Apex Developer Guide
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Release Notes
How DML Works
Adding and Retrieving Data With DML
DML Statements vs. Database Class Methods
DML Operations As Atomic Transactions
Setting DML Options
Transaction Control
sObjects That Don’t Support DML Operations
Bulk DML Exception Handling
Things You Should Know about Data in Apex
SOQL For Loops
Custom Settings
Apex Reference
More About DML
Here are some things you may want to know about using Data Manipulation Language.
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Setting DML Options
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Transaction Control
Read about transaction requests, generating and releasing savepoints, rolling back transactions, and more. -
sObjects That Can’t Be Used Together in DML Operations
DML operations on certain sObjects, sometimes referred to as setup objects, can’t be mixed with DML on non-setup sObjects in the same transaction. This restriction exists because some sObjects affect the user’s access to records in the org. You must insert or update these types of sObjects in a different transaction to prevent operations from happening with incorrect access-level permissions. For example, you can’t update an account and a user role in a single transaction. -
sObjects That Don’t Support DML Operations
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Bulk DML Exception Handling
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Things You Should Know about Data in Apex