Apex DML

Apex DML refers to the Data Manipulation Language statements used in Apex programming language. These statements are used to interact with data in the Salesforce database. Using Apex DML, you can insert, update, delete, and upsert records.

Insert

The insert statement is used to add new records to the database. Here's an example:

Account a = new Account();
a.Name = 'Acme';
a.Industry = 'Technology';
insert a;

In this example, we create an Account object, set its fields, and insert it into the database using the insert statement.

Update

The update statement is used to modify existing records in the database. Here's an example:

Account a = [SELECT Id, Name, Industry FROM Account WHERE Id = '001xxxxxxxxxxxx'];
a.Name = 'Acme, Inc.';
update a;

In this example, we retrieve an Account object from the database, modify its Name field, and update it in the database using the update statement.

Delete

The delete statement is used to remove existing records from the database. Here's an example:

Account a = [SELECT Id, Name, Industry FROM Account WHERE Id = '001xxxxxxxxxxxx'];
delete a;

In this example, we retrieve an Account object from the database and delete it using the delete statement.

Upsert

The upsert statement is used to insert or update records based on a specified external ID field. Here's an example:

Account a = new Account();
a.Name = 'Acme';
a.Industry = 'Technology';
a.External_Id__c = '123456789';
upsert a External_Id__c;

In this example, we create an Account object, set its fields, and upsert it into the database using the upsert statement based on the External_Id__c field.

Conclusion

Apex DML statements are essential for interacting with data in the Salesforce database. By using insert, update, delete, and upsert statements, you can manipulate records to suit your business requirements.