Sample Relationship Queries in Salesforce

Updating Child - parent Relationship for standard objects:

list<Contact> c=“Select LastName, Account.Name From Contact where name like '%red%'“;
for(Contact ct : c)
{
ct.Account.Industry='Banking'; ct.account.Rating = 'Hot'; update c.account;
}

 Updating parent - Child Relationship for standard objects:

List<Account> a = “Select Name,(Select FirstName,LastName from Account.Contacts) From Account where Name='Account1'“;
System.debug('The Account Records are' +a);
for(Account acc1:a)
{
for(Contact c:acc1.Contacts)
{
c.FirstName='Anil';
c.lastName='Reddy';
update c;
System.debug ('The Updated Contacts are' +c);
}
}

Fetching Child - Parent Relationship for Custom objects:

Patient__C pt = “select name , medical__r.name from patient__C where id='a0190000002wRdn'“;
System.debug('Patient Records '+ pt);
System.debug('Doctor Records '+pt.medical__R.Name);
list<patient__C> pt = “select name , Medical__r.name from patient__C where name like 'sath%'“;
System.debug('Patient Records '+ pt); for(patient__c pt1 :pt)
{
system.debug('medical Records Are ' + pt1) ;
}

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Updating Child - parent Relationship for Custom objects:

Patient__C pt = “select name , medical__r.name from patient__C where id='a0190000002wRdn'“;
System.debug('Patient Records '+ pt); pt.medical__r.med_quantity__C = 66; update pt.medical__r;
System.debug('Medical Name '+pt.medical__r.Name); System.debug('Medical quantity '+pt.medical__r.med_quantity__C);

 For Multiple Records:

list<patient__C> pt = “select name , Medical__r.name, medical__r.med_quantity__C from patient__C where name = 'sateesh'“;
System.debug('Patient Records '+ pt); for(patient__c pt1 :pt)
{
pt1.medical__r.med_quantity__C = 99; update pt1.medical__r;
system.debug('medical Records Are ' + pt1) ;
}

 Fetching parent - Child Relationship for Custom objects:

Medical__c t=“Select Name,(Select Name from patients__r) From Medical__c
where id='a0290000005FUJq'“;
System.debug('XXXXXXXXXXXX'+t);
System.debug('DDDDDDDDDDDDDD'+t.patients__r);
for(medical_ _c s:t.patients__r)
{
System.debug(s.Name);
}

For Mulitiple Records:-

List<Training__c> t=“Select Name,(Select Name, Student_fee__c from Students__r) From Training__c “;
for(Training__c t1:t)
{
System.debug(t1.Name);
}
for(List<Student_ _c s:t1.students_ _r)
{
System.debug('AAAAAAAAAA'+s);
}

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