springboot嵌入式数据库derby初探

Apache Derby 是100% Java 编写的内存数据库，属于 Apache 的一个开源项目。并且是一个容易管理的关系数据库管理系统
Apache Derby 是一个与平台无关的数据库引擎，它以 Java 类库的形式对外提供服务。与其他难以部署的数据库不同， Derby 数据库体积小、安装非常简单

主要特点

1.程序小巧，基础引擎和内嵌的JDBC驱动总共大约2MB。

2.基于Java、JDBC和SQL标准。

3.提供内嵌的JDBC驱动，你可把Derby嵌入到基于Java的应用程序中。

4.支持客户端/服务器模式。

5.安装、布置和使用简单。

Derby 数据库的两种运行模式

1. 嵌入式模式。Derby 在应用程序的 JVM中运行。在这种模式下，只有应用程序可以访问数据库，例如另一个用户/应用程序将无法访问数据库。
2. 服务器模式。如果 Derby 在服务器模式下运行，负责处理数据库请求的 Derby 网络服务器，可以把它当成类似mysql等的server服务器，可以供多个客户端应用程序访问

好了，我们直接例一个嵌入式模式下的例子吧，这个单独作为sql server服务器模式的情况下不多，反正我是没看到过

package com.zkb.conf;import io.swagger.annotations.ApiOperation;
import io.swagger.models.auth.In;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import springfox.documentation.builders.ApiInfoBuilder;
import springfox.documentation.builders.PathSelectors;
import springfox.documentation.builders.RequestHandlerSelectors;
import springfox.documentation.service.ApiInfo;
import springfox.documentation.service.ApiKey;
import springfox.documentation.service.Contact;
import springfox.documentation.spi.DocumentationType;
import springfox.documentation.spring.web.plugins.Docket;
import springfox.documentation.swagger2.annotations.EnableSwagger2;import java.util.Arrays;
import java.util.List;@Configuration
@EnableSwagger2
public class SwaggerConfig {@Beanpublic Docket createRestApi1() {return new Docket(DocumentationType.SWAGGER_2).enable(true).apiInfo(apiInfo()).select().apis(RequestHandlerSelectors.withMethodAnnotation(ApiOperation.class)).apis(RequestHandlerSelectors.basePackage("com.zkb.controller")).paths(PathSelectors.any()).build().securitySchemes(apiKeyList()).groupName("系统接口");}private ApiInfo apiInfo() {return new ApiInfoBuilder().title("系统接口文档").description("这是系统接口文档说明").contact(new Contact("h2", "", "")).version("1.0").build();}private List<ApiKey> apiKeyList() {return Arrays.asList(new ApiKey("登录token", "token", In.HEADER.name()),new ApiKey("设备类型(android,ios,pc)---必填", "deviceType", In.HEADER.name()));}
}

package com.zkb.controller;import com.zkb.entity.Student;
import com.zkb.mapper.StudentMapper;
import com.zkb.service.StudentService;
import io.swagger.annotations.Api;
import io.swagger.annotations.ApiOperation;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;import java.util.List;@RequestMapping("/test")
@RestController
@Api(value = "Student", tags = "Student")
public class TestController {@AutowiredStudentService studentService;@GetMapping("list")@ApiOperation(value = "获取列表")public List<Student> getList(){return studentService.list();}
}

package com.zkb.entity;import com.baomidou.mybatisplus.annotation.TableName;
import com.baomidou.mybatisplus.extension.activerecord.Model;
import lombok.Data;
import lombok.EqualsAndHashCode;@Data
@EqualsAndHashCode(callSuper = false)
@TableName("student")
public class Student extends Model<Student> {private Integer id;private String name;private Integer age;
}

package com.zkb.mapper;import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.zkb.entity.Student;public interface StudentMapper extends BaseMapper<Student> {void createStudentTable();
}

package com.zkb.service.impl;import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.zkb.entity.Student;
import com.zkb.mapper.StudentMapper;
import com.zkb.service.StudentService;
import org.springframework.stereotype.Service;@Service
public class StudentServiceImpl extends ServiceImpl<StudentMapper, Student> implements StudentService {@Overridepublic void createStudentTable() {baseMapper.createStudentTable();}
}

package com.zkb.service;import com.baomidou.mybatisplus.extension.service.IService;
import com.zkb.entity.Student;public interface StudentService extends IService<Student> {void createStudentTable();
}

package com.zkb;import com.zkb.entity.Student;
import com.zkb.service.StudentService;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import springfox.documentation.swagger2.annotations.EnableSwagger2;import javax.annotation.PostConstruct;
import java.util.ArrayList;
import java.util.List;@SpringBootApplication
@MapperScan("com.zkb.mapper")
@EnableSwagger2
public class DerbyTestApplication {public static void main(String[] args) {SpringApplication.run(DerbyTestApplication.class, args);}@AutowiredStudentService studentService;@PostConstructpublic void init(){studentService.createStudentTable();List<Student> list= new ArrayList<>();Student student = new Student();student.setId(1);student.setName("张三");student.setAge(20);Student student1 = new Student();student1.setId(2);student1.setName("李四");student1.setAge(21);list.add(student);list.add(student1);studentService.saveBatch(list);}}

