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The following page has been changed by KevinWilliams: http://wiki.apache.org/ws/Tuscany/TuscanyJava/DAS_Java_Overview/RDBDAS_Java_User_Guide/Write_Operation_Ordering ------------------------------------------------------------------------------ = Write Operation Ordering = + Relational databases often use [http://en.wikipedia.org/wiki/Referential_integrity Referential Integrity (RI)] constraints to maintain database consistency. When RI is enabled, database operations must be performed in a specific order that prevents invalid references. If this order is not adhered to then the database will throw an exception rather than let the write succeed. - Relational databases often use [http://en.wikipedia.org/wiki/Referential_integrity Referential Integrity (RI)] constraints to maintain database consistency. When using RI, database operations must be performed in an order that prevents invalid references. The order in which deletes, updates, and inserts are performed in an object model may not match the order required by the database. + When an application makes modifications to a data graph and then asks the RDB DAS to "apply changes", the DAS will create a "batch" of database writes that must be sorted and the executed in the correct order to avoid RI Contraint exceptions. A simple example will help here. Assume a database with two tables CUSTOMER and ORDER. Also assume that the ORDER table has a [http://en.wikipedia.org/wiki/Foreign_key foreign key] reference to --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
