Spring Data Access

-
42. What is JdbcTemplate? 
Spring simplifies handling database access with the Spring JDBC Template exposed through the
JdbcTemplateclass. Spring JDBC Template simplifies the use of JDBC and helps to avoid common
errors. Spring JDBC Template is responsible for executing the core JDBC workflow.
Application code only needs to provide SQL and retrieve results. Spring JDBC Template executes
SQL queries or updates and initiates iteration overResultSet objects. It also catches JDBC
exceptions and translates them to the generic, more informative exception hierarchy. 
43. Why use an embedded database? Name few embedded databases
that Spring supports natively. 

Spring 3 introduced the support for embedded Java database engines. The embedded
databases are very useful during the development phase of the project. They provide almost the
same features as their standalone version, and at the same time are lightweight, have a quick start
time, and extremely fast. Being fast they are a big boon to developers who have to continuously
run their integration tests directly or as part of Continuous Integration (CI). 
An embedded database also improve testability and provides ease of configuration.
All these features allow developers to focus more on the development instead of how to
configure a data source. It eliminates the burden of bigger, bulkier databases like Oracle. 
Some embedded databases that Spring natively supports are HSQL, H2, and Derby. 

Comments

Post a Comment

Popular posts from this blog

Spring Annotations

-
26. Are annotations better than XML for configuring Spring?  Spring supports both XML and Annotation based configuration, and both complement each other. It all depends on the requirements and the developer’s personal opinion on which of the configurations better suits him.  Annotations provide a lot of context in their declaration, leading to shorter and more concise configuration. All the information is in a single source file. When the class changes, you don’t have to worry about the XML file.  However, XML excels at wiring up components without touching their source code or recompiling them. XML clearly separates the Plain Old Java Object (POJO) and its behavior.  No matter the choice, Spring can accommodate both styles and even mix them together.  27. What is annotation-based container configuration?  Starting with Spring 2.5, annotation support has been added to the Spring Framework. It is now possible to configure Beans using annotations.  XML configurations are
Read more

Spring Model View Controller (MVC)

-
33. What is Spring MVC framework?  Spring Model View Controller (MVC) is the Web module of the Spring Framework. It provides a rich functionality for building robust Web Applications. The Spring MVC Framework is architected and designed in such a way that every piece of logic and functionality is highly configurable.  The MVC framework of Spring is request-driven and is designed around a central servlet, called DispatcherServlet that dispatches requests to controllers.  Spring’s DispatcherServlet is completely integrated with Spring IoC container and allows you to use every other feature of Spring.  34. What is DispatcherServlet?  In Spring MVC, the client sends a request to the Web container in the form of HTTP request. This incoming request is intercepted by the Front controller which is the DispatcherServlet and it then tries to find out appropriate handler mappings. The DispatcherServlet dispatches the request to the appropriate controller with the help of handler mappin
Read more