Object-relational mapping (ORM) is a programming technique in which a metadata descriptor is used to connect object code to a relational database. Object code is written in object-oriented programming (OOP) languages such as Java or C#. ORM converts data between type systems that are unable ...
Transparent Persistence:OpenJPA offers transparent persistence, meaning developers can work with POJOs without writing complex SQL queries or dealing with low-level database operations. It handles the mapping between objects and the underlying database, simplifying the development process. Caching and Perfo...
As you can see in the above code snippet, theUpdate()method returns the number of rows that have been affected, meaning the number of records that have been updated. In this example, just one record has been updated and hence the method would return 1 on success. Stored procedures using ...
EAV Models are, without a doubt, the most complicated part of the Magento system that an ecommerce web developer will need to deal with. Remember to take deep breaths and that, at the end of the day, its just programming. Everything happens for a concrete reason, you just need to figur...
In conjunction with SQLite having foreign keys disabled by default (meaning ON DELETE is ignored, even if you specify it explicitly), this can lead to surprising and dangerous behaviour. To avoid this, you may want to use one or both of AutoIncrementField and pragmas=[('foreign_keys', '...
When using framework programming, you will find more concern about the flow of data and how to build a configuration system for abstract parameters. In most of the programming time, in addition to the specific field meaning requires specific attention, most of them are based on automated programm...
Each instruction has asemanticmeaning that expresses what you are trying to accomplish. Although you must follow the rules of C# syntax, the semantics of the language are far more important in developing effective object-oriented programs. This book will provide insight into both the syntax and th...
Furthermore, you can omit both the variable and the type (meaning that all exceptions will be caught): Copy catch { ... } Tip In languages other than C#, it is possible (though not recommended) to throw an object that does not derive from Exception. The CLR automatically wraps that...
Though there is no enforced meaning to the four parts of the version number, the fact that they are ordered from most significant to least significant is used in the assembly binding process if you specify a range of versions to redirect. Looking back at the manifest shown in Figure 20.2, ...
Attributes appear as metadata in the final compiled assembly, and they are used by classes and applications that, by design, extract meaning from specific attributes. In this chapter's code, we'll make use of the PropertyGrid control, the control that implements the Properties panel within the...