Performance fix:

Rewrote parameter type checks for text protocol in cpython.

include/mariadb_python.h

@@ -319,6 +319,7 @@ extern PyTypeObject Mariadb_Fieldinfo_Type;
 extern PyTypeObject MrdbConnection_Type;
 extern PyTypeObject MrdbCursor_Type;
 
+PyObject *ListOrTuple_GetItem(PyObject *obj, Py_ssize_t index);
 int Mariadb_traverse(PyObject *self,
     visitproc visit,
     void *arg);

mariadb/cursors.py

@@ -294,11 +294,10 @@ class Cursor(mariadb._mariadb.cursor):
         if self._force_binary:
             self._text = False
 
-        for val in data:
-            if isinstance(val, (bytes, bytearray, datetime.datetime,
-                                datetime.date, datetime.time)):
-                self._text = False
-                break
+        # if one of the provided parameters has byte or datetime value,
+        # we don't use text protocol
+        if self._check_text_types() == True:
+            self._text = False
 
         if self._text:
             # in text mode we need to substitute parameters

mariadb/mariadb_codecs.c

@@ -891,7 +891,7 @@ mariadb_get_column_info(PyObject *obj, MrdbParamInfo *paraminfo)
     return 1;
 }
 
-static PyObject *ListOrTuple_GetItem(PyObject *obj, Py_ssize_t index)
+PyObject *ListOrTuple_GetItem(PyObject *obj, Py_ssize_t index)
 {
     if (CHECK_TYPE(obj, &PyList_Type))
     {

mariadb/mariadb_cursor.c

@@ -19,6 +19,7 @@
 
 #include <mariadb_python.h>
 #include <docs/cursor.h>
+#include <datetime.h>
 
 static void
 MrdbCursor_dealloc(MrdbCursor *self);
@@ -39,6 +40,9 @@ MrdbCursor_InitResultSet(MrdbCursor *self);
 static PyObject *
 MrdbCursor_execute_text(MrdbCursor *self, PyObject *args);
 
+static PyObject *
+MrdbCursor_check_text_types(MrdbCursor *self);
+
 static PyObject *
 MrdbCursor_fetchrows(MrdbCursor *self, PyObject *args);
 
@@ -138,6 +142,9 @@ static PyMethodDef MrdbCursor_Methods[] =
         METH_NOARGS,
         cursor_next__doc__},
     /* internal helper functions */
+    {"_check_text_types", (PyCFunction) MrdbCursor_check_text_types,
+        METH_NOARGS,
+        NULL},
     {"_seek", (PyCFunction)MrdbCursor_seek,
         METH_VARARGS,
         NULL},
@@ -1273,3 +1280,23 @@ MrdbCursor_fetchrows(MrdbCursor *self, PyObject *args)
     return List;
 }
 
+static PyObject *
+MrdbCursor_check_text_types(MrdbCursor *self)
+{
+  PyDateTime_IMPORT;
+
+  if (!self || !self->data || !self->parseinfo.paramcount)
+  {
+    Py_RETURN_NONE;
+  }
+
+  for (uint32_t i= 0; i < self->parseinfo.paramcount; i++)
+  {
+    PyObject *obj= ListOrTuple_GetItem(self->data, i);
+    if (PyBytes_Check(obj) ||
+        PyByteArray_Check(obj) ||
+        PyDate_Check(obj))
+      Py_RETURN_TRUE;
+  }
+  Py_RETURN_NONE;
+}