Handle executemany incomplete iteration

Author: rogerbinns

apsw/tests/__main__.py

@@ -1010,6 +1010,20 @@ def myvals():
         # incomplete execution across executemany
         c.executemany("select * from foo; select ?", ((1,), (2,)))  # we don't read
         self.assertRaises(apsw.IncompleteExecutionError, c.executemany, "begin", (1, 2))
+        # this gets more complicated - if executemany doesn't consume the iterable
+        # and another execute is started, we also consider that incomplete
+        c.executemany("select ?", ((i,) for i in range(10)))
+        self.assertRaisesRegex(
+            apsw.IncompleteExecutionError, ".*executemany were not fully consumed.*", c.execute, "select 3"
+        )
+        c.executemany("select ?", ((i,) for i in range(10)))
+        self.assertRaisesRegex(
+            apsw.IncompleteExecutionError,
+            ".*executemany were not fully consumed.*",
+            c.executemany,
+            "select ?",
+            ((i,) for i in range(10)),
+        )
 
         # set type (pysqlite error with this)
         c.execute("create table xxset(x,y,z)")

src/cursor.c

@@ -183,6 +183,8 @@ resetcursor(APSWCursor *self, int force)
     if (next)
     {
       Py_DECREF(next);
+      if(!PyErr_Occurred())
+        PyErr_Format(ExcIncomplete, "Error: The values for executemany were not fully consumed");
       res = SQLITE_ERROR;
       assert(PyErr_Occurred());
     }