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Activity › Forums › Salesforce® Discussions › How to lock record using SOQL in Salesforce?

  • Aman

    Member
    July 17, 2017 at 2:21 PM

    Hello Saloni,

    In Apex, you can use FOR UPDATE to lock sObject records while they’re being updated in order to prevent race conditions and other thread safety problems.
    While an sObject record is locked, no other client or user is allowed to make updates either through code or the Salesforce user interface. The client locking the records can perform logic on the records and make updates with the guarantee that the locked records won’t be changed by another client during the lock period. The lock gets released when the transaction completes.

    To lock a set of sObject records in Apex, embed the keywords FOR UPDATE after any inline SOQL statement. For example, the following statement, in addition to querying for two accounts, also locks the accounts that are returned
    Account [] accts = [SELECT Id FROM Account LIMIT 2 FOR UPDATE];

    While the records are locked by a client, the locking client can modify their field values in the database in the same transaction. Other clients have to wait until the transaction completes and the records are no longer locked before being able to update the same records. Other clients can still query the same records while they’re locked.

     

     

  • Parul

    Member
    September 19, 2018 at 7:01 PM

    use this trigger to lock the record:

    Ex:

    trigger OppTrigger on Opportunity (after insert, before update) {
    Map<String, Id> typeMap = New Map<ID,RecordType>();
    for(RecordType rt: [Select ID, DeveloperName From RecordType Where sObjectType = 'Opportunity']) {
    typeMap.put(rt.DeveloperName, rt.id);
    }
    for (Opportunity opp : trigger.new) {
    // And the Agreement Category on the record = TEST
    if (opp.Stage__c == 'Negotiation/Review') {
    // Then automatically change the Record Type to ReadOnly RecordType
    opp.RecordTypeID = typeMap.get('ReadOnly

    }

    }

    }

     

    Thanks

  • shariq

    Member
    September 19, 2018 at 10:52 PM

    Hi,

    Try this -

    Account [] accts = [SELECT Id FROM Account LIMIT 2 FOR UPDATE];

    Locking Considerations
    While the records are locked by a client, the locking client can modify their field values in the database in the same transaction. Other clients have to wait until the transaction completes and the records are no longer locked before being able to update the same records. Other clients can still query the same records while they’re locked.
    If you attempt to lock a record currently locked by another client, your process waits for the lock to be released before acquiring a new lock. If the lock isn’t released within 10 seconds, you will get a QueryException. Similarly, if you attempt to update a record currently locked by another client and the lock isn’t released within 10 seconds, you will get a DmlException.
    If a client attempts to modify a locked record, the update operation might succeed if the lock gets released within a short amount of time after the update call was made. In this case, it is possible that the updates will overwrite those made by the locking client if the second client obtained an old copy of the record. To prevent this from happening, the second client must lock the record first. The locking process returns a fresh copy of the record from the database through the SELECT statement. The second client can use this copy to make new updates.
    When you perform a DML operation on one record, related records are locked in addition to the record in question.

    Hope this helps.

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