springboot中配置多数据源mybatisPlus

文章目录

1 背景
2 版本
3 配置
- 3.1 pom配置
- - 3.1.1 父类pom
  - 3.1.2 pom依赖
  - 3.1.3 插件
- 3.2 application.yml配置
- 3.3 启动类配置
4 使用
- 4.1 建表脚本
- 4.2 实体类
- 4.3 mapper
- 4.4 mapper映射
- 4.5 使用

1 背景

springboot配置mybatisPlus，mybatisPlus配置一主二从数据源。

数据源根据在切面方法上配置@DS注解选择对应的数据源，默认数据源为master。配置@DS("slave")注解，随机从slave_1和slave_1中选择从库数据源。

2 版本

JDK：1.8
mysql：5.6
springboot：2.2.9.RELEASE
mybatis-plus：3.2.0

3 配置

路径说明：

用途	路径
bean	com.sa.example.mybatis.ext.bean
mapper	com.sa.example.mybatis.ext.mapper；com.sa.example.mybatis.auto.mapper
xml	com.sa.example.mybatis.ext.mapper.xml；com.sa.example.mybatis.auto.mapper.xml

3.1 pom配置

3.1.1 父类pom

<parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>2.2.9.RELEASE</version><relativePath/>
</parent>

3.1.2 pom依赖

<!-- ==========mybatisPlus依赖========== -->
<dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><version>5.1.30</version>
</dependency>
<dependency><groupId>com.alibaba</groupId><artifactId>druid</artifactId><version>1.1.23</version>
</dependency>
<dependency><groupId>com.baomidou</groupId><artifactId>mybatis-plus-boot-starter</artifactId><version>3.2.0</version>
</dependency>
<dependency><groupId>com.baomidou</groupId><artifactId>dynamic-datasource-spring-boot-starter</artifactId><version>3.2.0</version>
</dependency>
<!-- ==========springboot-web依赖========== -->
<dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId>
</dependency>
<!-- ==========其他依赖========== -->
<dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-test</artifactId><scope>test</scope>
</dependency>
<dependency><groupId>org.projectlombok</groupId><artifactId>lombok</artifactId><version>1.18.12</version><scope>provided</scope>
</dependency>

3.1.3 插件

保证可以在src的包里配置mapper的xml文件，否则需要再resource文件夹中配置mapper的xml。

<build><plugins><plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId></plugin></plugins><resources><resource><directory>src/main/java</directory><includes><include>**/*.*</include></includes></resource><resource><directory>src/main/resources</directory><includes><include>**/**</include></includes></resource></resources>
</build>

3.2 application.yml配置

spring:# ==========mybatis-plus数据源配置==========datasource:dynamic:primary: master #设置默认的数据源或者数据源组,默认值即为masterstrict: false #设置严格模式,默认false不启动. 启动后在未匹配到指定数据源时候会抛出异常,不启动则使用默认数据源.datasource:master:url: jdbc:mysql://127.0.0.1:3306/test01?useUnicode=true&characterEncoding=utf-8&zeroDateTimeBehavior=round&useAffectedRows=trueusername: rootpassword: rootdriver-class-name: com.mysql.jdbc.Driverdruid:initialSize: 100minIdle: 50maxActive: 200maxWait: 60000timeBetweenEvictionRunsMillis: 60000minEvictableIdleTimeMillis: 300000validationQuery: SELECT 'x'testWhileIdle: truetestOnBorrow: falsetestOnReturn: falsepoolPreparedStatements: falsemaxPoolPreparedStatementPerConnectionSize: -1filters: statslave_1:url: jdbc:mysql://127.0.0.1:3306/test02?useUnicode=true&characterEncoding=utf-8&zeroDateTimeBehavior=round&useAffectedRows=trueusername: rootpassword: rootdriver-class-name: com.mysql.jdbc.Driverdruid:initialSize: 100minIdle: 50maxActive: 200maxWait: 60000timeBetweenEvictionRunsMillis: 60000minEvictableIdleTimeMillis: 300000validationQuery: SELECT 'x'testWhileIdle: truetestOnBorrow: falsetestOnReturn: falsepoolPreparedStatements: falsemaxPoolPreparedStatementPerConnectionSize: -1filters: statslave_2:url: jdbc:mysql://127.0.0.1:3306/test03?useUnicode=true&characterEncoding=utf-8&zeroDateTimeBehavior=round&useAffectedRows=trueusername: rootpassword: rootdriver-class-name: com.mysql.jdbc.Driverdruid:initialSize: 100minIdle: 50maxActive: 200maxWait: 60000timeBetweenEvictionRunsMillis: 60000minEvictableIdleTimeMillis: 300000validationQuery: SELECT 'x'testWhileIdle: truetestOnBorrow: falsetestOnReturn: falsepoolPreparedStatements: falsemaxPoolPreparedStatementPerConnectionSize: -1filters: stat#==========整合mybatisPlus==========
mybatis-plus:type-aliases-package: com.lx.ms.db.mybatis.bean.ext# 配置mybatis的xml路径mapper-locations: classpath:com/sa/example/mybatis/ext/mapper/xml/*.xml,classpath:com/sa/example/mybatis/auto/mapper/xml/*.xmlconfiguration:map-underscore-to-camel-case: truecache-enabled: truelazy-loading-enabled: falseaggressive-lazy-loading: truelog-impl: org.apache.ibatis.logging.stdout.StdOutImpl

