In this Spring Data JPA One To Many article, we will learn how to achieve One To Many Mapping using Spring Data JPA. In this approach, we will re-use the same two tables which we used in our previous Spring Data JPA One To One Example. [Read more…]
Spring Data JPA One To One Foreign Key Example
In this Spring Data JPA One To One article, we will learn how to achieve One To One Mapping using Spring Data JPA. In this approach, we will have two tables with different primary keys. The primary key of EMPLOYEE table (EMP_ID) will act as a foreign key for the EMPLOYEE_ADDRESS table and EMPLOYEE_ADDRESS table will have its own primary key (ADDR_ID). [Read more…]
Hibernate CRUD Example in Eclipse (XML Mapping) with Maven + Oracle
In this Hibernate CRUD Example, we will learn how to use Hibernate to perform CRUD operations using XML Mapping. We will be using Oracle database and build an Employee Management System which has the capabilities of Creating a new employee, Getting all the employees, Update the existing employee, Delete an employee. [Read more…]
Spring MVC CRUD Example with MySql + JdbcTemplate
In this Spring MVC CRUD Example, we will be building a simple web-based Spring MVC Application (Employee management) which has the ability to perform CRUD Operations using Spring JdbcTemplate. Our Employee management application will have abilities to create a new employee, update the existing employee, get a particular employee/ all employee and finally delete the existing employee. [Read more…]
Spring CRUD Example with JdbcTemplate + Maven + Oracle
In this Spring CRUD Example, we will build a Simple Spring Application and perform CRUD operations using Spring JdbcTemplate. We will create a simple Employee management application which has abilities to create a new employee, update the existing employee, get a particular employee/ all employee and finally delete the existing employee. [Read more…]
Difference between session.get() and session.load() in Hibernate
What is the Difference between session.get() and session.load() in Hibernate ? This is one of the most asked interview question in Hibernate. Both the get() and load() methods are defined in the Session interface and used to retrieve the information of a specific record. In this article, we will see what is the difference between then and when to use which method. [Read more…]
Spring JdbcTemplate Example + JdbcDaoSupport
Spring framework provides excellent support to JDBC, it provides a super powerful utility class called “JdbcTemplate” which helps us avoid boiler-plate code from our database operations such as Creating Connection, Statement, Closing the Resultset and Connection, Exception handling, Transaction management etc. In this Spring JdbcTemplate Example, let’s understand how JdbcTemplate eases the development effort. [Read more…]
Spring Boot – How to Change Embedded Tomcat default port
By default, the embedded tomcat server of Spring Boot application will be starting at port 8080. In this article, we will learn how to change embedded Tomcat default port using one of the following approaches
- Using application.properties or application.yml
- Implementing EmbeddedServletContainerCustomizer interface
- Using SpringApplication class
- Change port directly through command line
[Read more…]
Hibernate Component Mapping using XML
Previously we have learned about Component Mapping in Hibernate using Annotations. In this example, we will learn about Hibernate Component Mapping using XML. In our example, we have two classes Employee and EmployeeAddress. The Employee can have an Address but Address cannot exist separately without Employee. Since the Employee and Address entities are strongly related, it is better to store them in a single table using component mapping(<component> tag). [Read more…]
Component Mapping in Hibernate Using Annotations | @Embeddable & @Embedded
In this example, we will learn about Component Mapping in Hibernate Using Annotations. Component Mapping represents the has-a relationship, the composition is stronger association where the contained object has no existence of its own. For example, Employee has an Address, an address cannot exist separately without Employee. Since the Employee and Address entities are strongly related, it is better to store them in a single table. [Read more…]
