Add API for static strings, primarily good for identifiers.
Thanks to Konrad Schöbel and Jasper Schulz for helping with the mass-editing.
diff --git a/Modules/_sqlite/connection.c b/Modules/_sqlite/connection.c
index 310a27c..c2f218f 100644
--- a/Modules/_sqlite/connection.c
+++ b/Modules/_sqlite/connection.c
@@ -675,6 +675,7 @@
 {
     PyObject* function_result = NULL;
     PyObject** aggregate_instance;
+    _Py_identifier(finalize);
 
 #ifdef WITH_THREAD
     PyGILState_STATE threadstate;
@@ -690,7 +691,7 @@
         goto error;
     }
 
-    function_result = PyObject_CallMethod(*aggregate_instance, "finalize", "");
+    function_result = _PyObject_CallMethodId(*aggregate_instance, &PyId_finalize, "");
     if (!function_result) {
         if (_enable_callback_tracebacks) {
             PyErr_Print();
@@ -1230,8 +1231,9 @@
     PyObject* cursor = 0;
     PyObject* result = 0;
     PyObject* method = 0;
+    _Py_identifier(cursor);
 
-    cursor = PyObject_CallMethod((PyObject*)self, "cursor", "");
+    cursor = _PyObject_CallMethodId((PyObject*)self, &PyId_cursor, "");
     if (!cursor) {
         goto error;
     }
@@ -1259,8 +1261,9 @@
     PyObject* cursor = 0;
     PyObject* result = 0;
     PyObject* method = 0;
+    _Py_identifier(cursor);
 
-    cursor = PyObject_CallMethod((PyObject*)self, "cursor", "");
+    cursor = _PyObject_CallMethodId((PyObject*)self, &PyId_cursor, "");
     if (!cursor) {
         goto error;
     }
@@ -1288,8 +1291,9 @@
     PyObject* cursor = 0;
     PyObject* result = 0;
     PyObject* method = 0;
+    _Py_identifier(cursor);
 
-    cursor = PyObject_CallMethod((PyObject*)self, "cursor", "");
+    cursor = _PyObject_CallMethodId((PyObject*)self, &PyId_cursor, "");
     if (!cursor) {
         goto error;
     }
@@ -1437,6 +1441,7 @@
     PyObject* name;
     PyObject* retval;
     Py_ssize_t i, len;
+    _Py_identifier(upper);
     char *uppercase_name_str;
     int rc;
     unsigned int kind;
@@ -1450,7 +1455,7 @@
         goto finally;
     }
 
-    uppercase_name = PyObject_CallMethod(name, "upper", "");
+    uppercase_name = _PyObject_CallMethodId(name, &PyId_upper, "");
     if (!uppercase_name) {
         goto finally;
     }