Salesforce：Apex 触发器检查电子邮件域是否存在

Question

我想知道邮箱域是否存在于数据库中。例如：如果要插入xxx@abc.com，我想检查具有相同域（abc.com）的电子邮件是否已经存在。以下是检查整个电子邮件是否存在的代码。

trigger trig_Contact_webToContact on Contact (before insert) 
{
  final String errMsg = 'The email already exists on another Contact: ';
  Set< String > emailSet = new Set< String >();
  for( Contact c : Trigger.new ) emailSet.add( c.Email );

  Map< String, Id > duplicateContactMap = new Map< String, Id >();

  for( Contact c : [select Id, Email from Contact where Email = :emailSet] )
    duplicateContactMap.put( c.Email, c.Id );

  for( Contact c : Trigger.new ){
    Id duplicateContactId = duplicateContactMap.get( c.Email );
    if( duplicateContactId != null )
      c.addError( errMsg + duplicateContactId );
  }
}

Answer 1

首先，只从电子邮件中获取域，而不是整个电子邮件：

Set< String > emailDomainSet = new Set< String >();
for( Contact c : Trigger.new ) {
  if (String.isBlank(c.Email)) continue;
  int indexOfAt = c.Email.indexOf('@');
  if (indexOfAt > 0) emailDomainSet.add( c.Email.substring(indexOfAt) );
}

那么，在您的情况下，您需要使用 query(queryString) 方法。先写一个SOQL字符串

string queryString = 'select name from Contact where  ';
string whereClause = ' ';
for (string domainItem : emailDomainSet) {
  whereClause += ' or Email like \'%'+domainItem + '\' ';
}    
whereClause = whereClause.substring(4);//remove first or in where clause
queryString += whereClause;

然后，运行它。而不是

for( Contact c : [select Id, Email from Contact where Email = :emailSet] )

你应该放

for( Contact c : (List<Contact>)Database.query(queryString) )

Salesforce：Apex 触发器检查电子邮件域是否存在

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