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Sfdc wonder Delete old values after insert new data
hi,
i hav a custom object,i want to insert only single value.when i insert new data in to object,its delete old data.
i hav tried the following trigger
trigger DeleteRecord on SampleTest__c (after insert)
{
SampleTest__c[] accs=new List<SampleTest__c>();
for(SampleTest__c acc:trigger.old)
{
accs.add(acc);
}
delete accs;
}
i hav a custom object,i want to insert only single value.when i insert new data in to object,its delete old data.
i hav tried the following trigger
trigger DeleteRecord on SampleTest__c (after insert)
{
SampleTest__c[] accs=new List<SampleTest__c>();
for(SampleTest__c acc:trigger.old)
{
accs.add(acc);
}
delete accs;
}
your above trigger would show null point exception as trigger.old return null on insert even. as per my understanding you need to delete all created record from database when you try to create new record of SampleTest . so need to write code like as follow:
trigger DeleteRecord on SampleTest__c (after insert)
{
SampleTest__c[] accs=[select id from SampleTest__c where In Not IN : trigger.newMap.keySet()];
if(accs.size() > 0)
delete accs;
}
<pre>
trigger DeleteRecord on SampleTest__c (after insert)
{
delete [SELECT Id FROM SampleTest__c WHERE Id NOT IN :Trigger.new];
}
</pre>