Another interesting aspect of JPA query parameters is that they do not have intrinsic value.

JPA查询参数的另一个有趣方面是它们没有内部值。

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Parameter MARKER: an application may wish to call the same query multiple times, only changing specific values each time (ex: parameters sent to a stored procedure, or a value in a WHERE clause).

参数标志(PARAMETER MARKER)：应用程序可能希望多次调用同一个查询，每次调用时只改变特定的值(例如，发送给存储过程的参数，或者where子句中的值)。

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For parameters that come from the URI, we want to ensure that the URI actually contains a value for that parameter, either in the path (via the route dictionary) or in the query string.

对于来自uri的参数，我们希望确保URI在其路径(通过路由字典)或查询字符串中实际包含了一个用于此参数的值。

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