11.SpringBoot整合DBLE分库分表和读写分离

原创

wx63560c7d74933 2023-02-04 08:14:04 博主文章分类：从头开始学MySQL ©著作权

文章标签 spring boot mybatis java spring Test 文章分类 运维

©著作权归作者所有：来自51CTO博客作者wx63560c7d74933的原创作品，请联系作者获取转载授权，否则将追究法律责任

1.架构

通过分库分表的高可用章节搭建的MySQL架构，在此基础上，整合SpringBoot，实现分库分表和读写分离。

11.SpringBoot整合DBLE分库分表和读写分离_spring

2.整合SpringBoot
(1).引入依赖

<dependency>
  <groupId>mysql</groupId>
  <artifactId>mysql-connector-java</artifactId>
</dependency>
<dependency>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-starter-jdbc</artifactId>
</dependency>
<dependency>
  <groupId>org.mybatis.spring.boot</groupId>
  <artifactId>mybatis-spring-boot-starter</artifactId>
  <version>1.1.1</version>
</dependency>
<dependency>
  <groupId>org.projectlombok</groupId>
  <artifactId>lombok</artifactId>
  <version>1.18.2</version>
  <scope>provided</scope>
</dependency>

(2).添加配置
在application.properties文件中添加如下配置信息。

############################################################
#
# MySQL配置
#
############################################################
### DBLE数据端连接信息，testdb为虚拟数据库
spring.datasource.url = jdbc:mysql://121.4.211.73:8066/testdb
### 用户名
spring.datasource.username = root
### 密码
spring.datasource.password = 123456
### 驱动
spring.datasource.driver-class-name = com.mysql.cj.jdbc.Driver

############################################################
#
# MyBatis配置
#
############################################################
### po类存放目录
mybatis.type-aliases-package = com.example.springboot.dao.po
### mapper(.xml)资源文件存放路径
mybatis.mapper-locations = classpath:mybatis/mapper/*.xml

(3).开发服务端通用返回对象
在项目目录“/src/main/java/com/example/springboot”下新建common目录，并在common目录下新建ResponseCode枚举类和ServerResponse类，具体代码如下。

public enum ResponseCode {
    //1.定义枚举值
    ERROR(0,"ERROR"),

    SUCCESS(1,"SUCCESS");

    //2.定义枚举属性
    private final int code;

    private final String desc;

    //3.定义构造函数
    ResponseCode(int code, String desc){
        this.code = code;
        this.desc = desc;
    }

    //4.定义get方法
    public int getCode(){
        return code;
    }

    public String getDesc(){
        return desc;
    }
}

@JsonSerialize(include = JsonSerialize.Inclusion.NON_NULL)
//保证序列化json的时候,如果是null的对象,key也会消失
public class ServerResponse<T> implements Serializable {
    //1.定义属性
    private int status;

    private String message;

    private T data;

    //2.定义构造函数
    private ServerResponse(int status) {
        this.status = status;
    }

    private ServerResponse(int status, T data) {
        this.status = status;
        this.data = data;
    }

    private ServerResponse(int status, String message, T data) {
        this.status = status;
        this.message = message;
        this.data = data;
    }

    private ServerResponse(int status, String message) {
        this.status = status;
        this.message = message;
    }

    //3.getter方法
    public int getStatus() {
        return status;
    }

    public T getData() {
        return data;
    }

    public String getMessage() {
        return message;
    }

    @JsonIgnore
    //使之不在json序列化结果当中
    //4.判断这个响应是不是一个正确的响应
    public boolean isSuccess() {
        return this.status == ResponseCode.SUCCESS.getCode();
    }

    //5.定义返回对象的方法
    public static <T> ServerResponse<T> createBySuccess() {
        return new ServerResponse<T>(ResponseCode.SUCCESS.getCode());
    }

    public static <T> ServerResponse<T> createBySuccessMessage(String message) {
        return new ServerResponse<T>(ResponseCode.SUCCESS.getCode(), message);
    }

    public static <T> ServerResponse<T> createBySuccess(T data) {
        return new ServerResponse<T>(ResponseCode.SUCCESS.getCode(), data);
    }

    public static <T> ServerResponse<T> createBySuccess(String message, T data) {
        return new ServerResponse<T>(ResponseCode.SUCCESS.getCode(), message, data);
    }

