Apex - SOSL

每个业务或应用程序都将搜索功能作为基本需求之一。为此，Salesforce.com 提供了两种主要方法：使用 SOSL 和 SOQL。本章将详细讨论 SOSL 方法。

SOSL

使用 SOSL 可以跨对象和跨字段搜索文本字符串。这是 Salesforce 对象搜索语言。它能够跨多个对象搜索特定字符串。

SOSL 语句计算结果为 sObject 列表，其中每个列表包含特定 sObject 类型的搜索结果。结果列表始终按 SOSL 查询中指定的顺序返回。

SOSL 查询示例

考虑一个业务案例，我们需要开发一个可以搜索指定字符串的程序。假设我们需要在发票对象的“客户名称”字段中搜索字符串“ABC”。代码如下：

首先，您必须在发票对象中创建一个单条记录，其客户名称为“ABC”，以便在搜索时获得有效结果。

// Program To Search the given string in all Object
// List to hold the returned results of sObject generic type
List<list<SObject>> invoiceSearchList = new List<List<SObject>>();

// SOSL query which will search for 'ABC' string in Customer Name field of Invoice Object
invoiceSearchList = [FIND 'ABC*' IN ALL FIELDS RETURNING APEX_Invoice_c
   (Id,APEX_Customer_r.Name)];

// Returned result will be printed
System.debug('Search Result '+invoiceSearchList);

// Now suppose, you would like to search string 'ABC' in two objects,
// that is Invoice and Account. Then for this query goes like this:

// Program To Search the given string in Invoice and Account object,
// you could specify more objects if you want, create an Account with Name as ABC.

// List to hold the returned results of sObject generic type
List<List<SObject>> invoiceAndSearchList = new List<List<SObject>>();

// SOSL query which will search for 'ABC' string in Invoice and in Account object's fields
invoiceAndSearchList = [FIND 'ABC*' IN ALL FIELDS RETURNING APEX_Invoice__c
   (Id,APEX_Customer__r.Name), Account];

// Returned result will be printed
System.debug('Search Result '+invoiceAndSearchList);

// This list will hold the returned results for Invoice Object
APEX_Invoice__c [] searchedInvoice = ((List<APEX_Invoice_c>)invoiceAndSearchList[0]);

// This list will hold the returned results for Account Object
Account [] searchedAccount = ((List<Account>)invoiceAndSearchList[1]);
System.debug('Value of searchedInvoice'+searchedInvoice+'Value of searchedAccount'
   + searchedAccount);

SOQL

这与 SOQL 几乎相同。您可以使用它一次仅从一个对象中获取对象记录。您可以编写嵌套查询，也可以从您现在正在查询的父对象或子对象中获取记录。

我们将在下一章中探讨 SOQL。