diff options
Diffstat (limited to 'lib/sqlalchemy/dialects/mysql/base.py')
| -rw-r--r-- | lib/sqlalchemy/dialects/mysql/base.py | 19 |
1 files changed, 18 insertions, 1 deletions
diff --git a/lib/sqlalchemy/dialects/mysql/base.py b/lib/sqlalchemy/dialects/mysql/base.py index 6883be5af..6ffc1319a 100644 --- a/lib/sqlalchemy/dialects/mysql/base.py +++ b/lib/sqlalchemy/dialects/mysql/base.py @@ -398,7 +398,8 @@ class _FloatType(_NumericType, sqltypes.Float): raise exc.ArgumentError( "You must specify both precision and scale or omit " "both altogether.") - + if scale is not None: + kw.setdefault('decimal_return_scale', scale) super(_FloatType, self).__init__(precision=precision, asdecimal=asdecimal, **kw) self.scale = scale @@ -490,6 +491,14 @@ class DOUBLE(_FloatType): def __init__(self, precision=None, scale=None, asdecimal=True, **kw): """Construct a DOUBLE. + .. note:: + + The :class:`.DOUBLE` type by default converts from float + to Decimal, using a truncation that defaults to 10 digits. Specify + either ``scale=n`` or ``decimal_return_scale=n`` in order to change + this scale, or ``asdecimal=False`` to return values directly as + Python floating points. + :param precision: Total digits in this number. If scale and precision are both None, values are stored to limits allowed by the server. @@ -515,6 +524,14 @@ class REAL(_FloatType, sqltypes.REAL): def __init__(self, precision=None, scale=None, asdecimal=True, **kw): """Construct a REAL. + .. note:: + + The :class:`.REAL` type by default converts from float + to Decimal, using a truncation that defaults to 10 digits. Specify + either ``scale=n`` or ``decimal_return_scale=n`` in order to change + this scale, or ``asdecimal=False`` to return values directly as + Python floating points. + :param precision: Total digits in this number. If scale and precision are both None, values are stored to limits allowed by the server. |