Raise cx_Oracle.DatabaseError, not IndexError for a scroll operation that

would position the cursor outside of the result set.

doc/cursor.rst

@@ -418,8 +418,8 @@ Cursor Object
    positioned at the first row and if set to "last", the cursor is set to the
    last row in the result set.
 
-   An IndexError is raised if the mode is "relative" or "absolute" and the
-   scroll operation would position the cursor outside of the result set.
+   An error is raised if the mode is "relative" or "absolute" and the scroll
+   operation would position the cursor outside of the result set.
 
    .. versionadded:: development
 

src/Cursor.c

@@ -2197,7 +2197,7 @@ static PyObject *Cursor_Scroll(
     // handle the case when no rows have been retrieved
     if (self->bufferRowCount == 0) {
         if (fetchMode != OCI_FETCH_FIRST && fetchMode != OCI_FETCH_LAST) {
-            PyErr_SetString(PyExc_IndexError,
+            PyErr_SetString(g_DatabaseErrorException,
                     "requested scroll operation would leave result set");
             return NULL;
         }

test/Cursor.py

@@ -254,7 +254,8 @@ class TestCursor(BaseTestCase):
                 select NumberCol
                 from TestNumbers
                 order by IntCol""")
-        self.assertRaises(IndexError, cursor.scroll, 12, "absolute")
+        self.assertRaises(cx_Oracle.DatabaseError, cursor.scroll, 12,
+                "absolute")
 
     def testScrollAbsoluteInBuffer(self):
         """test scrolling absolute (when in buffers)"""
@@ -335,7 +336,7 @@ class TestCursor(BaseTestCase):
                 select NumberCol
                 from TestNumbers
                 order by IntCol""")
-        self.assertRaises(IndexError, cursor.scroll, 15)
+        self.assertRaises(cx_Oracle.DatabaseError, cursor.scroll, 15)
 
     def testScrollRelativeExceptionBefore(self):
         """test scrolling relative yields an exception (before result set)"""
@@ -345,7 +346,7 @@ class TestCursor(BaseTestCase):
                 select NumberCol
                 from TestNumbers
                 order by IntCol""")
-        self.assertRaises(IndexError, cursor.scroll, -5)
+        self.assertRaises(cx_Oracle.DatabaseError, cursor.scroll, -5)
 
     def testScrollRelativeInBuffer(self):
         """test scrolling relative (when in buffers)"""
@@ -389,7 +390,8 @@ class TestCursor(BaseTestCase):
         self.assertEqual(cursor.fetchall(), [])
         cursor.scroll(mode = "first")
         self.assertEqual(cursor.fetchall(), [])
-        self.assertRaises(IndexError, cursor.scroll, 1, mode = "absolute")
+        self.assertRaises(cx_Oracle.DatabaseError, cursor.scroll, 1,
+                mode = "absolute")
 
     def testScrollDifferingArrayAndFetchSizes(self):
         """test scrolling with differing array sizes and fetch array sizes"""