Java Enterprise in a Nutshell by William Crawford, Jim Farley

By William Crawford, Jim Farley

Nothing is as consistent as switch, and this can be as real in company computing as wherever else. With the hot free up of Java 2 firm version 1.4, builders are being referred to as directly to upload even larger, extra complicated degrees of interconnectivity to their purposes.

to do that, Java builders this day desire a transparent knowing of the way to use the hot APIs, use the most recent open resource Java instruments, and examine the features and pitfalls in Java 2 company version 1.4 -- to allow them to plan a expertise and implementation procedure for brand new company tasks.

thankfully, this can be precisely what they get with the recent Java company in a Nutshell, third version. simply because so much built-in improvement environments (IDE) this day comprise API look up, we took out the most API sections from our prior variation to make room for brand spanking new chapters, between others, on Ant, Cactus, Hibernate, Jakarta Struts, JUnit, safety, XDoclet, and XML/JAXP.

Revised and up to date for the recent 1.4 model of sunlight Microsystems Java firm variation software program, Java company in a Nutshell, third variation is a pragmatic consultant for firm Java developers.

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GetFloat(2)); In this example, we first create a CallableStatement using the prepareCall() method and passing in the appropriate escape syntax for the stored procedure. Since this stored procedure has an output parameter (actually, in this case, an INOUT parameter, which means it also serves as an input parameter), we use the registerOutParameter() method to identify that parameter as an output of type FLOAT. Note that just as with prepared statements, substituted parameters are numbered from 1 to n, left to right.

If you roll back your transaction, other transactions may be left with invalid data. TRANSACTION_READ_COMMITTED Transactions are prevented from reading rows with uncommitted changes, or in other words, dirty reads are not allowed. TRANSACTION_REPEATABLE_READ Protects against repeatable reads as well as dirty reads. Say one transaction reads a row that is subsequently altered (and committed) by another transaction. If the first transaction reads the row again, the first transaction does not get a different value the second time around.

For a more complete treatment of JDBC and general database concepts, I recommend Database Programming with JDBC and Java by George Reese (O'Reilly). 1. JDBC Architecture Different database systems have surprisingly little in common: just a similar purpose and a mostly compatible query language. Beyond that, every database has its own API that you must learn to write programs that interact with the database. This has meant that writing code capable of interfacing with databases from more than one vendor has been a daunting challenge.

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