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在上面的代码中，如果有大量记录（例如50000条），则for循环将被执行50000次，并且for循环中的每一行也将被执行50000次。我们可以通过使用良好的SOQL查询来避免不必要的for循环，该查询将返回map而不是list。之后，我们可以使用方法轻松获得客户列表或一组客户ID或客户ID列表。新的Apex代码如下：List<id> accIdsList ...
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Construct your location data in Apex to perform a custom query, search for nearby locations, filter or transform results, or when you can’t use the results returned by a Visualforce standard controller.