fixes for Boolean type

sqlalchemy_iris/base.py

@@ -348,6 +348,18 @@ def _get_limit_or_fetch(self, select):
         else:
             return select._fetch_clause
 
+    def visit_true(self, expr, **kw):
+        return "1"
+
+    def visit_false(self, expr, **kw):
+        return "0"
+
+    def visit_is_true_unary_operator(self, element, operator, **kw):
+        return "%s = 1" % self.process(element.element, **kw)
+
+    def visit_is_false_unary_operator(self, element, operator, **kw):
+        return "%s = 0" % self.process(element.element, **kw)
+
     def get_select_precolumns(self, select, **kw):
 
         text = ""
@@ -556,6 +568,7 @@ def create_cursor(self):
 
 
 colspecs = {
+    sqltypes.Boolean: types.IRISBoolean,
     sqltypes.Date: types.IRISDate,
     sqltypes.DateTime: types.IRISDateTime,
     sqltypes.TIMESTAMP: types.IRISTimeStamp,
@@ -580,10 +593,12 @@ class IRISDialect(default.DefaultDialect):
     supports_views = True
     supports_default_values = True
 
+    supports_native_boolean = True
+    non_native_boolean_check_constraint = False
+
     supports_sequences = False
 
     postfetch_lastrowid = True
-    non_native_boolean_check_constraint = False
     supports_simple_order_by_label = False
     supports_empty_insert = False
     supports_is_distinct_from = False

sqlalchemy_iris/types.py

@@ -5,6 +5,27 @@
 HOROLOG_ORDINAL = datetime.date(1840, 12, 31).toordinal()
 
 
+class IRISBoolean(sqltypes.Boolean):
+    def _should_create_constraint(self, compiler, **kw):
+        return False
+
+    def bind_processor(self, dialect):
+        def process(value):
+            if isinstance(value, int):
+                return 1 if value > 0 else 0
+            elif isinstance(value, bool):
+                return 1 if value is True else 0
+            return None
+        return process
+
+    def result_processor(self, dialect, coltype):
+        def process(value):
+            if isinstance(value, int):
+                return value > 0
+            return value
+        return process
+
+
 class IRISDate(sqltypes.Date):
     def bind_processor(self, dialect):
         def process(value):