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https://zhidao.baidu.com/daily/view?id=205590

package com.example.datasourcedemo;

import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.jdbc.core.JdbcTemplate;

import javax.sql.DataSource;
import java.sql.Connection;
import java.sql.SQLException;

/**
 * 单数据源
 */
@SpringBootApplication
@Slf4j
public class DatasourceDemoApplication implements CommandLineRunner {
    @Autowired
    private DataSource dataSource;
    @Autowired
    private JdbcTemplate jdbcTemplate;

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

    @Override
    public void run(String... args) throws Exception {
        showConnection();
        showData();
        System.exit(1);
    }

    private void showConnection()throws SQLException {
        log.info(dataSource.toString());
        Connection conn = dataSource.getConnection();
        log.info(conn.toString());
        conn.close();
    }

    private void showData(){
        jdbcTemplate.queryForList("SELECT * FROM FOO")
                .forEach(row -> log.info(row.toString()));
    }
}

management:
    endpoints:
        web:
            exposure:
                include: '*'
spring:
    datasource:
        hikari:
            connectionTimeout: 30000
            idleTimeout: 600000
            maxLifetime: 1800000
            maximumPoolSize: 5
            minimumIdle: 5
        password: ''
        url: jdbc:h2:mem:testdb
        username: sa
    output:
        ansi:
            enabled: ALWAYS

INSERT INTO FOO (ID, BAR) VALUES (1, 'aaa');
INSERT INTO FOO (ID, BAR) VALUES (2, 'bbb');

CREATE TABLE FOO (ID INT IDENTITY, BAR VARCHAR(64));

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.2.5.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.example</groupId>
    <artifactId>datasource-demo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>datasource-demo</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
        <dependency>
            <groupId>com.h2database</groupId>
            <artifactId>h2</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
        </dependency>
        <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>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
            <exclusions>
                <exclusion>
                    <groupId>org.junit.vintage</groupId>
                    <artifactId>junit-vintage-engine</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
    </dependencies>

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

</project>