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If we rerun the DemoSavepoint program, we ll get an error since we re trying to reinsert the same value in column x of table t1, which is a primary key: B:\code\book\ch04>java DemoSavepoint ora10g URL:jdbc:oracle:thin:@(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(PORT=1521)(HOST=rmeno n-lap))(CONNECT_DATA=(SID=ora10g))) Exception in thread "main" java.sql.SQLException: ORA-00001: unique constraint ( BENCHMARK.SYS_C005868) violated ... When we execute a select from the tables t1 and transaction_log, we get the following: benchmark@ORA10G> select * from transaction_log; TXN_NAME LOG_MESSAGE -------------- -----------------------------demo_savepoint Failed with error: ORA-00001: unique constraint (BENCHMARK.S YS_C005868) violated demo_savepoint starting the txn to demo savep oints at: Wed Dec 29 00:26:16 PST 2004 demo_savepoint Successfully ended at: Wed Dec 29 00:26:16 PST 2004 demo_savepoint starting the txn to demo savep oints at: Wed Dec 29 00:29:33 PST 2004

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be listed in multiple classes! As the code walks up the inheritance hierarchy, it could end up processing those fields twice. To avoid this, the code only looks at the fields that directly belong to the class currently being processed: foreach(FieldInfo field in fields) { // make sure we process only our variables if(field.DeclaringType == currentType)

Reports to some extent resemble forms in that they contain methods, data sources, and a design actually a report design. However, unlike forms, reports are not used to work with data but rather to output data in hardcopy. Normally, reports are also intended for summarizing or aggregating data for supporting business decisions and analysis.

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benchmark@ORA10G> select * from t1; X ---------1 2 3 As you can see, the failure messages in transaction_log were also logged as required. Note that from a coding perspective, re-executing the statements before the savepoint may not be an issue, but doing so may be undesirable from a performance standpoint if these statements do a lot of work. Without savepoints, you may be potentially undoing a lot of work, only to redo it immediately afterward.

At this point in the proceedings, it has been established that the current FieldInfo object refers to a field within the object that s part of the current class in the inheritance hierarchy. However, a snapshot of the field should only be taken if it doesn t have the [NotUndoable()] attribute: // see if this field is marked as not undoable if(!NotUndoableField(field)) Having reached this point, it is clear that the field value needs to be part of the snapshot, so there are two possibilities: this may be a regular field or it may be a reference to a child object that implements Csla.Core.IUndoableObject.

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Note Actually, there is a little twist with the data sources of a report, and that is it actually contains a single query that is used to retrieve the data with which to populate the report.

Summary

If the field is a reference to a Csla.Core.IUndoableObject, the CopyState() call must be cascaded to that object, so that it can take its own snapshot: if (typeof(Csla.Core.IUndoableObject). IsAssignableFrom(field.FieldType)) { // make sure the variable has a value if (value != null) { // this is a child object, cascade the call ((Core.IUndoableObject)value).CopyState(); } } If an object were to reach into another object and manipulate its state, it would break encapsulation. Instead, it is up to that other object to manage its own state. By cascading the CopyState() call to the child object, it is up to that child object to take a snapshot of its own state. Keep in mind that if the child object is derived from BusinessListBase, the call will automatically be cascaded down to each individual child object in the collection.

When you select the ReportDesign node of a report, you don t create a new control, but instead generate a new design, of which there can be only one per report.

In this chapter, we briefly covered transactions, the different transaction isolation levels available, and the transaction isolation levels supported by Oracle. We discussed why we should commit a transaction based on business need, rather than on the amount of resources the transaction consumes. As you learned, breaking your transaction into smaller chunks with intermittent commits can lead to compromised data integrity, increased code complexity, and an overall slower system. You learned the importance of always turning off autocommit and explicitly executing a commit or rollback as required to end your transaction. You also examined transaction savepoints as applicable to JDBC applications, and you saw a use case illustrating savepoints. In the next two chapters, we will look at statements that enable you to do all the work within your transaction.

Of course, the GetValue() method returns everything as type object, so the result is casted to Csla. Core.IEditableObject in order to call the method.

Note When you create a report, it automatically generates a default design called AutoDesignSpecs, used

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