Double percent signs based on paramstyle, not dialect

This patch moves the "doubling" of percent signs into
the base compiler and makes it completely a product
of whether or not the paramstyle is format/pyformat or
not.   Without this paramstyle, percent signs
are not doubled across text(), literal_column(), and
column().

Change-Id: Ie2f278ab1dbb94b5078f85c0096d74dbfa049197
Fixes: #3740

1 files changed, 2 insertions, 10 deletions

diff --git a/lib/sqlalchemy/dialects/mysql/mysqldb.py b/lib/sqlalchemy/dialects/mysql/mysqldb.py
index 6af860133..7941d4c41 100644
--- a/lib/sqlalchemy/dialects/mysql/mysqldb.py
+++ b/lib/sqlalchemy/dialects/mysql/mysqldb.py
@@ -64,19 +64,11 @@ class MySQLExecutionContext_mysqldb(MySQLExecutionContext):
 
 
 class MySQLCompiler_mysqldb(MySQLCompiler):
-    def visit_mod_binary(self, binary, operator, **kw):
-        return self.process(binary.left, **kw) + " %% " + \
-            self.process(binary.right, **kw)
-
-    def post_process_text(self, text):
-        return text.replace('%', '%%')
+    pass
 
 
 class MySQLIdentifierPreparer_mysqldb(MySQLIdentifierPreparer):
-
-    def _escape_identifier(self, value):
-        value = value.replace(self.escape_quote, self.escape_to_quote)
-        return value.replace("%", "%%")
+    pass
 
 
 class MySQLDialect_mysqldb(MySQLDialect):