Description of local development environment
| development dependencies | Version |
|---|---|
| Spring Boot | 3.0.6 |
| Mybatis-Plus | 3.5.3.1 |
| dynamic-datasource-spring-boot-starter | 3.6.1 |
| JDK | 20 |
pom.xml mainly depends on
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>com.baomidou</groupId>
<artifactId>mybatis-plus-boot-starter</artifactId>
</dependency>
<dependency>
<groupId>com.baomidou</groupId>
<artifactId>dynamic-datasource-spring-boot-starter</artifactId>
</dependency>
<!-- 根据需要修改数据库 -->
<dependency>
<groupId>com.h2database</groupId>
<artifactId>h2</artifactId>
</dependency>
</dependencies>
application.yml main configuration
debug: true
logging:
level:
root: debug
spring:
datasource:
dynamic:
# druid连接池设置
druid:
# 配置初始化大小、最小、最大线程数
initialSize: 5
minIdle: 5
# CPU核数+1，也可以大些但不要超过20，数据库加锁时连接过多性能下降
maxActive: 20
# 最大等待时间，内网：800，外网：1200（三次握手1s）
maxWait: 60000
timeBetweenEvictionRunsMillis: 60000
# 配置一个连接在池中最大空间时间，单位是毫秒
minEvictableIdleTimeMillis: 300000
validationQuery: SELECT 1
testWhileIdle: true
# 设置从连接池获取连接时是否检查连接有效性，true检查，false不检查
testOnBorrow: true
# 设置从连接池归还连接时是否检查连接有效性，true检查，false不检查
testOnReturn: true
# 可以支持PSCache（提升写入、查询效率）
poolPreparedStatements: true
# 配置监控统计拦截的filters，去掉后监控界面sql无法统计，'wall'用于防火墙
filters: stat,wall,slf4j
# 保持长连接
keepAlive: true
maxPoolPreparedStatementPerConnectionSize: 20
useGlobalDataSourceStat: true
connectionProperties: druid.stat.mergeSql=true;druid.stat.slowSqlMillis=500
web-stat-filter:
# 是否启用StatFilter默认值true
enabled: true
# 添加过滤规则
url-pattern: /*
# 忽略过滤的格式
exclusions: /druid/*,*.js,*.gif,*.jpg,*.png,*.css,*.ico
stat-view-servlet:
# 是否启用StatViewServlet默认值true
enabled: true
# 访问路径为/druid时，跳转到StatViewServlet
url-pattern: /druid/*
# 是否能够重置数据
reset-enable: false
# 需要账号密码才能访问控制台，默认为root
login-username: druid
login-password: druid
# IP白名单
allow: 127.0.0.1
# IP黑名单（共同存在时，deny优先于allow）
deny:
# dynamic主从设置
primary: first #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回抛出异常,不启动会使用默认数据源.
datasource:
first:
driver-class-name: org.h2.Driver
url: jdbc:h2:tcp://localhost/D:/ProgramFiles/h2database/data/test;MODE=MYSQL;
username:
password:
type: com.alibaba.druid.pool.DruidDataSource
second:
driver-class-name: org.h2.Driver
url: jdbc:h2:tcp://localhost/D:/ProgramFiles/h2database/data/test;MODE=MYSQL;
username:
password:
type: com.alibaba.druid.pool.DruidDataSource
mybatis-plus:
# 所有实体类所在包路径
type-aliases-package: com.wen3.**.po
# mapper.xmml文件路径，多个使用逗号分隔
mapper-locations: classpath*:resources/mapper/*.xml
configuration:
log-impl: org.apache.ibatis.logging.slf4j.Slf4jImpl
Multi-data source integration Druid
SpringBoot startup class modification
package com.wen3.demo.mybatisplus;
import com.alibaba.druid.spring.boot3.autoconfigure.DruidDataSourceAutoConfigure;
import com.alibaba.druid.spring.boot3.autoconfigure.properties.DruidStatProperties;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.jdbc.DataSourceProperties;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
@MapperScan(basePackages = "com.wen3.demo.mybatisplus.dao")
@SpringBootApplication(exclude = {
DruidDataSourceAutoConfigure.class
})
@EnableConfigurationProperties({
DruidStatProperties.class, DataSourceProperties.class})
public class DemoMybatisplusApplication {
public static void main(String[] args) {
SpringApplication.run(DemoMybatisplusApplication.class, args);
}
}
org.springframework.boot.autoconfigure.AutoConfiguration.imports
