diff options
Diffstat (limited to 'lib/sqlalchemy/engine/default.py')
| -rw-r--r-- | lib/sqlalchemy/engine/default.py | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/lib/sqlalchemy/engine/default.py b/lib/sqlalchemy/engine/default.py index 7391e7b01..5193a0273 100644 --- a/lib/sqlalchemy/engine/default.py +++ b/lib/sqlalchemy/engine/default.py @@ -44,6 +44,7 @@ CACHE_HIT = util.symbol("CACHE_HIT") CACHE_MISS = util.symbol("CACHE_MISS") CACHING_DISABLED = util.symbol("CACHING_DISABLED") NO_CACHE_KEY = util.symbol("NO_CACHE_KEY") +NO_DIALECT_SUPPORT = util.symbol("NO_DIALECT_SUPPORT") class DefaultDialect(interfaces.Dialect): @@ -57,6 +58,7 @@ class DefaultDialect(interfaces.Dialect): supports_comments = False inline_comments = False use_setinputsizes = False + supports_statement_cache = True # the first value we'd get for an autoincrement # column. @@ -215,6 +217,7 @@ class DefaultDialect(interfaces.Dialect): CACHE_MISS = CACHE_MISS CACHING_DISABLED = CACHING_DISABLED NO_CACHE_KEY = NO_CACHE_KEY + NO_DIALECT_SUPPORT = NO_DIALECT_SUPPORT @util.deprecated_params( convert_unicode=( @@ -320,6 +323,13 @@ class DefaultDialect(interfaces.Dialect): self._decoder = processors.to_unicode_processor_factory(self.encoding) @util.memoized_property + def _supports_statement_cache(self): + return ( + self.__class__.__dict__.get("supports_statement_cache", False) + is True + ) + + @util.memoized_property def _type_memos(self): return weakref.WeakKeyDictionary() @@ -771,6 +781,8 @@ class StrCompileDialect(DefaultDialect): type_compiler = compiler.StrSQLTypeCompiler preparer = compiler.IdentifierPreparer + supports_statement_cache = True + supports_sequences = True sequences_optional = True preexecute_autoincrement_sequences = False @@ -1137,6 +1149,12 @@ class DefaultExecutionContext(interfaces.ExecutionContext): return "generated in %.5fs" % (now - self.compiled._gen_time,) elif ch is CACHING_DISABLED: return "caching disabled %.5fs" % (now - self.compiled._gen_time,) + elif ch is NO_DIALECT_SUPPORT: + return "dialect %s+%s does not support caching %.5fs" % ( + self.dialect.name, + self.dialect.driver, + now - self.compiled._gen_time, + ) else: return "unknown" |