Code example sharing for accessing multiple different databases at the same time in Java Spring

CREATE TABLE usermaster ( 
   id integer, 
   name character varying, 
   emailid character varying, 
   phoneno character varying(10), 
   location character varying
) 

INSERT INTO usermaster(id, name, emailid, phoneno, location)
VALUES (1, 'name_postgres', 'email@email.com', '1234567890', 'IN');

CREATE TABLE `usermaster` (
   `id` int(11) NOT NULL, 
   `name` varchar(255) DEFAULT NULL, 
   `emailid` varchar(20) DEFAULT NULL, 
   `phoneno` varchar(20) DEFAULT NULL, 
   `location` varchar(20) DEFAULT NULL, 
   PRIMARY KEY (`id`) 
)

INSERT INTO `kode12`.`usermaster` 
  (`id`, `name`, `emailid`, `phoneno`, `location`)
VALUES
  ('1', 'name_mysql', 'test@tset.com', '9876543210', 'IN');

<?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.aegis</groupId>
    <artifactId>MultipleDBConnect</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>MultipleDB</name>
    <description>MultipleDB with Spring Boot</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.3.5.RELEASE</version>
        <relativePath />
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jdbc</artifactId>
        </dependency>

        <dependency>
            <groupId>org.postgresql</groupId>
            <artifactId>postgresql</artifactId>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.38</version>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>
</project>

server.port=6060
spring.ds_post.url =jdbc:postgresql://localhost:5432/kode12
spring.ds_post.username =postgres
spring.ds_post.password =root
spring.ds_post.driverClassName=org.postgresql.Driver
spring.ds_mysql.url = jdbc:mysql://localhost:3306/kode12
spring.ds_mysql.username = root
spring.ds_mysql.password = root
spring.ds_mysql.driverClassName=com.mysql.jdbc.Driver

package com.aegis;

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

@SpringBootApplication
public MultipleDbApplication {

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

@Configuration
@EnableAutoConfiguration
@ComponentScan
@Target(value={TYPE})
@Retention(value=RUNTIME)
@Documented
@Inherited

@Configuration
@EnableAutoConfiguration
@ComponentScan

package com.aegis.config;
import javax.sql.DataSource;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.boot.autoconfigure.jdbc.DataSourceBuilder;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
import org.springframework.jdbc.core.JdbcTemplate;

@Configuration
public class MultipleDBConfig {
    @Bean(name = "mysqlDb")
    @ConfigurationProperties(prefix = "spring.ds_mysql")
    public DataSource mysqlDataSource() {
        return DataSourceBuilder.create().build();
    }

    @Bean(name = "mysqlJdbcTemplate")
    public JdbcTemplate jdbcTemplate(@Qualifier("mysqlDb") DataSource dsMySQL) {
        return new JdbcTemplate(dsMySQL);
    }

    @Bean(name = "postgresDb")
    @ConfigurationProperties(prefix = "spring.ds_post")
    public DataSource postgresDataSource() {
        return  DataSourceBuilder.create().build();
    }

    @Bean(name = "postgresJdbcTemplate")
    public JdbcTemplate postgresJdbcTemplate(@Qualifier("postgresDb") 
                                              
    DataSource dsPostgres) {
        return new JdbcTemplate(dsPostgres);
    }
}

@Bean(name = "mysqlDb")
@ConfigurationProperties(prefix = "spring.ds_mysql")
public DataSource mysqlDataSource() {
return DataSourceBuilder.create().build();
}

@Bean(name = "mysqlJdbcTemplate")
public JdbcTemplate jdbcTemplate(@Qualifier("mysqlDb") DataSource dsMySQL) {
     return new JdbcTemplate(dsMySQL);
}

@Bean(name = "postgresDb")
@ConfigurationProperties(prefix = "spring.ds_post")
public DataSource postgresDataSource() {
   return  DataSourceBuilder.create().build();
}

@Bean(name = "postgresJdbcTemplate")
public JdbcTemplate postgresJdbcTemplate(@Qualifier("postgresDb")
DataSource dsPostgres) {
  return new JdbcTemplate(dsPostgres);
}

package com.aegis.controller;
import java.util.HashMap;
import java.util.Map;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class DemoController {

    @Autowired
    @Qualifier("postgresJdbcTemplate")
    private JdbcTemplate postgresTemplate;

    @Autowired
    @Qualifier("mysqlJdbcTemplate")
    private JdbcTemplate mysqlTemplate;

    @RequestMapping(value = "/getPGUser")
    public String getPGUser() {
        Map<String, Object> map = new HashMap<String, Object>();
        String query = " select * from usermaster";
        try {
            map = postgresTemplate.queryForMap(query);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return "PostgreSQL Data: " + map.toString();
    }

    @RequestMapping(value = "/getMYUser")
    public String getMYUser() {
        Map<String, Object> map = new HashMap<String, Object>();
        String query = " select * from usermaster";
        try {
            map = mysqlTemplate.queryForMap(query);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return "MySQL Data: " + map.toString();
    }
}

@Autowired
@Qualifier("postgresJdbcTemplate")
private JdbcTemplate postgresTemplate;