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Because hashing is irreversible, it can t be used to store or transfer information. But it is an excellent method of error detection, in which case it can reveal whether a chunk of data is or is not what was expected. If, as in the case of passwords, the content of the data is in fact less important than its integrity, such functions are very useful.

5: Return this HTML code to the Javascript. Hopefully it should replace the HTML code for the answer.

In general, regardless of whether we re talking about database organization, table structure, or actual data, you ll need to perform four basic operations: create, retrieve, update, and delete (CRUD). The corresponding SQL statements begin with a keyword that identifies the operation (e.g., INSERT, SELECT, UPDATE, or DELETE), followed when necessary by a keyword

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The Message Digest (MD) algorithm, developed by the same Ron Rivest who was a key player in the creation of RSA encryption, was defined in 1992 in RFC 1321 (available at http://www.ietf.org/rfc/rfc1321.txt) as a means to calculate a 128-bit digest of any message of arbitrary length. It was designed to be extremely fast computationally, as indeed it is. Currently version 5 of the algorithm is in widespread usage. As is typical of hashing algorithms, MD5 is most adept at data verification, more secure than the simple integer produced by CRC32 but still relatively small (the 128bit digest itself is usually represented by a 32-digit hexadecimal number) and thus manageable. An unofficial MD5 homepage is at http://userpages.umbc.edu/~mabzug1/cs/md5/md5.html. Earlier in this chapter we discussed just how huge a 128-bit number actually is, and it would seem that such a digest length would easily provide adequate security. But a collision (that is, two different messages producing the same digest) was found as early as 1996, and by 2004 the number of brute-force attempts required to produce a collision had been lowered all the way to 2^40 in cases where the value being hashed is known to an attacker (as with digital signatures). So the cryptography community is now recommending that other algorithms be used. MD5 is still a fast and powerful and relatively secure method, and PHP s md5() function makes the algorithm extremely easy to use, but, given the annual increases in computing power that foster quicker cracking of codes, it seems to us not wise to use it for anything important that is expected to last for ten years or so.

Figure 7 3. How Ajax works However, there is still a problem: how does the JavaScript know which part of the page to update To solve this problem, you need to explicitly assign an ID to the com ponent being refreshed (the UI Output component in this case), as shown in Figure 7 4. This will cause the component to generate an HTML element with a client ID. Then the JavaScript can use the client ID to look up the existing HTML element and replace it.

specifying on what type of entity the operation is to be performed (e.g., DATABASE, TABLE, or INDEX) and by additional elements. You use the SELECT statement for retrieving information. You can create databases, tables, and indexes with the CREATE statement, update them with ALTER, and delete them with DROP. Similarly, you can create and delete views with CREATE and DROP, but you cannot update them once you ve created them. You use INSERT to create new rows within a table, and you use DELETE to delete them. The UPDATE statement lets you modify entire rows or one or more individual fields within them. That said, you won t find anything about ALTER DATABASE and ALTER INDEX in this appendix, because there is very little you can update in a database or an index definition once you ve created them, and there is no agreement among DBMS vendors. Table E-2 shows a summary of the possible combinations of keywords. Table E-2. SQL Keywords to Create, Update, and Delete

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In many applications, the structure of databases, tables, indexes, and views, once initially defined, remains unchanged. Therefore, you ll often need within your applications only the statements operating on rows and fields. In any case, you ll certainly need SELECT, which you use to interrogate databases both in terms of their structure and the data they contain. Finally, to complete the list of statements you re likely to need when developing applications, we ll also describe START TRANSACTION, COMMIT, and ROLLBACK. SQL interprets all text enclosed between /* and */ as comments and ignores it.

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