Spring ORM

• ORM tools are used To interact with database.
• Some examples of ORM tools are
• Top link
• Hibernate
• iBATIS
• Advantages
• Less coding is required
• Easy to test
• Better exception handling
• Integrated transaction management.
• We will use hibernate as an example here.
• HibernateTemplate class is used to interact hibernate with spring.
• Spring uses this class to perform operations on database.
• We need to create entity classes which act as wrapper classes of our database tables.
• For example, a class called product DAO will act as a wrapper for product table.
• A class student DAO will act as a wrapper for student table.
• These entity classes depend on hibernateTemplate class object i.e. we need to inject hibernateTemplate Object in our entity class.
• Hibernate template then depends on SessionFactory interface which needs to be injected in HibernateTemplate.
• SessionFactory Is an interface whose implementation class LocalSessionFactoryBean is injected in HibernateTemplate.
• LocalSessionFactoryBean requires following properties.
• DataSource which provides Database Properties
• URL
• username
• Password
• Hibernate properties
• Dialect
• Show SQL
• Format, SQL
• Annotated classes i.e. our entity classes.