10个销售人员面试必备问题 *

To retain the view state and use the previous page’s variable in a redirected page, we have to call setRedirect(假) on a new PageReference 实例(例如，在按钮的单击处理程序中).)

SOAP APIs use WSDL files to make objects and database access available to Salesforce. REST可以基于JSON或xml，而SOAP只能基于xml. REST is most often used by mobile apps, while SOAP is used to connect with legacy systems. For example, 如果我们想用Salesforce连接SAP, 那么SAP将提供一个WSDL文件来连接到他们的数据库. We can use REST when a third-party system wants to extract data from or insert data into a Salesforce database.

We use insert so that if any error occurs in any record, the system will throw a System.DmlException:插入失败 异常，则不会插入任何记录.

If we want to allow partially successful bulk insert operations, we use database.insert() instead.

批处理类是一个异步方法, 所以当批处理类运行时, 每个执行方法都在单独的线程中处理. Now if we have mentioned one list globally to update all of the processed records in a finish method, then we will need to make this batch class stateful to retain the values of global variables. Otherwise, each thread will have its own separate copy of all global variables, so none of them will add to the list used by the main thread’s finish method.

Schema.descripbefieldresult fieldResult =账号.Industry.getDescribe();
List ple = fieldResult.getPicklistValues ();

There are four types of sandbox org available with Enterprise Edition:

• Developer 提供200mb的数据空间
• Developer Pro 提供1GB的数据空间
• Partial Copy provides 5GB of data space, records (a sample of selected objects), and sandbox template support
• Full Copy is the same as a production org, with the same record ids the production records have

请注意，它们都提供:

• 内置于Salesforce中的标准配置
• 顶点和元数据
• 从生产中复制的所有用户

沙盒org类型的用途如下:

• Developer and Developer Pro这两者之间的唯一区别是它们的数据空间, they are both used to code and enhance existing functionality and then move it to production.
• Partial Copy: Generally, when we are dealing with large amounts of data and want to have real-time testing data, 那么这个沙盒是有用的，因为Salesforce提供了多达10个,生产数据中每个对象的000条记录.
• Full Copy: When you want to replicate a production issue in a sandbox and fix it, 那么这个沙盒是最合适的. That’s because even if you wanted to debug directly in production, you can’t. Also, 有时是为了重现问题并修复它, 我们需要完全相同的数据, 这就是完整复制沙盒带给你的.

是的，我们可以从自定义按钮调用类方法. 调用一个类的方法, 我们需要在自定义按钮中使用连接JS和Apex JS, and then we can call the Apex class method using the following syntax:

{!requireScript(“/ soap / ajax / 20.0/connection.js")}
{!requireScript(“/ soap / ajax / 20.0/apex.js")}

retStr = sforce.apex.执行("SampleClass"， "SampleMethod"，{方法的参数});

Note: The class you are calling must be a global or Webservice class.

Because the string is not a full date, we cannot use functions like Date.parse(). 现在我们设字段名是 month:

FirstDate = date.newInstance(月.分割(“-”)[1].split('-')[0],1);
LastDate = firstDate.addMonth(1).addDays(-1);

A wrapper class is an outer class that we use to bind values or objects which are not available in the inner class.

Use cases:

• Let’s say we want to display account records and we want to let the user select a record to perform an action on. We can create a wrapper class with one field as a boolean value and another as an account object, 把两者结合在一起.
• A wrapper class is also used when we have to display data in a matrix format.
• If we want to show a scoreboard of recruiters from a placement object in a table, then we need to use a wrapper to store the recruiter name and corresponding score. 因为有很多职位和招聘人员, 我们必须将给定的实习编号映射到招聘人员, and only then can we bind recruiters with scores and display them in a table.

Heap size is the size of the temporary storage of your data while executing your code in synchronous mode. 所有的全局变量都存储在堆上. 对于异步模式, 堆大小限制为12 MB, 对于同步模式, 堆大小限制为6 MB.

要减少堆大小，请采取以下步骤:

1. 如果不需要，减少使用全局变量.
2. 如果没有必要，避免使用太多的地图. Try to reuse maps that are already defined if you’re using them for the same purpose later on, or call clear() 当你用完它们来释放堆空间时.
3. 使用过滤器来避免存储不必要的数据 List and Map. The heap size mainly increases due to storing data retrieved from a database in a variable. 所以如果数据不是必需的，那么我们应该 clear() 他们在我们完成我们的一个特定的使用 Map or List.
4. 避免使用嵌套 for loops. If there is no way to avoid nested loops then put filter conditions in such a way that you can reduce execution statements.