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So, you have to provide at least one constructor to stop the compiler from adding a constructor, and make it private so that no other code can call the constructor Now, anyone who wants a JDBC resource can get it from your class, and they cannot create an instance of this class, but can only call the static methods The class then has three methods that return connection objects to the caller At the moment, these three methods are simply a pass-through to the similar methods of javasqlDriverManager Although they have no behavior of their own at this time, we will modify these methods later in the chapter to give them a little behavior Finally, the class includes the close() method for the connection As I mentioned above, it is important to release database resources as soon as you no longer need them.



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... } } If you run the application again, thread 2 won t be able to update the book stock until thread 1 has committed the transaction. In this way, the non-repeatable read problem can be avoided by preventing a transaction from updating a value that has been read by another uncommitted transaction. Thread Thread Thread Thread Thread Thread Thread Thread Thread 1 1 1 2 1 2 2 2 2 Prepare to Book stock Sleeping Prepare to Wake up Book stock Sleeping Wake up Book stock check book stock is 10 increase book stock increased by 5





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Usually, what you will see in an application is that there are try..catch blocks surrounding method calls to the close() method of the connection in every class that does some JDBC work Again, we want to avoid code duplication, so we put a close(Connection) method inside the DriverLoader class This way, there is one central class that can close connections, it tests for null before attempting to close the connection, and when used properly, the application code does not need to be littered with duplicate try..catch blocks The DriverLoader class is simple to use Assuming the system property jdbcdrivers is set, you call one of the getConnection() methods to get a connection, and call close(Connection) when you are finished with the connection getConnection() calls the same named method in driver manager, and driver manager automatically loads the driver before it returns the first Connection object.

CHAPTER 7 GREED IS GOOD PROVE IT!

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The JDBCClient class shows how to use the DriverLoader class It consists of a single static main() method in which all the code executes We start by assigning the URL string to a variable Note that for a real application, you should not hard-code the URL into the class, but rather pass it in as a String using the command line, or prompt the user for it, or some other technique Here is the URL:.

In order that the underlying database can support the REPEATABLE_READ isolation level, it may acquire a read lock on a row that was read but not yet committed. Then other transactions must wait to update the row until the read lock is released, which happens when the locking transaction commits or rolls back. The SERIALIZABLE Isolation Level After a transaction has read several rows from a table, another transaction inserts new rows into the same table. If the first transaction reads the same table again, it will find additional rows that are different from the first read. This problem is known as phantom read. Actually, phantom read is very similar to non-repeatable read, but involves multiple rows. To avoid the phantom read problem, you should raise the isolation level to the highest: SERIALIZABLE. Notice that this isolation level is the slowest, as it may acquire a read lock on the full table. In practice, you should always choose the lowest isolation level that can satisfy your requirements. Setting the Isolation Level Attribute in Transaction Advices, Proxies, and APIs In a Spring 2.x transaction advice, the isolation level can be specified in the <tx:method> element as follows: <tx:advice ...> <tx:attributes> <tx:method name="..." isolation="REPEATABLE_READ" /> </tx:attributes> </tx:advice> In classic Spring AOP, the isolation level can be specified in the transaction attributes of TransactionInterceptor and TransactionProxyFactoryBean as follows:

String url = "jdbc:pointbase:server://localhost/pointbaseDB,new";

of the chapter, I ll sum up some general approaches to proving correctness that you can use for other problems.

If your PointBase server is running on some other machine, you will need to replace localhost with the correct name or IP address for the server.

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