Class AllFieldsLockingPolicy

  • All Implemented Interfaces:
    Serializable, Cloneable, org.eclipse.persistence.internal.descriptors.OptimisticLockingPolicy

    public class AllFieldsLockingPolicy
    extends FieldsLockingPolicy

    Purpose: An implementation of the OptimisticLockingPolicy interface. This policy compares every field in the table in the WHERE clause when doing an update or a delete. If any field has been changed, an optimistic locking exception will be thrown.

    NOTE: This policy can only be used inside a unit of work.

    See Also:
    Serialized Form
    Author:
    Peter Krogh
    Since:
    TopLink 2.1
    • Constructor Detail

      • AllFieldsLockingPolicy

        public AllFieldsLockingPolicy()
        PUBLIC: Create a new all fields locking policy. A field locking policy is based on locking on all fields by comparing with their previous values to detect field-level collisions. Note: the unit of work must be used for all updates when using field locking.
    • Method Detail

      • addLockValuesToTranslationRow

        public void addLockValuesToTranslationRow​(ObjectLevelModifyQuery query)
        INTERNAL: Values to be included in the locking mechanism are added to the translation row. Set the translation row to all the original field values.
        Specified by:
        addLockValuesToTranslationRow in interface org.eclipse.persistence.internal.descriptors.OptimisticLockingPolicy
        Specified by:
        addLockValuesToTranslationRow in class FieldsLockingPolicy
      • getFieldsToCompare

        protected List<org.eclipse.persistence.internal.helper.DatabaseField> getFieldsToCompare​(org.eclipse.persistence.internal.helper.DatabaseTable table,
                                                                                                 org.eclipse.persistence.internal.sessions.AbstractRecord transRow,
                                                                                                 org.eclipse.persistence.internal.sessions.AbstractRecord modifyRow)
        INTERNAL: Returns the fields that should be compared in the where clause. In this case, it is all the fields, except for the primary key and class indicator.
        Specified by:
        getFieldsToCompare in class FieldsLockingPolicy