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held by the object at the point when save() was called. You can modify the object after calling save(), and your changes will be propagated to the database as an (additional) SQL UPDATE. Everything between session.beginTransaction() and tx.commit() occurs in one transaction. For now, keep in mind that all database operations in transaction scope either completely succeed or completely fail. If one of the UPDATE or INSERT statements made during flushing on tx.commit() fails, all changes made to persistent objects in this transaction are rolled back at the database level. However, Hibernate doesn t roll back in-memory changes to persistent objects. This is reasonable because a failure of a transaction is normally nonrecoverable, and you have to discard the failed Session immediately. We ll discuss exception handling later in the next chapter. Retrieving a persistent object The Session is also used to query the database and retrieve existing persistent objects. Hibernate is especially powerful in this area, as you ll see later in the book. Two special methods are provided for the simplest kind of query: retrieval by identifier. The get() and load() methods are demonstrated in listing 9.3. java upc-a reader UPC-A Java Control- UPC-A barcode generator with free Java sample
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This guide provides Java APIs for UPC-A barcode reading and Java sample code for UPC-A barcode recognition. Please download free Java Barcode Reader ... Avoid predefined types If there is any possibility that a type might change, avoid using predefined types anywhere but in typedef or type definitions. It s easy to create new types that are functionally oriented, and it s hard to change data in a program that uses hardwired types. Moreover, use of functionally oriented type declarations partially documents the variables declared with them. A declaration like Coordinate x tells you a lot more about x than a declaration like float x. Use your own types as much as you can. Don t redefine a predefined type Changing the definition of a standard type can create confusion. For example, if your language has a predefined type Integer, don t create your own type called Integer. Readers of your code might forget that you ve redefined the type and assume that the Integer they see is the Integer they re used to seeing. Define substitute types for portability In contrast to the advice that you not change the definition of a standard type, you might want to define substitutes for the standard types so that on different hardware platforms you can make the variables represent exactly the same entities. For example, you can define a type INT and use it instead of int, or a type LONG instead of long. Originally, the only difference between the two types would be their capitalization. But when you moved the program to a new word 2010 ean 13, convert word doc to qr code, birt code 39, ms word code 39, birt code 128, birt ean 128 java upc-a reader Java UPC-A Barcodes Generator for Java , J2EE, JasperReports
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How to create a barcode reader in Java to scan and read UPC-A barcodes in Java SE, Java EE and Java ME platforms. @Secured({"ROLE_ADMINISTRATOR"}) void deleteUser(UserAccount account); @Secured({"ROLE_ADMINISTRATOR"}) void updateUser(UserAccount account); @Secured({"ROLE_ADMINISTRATOR","ROLE_USER"}) List<UserAccount> listUsers(); } Listing 7-23 shows the advice configuration needed to support the use of the @Secured annotation used in Listing 7-22. PrintStream out = new PrintStream(new FileOutputStream(RESULT)); DatabaseConnection connection = new HsqldbConnection("filmfestival"); Creates connection Statement stm = connection.createStatement(); to HSQL database ResultSet rs = stm.executeQuery( "SELECT country FROM film_country ORDER BY country"); while (rs.next()) { out.println(rs.getString("country")); } stm.close(); connection.close(); If you need to remove all rows from a table, use TRUNCATE TABLE and not DELETE without a WHERE clause. DELETE is always fully logged, and with large tables it can take a while to complete. TRUNCATE TABLE is always minimally logged, regardless of the recovery model of the database, and therefore, it is always significantly faster than a DELETE. Note though, that TRUNCATE TABLE will not fire any DELETE triggers on the table. To give you a sense of the difference, using TRUNCATE TABLE to clear a table with millions of rows can take a matter of seconds, while clearing the table with DELETE can take a few hours. java upc-a reader zxing/zxing: ZXing ("Zebra Crossing") barcode scanning ... - GitHub
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