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.
A map is a collection of key-value pairs where each unique key maps to a single value. Keys and values can be any data type—primitive types, collections, sObjects, user-defined types, and built-in Apex types.
通常我们会在SOQL查询中获取记录列表，有时我们还需要一组ID或记录ID的映射以及记录或记录ID的列表。上述要求的Apex代码如下：List<id> accIdsList = new List<id>() ;Set<id> accIdsSet = new Set<id>() ;Map<Id,Account> accountIdObjMap = new Map<Id,Account>();List<account> accList = [select...
Salesforce Maps Apex Developer Guide
Map keys and values can be of any data type, including sObject types, such as Account.
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