diff --git a/c_src/esqlite3_nif.c b/c_src/esqlite3_nif.c
index d1972bb..081e1c0 100644
--- a/c_src/esqlite3_nif.c
+++ b/c_src/esqlite3_nif.c
@@ -47,33 +47,6 @@ typedef struct {
     sqlite3_backup *backup;
 } esqlite3_backup;
 
-/*
-typedef enum {
-    cmd_unknown,
-    cmd_open,
-    cmd_update_hook_set,
-    cmd_notification,
-    cmd_exec,
-    cmd_changes,
-    cmd_prepare,
-    cmd_bind,
-    cmd_multi_step,
-    cmd_reset,
-    cmd_column_names,
-    cmd_column_types,
-    cmd_backup_init,
-    cmd_backup_step,
-    cmd_backup_remaining,
-    cmd_backup_pagecount,
-    cmd_backup_finish,
-    cmd_close,
-    cmd_stop,
-    cmd_insert,
-    cmd_last_insert_rowid,
-    cmd_get_autocommit,
-} command_type;
-*/
-
 static ERL_NIF_TERM atom_esqlite3;
 
 static ERL_NIF_TERM
@@ -562,74 +535,6 @@ do_reset(ErlNifEnv *env, sqlite3 *db, sqlite3_stmt *stmt)
 }
 */
 
-/*
-static ERL_NIF_TERM
-do_column_names(ErlNifEnv *env, sqlite3_stmt *stmt)
-{
-    int i, size;
-    const char *name;
-    ERL_NIF_TERM *array;
-    ERL_NIF_TERM column_names;
-
-    size = sqlite3_column_count(stmt);
-    if(size == 0)
-        return enif_make_tuple(env, 0);
-    else if(size < 0)
-        return make_error_tuple(env, "invalid_column_count");
-
-    array = (ERL_NIF_TERM *) enif_alloc(sizeof(ERL_NIF_TERM) * size);
-    if(!array)
-        return make_error_tuple(env, "no_memory");
-
-    for(i = 0; i < size; i++) {
-        name = sqlite3_column_name(stmt, i);
-        if(name == NULL) {
-            enif_free(array);
-            return make_error_tuple(env, "sqlite3_malloc_failure");
-        }
-
-        array[i] = make_atom(env, name);
-    }
-
-    column_names = enif_make_tuple_from_array(env, array, size);
-    enif_free(array);
-    return column_names;
-}
-*/
-
-/*
-static ERL_NIF_TERM
-do_column_types(ErlNifEnv *env, sqlite3_stmt *stmt)
-{
-    int i, size;
-    const char *type;
-    ERL_NIF_TERM *array;
-    ERL_NIF_TERM column_types;
-
-    size = sqlite3_column_count(stmt);
-    if(size == 0)
-        return enif_make_tuple(env, 0);
-    else if(size < 0)
-        return make_error_tuple(env, "invalid_column_count");
-
-    array = (ERL_NIF_TERM *) enif_alloc(sizeof(ERL_NIF_TERM) * size);
-    if(!array)
-        return make_error_tuple(env, "no_memory");
-
-    for(i = 0; i < size; i++) {
-        type = sqlite3_column_decltype(stmt, i);
-        if(type == NULL) {
-	    type = "nil";
-        }
-
-        array[i] = make_atom(env, type);
-    }
-
-    column_types = enif_make_tuple_from_array(env, array, size);
-    enif_free(array);
-    return column_types;
-}
-*/
 
 /*
 static ERL_NIF_TERM
@@ -833,6 +738,9 @@ esqlite_open(ErlNifEnv *env, int argc, const ERL_NIF_TERM argv[])
 
     /* Set a standard busy timeout of 2 seconds */
     sqlite3_busy_timeout(conn->db, 2000);
+
+    /* Turn on extended error codes for better error reporting */
+    sqlite3_extended_result_codes(conn->db, 1);
     
     ERL_NIF_TERM  db_conn = enif_make_resource(env, conn);
     enif_release_resource(conn);
@@ -1254,42 +1162,84 @@ esqlite_column_names(ErlNifEnv *env, int argc, const ERL_NIF_TERM argv[])
 }
 
