Purpose: An implementation of the OptimisticLockingPolicy interface. This policy compares only the changed fields in the WHERE clause when doing an update. If any field has been changed, an optimistic locking exception will be thrown. A delete will only compare the primary key.
Note
This policy can only be used inside a unit of work.
| Access | Constructor and Description |
|---|---|
| public |
| ChangedFieldsLockingPolicy | back to summary |
|---|---|
| public ChangedFieldsLockingPolicy() PUBLIC: Create a new changed fields locking policy. This locking policy is based on locking on all changed 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. Without a unit of work, there is no way for to know what the original values were without the back up clone in the unit of work. | |
| addLockValuesToTranslationRow | back to summary |
|---|---|
| public void addLockValuesToTranslationRow(ObjectLevelModifyQuery query) Implements abstract org. Implements org. INTERNAL: Values to be included in the locking mechanism are added to the translation row. For changed fields the normal build row is ok as only changed fields matter.
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| buildDeleteExpression | back to summary |
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| public Expression buildDeleteExpression(DatabaseTable table, Expression mainExpression, AbstractRecord row) Overrides org. Implements org. INTERNAL: When given an expression, this method will return a new expression with the optimistic locking values included. The values are taken from the passed in database row. This expression will be used in a delete call. No new criteria will be added for changed fields.
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| getFieldsToCompare | back to summary |
|---|---|
| protected List Implements abstract org. INTERNAL: Returns the fields that should be compared in the where clause. In this case, it is only the fields that were changed.
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