清除一个输入域会导致空字符串。
例如，第2行检查提供的是否是空字符串。
For example, Line 2 shows a check that determines if an empty string has been provided.
对于空字符串输入，该解析方法返回null。
如果不想让标题出现，只需将值设置为空字符串。
If you don't want a header to appear, you can simply set the value to an empty string.
如果属性不存在，那么这两种方法都将返回空字符串。
Both of these methods return an empty string if the attribute doesn't exist.
这与使用空字符串不同，空字符串表示属性存在但是没有值。
This is different from using the empty string, which indicates that the property exists but has no value.
CLP将“NULL”(以大写字符指定)识别为空字符串。
The CLP recognizes' null '(specified in uppercase characters) as a null string. For example.
如果您忽略了此参数或传递空字符串，则将使用默认匹配模式。
If you omit this parameter or pass an empty string, the default matching modes are used.
如果不是空字符串，第12和13行检查指定的集群是否存在。
If not, Lines 12 and 13 check to see if the specified cluster exists.
当前设计很难区分值为空字符串的属性和值根本不存在的属性。
The current design makes it hard to distinguish between an attribute whose value is the empty string and one that isn't present at all.
scope：搜索范围；空字符串表示搜索所有可用的索引页。
Scope: The scope to search; an empty string means search all available indexes.
如果应该使用默认值，那么这个参数可以是空字符串或NULL。
This parameter can be an empty string or NULL, if defaults should be picked.
在无法找到标签开头的其他所有情况下，我们返回一个空字符串。
In all other cases where we cannot find the beginning of a tag, we return the empty string.
在某些情况下，IP地址范围返回为一个空数组或一个空字符串。
In some cases, the IP address range is returned as an empty array or an empty string.
第一个字符是分隔符，所以WORD找到的第一项是一个空字符串。
The first character is a delimiter, so the first item WORD finds is a blank string.
在Oracle中，输入的空字符串在数据库内部存储为NULL。
Whatever is entered as empty string in Oracle gets stored as NULL internally in the database. The following shows an example of a TEST table created in Oracle and db2.
第13行中的检查也无法探测到错误，因为调用的结果不是空字符串。
Also, the test in Line 13 will fail to detect an error because the result of the call will not be an empty string.
表达式的其余部分用来检查值(去掉头尾的空格之后)是否是空字符串。
The rest of the expression is used to see if the value (without leading or trailing blanks) is an empty string.
技术上，空字符串作为URI是有效的，但不允许作为名称空间uri。
Null strings are technically valid as URIs, but disallowed as namespace URIs.
注意，RSS_URI常量代表默认前缀，因此一个空字符串用作前缀。
Note that the RSS_URI constant represents the default prefix, so an empty string is used as the prefix.
如果当前字母的下标和字符串的长度相等，那么这个变量是一个空字符串。
If the index of the current letter is equal to the length of the string, this variable is an empty string.
这意味着大部分字符串—包括大部分非空字符串—将被计算为false。
This implies that the vast majority of strings-including most non-empty strings-will evaluate as being false. A typical mistake is to test for an empty string like so.
如果定义的通道出口多于用户数据，则剩余通道出口的用户数据将为空字符串。
If you define more channel exits than user data, the user data for the remaining channel exits will be a blank string.
如果模式是NULL或空字符串，那么这个过程采用备份时的模式名进行恢复。
If the schema is NULL or the empty string, the procedure restores the schema to the name from where it was backed up.
如果提供的字符串并不包含前缀，则对应的名称空间uri将为一个空字符串。
If the supplied string does not contain a prefix, the namespace URI is an empty string.
如果页面动作方法调用返回一个非空字符串值，则Seam将其当作一个导航事件。
If a page action method invocation returns a non-null string value, Seam treats it as a navigation event.
varlist可能有点麻烦，因为它必须采用正则表达式(空字符串是绝对无效的)。
Note that the varlist function can be a little tricky because it must take a regular expression (an empty string will NOT work).
在执行脚本的过程中，可能会有一些从空字符串创建 ObjectNames 的错误。
During execution of the script, there may be some errors creating ObjectNames from empty strings.
skip变量设置为' '(空字符串)，所以所有输入(包括空格)都转至标志伪指令。
The skip variable was set to "(empty string), so all input, including Spaces, goes to the token directive."
如果您省略了表名(即指定NULL或空字符串)，那么为指定的模式中的所有表返回信息。
If you omit a table name (that is, you specify NULL or an empty string), information is returned for all tables in the schema specified.
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