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
org.springframework.boot
spring-boot-starter-parent
2.2.9.RELEASE
3.1.2 pom依赖
mysql
mysql-connector-java
5.1.30
com.alibaba
druid
1.1.23
com.baomidou
mybatis-plus-boot-starter
3.2.0
com.baomidou
dynamic-datasource-spring-boot-starter
3.2.0
org.springframework.boot
spring-boot-starter-web
org.springframework.boot
spring-boot-starter-test
test
org.projectlombok
lombok
1.18.12
provided
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。
org.springframework.boot
spring-boot-maven-plugin
src/main/java
**/*.*
src/main/resources
**/**
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master
strict: 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=true
username: root
password: root
driver-class-name: com.mysql.jdbc.Driver
druid:
initialSize: 100
minIdle: 50
maxActive: 200
maxWait: 60000
timeBetweenEvictionRunsMillis: 60000
minEvictableIdleTimeMillis: 300000
validationQuery: SELECT 'x'
testWhileIdle: true
testOnBorrow: false
testOnReturn: false
poolPreparedStatements: false
maxPoolPreparedStatementPerConnectionSize: -1
filters: stat
slave_1:
url: jdbc:mysql://127.0.0.1:3306/test02?useUnicode=true&characterEncoding=utf-8&zeroDateTimeBehavior=round&useAffectedRows=true
username: root
password: root
driver-class-name: com.mysql.jdbc.Driver
druid:
initialSize: 100
minIdle: 50
maxActive: 200
maxWait: 60000
timeBetweenEvictionRunsMillis: 60000
minEvictableIdleTimeMillis: 300000
validationQuery: SELECT 'x'
testWhileIdle: true
testOnBorrow: false
testOnReturn: false
poolPreparedStatements: false
maxPoolPreparedStatementPerConnectionSize: -1
filters: stat
slave_2:
url: jdbc:mysql://127.0.0.1:3306/test03?useUnicode=true&characterEncoding=utf-8&zeroDateTimeBehavior=round&useAffectedRows=true
username: root
password: root
driver-class-name: com.mysql.jdbc.Driver
druid:
initialSize: 100
minIdle: 50
maxActive: 200
maxWait: 60000
timeBetweenEvictionRunsMillis: 60000
minEvictableIdleTimeMillis: 300000
validationQuery: SELECT 'x'
testWhileIdle: true
testOnBorrow: false
testOnReturn: false
poolPreparedStatements: false
maxPoolPreparedStatementPerConnectionSize: -1
filters: 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/*.xml
configuration:
map-underscore-to-camel-case: true
cache-enabled: true
lazy-loading-enabled: false
aggressive-lazy-loading: true
log-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 findList(CMPhone model);
}
4.4 mapper映射
INSERT INTO `c_m_phone` (`id`, `phone_first`, `phone_provence`, `phone_city`, `service`) VALUES (
#{id},#{phoneFirst},#{phoneProvence},#{phoneCity},#{service}
)
4.5 使用
@RunWith(SpringRunner.class)
@SpringBootTest(classes = MybatisApplication.class)
public class MybatisTest {
@Autowired
private CMPhoneMapper cmPhoneMapper;
@Test
public void testMapper() {
List cmPhoneList = cmPhoneMapper.findList(new CMPhone());
System.out.println(cmPhoneList);
}
@Test
public 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);
}
}