Spring Boot + Mysql + JDBC template Exmaple || Java Inspires

0

#JavaInspires

Spring Boot + Mysql + JDBC template Exmaple


Project Folder Structure:


In MySQL, we have user table in the follwing structure.


pom.xml

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
<?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.javainspires</groupId>
 <artifactId>SimpleJdbcApp</artifactId>
 <version>0.0.1-SNAPSHOT</version>
 <packaging>jar</packaging>

 <name>SimpleJdbcApp</name>
 <description>Demo project for Spring Boot And Jdbc Template</description>

 <parent>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-starter-parent</artifactId>
  <version>2.0.2.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>
  <dependency>
   <groupId>org.springframework.boot</groupId>
   <artifactId>spring-boot-starter-jdbc</artifactId>
  </dependency>
  <dependency>
   <groupId>org.springframework.boot</groupId>
   <artifactId>spring-boot-starter-web</artifactId>
  </dependency>

  <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>

application.properties
 
1
2
3
4
5
6
7
8
9
#Database Configuration

#provide jdbc url for the database
spring.datasource.url=jdbc:mysql://localhost:3306/dev_db
#provide username and password
spring.datasource.username=root
spring.datasource.password=root
#provide driver class name , here we are using mysql database
spring.datasource.driver-class-name=com.mysql.jdbc.Driver


SimpleJdbcAppApplication.java

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
package com.javainspires.simpledbapp;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class SimpleJdbcAppApplication {

 public static void main(String[] args) {
  SpringApplication.run(SimpleJdbcAppApplication.class, args);
 }
}

UserController.java

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
package com.javainspires.simpledbapp.controller;

import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import com.javainspires.simpledbapp.repository.UserRepository;

@RestController
@RequestMapping(path = "/user")
public class UserController {

 // autowiring user repository
 @Autowired
 UserRepository userRepository;

 @GetMapping
 public String toTest() {
  return "Welcome to Java Inspires...";
 }

 /**
  * this method returns list of usernames
  * 
  * @return username list
  */
 @GetMapping(path = "/getusernames")
 public List<String> getAllUserNames() {
  return userRepository.getAllUserNames();
 }
}

UserRepository.java

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
package com.javainspires.simpledbapp.repository;

import java.util.ArrayList;
import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.stereotype.Repository;

@Repository
public class UserRepository {

 // we are autowiring jdbc template, 
 // using the properties we have configured spring automatically 
 // detects and creates jdbc template using the configuration
 @Autowired
 JdbcTemplate jdbcTemplate;
 
 
 public List<String> getAllUserNames() {
  List<String> userNameList = new ArrayList<>();
  userNameList.addAll(jdbcTemplate.queryForList("select name from user;", String.class));
  return userNameList;
 }

 
}

Thank You...

Tags:

Post a Comment

Previous Post Next Post