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Security is another area that depends on the type of embedding performed. If the system is built using server embedding, addressing security concerns can be quite challenging. This is true because the MySQL system is still accessible from the local server using the normal set of tools. It may be very difficult to lock this type of embedded system down completely. Platform embedding is a lot easier because the embedded stand-alone MySQL system is only accessible through the embedded application. Unless the embedded application developers have a maladjusted ethical compass, they will have taken steps to ensure proper credentials are necessary to access the administration capabilities. Deeply embedded systems present the most difficult case for protecting the data. The embedded MySQL system may not have any password set for it (they typically do not), because like platform embedding they require the user to use the interface provided to access the data. Unfortunately, it isn t that simple. In many cases, the data is placed in directories that are accessible by the user. Indeed, the data needs to be accessible to the user; otherwise, how would she be able to read the data That s the problem. The data files are unprotected and could be copied and accessed using another MySQL installation. This isn t limited to just the embedded server, but it is also a problem for the stand-alone server. Is that shocking It could be if your organization has a limitation of tight control on the use of open source software. Imagine the look on your information assurance officer s face when he finds out. OK, so you might want to break it to him gently. Therefore, it may require additional security features included in the embedded application to protect the embedded MySQL system and its data appropriately.

So far we have worked with methods like credit() that contain simple transactions. Methods like these do not need to be concerned with updates to the database that occur in other methods. However, we must also handle nested transactions, in which the updates issued to the database from within the method

The MySQL embedded API enables developers to use a full-featured MySQL server inside another application. The most important benefits are increased speed of data access (since the server is either part of or runs on the same hardware as the application), built-in database management tools, and a very flexible storage and retrieval mechanism. These benefits allow developers the opportunity to incorporate all of the benefits of using MySQL while hiding its implementation from the users. This means developers can increase the capabilities of their own products by leveraging the features of MySQL.

checkmark. Click once in the check box to add a black checkmark (see Figure 8-2).

have to be coordinated with database updates from other methods. Before we delve into the implementation of transaction management, we will use InterAccountTransferSystem (from listing 10.4) to help us understand nested transactions. The InterAccountTransferSystem class consists of just one method that allows us to transfer money from one account to another. We call this a nested transaction because transactional integrity requires that both the individual operations invoked credit() and debit() succeed or the changes to the database are rolled back. For example, when the credit() method is called directly, it commits its changes before returning. Yet the same method called from InterAccountTransferSystem.transfer() must not commit the changes in the credit() method, but rather wait for successful completion of the debit() method that follows. Because the transactions taking place inside the credit() and debit() methods are nested inside the transaction of the InterAccountTransferSystem.transfer() method, they are called nested transactions. 11.1.2 Setting up the test scenario To test the solution, let s use the simple Test class in listing 11.3, which is nearly identical to one developed in chapter 10 (listing 10.5) except that we instantiate AccountJDBCImpl instead of AccountSimpleImpl. We will use the same scenario throughout this chapter.

There are some limitations of using the embedded MySQL server. Fortunately, it is a short list. Most of the limitations make sense and are not normally an issue for system integrators. Table 6-1 lists the known limitations of using an embedded MySQL system. Included with each is a brief description.

package banking; public class Test { public static void main(String[] args) throws Exception { Account account1 = new AccountJDBCImpl(1); Account account2 = new AccountJDBCImpl(2); account1.credit(300); account1.debit(200);

Protecting the Worksheet 1. Choose Tools Protection Protect Sheet. 2. If desired, enter a password.

Security Replication External Access Installation Data Version UDF Debug/Trace Connectivity Resources

InterAccountTransferSystem.transfer(account1, account2, 100); InterAccountTransferSystem.transfer(account1, account2, 100); } }