spring_jdbc_template's Introduction

Spring_JDBC_Template

This is a Spring JDBC Template using the com.mysql.cj.jdbc.Driver data source driver.

Project structure

|--src/main/
|   |--java
|   |   |--com/jdbc/template
|   |   |   **SpringJdbcTemplateApplication.java
|   |   |   |--config
|   |   |   |   **JdbcConfig.java
|   |   |   |--dao
|   |   |   |   |--impl
|   |   |   |   |   **EmployeeDAOImpl.java
|   |   |   |   |--models
|   |   |   |   |   **EmployeeDAO.java
|   |   |   |--errorHandlers
|   |   |   |   **CustomSQLErrorCodeTranslator.java
|   |   |   |--mapper
|   |   |   |   **EmployeeRowMapper.java
|   |   |   |--models
|   |   |   |   **Employee.java
|   |   |   |--services
|   |   |   |   **EmpoyeeTest.java
|   |--resources
|   |   **application.properties

Run Template as is

Create a table inside your database called "Employee"

CREATE TABLE `Employee` (
  `id` int(11) unsigned NOT NULL,
  `name` varchar(20) DEFAULT NULL,
  `role` varchar(20) DEFAULT NULL,
  PRIMARY KEY (`id`)
)

Insert your mysql database information (username, password, and url) into the application.properties file

spring.datasource.username=[username]
spring.datasource.password=[password]
spring.datasource.url=jdbc:mysql://[url]:[port]/[database name]
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver

Run it!

Notes

a. The EmployeeTest class [com.jdbc.template.services] simply just saves a single "employee" to the table and outputs if it was successful or not.

@Service
public class EmployeeTest {

	@Autowired
	EmployeeDAO employeeDAO;

	@PostConstruct
	public void test() {

		Employee emp1 = new Employee(0, "[NAME HERE]", "[ROLE HERE]");

		int output = employeeDAO.save(emp1);

		if (output != 0) {
			System.out.println("Employee " + emp1.getName() + " was saved successfully with id: " + emp1.getId());
		} else {
			System.out.println("Employee " + emp1.getName() + "with id: " + emp1.getId() + " could not be saved.");
		}
	}
}

The @PostConstruct annotation just executes the "test" method after all dependencies have been injectioned. This isn't required, this is just a quick way to call the method for demo purposes.

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