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Learning Force.com Application Development
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DML statements allow users to retrieve, insert, delete, and update sObject data in the Force.com database. Apex has a set of DML commands, as follows, which can take a single sObject or a list of sObjects:
insert
: This command is used to add records to the particular Force.com database object. The ID is automatically generated for a record while executing this command.
update
: This command is used to update fields of an existing record in the Force.com database object. The update is based on the ID of the particular record.
upsert
; Based on the ID field, this command can either insert or update the particular records. If the record has a value for the ID field, then the record will be updated, and if the record doesn't have a value for the ID field, the record will be inserted.
delete
: This command is used to delete records from the Force.com database based on the ID of the record. If any record is adhered to cascade deleting (such as a master-detail...
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