More adjustment to this SQLite related issue which was released in

0.7.9, to intercept legacy SQLite quoting characters when reflecting
foreign keys.  In addition to intercepting double quotes, other
quoting characters such as brackets, backticks, and single quotes
are now also intercepted. [ticket:2568]

doc/build/changelog/changelog_07.rst

@@ -27,6 +27,16 @@
       to the MSSQL dialect's "schema rendering"
       logic's failure to take .key into account.
 
+    .. change::
+        :tags: sqlite, bug
+        :tickets: 2568
+
+      More adjustment to this SQLite related issue which was released in
+      0.7.9, to intercept legacy SQLite quoting characters when reflecting
+      foreign keys.  In addition to intercepting double quotes, other
+      quoting characters such as brackets, backticks, and single quotes
+      are now also intercepted.
+
     .. change::
         :tags: sql, bug
         :tickets: 2631

lib/sqlalchemy/dialects/sqlite/base.py

@@ -550,6 +550,8 @@ class SQLiteDialect(default.DefaultDialect):
     supports_cast = True
     supports_default_values = True
 
+    _broken_fk_pragma_quotes = False
+
     def __init__(self, isolation_level=None, native_datetime=False, **kwargs):
         default.DefaultDialect.__init__(self, **kwargs)
         self.isolation_level = isolation_level
@@ -566,6 +568,12 @@ class SQLiteDialect(default.DefaultDialect):
             self.supports_cast = \
                                 self.dbapi.sqlite_version_info >= (3, 2, 3)
 
+            # see http://www.sqlalchemy.org/trac/ticket/2568
+            # as well as http://www.sqlite.org/src/info/600482d161
+            self._broken_fk_pragma_quotes = \
+                                self.dbapi.sqlite_version_info < (3, 6, 14)
+
+
     _isolation_lookup = {
         'READ UNCOMMITTED':1,
         'SERIALIZABLE':0
@@ -772,7 +780,8 @@ class SQLiteDialect(default.DefaultDialect):
         else:
             pragma = "PRAGMA "
         qtable = quote(table_name)
-        c = _pragma_cursor(connection.execute("%sforeign_key_list(%s)" % (pragma, qtable)))
+        statement = "%sforeign_key_list(%s)" % (pragma, qtable)
+        c = _pragma_cursor(connection.execute(statement))
         fkeys = []
         fks = {}
         while True:
@@ -780,37 +789,38 @@ class SQLiteDialect(default.DefaultDialect):
             if row is None:
                 break
             (numerical_id, rtbl, lcol, rcol) = (row[0], row[2], row[3], row[4])
-            # sqlite won't return rcol if the table
-            # was created with REFERENCES <tablename>, no col
-            if rcol is None:
-                rcol = lcol
 
-            # see http://www.sqlalchemy.org/trac/ticket/2568
-            # as well as http://www.sqlite.org/src/info/600482d161
-            if self.dbapi.sqlite_version_info < (3, 6, 14):
-                rtbl = re.sub(r'^\"|\"$', '', rtbl)
-
-            try:
-                fk = fks[numerical_id]
-            except KeyError:
-                fk = {
-                    'name': None,
-                    'constrained_columns' : [],
-                    'referred_schema' : None,
-                    'referred_table' : rtbl,
-                    'referred_columns' : []
-                }
-                fkeys.append(fk)
-                fks[numerical_id] = fk
-
-            # look up the table based on the given table's engine, not 'self',
-            # since it could be a ProxyEngine
-            if lcol not in fk['constrained_columns']:
-                fk['constrained_columns'].append(lcol)
-            if rcol not in fk['referred_columns']:
-                fk['referred_columns'].append(rcol)
+            self._parse_fk(fks, fkeys, numerical_id, rtbl, lcol, rcol)
         return fkeys
 
+    def _parse_fk(self, fks, fkeys, numerical_id, rtbl, lcol, rcol):
+        # sqlite won't return rcol if the table
+        # was created with REFERENCES <tablename>, no col
+        if rcol is None:
+            rcol = lcol
+
+        if self._broken_fk_pragma_quotes:
+            rtbl = re.sub(r'^[\"\[`\']|[\"\]`\']$', '', rtbl)
+
+        try:
+            fk = fks[numerical_id]
+        except KeyError:
+            fk = {
+                'name': None,
+                'constrained_columns': [],
+                'referred_schema': None,
+                'referred_table': rtbl,
+                'referred_columns': []
+            }
+            fkeys.append(fk)
+            fks[numerical_id] = fk
+
+        if lcol not in fk['constrained_columns']:
+            fk['constrained_columns'].append(lcol)
+        if rcol not in fk['referred_columns']:
+            fk['referred_columns'].append(rcol)
+        return fk
+
     @reflection.cache
     def get_indexes(self, connection, table_name, schema=None, **kw):
         quote = self.identifier_preparer.quote_identifier

test/dialect/test_sqlite.py

@@ -314,7 +314,7 @@ class DialectTest(fixtures.TestBase, AssertsExecutionResults):
             meta.drop_all()
 
     @testing.provide_metadata
-    def test_quoted_identifiers_one(self):
+    def test_quoted_identifiers_functional_one(self):
         """Tests autoload of tables created with quoted column names."""
 
         metadata = self.metadata
@@ -340,7 +340,7 @@ class DialectTest(fixtures.TestBase, AssertsExecutionResults):
                 == table2.c.id)
 
     @testing.provide_metadata
-    def test_quoted_identifiers_two(self):
+    def test_quoted_identifiers_functional_two(self):
         """"test the edgiest of edge cases, quoted table/col names
         that start and end with quotes.
 
@@ -375,6 +375,30 @@ class DialectTest(fixtures.TestBase, AssertsExecutionResults):
         #assert j.onclause.compare(table1.c['"id"']
         #        == table2.c['"aid"'])
 
+    def test_legacy_quoted_identifiers_unit(self):
+        dialect = sqlite.dialect()
+        dialect._broken_fk_pragma_quotes = True
+
+
+        for row in [
+            (0, 'target', 'tid', 'id'),
+            (0, '"target"', 'tid', 'id'),
+            (0, '[target]', 'tid', 'id'),
+            (0, "'target'", 'tid', 'id'),
+            (0, '`target`', 'tid', 'id'),
+        ]:
+            fks = {}
+            fkeys = []
+            dialect._parse_fk(fks, fkeys, *row)
+            eq_(fkeys, [{
+                    'referred_table': 'target',
+                    'referred_columns': ['id'],
+                    'referred_schema': None,
+                    'name': None,
+                    'constrained_columns': ['tid']
+                }])
+
+
     def test_attached_as_schema(self):
         cx = testing.db.connect()
         try: