Add tagged parameters to encode.

lib/mariaex/query.ex

@@ -97,6 +97,10 @@ defimpl DBConnection.Query, for: Mariaex.Query do
 
   defp encode_param(nil, _binary_as),
     do: {1, :field_type_null, ""}
+  defp encode_param(%Mariaex.TypedValue{type: :binary, value: bin}, _binary_as) when is_binary(bin),
+    do: encode_param(bin, :field_type_blob)
+  defp encode_param(%Mariaex.TypedValue{type: :string, value: bin}, _binary_as) when is_binary(bin),
+    do: encode_param(bin, :field_type_var_string)
   defp encode_param(bin, binary_as) when is_binary(bin),
     do: {0, binary_as, << to_length_encoded_integer(byte_size(bin)) :: binary, bin :: binary >>}
   defp encode_param(int, _binary_as) when is_integer(int),

lib/mariaex/structs.ex

@@ -39,3 +39,8 @@ defmodule Mariaex.Cursor do
   @moduledoc false
   defstruct [:ref, :statement_id, :params, max_rows: 0]
 end
+
+defmodule Mariaex.TypedValue do
+  @moduledoc false
+  defstruct [:type, :value]
+end

test/query_test.exs

@@ -94,6 +94,24 @@ defmodule QueryTest do
     assert query("SELECT active, tiny from #{table} WHERE id = ?", [2]) == [[1, 0]]
   end
 
+  test "tagged binary and string tests", context do
+    table = "tagged_test"
+    binary = 15..0 |> Enum.into([]) |> IO.iodata_to_binary()
+    string = "☀☁☂☃☄★☆☇☈☉☊☋☌☍☎☏"
+
+    :ok = query("CREATE TABLE #{table} (id serial, bin binary(16), str varchar(16))", [])
+
+    :ok = query(~s{INSERT INTO #{table} (id, bin, str) VALUES (?, ?, ?)},
+                [1, %Mariaex.TypedValue{type: :binary, value: binary},
+                 %Mariaex.TypedValue{type: :string, value: string}])
+
+    assert query("SELECT bin, str from #{table} WHERE id = ?", [1]) == [[binary, string]]
+
+    assert query("SELECT bin, str from #{table} WHERE id = ? AND bin = ? AND str = ?",
+                 [1, %Mariaex.TypedValue{type: :binary, value: binary},
+                  %Mariaex.TypedValue{type: :string, value: string}]) == [[binary, string]]
+  end
+
   test "support numeric data types using prepared statements", context do
     integer = 16
     float   = 0.1