[Sqlalchemy-tickets] Issue #4057: pymssql percent signs need to not be doubled (zzzeek/sqlalchemy)

[Michael B. <iss...@bi...>]

New issue 4057: pymssql percent signs need to not be doubled
https://bitbucket.org/zzzeek/sqlalchemy/issues/4057/pymssql-percent-signs-need-to-not-be

Michael Bayer:

```
#!python

from sqlalchemy import *

e = create_engine("mssql+pymssql://scott:tiger^5HHH@mssql2017:1433/test", echo=True)

c = e.connect()
c.execute("drop table if exists foo")
c.execute("""
    create table foo (
        d1 integer,
        d2 integer
    )
""")

c.execute(text("""
    insert into foo (d1, d2) values (:d1, 29 % 10)
"""), {"d1": 10})

print c.execute("select * from foo").fetchall()
```


```
#!python

sqlalchemy.exc.ProgrammingError: (pymssql.ProgrammingError) (102, "Incorrect syntax near '10'.DB-Lib error message 20018, severity 15:\nGeneral SQL Server error: Check messages from the SQL Server\n") [SQL: '\n    insert into foo (d1, d2) values (%(d1)s, 29 %% 10)\n'] [parameters: {'d1': 10}]

```