 /*
- * Get the column types of the prepared statement.
-static ERL_NIF_TERM
-esqlite_column_types(ErlNifEnv *env, int argc, const ERL_NIF_TERM argv[])
-{
-    esqlite3 *conn;
-    esqlite3_stmt *stmt;
-    esqlite_command *cmd = NULL;
-    ErlNifPid pid;
-
-    if(argc != 4)
-        return enif_make_badarg(env);
-
-    if(!enif_get_resource(env, argv[0], esqlite3_type, (void **) &conn))
-        return enif_make_badarg(env);
-    if(!enif_get_resource(env, argv[1], esqlite3_stmt_type, (void **) &stmt))
-        return enif_make_badarg(env);
-    if(!enif_is_ref(env, argv[2]))
-        return make_error_tuple(env, "invalid_ref");
-    if(!enif_get_local_pid(env, argv[3], &pid))
-        return make_error_tuple(env, "invalid_pid");
-
-    if(!stmt->statement)
-        return make_error_tuple(env, "no_prepared_statement");
-
-    cmd = command_create();
-    if(!cmd)
-        return make_error_tuple(env, "command_create_failed");
-
-    cmd->type = cmd_column_types;
-    cmd->ref = enif_make_copy(cmd->env, argv[2]);
-    cmd->pid = pid;
-    cmd->stmt = enif_make_copy(cmd->env, argv[1]);
-
-    return push_command(env, conn, cmd);
-}
+ * Get the column's declared datatypes of a statement.
  */
+static ERL_NIF_TERM
+esqlite_column_decltypes(ErlNifEnv *env, int argc, const ERL_NIF_TERM argv[])
+{
+    esqlite3_stmt *stmt;
+
+    if(argc != 1) {
+        return enif_make_badarg(env);
+    }
+
+    if(!enif_get_resource(env, argv[0], esqlite3_stmt_type, (void **) &stmt)) {
+        return enif_make_badarg(env);
+    }
+
+    if(!stmt->statement) {
+        return enif_raise_exception(env, make_atom(env, "no_prepared_statement"));   
+    }
+
+    ERL_NIF_TERM column_types = enif_make_list(env, 0);
+
+    int size = sqlite3_column_count(stmt->statement);
+    if(size < 0) {
+        return enif_raise_exception(env, make_atom(env, "invalid_column_count"));   
+    }
+
+    for(int i=size; i-- > 0; ) {
+        ERL_NIF_TERM type_name;
+
+        const char *type = sqlite3_column_decltype(stmt->statement, i);
+
+        if(type == NULL) {
+            type_name = make_atom(env, "undefined");
+        } else {
+            type_name = make_binary(env, type, strlen(type));
+        }
+
+        column_types = enif_make_list_cell(env, type_name, column_types);
+    }
+
+    return column_types;
+}
+
+static ERL_NIF_TERM
+esqlite_bind_int(ErlNifEnv *env, int argc, const ERL_NIF_TERM argv[])
+{
+    esqlite3_stmt *stmt;
+    int index;
+    int value;
+
+    if(argc != 3) {
+        return enif_make_badarg(env);
+    }
+
+    if(!enif_get_resource(env, argv[0], esqlite3_stmt_type, (void **) &stmt)) {
+        return enif_make_badarg(env);
+    }
+
+    if(!stmt->statement) {
+        return enif_raise_exception(env, make_atom(env, "no_prepared_statement"));   
+    }
+
+    if(!enif_get_int(env, argv[1], &index)) {
+        return enif_make_badarg(env);
+    }
+
+    if(!enif_get_int(env, argv[2], &value)) {
+        return enif_make_badarg(env);
+    }
+
+    int rc = sqlite3_bind_int(stmt->statement, index, value);
+    if(rc != SQLITE_OK) {
+        return make_sqlite3_error_tuple(env, rc, conn->db);
+    }
+
+    return make_atom(env, ok);
+}
+
 
 /*
  * Backup functions
@@ -1536,7 +1486,16 @@ static ErlNifFunc nif_funcs[] = {
     {"prepare", 2, esqlite_prepare},
 
     {"column_names", 1, esqlite_column_names},
-    // {"column_types", 1, esqlite_column_types},
+    {"column_decltypes", 1, esqlite_column_decltypes},
+    
+    {"bind_int", 3, esqlite_bind_int},
+    /*
+    {"bind_int64", 3, esqlite_bind_blob},
+    {"bind_double", 3, esqlite_bind_blob},
+    {"bind_text", 3, esqlite_bind_blob},
+    {"bind_blob", 3, esqlite_bind_blob},
+    {"bind_null", 2, esqlite_bind_blob},
+    */
 
     {"interrupt", 1, esqlite_interrupt, ERL_NIF_DIRTY_JOB_IO_BOUND}
 
diff --git a/rebar.config.script b/rebar.config.script
index acbf198..d997ecb 100644
--- a/rebar.config.script
+++ b/rebar.config.script
@@ -23,7 +23,7 @@ CFlags =
     end.
 
