Create Spring Boot Project
On the Eclipse, create a Spring Boot project
Enter Project Information:
- Name: LearnSpringBootWithRealApps
- Group: com.demo
- Artifact: LearnSpringBootWithRealApps
- Description: Learn Spring Boot with Real Apps
- Package: com.demo
Select the technologies and libraries to be used:
- JDBC
- MySQL
Click Next button to show Site Information for project
Click Finish button to finish create Spring Boot project
Configure pom.xml
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0
http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.demo</groupId>
<artifactId>LearnSpringBootWithRealApps</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>LearnSpringBootWithRealApps</name>
<description>Learn Spring Boot with Real Apps</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.10.RELEASE</version>
<relativePath /> <!-- lookup parent from repository -->
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
</properties>
<dependencies>
<!-- Spring Framework -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter</artifactId>
</dependency>
<!-- Spring JDBC -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jdbc</artifactId>
</dependency>
<!-- MySQL JDBC -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
Create Database
Create a database with the name is learn_spring_boot_with_real_apps. This database have 1 table: Product table
--
-- Table structure for table `product`
--
CREATE TABLE `product` (
`id` int(11) NOT NULL PRIMARY KEY AUTO_INCREMENT,
`name` varchar(250) COLLATE utf8_unicode_ci NOT NULL,
`price` decimal(10,1) NOT NULL,
`quantity` int(11) NOT NULL,
`description` text COLLATE utf8_unicode_ci NOT NULL,
`photo` varchar(250) COLLATE utf8_unicode_ci NOT NULL,
`featured` tinyint(1) NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;
--
-- Dumping data for table `product`
--
INSERT INTO `product` (`name`, `price`, `quantity`, `description`, `photo`, `featured`) VALUES('Mobile 1', '2.0', 2, 'description 1', 'thumb1.gif', 1);
INSERT INTO `product` (`name`, `price`, `quantity`, `description`, `photo`, `featured`) VALUES('Mobile 2', '1.0', 5, 'description 2', 'thumb2.gif', 1);
INSERT INTO `product` (`name`, `price`, `quantity`, `description`, `photo`, `featured`) VALUES('Mobile 3', '3.0', 9, 'description 3', 'thumb3.gif', 1);
INSERT INTO `product` (`name`, `price`, `quantity`, `description`, `photo`, `featured`) VALUES('Computer 1', '5.0', 12, 'description 4', 'thumb1.gif', 0);
INSERT INTO `product` (`name`, `price`, `quantity`, `description`, `photo`, `featured`) VALUES('Computer 2', '7.0', 5, 'description 5', 'thumb1.gif', 1);
INSERT INTO `product` (`name`, `price`, `quantity`, `description`, `photo`, `featured`) VALUES('Computer 3', '12.0', 2, 'description 6', 'thumb2.gif', 1);
INSERT INTO `product` (`name`, `price`, `quantity`, `description`, `photo`, `featured`) VALUES('Laptop 1', '3.0', 8, 'description 7', 'thumb2.gif', 0);
INSERT INTO `product` (`name`, `price`, `quantity`, `description`, `photo`, `featured`) VALUES('Laptop 2', '4.0', 11, 'description 8', 'thumb3.gif', 0);
INSERT INTO `product` (`name`, `price`, `quantity`, `description`, `photo`, `featured`) VALUES('Laptop 3', '2.0', 15, 'description 9', 'thumb2.gif', 1);
Structure of Product Table
Data of Product Table
Configure application.properties
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.url= jdbc:mysql://localhost:3306/learn_spring_boot_with_real_apps
spring.datasource.username=root
spring.datasource.password=123456
Entities Class
Create new package named com.demo.entities. In this package, create a entity class – Product.java, to represent the above table
Product.java
package com.demo.entities;
import java.io.Serializable;
import java.math.BigDecimal;
public class Product implements Serializable {
private int id;
private String name;
private BigDecimal price;
private int quantity;
private String description;
private String photo;
private boolean featured;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public BigDecimal getPrice() {
return price;
}
public void setPrice(BigDecimal price) {
this.price = price;
}
public int getQuantity() {
return quantity;
}
public void setQuantity(int quantity) {
this.quantity = quantity;
}
public String getDescription() {
return description;
}
public void setDescription(String description) {
this.description = description;
}
public String getPhoto() {
return photo;
}
public void setPhoto(String photo) {
this.photo = photo;
}
public boolean isFeatured() {
return featured;
}
public void setFeatured(boolean featured) {
this.featured = featured;
}
}
DAO Layer
Create new package named com.demo.dao. Create classes and interface for DAO layer. DAO layer use JDBC technologies manipulate the database
ProductDAO Interface
package com.demo.dao;
import com.demo.entities.Product;
public interface ProductDAO {
public boolean update(Product product);
}
ProductDAOImpl Class
package com.demo.dao;
import com.demo.entities.Product;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.stereotype.Repository;
@Repository("productDAO")
public class ProductDAOImpl implements ProductDAO {
@Autowired
private JdbcTemplate jdbcTemplate;
@Override
public boolean update(Product product) {
return this.jdbcTemplate.update("update product set name = ?, price = ?, quantity = ?, description = ?, photo = ?, featured = ? where id = ?", product.getName(), product.getPrice(), product.getQuantity(), product.getDescription(), product.getPhoto(), product.isFeatured(), product.getId()) > 0;
}
}
Structure of Spring Boot Project
Run Application
Open LearnSpringBootWithRealAppsApplication.java file in com.demo package, call methods from ProductDAO. To show result to console, this class need implements from CommandLineRunner
package com.demo;
import java.math.BigDecimal;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import com.demo.dao.ProductDAO;
import com.demo.entities.Product;
@SpringBootApplication
public class LearnSpringBootWithRealAppsApplication implements CommandLineRunner {
@Autowired
ProductDAO productDAO;
public static void main(String[] args) {
SpringApplication.run(LearnSpringBootWithRealAppsApplication.class, args);
}
@Override
public void run(String... arg0) throws Exception {
System.out.println("Update product with Id is 18");
Product product = new Product();
product.setId(18);
product.setName("New Name 1");
product.setPrice(BigDecimal.valueOf(222));
product.setQuantity(33);
product.setDescription("New Description");
product.setPhoto("b.gif");
product.setFeatured(true);
boolean result = productDAO.update(product);
System.out.println("Result: " + result);
}
}
Output
Result: true
References
I recommend you refer to the books below to learn more about the knowledge in this article:
- Spring Boot in Action
- Pro Spring Boot
- Spring Data
- JDBC API Tutorial and Reference (3rd Edition)
- Database Programming with JDBC & Java: Developing Multi-Tier Applications (Java (O’Reilly))