Then when a value is set, the key is removed from the database and a new record is added with the updated value.
在设置一个值后，键就从数据库中移除掉，并添加一条具有更新过的值的新记录。
In this case, the first method would obtain the value of the header field by specifying its index in the result set and the next one would retrieve a header field value by looking up its key by name.
在这种情况下，第一个方法将通过指定结果集中的索引获得头字段的值，第二个方法通过用名字查询键来获得头字段的值。
If you've used Rails acts_as_authenticated, you know that a logged-in user will set the value associated with the: user key within the session.
如果使用过Rails acts_as_authenticated，就会知道登录用户会设置与会话中的：user密钥相关联的值。
The ZODB will always be able to see when you set a key to a new value. So a change to the above database like the following will get automatically detected and persisted.
当您将某个键设置为新值时，ZODB始终能够了解这一点。
Within the loop, we extract the value for the iterated key, and then we attempt to set that value into the bean through reflection, using the helper function defined in the PBHandler class.
在循环内部，我们为遍历到的键提取值，然后使用在PBHandler中定义的helper函数通过反射将该值放置到bean中。
The Map operation, written by the user, takes an input pair and produces a set of intermediate key/value pairs.
用户编写的Map操作需要输入并生成一组中间键/值对。
Because of their simplicity, key-value stores are useful for a smaller set of jobs but can do those jobs very quickly.
由于其简单，键值存储对于较小系列的作业非常有用，而且可以非常快速地执行那些作业。
If using the above CSV file to retrieve a state name based on a state abbreviation, you can set up the lookup to use column 1 as the key column and column 0 as the value column.
如果使用以上CSV文件根据国家缩写检索一个国家名，您可以设置查找来使用列1作为键列，并将列0作为值列。
The map message is essentially a set of key-value pairs, which makes it suitable to carry a flattened document, as described in the previous section.
映射消息实际上是一组键值对，这使它适合携带扁平结构的文档，如前文所述。
Make a separate table for each set of related attributes, and give each table a primary key. Each field contains at most one value from its attribute domain.
为每个相关属性的集合创建一个单独的表，并为每个表指定一个主键。每列最多包含一个来自其属性域的值。
The tag works like a Hashtable, defining a key/value pairing to set the properties.
标签就像一个Hashtable，它定义一个键 /值对来设置属性。
The schema constraint count(key('ids', .)) = 1 checks the set of all identifiers to be sure that only one has the current value (in other words whether the identifier is unique).
模式将限定count(key('ids',.) ) =1检查所有的标识符，从而确保只有一个包含当前值（换句话说，确定该标识符是否是惟一的）。
In order to set up a filter condition on that SDO record, you must use nested f: parameter tags on the download component with a value that identifies a key for the record.
为了给那个SDO记录设置一个过滤条件，用户必须在下在组件上使用嵌套的f：parameter标签，标签上带有一个标识记录关键字的值。
Each ObjectGrid is composed of one or more maps, with each map consisting of a set of key and value pairs.
每个ObjectGrid都由一个或多个映射组成，而每个映射又由一组键值对组成。
Under that key, the string value, CLSID, must be set to the CLSID of the protocol handler.
在这个key名下，添加一个字符串为CLSID，必须设置这个协议处理器的CLSID。
set(key, value [, expiry]) — Stores the specified value using the identifier key in the cache.
set(key,value [,expiry]) —使用缓存内的标识符键存储这个特定的值。
Map, written by a user of the MapReduce library, takes an input pair and produces a set of intermediate key/value pairs.
MapReduce库的用户指定一个Map函数，通过这个函数接收key/value对，然后产生一系列的中间key/value对。
The user must supply the value for this key. A user or application may set or change the key value by calling the WlanHostedNetworkSetSecondaryKey function or by using the netsh wlan commands.
应用程序可以调用WlanHostedNetworksetsecondarykey函数，用户则可以使用netshwlan命令来设置或更改其值。
The match criteria is a set of key/value pairs that is used to define the scope of a policy. Two specific key values of interest are
匹配标准由一组key值 对组成，用来定义策略的作用范围。
When a change is made to a relationship, the related foreign-key property is set to a null value.
当一个变化是一个关系，相关的外键的属性设置为空值。
If the user presses a correct key, that digit is returned to the caller, and the "digits_received" channel variable is set to the same value.
如果用户输入正确，则输入的数字会返回给调用者，并保存到通道变量digits_received中。
If the user presses a correct key, that digit is returned to the caller, and the "digits_received" channel variable is set to the same value.
如果用户输入正确，则输入的数字会返回给调用者，并保存到通道变量digits_received中。
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