pass executemany context to _repr_params

Fixed bug where parameter repr as used in logging and error reporting needs
additional context in order to distinguish between a list of parameters for
a single statement and a list of parameter lists, as the "list of lists"
structure could also indicate a single parameter list where the first
parameter itself is a list, such as for an array parameter.   The
engine/connection now passes in an additional boolean indicating how the
parameters should be considered.  The only SQLAlchemy backend that expects
arrays as parameters is that of  psycopg2 which uses pyformat parameters,
so this issue has not been too apparent, however as other drivers that use
positional gain more features it is important that this be supported. It
also eliminates the need for the parameter repr function to guess based on
the parameter structure passed.

Fixes: #4902
Change-Id: I086246ee0eb51484adbefd83e07295fa56576c5f

1 files changed, 9 insertions, 11 deletions

diff --git a/lib/sqlalchemy/sql/util.py b/lib/sqlalchemy/sql/util.py
index 5aeed0c1c..e109852a2 100644
--- a/lib/sqlalchemy/sql/util.py
+++ b/lib/sqlalchemy/sql/util.py
@@ -464,31 +464,29 @@ class _repr_params(_repr_base):
 
     """
 
-    __slots__ = "params", "batches"
+    __slots__ = "params", "batches", "ismulti"
 
-    def __init__(self, params, batches, max_chars=300):
+    def __init__(self, params, batches, max_chars=300, ismulti=None):
         self.params = params
+        self.ismulti = ismulti
         self.batches = batches
         self.max_chars = max_chars
 
     def __repr__(self):
+        if self.ismulti is None:
+            return self.trunc(self.params)
+
         if isinstance(self.params, list):
             typ = self._LIST
-            ismulti = self.params and isinstance(
-                self.params[0], (list, dict, tuple)
-            )
+
         elif isinstance(self.params, tuple):
             typ = self._TUPLE
-            ismulti = self.params and isinstance(
-                self.params[0], (list, dict, tuple)
-            )
         elif isinstance(self.params, dict):
             typ = self._DICT
-            ismulti = False
         else:
             return self.trunc(self.params)
 
-        if ismulti and len(self.params) > self.batches:
+        if self.ismulti and len(self.params) > self.batches:
             msg = " ... displaying %i of %i total bound parameter sets ... "
             return " ".join(
                 (
@@ -499,7 +497,7 @@ class _repr_params(_repr_base):
                     self._repr_multi(self.params[-2:], typ)[1:],
                 )
             )
-        elif ismulti:
+        elif self.ismulti:
             return self._repr_multi(self.params, typ)
         else:
             return self._repr_params(self.params, typ)