- The Boolean type, when used on a backend that doesn't

have native boolean support, will generate a CHECK
constraint "col IN (0, 1)" along with the int/smallint-
based column type.  This can be switched off if
desired with create_constraint=False.
Note that MySQL has no native boolean *or* CHECK constraint
support so this feature isn't available on that platform.
[ticket:1589]

1 files changed, 4 insertions, 23 deletions

diff --git a/lib/sqlalchemy/dialects/firebird/base.py b/lib/sqlalchemy/dialects/firebird/base.py
index 21fec6b51..86d6876a6 100644
--- a/lib/sqlalchemy/dialects/firebird/base.py
+++ b/lib/sqlalchemy/dialects/firebird/base.py
@@ -123,29 +123,7 @@ RESERVED_WORDS = set([
     ])
 
 
-class _FBBoolean(sqltypes.Boolean):
-    def result_processor(self, dialect, coltype):
-        def process(value):
-            if value is None:
-                return None
-            return value and True or False
-        return process
-
-    def bind_processor(self, dialect):
-        def process(value):
-            if value is True:
-                return 1
-            elif value is False:
-                return 0
-            elif value is None:
-                return None
-            else:
-                return value and True or False
-        return process
-
-
 colspecs = {
-    sqltypes.Boolean: _FBBoolean,
 }
 
 ischema_names = {
@@ -321,10 +299,13 @@ class FBDialect(default.DefaultDialect):
     sequences_optional = False
     supports_default_values = True
     postfetch_lastrowid = False
-
+    
+    supports_native_boolean = False
+    
     requires_name_normalize = True
     supports_empty_insert = False
 
+    
     statement_compiler = FBCompiler
     ddl_compiler = FBDDLCompiler
     preparer = FBIdentifierPreparer