7 files changed, 38 insertions, 13 deletions
diff --git a/django/core/db/__init__.py b/django/core/db/__init__.py
index c4f06e4c6e..6636d4f176 100644
--- a/django/core/db/__init__.py
+++ b/django/core/db/__init__.py
@@ -1,16 +1,11 @@
 """
 This is the core database connection.
 
-All CMS code assumes database SELECT statements cast the resulting values as such:
+All Django code assumes database SELECT statements cast the resulting values as such:
     * booleans are mapped to Python booleans
     * dates are mapped to Python datetime.date objects
     * times are mapped to Python datetime.time objects
     * timestamps are mapped to Python datetime.datetime objects
-
-Right now, we're handling this by using psycopg's custom typecast definitions.
-If we move to a different database module, we should ensure that it either
-performs the appropriate typecasting out of the box, or that it has hooks that
-let us do that.
 """
 
 from django.conf.settings import DATABASE_ENGINE
@@ -41,6 +36,7 @@ get_limit_offset_sql = dbmod.get_limit_offset_sql
 get_random_function_sql = dbmod.get_random_function_sql
 get_table_list = dbmod.get_table_list
 get_relations = dbmod.get_relations
+quote_name = dbmod.quote_name
 OPERATOR_MAPPING = dbmod.OPERATOR_MAPPING
 DATA_TYPES = dbmod.DATA_TYPES
 DATA_TYPES_REVERSE = dbmod.DATA_TYPES_REVERSE
diff --git a/django/core/db/backends/ado_mssql.py b/django/core/db/backends/ado_mssql.py
index 9ea0d5456d..a673c4812e 100644
--- a/django/core/db/backends/ado_mssql.py
+++ b/django/core/db/backends/ado_mssql.py
@@ -110,6 +110,10 @@ def get_table_list(cursor):
 def get_relations(cursor, table_name):
     raise NotImplementedError
 
+def quote_name(name):
+    # TODO: Figure out how MS-SQL quotes database identifiers.
+    return name
+
 OPERATOR_MAPPING = {
     'exact': '=',
     'iexact': 'LIKE',
diff --git a/django/core/db/backends/mysql.py b/django/core/db/backends/mysql.py
index 4399b6a6a0..e7ede84a12 100644
--- a/django/core/db/backends/mysql.py
+++ b/django/core/db/backends/mysql.py
@@ -122,18 +122,23 @@ def get_table_list(cursor):
 def get_relations(cursor, table_name):
     raise NotImplementedError
 
+def quote_name(name):
+    if name.startswith("`") and name.endswith("`"):
+        return name # Quoting once is enough.
+    return "`%s`" % name
+
 OPERATOR_MAPPING = {
     'exact': '=',
     'iexact': 'LIKE',
-    'contains': 'LIKE',
+    'contains': 'LIKE BINARY',
     'icontains': 'LIKE',
     'ne': '!=',
     'gt': '>',
     'gte': '>=',
     'lt': '<',
     'lte': '<=',
-    'startswith': 'LIKE',
-    'endswith': 'LIKE',
+    'startswith': 'LIKE BINARY',
+    'endswith': 'LIKE BINARY',
     'istartswith': 'LIKE',
     'iendswith': 'LIKE',
 }
diff --git a/django/core/db/backends/postgresql.py b/django/core/db/backends/postgresql.py
index c922fd42f6..a1de11e3df 100644
--- a/django/core/db/backends/postgresql.py
+++ b/django/core/db/backends/postgresql.py
@@ -116,6 +116,11 @@ def get_relations(cursor, table_name):
             continue
     return relations
 
+def quote_name(name):
+    if name.startswith('"') and name.endswith('"'):
+        return name # Quoting once is enough.
+    return '"%s"' % name
+
 # Register these custom typecasts, because Django expects dates/times to be
 # in Python's native (standard-library) datetime/time format, whereas psycopg
 # use mx.DateTime by default.
diff --git a/django/core/db/backends/sqlite3.py b/django/core/db/backends/sqlite3.py
index ea05302a61..3fde8c77e1 100644
--- a/django/core/db/backends/sqlite3.py
+++ b/django/core/db/backends/sqlite3.py
@@ -124,6 +124,11 @@ def get_table_list(cursor):
 def get_relations(cursor, table_name):
     raise NotImplementedError
 
+def quote_name(name):
+    if name.startswith('"') and name.endswith('"'):
+        return name # Quoting once is enough.
+    return '"%s"' % name
+
 # Operators and fields ########################################################
 
 OPERATOR_MAPPING = {
diff --git a/django/core/template/defaultfilters.py b/django/core/template/defaultfilters.py
index 2604caf7f9..3a25add5e1 100644
--- a/django/core/template/defaultfilters.py
+++ b/django/core/template/defaultfilters.py
@@ -27,7 +27,10 @@ def floatformat(text, _):
     Displays a floating point number as 34.2 (with one decimal place) -- but
     only if there's a point to be displayed
     """
-    f = float(text)
+    try:
+        f = float(text)
+    except ValueError:
+        return ''
     m = f - int(f)
     if m:
         return '%.1f' % f
diff --git a/django/core/template/defaulttags.py b/django/core/template/defaulttags.py
index bea4857dec..d7c53fe947 100644
--- a/django/core/template/defaulttags.py
+++ b/django/core/template/defaulttags.py
@@ -214,8 +214,12 @@ class SsiNode(Node):
         self.filepath, self.parsed = filepath, parsed
 
     def render(self, context):
+        from django.conf.settings import DEBUG
         if not include_is_allowed(self.filepath):
-            return '' # Fail silently for invalid includes.
+            if DEBUG:
+                return "[Didn't have permission to include file]"
+            else:
+                return '' # Fail silently for invalid includes.
         try:
             fp = open(self.filepath, 'r')
             output = fp.read()
@@ -226,8 +230,11 @@ class SsiNode(Node):
             try:
                 t = Template(output)
                 return t.render(context)
-            except TemplateSyntaxError:
-                return '' # Fail silently for invalid included templates.
+            except (TemplateSyntaxError, e):
+                if DEBUG:
+                    return "[Included template had syntax error: %s]" % e
+                else:
+                    return '' # Fail silently for invalid included templates.
         return output
 
 class LoadNode(Node):