 [
-    {minimum_otp_vsn, "21.0"},
+    {minimum_otp_vsn, "22.0"},
 
     {erl_opts, [debug_info, warnings_as_errors]},
 
diff --git a/src/esqlite3.erl b/src/esqlite3.erl
index 629750c..20388ca 100644
--- a/src/esqlite3.erl
+++ b/src/esqlite3.erl
@@ -22,7 +22,8 @@
     open/1, close/1,
     prepare/2,
 
-    column_names/1
+    column_names/1,
+    column_decltypes/1
 
 %    set_update_hook/2, set_update_hook/3,
 %    exec/2, exec/3, exec/4,
@@ -448,21 +449,20 @@ prepare(#esqlite3{db=Connection}, Sql) ->
 %
 %% @doc Return the column names of the prepared statement.
 %%
--spec column_names(esqlite3_stmt()) -> [binary()].
+-spec column_names(Statement) -> Names
+    when Statement :: esqlite3_stmt(),
+         Names :: list(binary()).
 column_names(#esqlite3_stmt{stmt=Stmt}) ->
      esqlite3_nif:column_names(Stmt).
 
 %% @doc Return the column types of the prepared statement.
 %%
-%-spec column_types(statement()) -> {atom()}.
-%column_types(Statement) ->
-%    column_types(Statement, ?DEFAULT_TIMEOUT).
+-spec column_decltypes(Statement) -> Types
+      when Statement :: esqlite3_stmt(),
+           Types :: list(binary() | undefined).
+column_decltypes(#esqlite3_stmt{stmt=Stmt}) ->
+    esqlite3_nif:column_decltypes(Stmt).
 
-%-spec column_types(statement(), timeout()) -> {atom()}.
-%column_types(#statement{raw_statement=RawStatement, raw_connection=RawConnection}, Timeout) ->
-%    Ref = make_ref(),
-%    ok = esqlite3_nif:column_types(RawConnection, RawStatement, Ref, self()),
-%    receive_answer(RawConnection, Ref, Timeout).
 
 %% @doc make multiple sqlite steps per call return rows in reverse order
 %%
diff --git a/src/esqlite3_nif.erl b/src/esqlite3_nif.erl
index 2498a24..b4ec869 100644
--- a/src/esqlite3_nif.erl
+++ b/src/esqlite3_nif.erl
@@ -25,6 +25,7 @@
     prepare/2,
 
     column_names/1,
+    column_decltypes/1,
 
     interrupt/1
 %    set_update_hook/4,
@@ -141,15 +142,16 @@ prepare(_Connection, _Sql) ->
 
 %% @doc Retrieve the column names of the prepared statement
 %%
--spec column_names(esqlite3_stmt()) -> list() | {error, _}.
+-spec column_names(esqlite3_stmt()) -> list(binary()) | {error, _}.
 column_names(_Stmt) ->
     erlang:nif_error(nif_library_not_loaded).
 
-%% @doc Retrieve the column types of the prepared statement
+%% @doc Retrieve the declared datatypes of all columns.
 %%
-%-spec column_types(esqlite3(), esqlite3_stmt(), reference(), pid()) -> ok | {error, _}.
-%column_types(_Db, _Stmt, _Ref, _Dest) ->
-%    erlang:nif_error(nif_library_not_loaded).
+-spec column_decltypes(esqlite3_stmt()) -> list(undefined | binary()) | {error, _}.
+column_decltypes(_Stmt) ->
+    erlang:nif_error(nif_library_not_loaded).
+
 
 %% @doc Initialize a backup procedure of a database.
 %-spec backup_init(esqlite3(), string(), esqlite3_stmt(), string(), reference(), pid()) -> ok | {error, _}.
diff --git a/test/esqlite_test.erl b/test/esqlite_test.erl
index 523d5cc..2adb3dc 100644
--- a/test/esqlite_test.erl
+++ b/test/esqlite_test.erl
@@ -44,7 +44,7 @@ prepare_test() ->
 
 prepare_after_close_test() ->
     {ok, C} = esqlite3:open(":memory:"),
-    ok = esqlite3:close(C),
+    ?assertEqual(ok, esqlite3:close(C)),
     ?assertMatch({error, {misuse, _}}, esqlite3:prepare(C, "select 1")),
     ok.
 
@@ -65,6 +65,16 @@ column_names_test() ->
 
     ok.
 
+column_decltypes_test() ->
+    {ok, C} = esqlite3:open(":memory:"),
+
+    {ok, Stmt} = esqlite3:prepare(C, "select 1, 2, 3"),
+
+    ?assertEqual([undefined, undefined, undefined], esqlite3:column_decltypes(Stmt)),
+
+    %% Need to be able to define tables.
+
+    ok.
 
 
 %iodata_test() ->
@@ -77,6 +87,8 @@ column_names_test() ->
 open_multiple_same_databases_test() ->
     cleanup(),
 
+    %% Sqlite allows opening the same file multiple
+    %% times
     {ok, _C1} = esqlite3:open(?DB1),
     {ok, _C2} = esqlite3:open(?DB1),