java qr code reader app Understanding object/relational persistence in Java

Encoder QR-Code in Java Understanding object/relational persistence

Understanding object/relational persistence
Painting QR-Code In Java
Using Barcode creator for Java Control to generate, create QR Code 2d barcode image in Java applications.
www.OnBarcode.com
Decoding QR Code In Java
Using Barcode scanner for Java Control to read, scan read, scan image in Java applications.
www.OnBarcode.com
it s true that assembly code can always be at least as fast as Java code, or a handwritten parser can always be at least as fast as a parser generated by YACC or ANTLR in other words, it s beside the point. The unspoken implication of the claim is that hand-coded persistence will perform at least as well in an actual application. But this implication will be true only if the effort required to implement at-least-as-fast hand-coded persistence is similar to the amount of effort involved in utilizing an automated solution. The really interesting question is what happens when we consider time and budget constraints Given a persistence task, many optimizations are possible. Some (such as query hints) are much easier to achieve with hand-coded SQL/JDBC. Most optimizations, however, are much easier to achieve with automated ORM. In a project with time constraints, hand-coded persistence usually allows you to make some optimizations. Hibernate allows many more optimizations to be used all the time. Furthermore, automated persistence improves developer productivity so much that you can spend more time hand-optimizing the few remaining bottlenecks. Finally, the people who implemented your ORM software probably had much more time to investigate performance optimizations than you have. Did you know, for instance, that pooling PreparedStatement instances results in a significant performance increase for the DB2 JDBC driver but breaks the InterBase JDBC driver Did you realize that updating only the changed columns of a table can be significantly faster for some databases but potentially slower for others In your handcrafted solution, how easy is it to experiment with the impact of these various strategies Vendor independence An ORM abstracts your application away from the underlying SQL database and SQL dialect. If the tool supports a number of different databases (and most do), this confers a certain level of portability on your application. You shouldn t necessarily expect write-once/run-anywhere, because the capabilities of databases differ, and achieving full portability would require sacrificing some of the strength of the more powerful platforms. Nevertheless, it s usually much easier to develop a cross-platform application using ORM. Even if you don t require cross-platform operation, an ORM can still help mitigate some of the risks associated with vendor lock-in. In addition, database independence helps in development scenarios where developers use a lightweight local database but deploy for production on a different database.
Printing ECC200 In Java
Using Barcode creator for Java Control to generate, create ECC200 image in Java applications.
www.OnBarcode.com
Generating USS Code 39 In Java
Using Barcode creator for Java Control to generate, create Code 39 Full ASCII image in Java applications.
www.OnBarcode.com
Object/relational mapping
Encode Barcode In Java
Using Barcode maker for Java Control to generate, create Barcode image in Java applications.
www.OnBarcode.com
Encoding GS1 RSS In Java
Using Barcode creation for Java Control to generate, create GS1 DataBar Truncated image in Java applications.
www.OnBarcode.com
You need to select an ORM product at some point. To make an educated decision, you need a list of the software modules and standards that are available.
UCC.EAN - 128 Drawer In Java
Using Barcode creator for Java Control to generate, create EAN128 image in Java applications.
www.OnBarcode.com
Print ISSN - 13 In Java
Using Barcode creation for Java Control to generate, create ISSN - 10 image in Java applications.
www.OnBarcode.com
Introducing Hibernate, EJB3, and JPA
QR Code JIS X 0510 Scanner In C#
Using Barcode recognizer for .NET Control to read, scan read, scan image in Visual Studio .NET applications.
www.OnBarcode.com
QR Code Encoder In None
Using Barcode creator for Online Control to generate, create QR-Code image in Online applications.
www.OnBarcode.com
Hibernate is a full object/relational mapping tool that provides all the previously listed ORM benefits. The API you re working with in Hibernate is native and designed by the Hibernate developers. The same is true for the query interfaces and query languages, and for how object/relational mapping metadata is defined. Before you start your first project with Hibernate, you should consider the EJB 3.0 standard and its subspecification, Java Persistence. Let s go back in history and see how this new standard came into existence. Many Java developers considered EJB 2.1 entity beans as one of the technologies for the implementation of a persistence layer. The whole EJB programming and persistence model has been widely adopted in the industry, and it has been an important factor in the success of J2EE (or, Java EE as it s now called). However, over the last years, critics of EJB in the developer community became more vocal (especially with regard to entity beans and persistence), and companies realized that the EJB standard should be improved. Sun, as the steering party of J2EE, knew that an overhaul was in order and started a new Java specification request (JSR) with the goal of simplifying EJB in early 2003. This new JSR, Enterprise JavaBeans 3.0 (JSR 220), attracted significant interest. Developers from the Hibernate team joined the expert group early on and helped shape the new specification. Other vendors, including all major and many smaller companies in the Java industry, also contributed to the effort. An important decision made for the new standard was to specify and standardize things that work in practice, taking ideas and concepts from existing successful products and projects. Hibernate, therefore, being a successful data persistence solution, played an important role for the persistence part of the new standard. But what exactly is the relationship between Hibernate and EJB3, and what is Java Persistence Understanding the standards First, it s difficult (if not impossible) to compare a specification and a product. The questions that should be asked are, Does Hibernate implement the EJB 3.0 specification, and what is the impact on my project Do I have to use one or the other The new EJB 3.0 specification comes in several parts: The first part defines the new EJB programming model for session beans and message-driven beans, the deployment rules, and so on. The second part of the specification deals with persistence exclusively: entities, object/relational mapping metadata, persistence
Painting Denso QR Bar Code In Objective-C
Using Barcode creator for iPad Control to generate, create Denso QR Bar Code image in iPad applications.
www.OnBarcode.com
Reading QR Code ISO/IEC18004 In None
Using Barcode recognizer for Software Control to read, scan read, scan image in Software applications.
www.OnBarcode.com
Print Code 39 In Objective-C
Using Barcode generation for iPad Control to generate, create Code-39 image in iPad applications.
www.OnBarcode.com
Data Matrix Maker In Visual Studio .NET
Using Barcode printer for VS .NET Control to generate, create DataMatrix image in Visual Studio .NET applications.
www.OnBarcode.com
EAN 13 Generation In None
Using Barcode generator for Software Control to generate, create EAN13 image in Software applications.
www.OnBarcode.com
Paint USS Code 39 In None
Using Barcode generator for Software Control to generate, create Code 39 Extended image in Software applications.
www.OnBarcode.com
Generating Quick Response Code In Visual C#.NET
Using Barcode encoder for VS .NET Control to generate, create QR-Code image in VS .NET applications.
www.OnBarcode.com
QR-Code Generator In None
Using Barcode encoder for Microsoft Excel Control to generate, create Denso QR Bar Code image in Microsoft Excel applications.
www.OnBarcode.com
ECC200 Scanner In None
Using Barcode reader for Software Control to read, scan read, scan image in Software applications.
www.OnBarcode.com
Code 3 Of 9 Scanner In None
Using Barcode recognizer for Software Control to read, scan read, scan image in Software applications.
www.OnBarcode.com
Copyright © OnBarcode.com . All rights reserved.