Introduction Consistent exception hierarchy
18. DAO support
18.1 Introduction
The Data Access Object DAO support in Spring is aimed at making it easy to work with data access technologies like JDBC, Hibernate, JPA or JDO in a consistent way. This allows one to switch between the aforementioned persistence technologies fairly easily and it also allows one to code without worrying about catching exceptions that are specific to each technology.18.2 Consistent exception hierarchy
Spring provides a convenient translation from technology-specific exceptions like SQLException to its own exception class hierarchy with the DataAccessException as the root exception. These exceptions wrap the original exception so there is never any risk that one might lose any information as to what might have gone wrong. In addition to JDBC exceptions, Spring can also wrap Hibernate-specific exceptions, converting them to a set of focused runtime exceptions the same is true for JDO and JPA exceptions. This allows one to handle most persistence exceptions, which are non-recoverable, only in the appropriate layers, without having annoying boilerplate catch-and-throw blocks and exception declarations in one’s DAOs. One can still trap and handle exceptions anywhere one needs to though. As mentioned above, JDBC exceptions including database-specific dialects are also converted to the same hierarchy, meaning that one can perform some operations with JDBC within a consistent programming model. The above holds true for the various template classes in Springs support for various ORM frameworks. If one uses the interceptor-based classes then the application must care about handling HibernateExceptions and JDOExceptions itself, preferably via delegating to SessionFactoryUtils’ `convertHibernateAccessException.. or convertJdoAccessException methods respectively. These methods convert the exceptions to ones that are compatible with the exceptions in the org.springframework.dao exception hierarchy. As JDOExceptions are unchecked, they can simply get thrown too, sacrificing generic DAO abstraction in terms of exceptions though. The exception hierarchy that Spring provides can be seen below. Please note that the class hierarchy detailed in the image shows only a subset of the entire DataAccessException hierarchy. 4.3.9.RELEASE Spring Framework 40418.3 Annotations used for configuring DAO or Repository classes
Parts
» Dependency Injection and Inversion of Control Framework Modules
» Usage scenarios Introduction to the Spring Framework
» Java EE 6 and 7 Groovy Bean Definition DSL
» Core Container Improvements General Web Improvements
» WebSocket, SockJS, and STOMP Messaging Testing Improvements
» JMS Improvements Caching Improvements
» Web Improvements New Features and Enhancements in Spring Framework 1
» WebSocket Messaging Improvements Testing Improvements
» Core Container Improvements New Features and Enhancements in Spring Framework 4.2
» Data Access Improvements JMS Improvements Web Improvements
» Core Container Improvements Data Access Improvements Caching Improvements
» JMS Improvements Web Improvements WebSocket Messaging Improvements Testing Improvements
» Introduction to the Spring IoC container and beans
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» Introduction The Resource interface
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» Configuring a global date time format
» Spring Validation Validation, Data Binding, and Type Conversion
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» 3e0 4 .getValueDouble. 4e0 2 .getValueDouble.
» Classes used in the examples
» Introduction Aspect Oriented Programming with Spring
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» y.service.DefaultFooService y.SimpleProfiler aop:config
» Choosing which AOP declaration style to use
» Mixing aspect types Proxying mechanisms
» Introduction Pointcut API in Spring
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» Application server-specific integration Transaction Management
» Introduction Consistent exception hierarchy
» Annotations used for configuring DAO or Repository classes
» Introduction to Spring Framework JDBC
» Using the JDBC core classes to control basic JDBC processing and error handling
» Controlling database connections Data access with JDBC
» JDBC batch operations Data access with JDBC
» Simplifying JDBC operations with the SimpleJdbc classes
» Modeling JDBC operations as Java objects
» Common problems with parameter and data value handling
» Embedded database support Data access with JDBC
» Initializing a DataSource Data access with JDBC
» Introduction to ORM with Spring
» General ORM integration considerations
» Hibernate Object Relational Mapping ORM Data Access
» JDO Object Relational Mapping ORM Data Access
» Introduction Marshaller and Unmarshaller
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» XML Schema-based Configuration JAXB
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» Introduction to Spring Web MVC framework
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» Introduction Integrating with other web frameworks
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» Views and resolving them Multipart file upload support
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» absolute-ordering absolute-ordering WebSocket API
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» Introduction Controller method CORS configuration
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» Introduction Remoting and web services using Spring
» Using Hessian or Burlap to remotely call services via HTTP
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» Web services Remoting and web services using Spring
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» Introduction JMS Java Message Service
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» Introduction Exporting your beans to JMX
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» Accessing MBeans via Proxies
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» Introduction The Spring TaskExecutor abstraction
» The Spring TaskScheduler abstraction
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» Introduction A first example
» y.DefaultBookingService property Defining beans that are backed by dynamic languages
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» Introduction Understanding the cache abstraction
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» JCache JSR-107 annotations Cache Abstraction
» Declarative XML-based caching y.service.DefaultBookService
» Configuring the cache storage name =
» Classic ORM usage Classic Spring Usage
» JMS Usage Classic Spring Usage
» Concise proxy definitions Classic Spring AOP Usage
» Using the autoproxy facility
» Using TargetSources Classic Spring AOP Usage
» Introduction XML Schema-based configuration
» Introduction Authoring the schema
» Coding a NamespaceHandler Extensible XML authoring
» BeanDefinitionParser Extensible XML authoring
» Registering the handler and the schema
» Using a custom extension in your Spring XML configuration Meatier examples
» Introduction The argument tag The bind tag
» The escapeBody tag The eval tag The hasBindErrors tag
» The htmlEscape tag The message tag
» The nestedPath tag The param tag The theme tag
» The transform tag The url tag
» Introduction The button tag The checkbox tag
» The checkboxes tag The errors tag
» The option tag The options tag
» The password tag The radiobutton tag
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