Springboot+H2数据库配置demo

POM文件-引入spirngboot和H2的依赖包

pom文件

<?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>1.4.3.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.try.test</groupId>
    <artifactId>springh2demo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>springh2demo</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-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>
        <dependency>
            <groupId>com.h2database</groupId>
            <artifactId>h2</artifactId>
            <scope>runtime</scope>
        </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>

数据库模型对象类

import javax.persistence.*;
 
@Entity
public class User {
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Long id;
 
    @Column
    private String username;
 
    @Column
    private String name;
 
    @Column
    private Short age;
 
 
    public Long getId() {
        return id;
    }
 
    public void setId(Long id) {
        this.id = id;
    }
 
    public String getUsername() {
        return username;
    }
 
    public void setUsername(String username) {
        this.username = username;
    }
 
    public String getName() {
        return name;
    }
 
    public void setName(String name) {
        this.name = name;
    }
 
    public Short getAge() {
        return age;
    }
 
    public void setAge(Short age) {
        this.age = age;
    }
}

JPA dao类

import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.stereotype.Repository;
 
 
@Repository
public interface UserRepository extends JpaRepository<User, Long> {
}
Springboot controller
 
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;
 
@RestController
public class UserController {
 
    @Autowired
    private UserRepository userRepository;
 
    @GetMapping("/user/{id}")
    // 注意，此处使用的是GetMapping注解，该注解的作用类似与@RequestMapping(value="/user/{id}" ,method=RequestMethod.GET)，@PostMapping注解同理
    public User findById(@PathVariable Long id) {
        return this.userRepository.findOne(id);
    }
}

应用配置和数据库配置 application.properties

# 服务器端口号
server.port=7900
# 是否生成ddl语句
spring.jpa.generate-ddl=false
# 是否打印sql语句
spring.jpa.show-sql=true
# 自动生成ddl，由于指定了具体的ddl，此处设置为none
spring.jpa.hibernate.ddl-auto=none
# 使用H2数据库
spring.datasource.platform=h2
# 指定生成数据库的schema文件位置
spring.datasource.schema=classpath:schema.sql
# 指定插入数据库语句的脚本位置
spring.datasource.data=classpath:data.sql
# 配置日志打印信息
logging.level.root=INFO
logging.level.org.hibernate=INFO
logging.level.org.hibernate.type.descriptor.sql.BasicBinder=TRACE
logging.level.org.hibernate.type.descriptor.sql.BasicExtractor=TRACE
logging.level.com.itmuch=DEBUG
data.sql

初始化的数据内容

INSERT INTO user(`id`,`username`,`name`,`age`) values (1,'root','root','123');
schema.sql 

初始化新建表结构

CREATE TABLE IF NOT EXISTS `user` (
  `id` int(11) NOT NULL AUTO_INCREMENT COMMENT '自增id',
`username` varchar(64) NOT NULL DEFAULT '0' COMMENT '用户名',
`name` varchar(64) NOT NULL DEFAULT '' COMMENT '姓名',
`age` varchar(64) NOT NULL DEFAULT '' COMMENT '年龄'
)ENGINE=InnoDB AUTO_INCREMENT=0 DEFAULT CHARSET=utf8;

启动应用

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
@RestController
@SpringBootApplication
public class Springh2demoApplication {
    @RequestMapping("/")
    public static String index(){
        return "hello springboot";
    }
 
    public static void main(String[] args) {
        SpringApplication.run(Springh2demoApplication.class, args);
    }
}