Sometimes we need to write some data into a database independently on the currently running DB transaction. For example, we want to log some state occurred in the application, however any exception could cause a rollback of the whole transaction, including the log entry. It could look as follows:
LogTable logTable; ; ttsbegin; logTable.Message = "Something happens"; logTable.insert(); //some following code in the same transaction throws an exception throw Exception::Error; ttscommit;
It can be resolved quite easily. We need to create a separate database connection and possibly our own transaction. The modification of the preceding code would look as follows:
LogTable logTable; UserConnection connection = new UserConnection(); ; ttsbegin; //use another connection logTable.setConnection(connection); //beginning of the independent transaction logTable.ttsbegin(); logTable.Message = "Something happens"; logTable.insert(); logTable.ttscommit(); //this exception doesn't affect the logTable entry throw Exception::Error; ttscommit;