    public static <T> ServerResponse<T> createByError() {
        return new ServerResponse<T>(ResponseCode.ERROR.getCode(), ResponseCode.ERROR.getDesc());
    }

    public static <T> ServerResponse<T> createByErrorMessage(String errorMessage) {
        return new ServerResponse<T>(ResponseCode.ERROR.getCode(), errorMessage);
    }

    public static <T> ServerResponse<T> createByErrorCodeMessage(int errorCode, String errorMessage) {
        return new ServerResponse<T>(errorCode, errorMessage);
    }

    public static <T> ServerResponse<T> createByErrorCodeMessageData(int errorCode, String errorMessage,T data) {
        return new ServerResponse<T>(errorCode, errorMessage,data);
    }
}

(4).dao层开发
首先在项目目录“/src/main/java/com/example/springboot”下新建“/dao/po”目录，并在po目录下新建Test类，具体代码如下。

@Data
@NoArgsConstructor
@AllArgsConstructor
@ToString
public class Test {
    private Integer id;

    private String content;
}

然后在dao目录下新建mapper目录，并在mapper目录下新建TestMapper接口，具体代码如下。

@Repository
public interface TestMapper {
    Test testSelect(Integer id);

    Integer testInsert(Test test);
}

最后在resource目录下新建“mybatis/mapper”目录，并在mapper目录下新建TestMapper.xml文件，具体代码如下。

<?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.example.springboot.dao.mapper.TestMapper">
    <resultMap id="BaseResultMap" type="com.example.springboot.dao.po.Test">
        <constructor>
            <idArg column="id" javaType="java.lang.Integer" jdbcType="INTEGER"/>
            <arg column="content" javaType="java.lang.String" jdbcType="VARCHAR"/>
        </constructor>
    </resultMap>
    <select id="testSelect" parameterType="java.lang.Integer" resultMap="BaseResultMap">
        select  id, content
        from tb_range_sharding
        where id = #{id,jdbcType=INTEGER}
    </select>

    <insert id="testInsert" parameterType="com.example.springboot.dao.po.Test">
        insert into tb_range_sharding
        values(#{id},#{content})
    </insert>
</mapper>

(5).service层开发
在项目目录“/src/main/java/com/example/springboot”下新建service目录，并在service目录下新建ITest接口，具体代码如下。

public interface ITest {
    ServerResponse testSelect(Integer id);

    ServerResponse testInsert(Test test);
}

然后在service目录下新建impl目录，并在impl目录下新建TestImpl实现类，具体代码如下。

@Service
public class TestImpl implements ITest {
    @Autowired
    TestMapper testMapper;

    @Override
    public ServerResponse testSelect(Integer id) {
        Test test = testMapper.testSelect(id);
        if (test == null) {
            return ServerResponse.createByErrorMessage("没有查询到数据");
        }
        return ServerResponse.createBySuccess(test);
    }

    @Override
    public ServerResponse testInsert(Test test) {
        Integer rs = testMapper.testInsert(test);
        if (rs != 1) {
            return ServerResponse.createByErrorMessage("插入失败");
        }
        return ServerResponse.createBySuccess();
    }
}

(6).controller层开发
在项目目录“/src/main/java/com/example/springboot”下新建controller目录，并在controller目录下新建TestController类，具体代码如下。

@Controller
@RequestMapping("/test")
public class TestController {
    @Autowired
    TestImpl testImpl;

    @RequestMapping(value = "/testSelect", method = RequestMethod.POST)
    @ResponseBody
    public ServerResponse testSelect(@RequestBody Test test) {
        return testImpl.testSelect(test.getId());
    }

    @RequestMapping(value = "/testInsert", method = RequestMethod.POST)
    @ResponseBody
    public ServerResponse testInsert(@RequestBody Test test) {
        return testImpl.testInsert(test);
    }
}

(7).启动项目
在启动类MyBatisApplication上添加注解“@MapperScan(basePackages = “com.example.springboot.dao.mapper”)”，然后启动项目。

@MapperScan(basePackages = "com.example.springboot.dao.mapper")
@SpringBootApplication
public class SpringBootDemoApplication {

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

}

(8).工程目录结构

11.SpringBoot整合DBLE分库分表和读写分离_spring_02