SpringBoot整合H2Database（IDEA）

使用idea快速創建一個springboot工程項目

勾選以下幾個依賴

 

pom.xml文件內容如下：這裏採用MyBatis-Plus（增強版的Mybatis）框架作爲持久層

<?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>2.2.7.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.ssymon.test</groupId>
    <artifactId>h2demo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>h2demo</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>com.h2database</groupId>
            <artifactId>h2</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <!--持久層框架-->
        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-boot-starter</artifactId>
            <version>3.3.1.tmp</version>
        </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>

創建數據庫Schema和Data腳本文件：schema.sql，data.sql內容如下

--schema.sql
CREATE TABLE IF NOT EXISTS student
(
	id BIGINT(20) NOT NULL COMMENT '主鍵ID',
	name VARCHAR(30) NULL DEFAULT NULL COMMENT '姓名',
	age INT(11) NULL DEFAULT NULL COMMENT '年齡',
	gender INT(1) NULL DEFAULT 1 COMMENT '性別：1-男，0-女',
	PRIMARY KEY (id)
);
--data.sql
DELETE FROM student;
INSERT INTO student (id, name, age, gender) VALUES
(1, '張三', 11, 1),
(2, '李四', 12, 0),
(3, '王二', 13, 1),
(4, '麻子', 14, 0),
(5, '胡歌', 18, 1);

application.properties配置文件內容如下

# DataSource Config
spring.datasource.driver-class-name=org.h2.Driver
spring.datasource.url=jdbc:h2:D:/symon/project/db/mptest;
spring.datasource.username=symon
spring.datasource.password=123456
# 指定Schema (DDL)腳本
spring.datasource.schema=classpath:db/schema.sql
# 指定Data (DML)腳本
spring.datasource.data=classpath:db/data.sql
# 指定schema要使用的Platform
spring.datasource.platform=h2

# 是否啓用h2控制檯
spring.h2.console.enabled=true
# 配置h2控制檯訪問地址，http://localhost:8080/h2
spring.h2.console.path=/h2

啓動項目之後，訪問http://localhost:8080/h2即可訪問h2控制檯

輸入用戶名和密碼登錄即可，點擊STUDENT表，然後點擊Run即可查詢

新建實體類Student

@Data
public class Student {
    private Long id;
    private String name;
    private Integer age;
    private Integer gender;
}

新建Mapper類，這裏繼承的是MyBatis-Plus封裝的通用 CRUD接口

public interface StudentMapper extends BaseMapper<Student> {
}

在SpringBoot啓動類中添加@MapperScan註解，來掃描mapper文件夾

@SpringBootApplication
@MapperScan("com.ssymon.test.h2demo.dao")
public class H2demoApplication {
    public static void main(String[] args) {
        SpringApplication.run(H2demoApplication.class, args);
    }
}

在測試類中編寫代碼，進行測試

@SpringBootTest
class H2demoApplicationTests {

    @Autowired
    private StudentMapper studentMapper;

    @Test
    public void testSelect() {
        System.out.println("------ test start ------");
        List<Student> userList = studentMapper.selectList(null);
        for (Student student : userList) {
            System.out.println(student);
        }
        System.out.println("------ test end ------");
    }

    @Test
    void contextLoads() {

    }
}

執行測試代碼，控制檯輸出：

------ test start ------
Student(id=1, name=張三, age=11, gender=1)
Student(id=2, name=李四, age=12, gender=0)
Student(id=3, name=王二, age=13, gender=1)
Student(id=4, name=麻子, age=14, gender=0)
Student(id=5, name=胡歌, age=18, gender=1)
------ test end ------

結語：

        通過以上幾個簡單的步驟，SpringBoot整合H2數據庫就結束了！另外我們可以發現，我們連 XML 映射文件都不用編寫就實現了 Student表的 CRUD 功能，真香啊！

        從以上步驟中，我們可以看到集成MyBatis-Plus非常的簡單，只需要引入 starter 工程，並配置 mapper 掃描路徑即可。