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nullability
为空性
常用释义
词性释义
为空性
例句
全部
Part
of the
row
,
known
as
the
null
bitmap
,
may
be
reserved
to
manage
column
nullability
.
可以保留行的一部分(称为“空位图”),以管理列的为空性。
The
nullability
property
of
arithmetic
operators
over
floating point
data
type
is
always
nullable
.
对浮点数据类型执行运算的算术运算符的为空性属性始终可为空。
Part
of
the
row
,
known
as
the
null
bitmap
, is
reserved
to
manage
column
nullability
.
保留行中称为空位图的部分以管理列的为空性。
New
columns
defined
without
explicit
nullability
do
not
allow
nulls
.
未显式定义为空性的新列不允许使用空值。
The
nullability
characteristics
of
each
column
must
be the
same
.
每列的为空性(nullability)特征必须相同。
Cannot
change
the base
type
,
length
,
precision
,
scale
,
nullability
,
or
collation
of
an
existing
User
-
defined
datatype
.
无法更改用户定义的现有数据类型的基本类型、长度、精度、小数位数、为空性或整理规则。
Design
attribute
domain
integrity
.
Considerations
include
CHECK
constraints
,
data
types
,
and
nullability
.
设计域完整性属性。考虑CHECK约束,数据类型和是否非空。
In
addition
to
specifying
the
attributes
for your
assemblies
correctly
,
your
class
must
also
support
nullability
.
除了正确地指定程序集的属性之外,类还必须支持可空性。
DrySQL endeavors
to
exactly
mirror the
behavior
of
database
constraints
,
and introduces validates_nullability_of as
an
example
of this
.
DrySQL致力于准确的模仿数据库约束的某些行为,validates_nullabillity_of就是一个很好的例子。
Modifies
the
behavior
of the
session
to
override
default
nullability
of
new
columns
when
the ANSI
null
default
.
时,修改会话的行为以覆盖新列的默认为空性。