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In theory, a timestamp is slightly less safe, because two concurrent transactions may both load and update the same item in the same millisecond; in practice, this won t occur because a JVM usually doesn t have millisecond accuracy (you should check your JVM and operating system documentation for the guaranteed precision). Furthermore, retrieving the current time from the JVM isn t necessarily safe in a clustered environment, where nodes may not be time synchronized. You can switch to retrieval of the current time from the database machine with the source="db" attribute on the <timestamp> mapping. Not all Hibernate SQL dialects support this (check the source of your configured dialect), and there is always the overhead of hitting the database for every increment. We recommend that new projects rely on versioning with version numbers, not timestamps. Optimistic locking with versioning is enabled as soon as you add a <version> or a <timestamp> property to a persistent class mapping. There is no other switch. How does Hibernate use the version to detect a conflict Automatic management of versions Every DML operation that involves the now versioned Item objects includes a version check. For example, assume that in a unit of work you load an Item from the database with version 1. You then modify one of its value-typed properties, such as the price of the Item. When the persistence context is flushed, Hibernate detects

Importantly, read-ahead processing opens the door for overlapping read and write requests at the hardware level..

that modification and increments the version of the Item to 2. It then executes the SQL UPDATE to make this modification permanent in the database:

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If another concurrent unit of work updated and committed the same row, the OBJ_VERSION column no longer contains the value 1, and the row isn t updated Hibernate checks the row count for this statement as returned by the JDBC driver which in this case is the number of rows updated, zero and throws a StaleObjectStateException The state that was present when you loaded the Item is no longer present in the database at flush-time; hence, you re working with stale data and have to notify the application user You can catch this exception and display an error message or a dialog that helps the user restart a conversation with the application What modifications trigger the increment of an entity s version Hibernate increments the version number (or the timestamp) whenever an entity instance is dirty.

Configure permissions with the Windows Server 2003 ACL editor Manage ACL inheritance Evaluate resulting, or effective permissions Verify effective permissions Change ownership of files and folders Transfer ownership of files and folders

This includes all dirty value-typed properties of the entity, no matter if they re single-valued, components, or collections Think about the relationship between User and BillingDetails, a one-to-many entity association: If a CreditCard is modified, the version of the related User isn t incremented If you add or remove a CreditCard (or BankAccount) from the collection of billing details, the version of the User is incremented If you want to disable automatic increment for a particular value-typed property or collection, map it with the optimistic-lock="false" attribute The inverse attribute makes no difference here Even the version of an owner of an inverse collection is updated if an element is added or removed from the inverse collection As you can see, Hibernate makes it incredibly easy to manage versions for optimistic concurrency control.

The SOAP request includes a query that returns employee data as an XML stream for a particular employee. Because the employee ID needs to be passed in as a parameter for the query, the <Parameters> element is included. Enabling batches for an endpoint enables users to execute any query against the database. This enables them to get data beyond what is returned from the Web method assigned to the endpoint. Essentially, they are able to execute any query allowed by the SQL Server permissions. If you decide to enable batches for HTTP endpoints, ensure that the user accounts accessing those endpoints have proper permissions assigned.

If you re working with a legacy database schema or existing Java classes, it may be impossible to introduce a version or timestamp property and column Hibernate has an alternative strategy for you Versioning without version numbers or timestamps If you don t have version or timestamp columns, Hibernate can still perform automatic versioning, but only for objects that are retrieved and modified in the same persistence context (that is, the same Session) If you need optimistic locking for conversations implemented with detached objects, you must use a version number or timestamp that is transported with the detached object..

Windows Explorer is the most common tool used to initiate management of resource access permissions, both on a local volume as well as on a remote server. Unlike shared folders, Windows Explorer can configure permissions locally and remotely.

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