3.3 启动类配置

@SpringBootApplication(scanBasePackages = "com.sa.example")
// 配置xml的mapper路径
@MapperScan(basePackages = {"com.sa.example.mybatis.ext.mapper", "com.sa.example.mybatis.auto.mapper"})
public class MybatisApplication {public static void main(String[] args) {SpringApplication.run(MybatisApplication.class, args);}
}

4 使用

4.1 建表脚本

CREATE TABLE `c_m_phone` (`id` int(10) NOT NULL COMMENT 'id',`phone_first` varchar(20) DEFAULT NULL COMMENT '前缀号段',`phone_provence` varchar(20) DEFAULT NULL COMMENT '手机所在省份',`phone_city` varchar(20) DEFAULT NULL COMMENT '手机所在城市',`service` varchar(20) DEFAULT NULL COMMENT '服务商',PRIMARY KEY (`id`)
) COMMENT='电话区域表';

4.2 实体类

//包名：com.sa.example.mybatis.ext.bean
@Data
public class CMPhone {private Integer id;private String phoneFirst;private String phoneProvence;private String phoneCity;private String service;
}

4.3 mapper

// 包名：com.sa.example.mybatis.ext.mapper
public interface CMPhoneMapper {/*** 保存（配置主库）* @param model* @return*/@DS("master")int save(CMPhone model);/*** 查询（配置从库）* @param model* @return*/@DS("slave")List<CMPhone> findList(CMPhone model);
}

4.4 mapper映射

<!-- 包名：com.sa.example.mybatis.ext.mapper.xml -->
<?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.sa.example.mybatis.ext.mapper.CMPhoneMapper"><resultMap id="BaseResultMap" type="com.sa.example.mybatis.ext.bean.CMPhone"><id column="id" property="id" jdbcType="INTEGER"/><result column="phone_first" property="phoneFirst" jdbcType="VARCHAR"/><result column="phone_provence" property="phoneProvence" jdbcType="VARCHAR"/><result column="phone_city" property="phoneCity" jdbcType="VARCHAR"/><result column="service" property="service" jdbcType="VARCHAR"/></resultMap><select id="findList" parameterType="com.sa.example.mybatis.ext.bean.CMPhone" resultMap="BaseResultMap">select id,phone_first,phone_provence,phone_city,service from c_m_phone</select><insert id="save" parameterType="com.sa.example.mybatis.ext.bean.CMPhone">INSERT INTO `c_m_phone` (`id`, `phone_first`, `phone_provence`, `phone_city`, `service`) VALUES (#{id},#{phoneFirst},#{phoneProvence},#{phoneCity},#{service})</insert>
</mapper>

4.5 使用

@RunWith(SpringRunner.class)
@SpringBootTest(classes = MybatisApplication.class)
public class MybatisTest {@Autowiredprivate CMPhoneMapper cmPhoneMapper;@Testpublic void testMapper() {List<CMPhone> cmPhoneList = cmPhoneMapper.findList(new CMPhone());System.out.println(cmPhoneList);}@Testpublic void testSave(){CMPhone model = new CMPhone();model.setId(1000);model.setPhoneCity("PhoneCity test");model.setPhoneFirst("PhoneFirst test");model.setPhoneProvence("PhoneProvence test");model.setService("Service test");cmPhoneMapper.save(model);}
}

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