In this episode we will learn about retrieving and manipulating data stored within Salesforce programmatically using Apex. Join us as you embark on this wonderful journey to become a champion Salesforce developer.
Episode 4 will be presented by Saket Joshi on Feb 13, 2020 at 6 PM Indian Standard Time.
Agenda
- What is SOQL
- Basics of SOQL
- Relationship Queries
- SOQL in Apex, Querying Records in Batches by Using SOQL for Loops
- Introduction to SOSL
- Using the right tool for the job SOQL Vs SOSL
- Understanding DML Operations & Methods
- Writing optimal queries – Query Plan
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What is SOQL
SOQL Stands for Salesforce Object Query Language. Similar to SQL, but is designed specifically for Salesforce data. Uses the same structure and keywords from SQL. You can query data from Salesforce using SOQL in –
1) Apex Code
2) Developer Console
3) Salesforce REST and SOAP APIs
4) Salesforce CLI
Basics of SOQL
Conditional Expressions
| Conditional Operator | Description |
| = | Equals |
| != | Not Equals |
| < , <= | Less Than, Less Than or Equal To |
| > , >= | Greater Than, Greater Than or Equal To |
| INCLUDES, EXCLUDES | Includes or Excludes Values. Applies only to Multi-Select Picklists. |
| LIKE | Returns the records where the field values match the pattern specified after the LIKE operator |
| IN | Selects only the records where the value of the field matches any of the values specified after IN keyword |
| NOT IN | Selects only the records where the value of the DOES NOT MATCH any of the values specified after IN keyword |
Conditional Expressions
- Each conditional operator mentioned in the above table returns a TRUE/FALSE value
- Build your own logic by joining multiple conditional operators using logical operators –
- AND
- OR
- NOT
- Use Apex variables for comparison in your SOQL query by adding a colon (:) before the variable name
Aggregate Queries
- Use aggregate queries to perform the following aggregate functions on the result set –
- COUNT
- SUM
- AVERAGE
- MIN
- MAX
- Specify the field name to perform aggregation against that field in the result set
GROUP BY and HAVING Clauses
- Use the GROUP BY clause to group the result set based on the field specified
- HAVING is an optional clause used to filter the results that an aggregated function returns
- Difference between HAVING and WHERE clause is that you can use aggregated function in HAVING, but not in WHERE.
Writing SOQL in Apex
- SOQL query always returns a List. In Apex, create a List for the object specified in the query
- Always store the query result in a List and not a single instance
- Use for…loop for iterating over the results of a SOQL query
- Can directly write query in a for…loop for better performance
Writing SOQL in Apex
DML Operations
•Apex allows DML operations on both List<SObject> and single SObject to update data in the database
| DML Operation | Usage |
| insert [SObject | List<SObject>] | Insert a new record or a list of records |
| update [SObject | List<SObject>] | Update existing records with the new data specified. Existing records are matched using the ID |
| delete [SObject | List<SObject>] | Delete records with the matching ID from the database |
| upsert [SObject | List<SObject>] | Performs both insert/update on the specified records. If record ID matches, then it updates the record. Otherwise it inserts a new record |
| merge SObject1 SObject2 | Merges up to three records of the same SObject into a single record |
| undelete [SObject | List<SObject>] | Retrieves a record or list of records previously deleted from recycle bin |
Database Methods
| DML Operation | Equivalent Database Method |
| insert [SObject | List<SObject>] | Database.insert([SObject|List<SObject>], [Boolean allOrNone]); |
| update [SObject | List<SObject>] | Database.update([SObject|List<SObject>], [Boolean allOrNone]); |
| delete [SObject | List<SObject>] | Database.delete([SObject|List<SObject>], [Boolean allOrNone]); |
| upsert [SObject | List<SObject>] | Database.upsert([SObject|List<SObject>], [Boolean allOrNone]); |
| merge SObject1 SObject2 | Database.merge([SObject|List<SObject>], [SObject|List<SObject>], [Boolean allOrNone]); |
| undelete [SObject | List<SObject>] | Database.undelete([SObject|List<SObject>], [Boolean allOrNone]); |
Recording
Basic of SOQL and SOSL in Salesforce | Query Plan| DAY 4 Part
Data Manipulation and Error Handling in Salesforce | DML | DAY 4 Part 2
Further Learning
- Apex Basics & Database
- Search Solution Basics
Assignment
Complete below assignment to win $1000 Salesforce Voucher. Click here for rule.
| 1.Write a method to insert an Account record. Also insert five related contacts to that same account. 2.Write a SOQL query to fetch the contact records that were inserted in previous question. (Hint: Use the CreatedDate field to add filter) 3.Write a query on Contact object and fetch the Account details. Use child to parent relationship query. 4.Write a query on Account object and fetch the related contacts. Use the parent to child relationship query. |
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Completed Day 4 assignment
Done with assignment 4
Episode 4 – Querying & Manipulating Salesforce Data Assignment Completed!
