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When we run SQL statements interactively in SQL*Plus or SQL Developer or another utility, we decide how to react to an error. If a SQL statement fails from a syntax error or from an unexpected data condition such as ORA-01403: no rows found, do we want to proceed and run the next SQL statement, or do we want to simply roll back all work that has been done and exit When executing interactively, we can decide interactively. But what about when we re running a script SQL*Plus provides the WHENEVER command to direct SQL*Plus how to react to failures. WHENEVER is particularly useful when running a script. Table 11-7 describes two variations of the command. Table 11-7. WHENEVER Error-Handling Conditions

In addition to being portable and maintainable, J2ME needs to be extendible As new devices come onto the market, J2ME needs to be able to quickly adapt and support these devices..

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Google originated a value of relative search engine importance, called page rank. Each individual web page (pages within a site can vary) is assigned a number from 0 to 10. The 0 value simply means that Google has not yet indexed the page. New pages often have a rank of 2 or 3, while larger, well-established sites are generally in the 6 to 9 range. To get a very rough approximation of a web site s general search ranking, you can install Google Toolbar (see Figure 12-9). While page ranking is not useful for any precision evaluation of a web site value, it will allow you to get a feel for how important the web site is in the Internet sphere.

One of the key problems that the J2ME architecture attempts to solve is how to support a wide range of devices with different constraints, capabilities, features, and intended uses without introducing limitations on any specific device.

Triggers whenever a SQL*Plus command like CONNECT, DISCONNECT, SPOOL, HOST, START, or any other command which interacts with the operating system fails. Triggers whenever a SQL statement like SELECT, INSERT, UPDATE, DELETE, CREATE, ALTER, DROP, TRUNCATE, GRANT, REVOKE, or any other SQL command fails.

When Google first released the page ranking system, optimizers recognized the assigned value as very important. Nowadays, with all the other valuation methods used by search engines, it has become less important. However, it still provides an excellent general assessment of a page s popularity on Google. It can therefore be used in a rough manner to evaluate the popularity of your own site, as well as other associated or competitive sites.

One solution might be to create a large, monolithic architecture that includes everything any application would ever need on any given device However, such an architecture would be too large in terms of memory footprint for some of the smaller devices J2ME is intended to support, such as a two-way pager or a cell phone Another solution might be to identify a common denominator of functionality that applies to all devices in the J2ME space The problem with this approach is that powerful devices then become as limited as the smallest devices Furthermore, the unique features of devices cannot be adequately supported.

Both of the commands in Table 11-7 have two possible directives: EXIT and CONTINUE. Each directive, in turn, implements two further directives describing how to handle an open transaction and (if necessary) what exit status to return to the operating system. Table 11-8 describes the options that you can pass to EXIT and CONTINUE. Table 11-8. WHENEVER Error-Handing Directives

In fact, this approach begs the question: does a least common denominator exist between devices such as a Javaenabled dishwasher and a cell phone or between a PDA and an Internet TV set-top box To a large extent, this is why the J2ME architecture has come to be; it defines a common approach that addresses how to support many devices without limiting their feature sets 221 Configurations and profiles J2ME introduces two architectural concepts: configurations and profiles Configurations make up the set of low-level APIs that define the runtime characteristics of a particular J2ME environment.

CHAPTER 12 s SEARCH ENGINE OPTIMIZATION AND JOOMLA!

EXIT [ exit-status | txn-directive ]

Specifically, configurations are responsible for defining the following: Core Java classes Java programming language features Virtual machine features Profiles address the more device-specific and use-specific APIs such as the widgets for the user interface, the data storage mechanisms and other more device-specific features such as the use of IR (infra-red) ports for beaming information between PDAs or accessing telephony features of a cell phone Configurations and profiles provide a separation of concern in the J2ME architecture between the need for portability and the need for supporting a wide range of devices and capabilities Configurations serve to increase portability across many different devices while profiles cater to the features of a specific device or a group of similar devices For example, configurations include core Java features such as String, System, Thread, and Object, as well as means for dealing with I/O streams and network connectivity.