Support and enable SQLAlchemy 1.4 statement cache

sqlalchemy_hana/dialect.py

@@ -14,6 +14,7 @@
 
 from functools import wraps
 
+import sqlalchemy
 from sqlalchemy import sql, types, util
 from sqlalchemy.engine import default, reflection
 from sqlalchemy.sql import compiler
@@ -50,15 +51,15 @@ def visit_bindparam(self, bindparam, **kwargs):
         # SAP HANA supports bindparameters within the columns clause of SELECT statements
         # but it will always treat such columns as NVARCHAR(5000).
         # With the effect that "select([literal(1)])" will return the string '1' instead of
-        # an interger. Therefore the following special logic for detecting such requests
-        # and rewriting the bindparam into a normal literal.
+        # an integer.
+        # The following logic detects such requests and rewriting the bindparam into a literal.
 
         if kwargs.get("within_columns_clause") and kwargs.get("within_label_clause"):
             if bindparam.value and bindparam.callable is None and not getattr(bindparam, "expanding", False):
-                return self.render_literal_bindparam(
-                    bindparam, **kwargs
-                )
-
+                if sqlalchemy.__version__.startswith("1.3"):
+                    return super(HANAStatementCompiler, self).visit_bindparam(bindparam, literal_binds=True)
+                else:
+                    return super(HANAStatementCompiler, self).visit_bindparam(bindparam, literal_execute=True)
         return super(HANAStatementCompiler, self).visit_bindparam(bindparam, **kwargs)
 
     def visit_sequence(self, seq, **kwargs):
@@ -701,7 +702,7 @@ class HANAHDBCLIDialect(HANABaseDialect):
     driver = 'hdbcli'
     default_paramstyle = 'qmark'
 
-    supports_statement_cache = False
+    supports_statement_cache = True
 
     @classmethod
     def dbapi(cls):