Completed assignment for Day 4 (I have created one class “ApexHourAssignmentDay4” and 4 methods)
Day 4 Assignment is completed!
Day 4 Assignment is completed
Day 4 – Assignment is completed.
Completed Day 4 Assignment
Day 4: Assignment done
Completed Day 4 assignment
Assignment 4 completed
Assignment 4 completed
Assignment 4 completed
Can you please add the additional link provided by the speaker.
We will upload all link and required detail soon
Assignment 4 completed
Assignment 4 Completed
Completed Day 4 Assignment
Completed AssignmentDay 4.
Solution : All 4 steps in one method – >
public class MyAccountActions {
public MyAccountActions ( ) { } // Constructor
public static void createAccount ( ) {
Account acc = new Account ( Name = ‘ApexTestAccount ‘);
insert acc;
List listContact = new List();
for ( integer i =1; i
List result = [ SELECT Id, Name FROM Contact WHERE CreatedDate = TODAY ];
System.debug(‘Result of query1:’+ result);
for(Contact conlist : result){
System.debug(conlist.Name);
}
// Query 2 –>
List conList2 = [ SELECT Name,Account.Name FROM Contact];
System.debug(‘Result of query2:’+ conList2);
// Query 3 –>
List accList = [ SELECT Name, ( SELECT ID, Name FROM Contacts ) from Account ];
System.debug(‘Result of query3:’+ accList);
}
}
Please ignore above Solution, some lines got deleted by mistake. I am sorry about it.
Solution: All 4 steps in one class
public class MyAccountActions {
public MyAccountActions () { } // Constructor
public static void createAccount ( ) {
Account acc = new Account(Name = ‘ApexTestAccount’);
insert acc;
List listContact = new List();
for ( integer i =1; i<=5; i++ ) {
Contact con = new Contact(FirstName = 'Apex', LastName = 'Contact' + i, AccountId = acc.Id);
listContact.add(con);
}
insert listContact;
system.debug('New account =' + acc);
List result = [ SELECT Id, Name FROM Contact WHERE CreatedDate = TODAY ];
System.debug(‘Result of query1:’+ result);
for(Contact conlist : result){
System.debug(conlist.Name);
}
List conList2 = [ SELECT Name,Account.Name FROM Contact];
System.debug(‘Result of query2:’+ conList2);
List accList = [ SELECT Name, ( SELECT ID, Name FROM Contacts ) from Account ];
System.debug(‘Result of query3:’+ accList);
}
}
Code for Assignment Day 4
——————————–
public class ApexHourAssignmentDay4 {
public void insertAccountAndContacts() {
Account acc = new Account();
acc.Name=’Apex Hour Day 4 Account’;
insert acc;
System.debug(‘Account Record has ben created:’ + acc.Name);
List listContacts = new List();
for(Integer i=1;i<=5;i++) {
Contact contact = new Contact();
contact.FirstName = 'Apex';
contact.LastName = ' Contact' + i;
contact.AccountId = acc.Id;
listContacts.add(contact);
}
insert listContacts;
System.debug('Contacts Records has been created:' + listContacts);
}
public void getRecentlyCreatedContacts(){
List listContacts = new List();
listContacts = [select Id,Name from Contact where createdDate = today];
for(Contact contact : listContacts) {
system.debug(‘Contact Name:’ + contact.name);
}
}
public void getContactswithAccount(){
List listContacts = new List();
listContacts = [select Id,Name,Account.Name from Contact];
for(Contact contact : listContacts) {
system.debug(‘Account Name:’ + contact.Account.Name);
system.debug(‘Contact Name:’ + contact.name);
}
}
public void getAccountwithContacts(){
List listAccounts = new List();
listAccounts = [select Id,Name, (select Id,Name from Contacts) from Account];
for(Account account : listAccounts){
system.debug(‘Account Name:’ + account.Name);
for(Contact contact : account.Contacts) {
system.debug(‘Contact Name:’ + contact.Name);
}
}
}
}
In Developer Console –> Open Execute Anonymous Window
————————————————————————
ApexHourAssignmentDay4 day4 = new ApexHourAssignmentDay4();
day4.insertAccountAndContacts();
day4.getRecentlyCreatedContacts();
day4.getContactswithAccount();
day4.getAccountwithContacts();
Great lecture thank you. Where can I get the Powerpoint?