Salesforce - Apex - 根据事件历史记录查询帐户

Question

嘿 Salesforce 专家，

我有一个如何高效查询账户信息的问题。我想根据 ActivityHistory 对象中的更新查询帐户。我遇到的问题是，无论是否有“完整”的 activeHistory ，所有帐户都会被检索。那么，有没有一种方法可以编写此查询来仅检索具有 status="complete"且 Type_for_reporting='QRC' 的 activeHistory 帐户？

List<Account> AccountsWithActivityHistories = [    
    SELECT
         Id
        ,Name
        ,( SELECT
                ActivityDate
               ,ActivityType
               ,Type_for_Reporting__c
               ,Description
               ,CreatedBy.Name
               ,Status
               ,WhatId
            FROM ActivityHistories
            WHERE Status ='complete'  and Type_for_Reporting__c = 'QRC'
        )
    FROM Account
];

Answer 1

您在历史记录中有一个 WHERE 子句，但在帐户级别仍然缺少一个。

例如，这将仅返回具有联系人的帐户:

SELECT Id, Name
FROM Account
WHERE Id IN (SELECT AccountId FROM Contact) // try with NOT IN too

---

对于 Activity，情况会比较棘手，因为它们不喜欢以这种方式在 WHERE 中使用。

http://www.salesforce.com/us/developer/docs/officetoolkit/Content/sforce_api_calls_soql_select.htm

The following objects are not currently supported in subqueries:

• ActivityHistory
• Attachments
• Event
• EventAttendee
• Note
• OpenActivity
• Tags (AccountTag, ContactTag, and all other tag objects)
• Task

此外ActivityHistory底部的小字定义也有点令人沮丧。

对没有“查看所有数据”权限的用户的以下限制有助于防止性能问题:

• In the main clause of the relationship query, you can reference only one record. For example, you can’t filter on all records where the account name starts with ‘A’; instead, you must reference a single account record.
• You can’t use WHERE clauses.
• You must specify a limit of 499 or fewer on the number of rows returned in the list.
• You must sort on ActivityDate in ascending order and LastModifiedDate in descending order; you can display nulls last. For example: ORDER BY ActivityDate ASC NULLS LAST, LastModifiedDate DESC.

---

看起来您将需要多个查询。转到任务(或事件，具体取决于自定义字段可见)，组成一组 AccountId，然后查询帐户？

或者您可以从原始查询中手动筛选列表，将帐户复制到帮助程序列表:

List<Account> finalResults = new List<Account>();
for(Account a : [SELECT...]){
    if(!a.ActivityHistories.isEmpty()){
        finalResults.add(a);
    }
}