<?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.zkb.mapper.StudentMapper"><!-- 通用查询映射结果 --><resultMap id="BaseResultMap" type="com.zkb.entity.Student"><id column="id" property="id" /><result column="name" property="name" /><result column="age" property="age" /></resultMap><update id="createStudentTable">CREATE TABLE student(id int not null,name varchar(20),age int)</update></mapper>

server:port: 8888
dbBaseDir: /tmp/derby
spring:datasource:type: com.alibaba.druid.pool.DruidDataSourcedriver-class-name: org.apache.derby.jdbc.EmbeddedDriverurl: jdbc:derby:${dbBaseDir}/MyDB;create=trueusername: rootpassword: 123456jackson:date-format: yyyy-MM-dd HH:mm:sstime-zone: GMT+8
logging:level:com:fs: debug
mybatis-plus:configuration:map-underscore-to-camel-case: trueauto-mapping-behavior: fulllog-impl: org.apache.ibatis.logging.stdout.StdOutImplmapper-locations: classpath:mapping/*.xmlglobal-config:# 逻辑删除配置db-config:# 删除前logic-not-delete-value: 0# 删除后logic-delete-value: 1

<?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>2.5.2</version><relativePath/> <!-- lookup parent from repository --></parent><groupId>com.zkb</groupId><artifactId>derby-test</artifactId><version>0.0.1-SNAPSHOT</version><name>derby-test</name><description>derby-test</description><properties><java.version>1.8</java.version><mybatis-plus.version>3.3.2</mybatis-plus.version><swagger-ui.version>1.5.22</swagger-ui.version><springfox.version>2.9.2</springfox.version><swagger-bootstrap-ui.version>1.9.1</swagger-bootstrap-ui.version><fastjson.version>1.2.47</fastjson.version></properties><dependencies><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency><!--derby内嵌数据库依赖--><dependency><groupId>org.apache.derby</groupId><artifactId>derby</artifactId><version>10.13.1.1</version></dependency><!--druid数据源依赖--><dependency><groupId>com.alibaba</groupId><artifactId>druid</artifactId><version>1.0.31</version></dependency><dependency><groupId>org.projectlombok</groupId><artifactId>lombok</artifactId><optional>true</optional></dependency><dependency><groupId>com.baomidou</groupId><artifactId>mybatis-plus-boot-starter</artifactId><version>${mybatis-plus.version}</version></dependency><dependency><groupId>io.springfox</groupId><artifactId>springfox-swagger2</artifactId><version>${springfox.version}</version><exclusions><exclusion><groupId>io.swagger</groupId><artifactId>swagger-annotations</artifactId></exclusion><exclusion><groupId>io.swagger</groupId><artifactId>swagger-models</artifactId></exclusion></exclusions></dependency><dependency><groupId>io.swagger</groupId><artifactId>swagger-annotations</artifactId><version>${swagger-ui.version}</version></dependency><dependency><groupId>io.swagger</groupId><artifactId>swagger-models</artifactId><version>${swagger-ui.version}</version></dependency><!-- https://mvnrepository.com/artifact/io.springfox/springfox-swagger-ui --><dependency><groupId>io.springfox</groupId><artifactId>springfox-swagger-ui</artifactId><version>${springfox.version}</version></dependency><dependency><groupId>com.github.xiaoymin</groupId><artifactId>swagger-bootstrap-ui</artifactId><version>${swagger-bootstrap-ui.version}</version></dependency><dependency><groupId>com.alibaba</groupId><artifactId>fastjson</artifactId><version>${fastjson.version}</version></dependency></dependencies><build><plugins><plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId><configuration><excludes><exclude><groupId>org.projectlombok</groupId><artifactId>lombok</artifactId></exclude></excludes></configuration></plugin></plugins></build></project>

运行demo后会产生一个MyDB的文件夹以上便是该文件夹里面的内容

demo里面我写了一个初始化的方法，第二次运行要把对应的内容注释掉，不然会报表已存在错误

可以看到，我已经查从derby数据库查出数据了，到这里demo就结束了

demo地址:https://download.csdn.net/download/qq_14926283/86543026