java内嵌数据库hsqldb

java内嵌数据库hsqldb

介绍：　

　　jdk1.8 , maven  k

　　开发软件： idea

　　springboot + mybatis +hsqldb

内容：

　　1.项目搭建

　　2.基本操作

　　3.本地数据持久化

第一步 新建maven项目

导入依赖

    <dependencies>
        <dependency>
            <groupId>org.hsqldb</groupId>
            <artifactId>hsqldb</artifactId>
            <version>2.4.0</version>
        </dependency>

        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>1.3.2</version>
        </dependency>
        <!--测试包-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <version>2.0.1.RELEASE</version>
        </dependency>
    </dependencies>

 

 

第二步 初始化表数据

在resource目录下创建,

我这里在resource下的sql目录下创建文件。

schema.sql  ：创建数据表

data.sql  ：向表中插入数据

schema.sql 

CREATE TABLE blog (
  id INTEGER GENERATED BY DEFAULT AS IDENTITY(START WITH 1) NOT NULL PRIMARY KEY,
  title varchar(255) DEFAULT NULL,
);

data.sql 

 

insert into blog(id,title) values(1,'花生皮编程博客');

 

 

第三步 配置数据库

springboot核心配置文件 ：application.yml

 

spring:
  datasource:
    username: hsp
    password: 123456
    url: jdbc:hsqldb:mem://localhost/blogdb;shutdown=true
    driver-class-name: org.hsqldb.jdbcDriver
    schema: classpath:sql/schema.sql
    data: classpath:sql/data.sql
    initialization-mode: always
    continue-on-error: true
mybatis:
  mapper-locations: classpath:mapper/*/*Mapper.xml

url: jdbc:hsqldb:mem://localhost/blogdb;shutdown=true 中mem表示内存模式，数据不会持久化。

 第四步 创建mapper接口，mapper映射文件

 1、创建实体类

package com.blog.pojo;

/**
 * @version 1.0
 * @Description Blog
 * @date Created in 2023-5-16 10:55
 * @since jdk1.8
 */
public class Blog {
    private int id;
    private String title;

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getTitle() {
        return title;
    }

    public void setTitle(String title) {
        this.title = title;
    }

    @Override
    public String toString() {
        return "Blog{" +
                "id=" + id +
                ", title='" + title + '\'' +
                '}';
    }
}

 2、创建接口

package com.blog.mapper;

import com.blog.pojo.Blog;
import org.apache.ibatis.annotations.Mapper;

import java.util.List;

@Mapper
public interface BlogMapper {
    //@Select("SELECT * FROM blog")
    List<Blog> queryList();
    int insert(Blog blog);
}

 

3、创建mapper映射文件

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.blog.mapper.BlogMapper">
    <resultMap id="userResultMap" type="com.blog.pojo.Blog">
        <id property="id" column="id"/>
        <result property="title" column="title"/>
    </resultMap>

    <insert id="insert" parameterType="com.blog.pojo.Blog">
        insert into blog(id,title) values (#{id},#{title})
    </insert>

    <select id="queryList" resultMap="userResultMap">
        SELECT * FROM blog
    </select>
</mapper>

 

4、创建springboot启动类

package com;

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

/**
 * @version 1.0
 * @Description Application
 * @date Created in 2023-5-16 14:22
 * @since jdk1.8
 */
@SpringBootApplication
public class Application {
    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }
}

 

 

5、创建测试类

 

package com.blog.mapper;

import com.Application;
import com.blog.pojo.Blog;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;

import java.util.List;

/**
 * @version 1.0
 * @Description BlogMapperTest
 * @date Created in 2023-5-16 14:21
 * @since jdk1.8
 */
@RunWith(SpringRunner.class)
@SpringBootTest(classes = Application.class)
public class BlogMapperTest {
    @Autowired
    private BlogMapper blogMapper;
    @Test
    public void queryList(){
        List<Blog> blogs = blogMapper.queryList();
        for(Blog blog:blogs){
            System.out.println(blog);
        }

    }
    @Test
    public void ins(){
        Blog blog = new Blog();
        blog.setId(2);
        blog.setTitle("blog");
        blogMapper.insert(blog);
        List<Blog> blogs = blogMapper.queryList();
        for(Blog b:blogs){
            System.out.println(b);
        }

    }
}

测试查询效果：

 

 

测试插入效果：

 

数据持久化：

将配置文件的url修改：

url: jdbc:hsqldb:file:hsqldb/data/blogdb

将会在当前项目根目录下创建 文件夹 hsqldb