This may be in the form of Null values or other blank value conditions (for example, Spaces) in situations where the data is required.
如果数据是必需的，这可能以null值或其他空白值(例如空格)的形式出现。
This may be in the form of Null values or other blank value conditions (for examples, Spaces) for one or multiple data elements of the entity.
对于实体的一个或多个数据元素，这可能以null值或空白值(例如空格)的形式出现。
This may be in the form of specific set values (for example, all 9's or 'Do Not Use') or blank values (where a blank represents a keystroke distinct from a null value).
这可能以特定的设置值(例如所有的9或‘DoNotUse’)或空白值(一个空白表示一个按键，这不同于一个null值)的形式出现。
This may be in the form of null values or other blank value conditions (for example, spaces).
这可能以null值或其他空白值（例如空格）的形式出现。
If the HTTP method is GET (currently not used by JSF forms), the form data has already been appended to the URL and send is called with a null parameter.
如果HTTP方法是GET(当前未被JSF表单使用)，那么表单数据应该已经追加到此url，并会用null参数调用send 。
For example, if email address is null or only contains Spaces, the message "Enter your email" will be shown when the form is validated.
例如，如果email地址为空，或者只包含空格字符，那么在对表单进行验证时就会显示“Enteryour email”消息。
If the form input field is not null, set the payload you receive as the widget value, as shown in Listing 14.
如果表单输入字段不为空，将小部件的值设为接收到的负载，如清单14所示。
If you leave a String field blank in an HTML form, it comes back to the controller in the params Map as an empty String (that is, ) instead of null.
如果在HTML表单中将String字段保留为空，paramsmap中的控制器会将其看作空string(也就是“ ”)，而不是null。
It can constrain frequency response of filter Banks to form null at zero frequency point and to obtain minimum side lobe area.
它可强制滤波器组的频率特性在零频形成零点并使旁瓣面积最小。
The system was converted to the block controllable form consisting of two parts, one was the range space subsystem and the other was the stable null space subsystem.
通过状态变换和去耦合处理将系统转换为块能控标准型，它由值域空间子系统和稳定的零空间子系统组成。
"This behavior occurs because the primary key or the" not NULL "column of the database table was not selected in the data Form Wizard."
此行为的发生是由于在“数据窗体向导”中未选择数据库表的主键或“非null”列。
"This behavior occurs because the primary key or the" not NULL "column of the database table was not selected in the data Form Wizard."
此行为的发生是由于在“数据窗体向导”中未选择数据库表的主键或“非null”列。
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