Since the automatic loading of the DruidDataSourceAutoConfigure class is excluded, the following classes need to be manually specified and assembled
com.alibaba.druid.spring.boot3.autoconfigure.stat.DruidSpringAopConfiguration
com.alibaba.druid.spring.boot3.autoconfigure.stat.DruidStatViewServletConfiguration
com.alibaba.druid.spring.boot3.autoconfigure.stat.DruidWebStatFilterConfiguration
com.alibaba.druid.spring.boot3.autoconfigure.stat.DruidFilterConfiguration
Looking at the source code of the DruidDataSourceAutoConfigure class, we can see that several classes brought in by @Import need to be automatically assembled
@Configuration
@ConditionalOnClass({DruidDataSource.class})
@AutoConfigureBefore({DataSourceAutoConfiguration.class})
@EnableConfigurationProperties({DruidStatProperties.class, DataSourceProperties.class})
@Import({DruidSpringAopConfiguration.class, DruidStatViewServletConfiguration.class, DruidWebStatFilterConfiguration.class, DruidFilterConfiguration.class})
public class DruidDataSourceAutoConfigure {
}
Druid monitoring page
You can see that multiple data sources have been configured successfully, and Druid monitoring has been added
Junit unit test
UserMapper.java
package com.wen3.demo.mybatisplus.dao;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.wen3.demo.mybatisplus.po.UserPo;
import org.apache.ibatis.annotations.Param;
import org.apache.ibatis.annotations.Select;
import java.util.Map;
/**
* <p>
* Mapper 接口
* </p>
*
* @since 2023-05-21
*/
public interface UserMapper extends BaseMapper<UserPo> {
@Select("select i.* from XXL_JOB_INFO i join XXL_JOB_GROUP g on i.job_group=g.id ${ew.customSqlSegment} ")
Map<String,Object> multiTableQuery(@Param("ew") QueryWrapper<UserPo> query);
}
User2Mapper.java
package com.wen3.demo.mybatisplus.dao;
import com.baomidou.dynamic.datasource.annotation.DS;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.wen3.demo.mybatisplus.dao.UserMapper;
import com.wen3.demo.mybatisplus.po.UserPo;
import org.apache.ibatis.annotations.Param;
import org.apache.ibatis.annotations.Select;
import java.util.Map;
/**
* <p>
* Mapper 接口
* </p>
*
* @author tangheng
* @since 2023-05-21
*/
@DS("second")
public interface User2Mapper extends BaseMapper<UserPo> {
@Select("select i.* from XXL_JOB_INFO i join XXL_JOB_GROUP g on i.job_group=g.id ${ew.customSqlSegment} ")
Map<String,Object> multiTableQuery(@Param("ew") QueryWrapper<UserPo> query);
}
Use
@DSannotations to specify the data source used, and canServiealso be placed on other classes, or on specific class methods
User2MapperTest.java
package com.wen3.demo.mybatisplus.dao2;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.wen3.demo.mybatisplus.MybatisPlusSpringbootTestBase;
import com.wen3.demo.mybatisplus.dao.User2Mapper;
import com.wen3.demo.mybatisplus.dao.UserMapper;
import com.wen3.demo.mybatisplus.po.UserPo;
import jakarta.annotation.Resource;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import java.util.Map;
class User2MapperTest extends MybatisPlusSpringbootTestBase {
@Resource
private User2Mapper user2Mapper;
@Resource
private UserMapper userMapper;
@Test
void testMultiTableQuery() {
QueryWrapper<UserPo> queryWrapper = new QueryWrapper<>();
Map<String, Object> testResult = userMapper.multiTableQuery(queryWrapper);
Map<String, Object> testResult2 = user2Mapper.multiTableQuery(queryWrapper);
assertEquals(testResult.size(), testResult2.size());
}
}
Unit test run log
Access the primary data source by default
Specifies to use the second data source