

Author: mmmries

lib/sqlitex.ex

@@ -3,7 +3,7 @@ defmodule Sqlitex do
     @type charlist :: char_list
   end
 
-  @type connection :: {:connection, reference, String.t}
+  @type connection :: {:connection, reference, binary()}
   @type string_or_charlist :: String.t | charlist
   @type sqlite_error :: {:error, {:sqlite_error, charlist}}
 

lib/sqlitex/query.ex

@@ -25,8 +25,8 @@ defmodule Sqlitex.Query do
     @type charlist :: char_list
   end
 
-  @spec query(Sqlitex.connection, String.t | charlist) :: [[]] | Sqlitex.sqlite_error
-  @spec query(Sqlitex.connection, String.t | charlist, [bind: [], into: Enum.t]) :: [Enum.t] | Sqlitex.sqlite_error
+  @spec query(Sqlitex.connection, String.t | charlist) :: {:ok, [[]]} | {:error, term()}
+  @spec query(Sqlitex.connection, String.t | charlist, keyword) :: {:ok, [[]]} | {:error, term()}
   def query(db, sql, opts \\ []) do
     with {:ok, stmt} <- Statement.prepare(db, sql),
          {:ok, stmt} <- Statement.bind_values(stmt, Keyword.get(opts, :bind, [])),
@@ -82,8 +82,8 @@ defmodule Sqlitex.Query do
 
   Returns the results otherwise.
   """
-  @spec query_rows!(Sqlitex.connection, String.t | charlist) :: [[]]
-  @spec query_rows!(Sqlitex.connection, String.t | charlist, [bind: []]) :: [Enum.t]
+  @spec query_rows!(Sqlitex.connection, String.t | charlist) :: %{}
+  @spec query_rows!(Sqlitex.connection, String.t | charlist, [bind: []]) :: %{}
   def query_rows!(db, sql, opts \\ []) do
     case query_rows(db, sql, opts) do
       {:error, reason} -> raise Sqlitex.QueryError, reason: reason

lib/sqlitex/statement.ex

@@ -366,6 +366,7 @@ defmodule Sqlitex.Statement do
     {:ok, _} = db_exec(db, "RELEASE #{sp}")
   end
 
+  @spec db_exec(Sqlitex.connection, iodata()) :: {:ok, [tuple()]}
   defp db_exec(db, sql) do
     case :esqlite3.q(sql, db) do
       {:error, _} = error ->