SpringBoot整合Mybatis Plus多数据源的实现示例

导读

有一个这样子的需求，线上正在跑的业务，由于业务发展需要，需重新开发一套新系统，等新系统开发完成后，需要无缝对接切换，当初具体设计见草图。

添加依赖

<!--lombok-->
      <dependency>
          <groupId>org.projectlombok</groupId>
          <artifactId>lombok</artifactId>
          <version>1.18.16</version>
          <!--scope=provided，说明它是在编译阶段生效，不需要打入包中，Lombok在编译期将带Lombok注解的Java文件正确编译为完整的Class文件-->
          <scope>provided</scope>
      </dependency>
      <!--mysql-->
      <dependency>
          <groupId>mysql</groupId>
          <artifactId>mysql-connector-java</artifactId>
      </dependency>
      <!--mybatis plus和spring boot整合-->
      <dependency>
          <groupId>com.baomidou</groupId>
          <artifactId>mybatis-plus-boot-starter</artifactId>
          <version>3.4.0</version>
      </dependency>
      <dependency>
          <groupId>com.alibaba</groupId>
          <artifactId>druid</artifactId>
          <version>1.1.10</version>
      </dependency>

application.properties

server.port=9999
spring.datasource.master.driver-class-name=com.mysql.cj.jdbc.Driver
spring.datasource.master.url=jdbc:mysql://127.0.0.1/test?useUnicode=true&characterEncoding=utf-8&useSSL=false
spring.datasource.master.username=root
spring.datasource.master.password=root

spring.datasource.slave.driver-class-name=com.mysql.cj.jdbc.Driver
spring.datasource.slave.jdbc-url=jdbc:mysql://127.0.0.1/test2?useUnicode=true&characterEncoding=utf-8&useSSL=false
spring.datasource.slave.username=root
spring.datasource.slave.password=root

2种方式创建DataSource

Master配置，使用druid连接池

import com.alibaba.druid.pool.DruidDataSource;
import com.baomidou.mybatisplus.extension.spring.MybatisSqlSessionFactoryBean;
import org.apache.ibatis.session.SqlSessionFactory;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
import org.springframework.core.env.Environment;

import javax.sql.DataSource;

/**
* @Author：chenyanbin
*/
@Configuration
@MapperScan(basePackages = "com.example.demo.mapper", sqlSessionFactoryRef = "masterSqlSessionFactory")
public class MasterDataSourceConfig {
  @Autowired
  private Environment env;

  @Primary
  @Bean(name = "masterDataSource")
//    @ConfigurationProperties("spring.datasource.master")
  public DataSource masterDataSource() {
//        return DataSourceBuilder.create().build();
      DruidDataSource dataSource = new DruidDataSource();
      dataSource.setUrl(env.getProperty("spring.datasource.master.url"));
      dataSource.setUsername(env.getProperty("spring.datasource.master.username"));
      dataSource.setPassword(env.getProperty("spring.datasource.master.password"));
      dataSource.setDriverClassName(env.getProperty("spring.datasource.master.driver-class-name"));
      //配置初始化大小、最小、最大
      dataSource.setMinIdle(10);
      //配置初始化大小、最小、最大
      dataSource.setMaxActive(200);
      //配置初始化大小、最小、最大
      dataSource.setInitialSize(10);
      //配置获取连接等待超时的时间
      dataSource.setMaxWait(60000);
      //配置一个连接在池中最小生存的时间,单位是毫秒
      dataSource.setMinEvictableIdleTimeMillis(300000);
      //配置间隔多久才进行一次检测,检测需要关闭的空闲连接,单位是毫秒
      dataSource.setTimeBetweenEvictionRunsMillis(60000);
      //默认的testWhileIdle=true,testOnBorrow=false,testOnReturn=false
      dataSource.setValidationQuery("SELECT 1");
      //申请连接时执行validationQuery检测连接是否有效
      dataSource.setTestOnBorrow(false);
      //建议配置为true，不影响性能，并且保证安全性。
      dataSource.setTestWhileIdle(true);
      //是否缓存preparedStatement，也就是PSCache
      dataSource.setPoolPreparedStatements(false);
      return dataSource;
  }

  @Bean(name = "masterSqlSessionFactory")
  public SqlSessionFactory sqlSessionFactory(@Qualifier("masterDataSource") DataSource dataSource) throws Exception {
      MybatisSqlSessionFactoryBean sessionFactoryBean = new MybatisSqlSessionFactoryBean();
      sessionFactoryBean.setDataSource(dataSource);

      return sessionFactoryBean.getObject();
  }
}

Slave配置

import com.baomidou.mybatisplus.extension.spring.MybatisSqlSessionFactoryBean;
import org.apache.ibatis.session.SqlSessionFactory;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.boot.jdbc.DataSourceBuilder;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import javax.sql.DataSource;

/**
* @Author：chenyanbin
*/
@Configuration
@MapperScan(basePackages = "com.example.demo.mapper2",sqlSessionFactoryRef = "slaveSqlSessionFactory")
public class SlaveDataSourceConfig {
  @Bean(name = "slaveDataSource")
  @ConfigurationProperties("spring.datasource.slave")
  public DataSource slaveDataSource(){
      return DataSourceBuilder.create().build();
  }

  @Bean(name = "slaveSqlSessionFactory")
  public SqlSessionFactory sqlSessionFactory(@Qualifier("slaveDataSource") DataSource dataSource) throws Exception {
      MybatisSqlSessionFactoryBean sessionFactoryBean = new MybatisSqlSessionFactoryBean();
      sessionFactoryBean.setDataSource(dataSource);
      return sessionFactoryBean.getObject();
  }
}

注意

　　master和slave扫描不同的mapper包路径！！！！！！

　　如果需要指定.xml文件，需这样配置！！！

  @Bean(name = "masterSqlSessionFactory")
  public SqlSessionFactory sqlSessionFactory(@Qualifier("masterDataSource") DataSource dataSource) throws Exception {
      MybatisSqlSessionFactoryBean sessionFactoryBean = new MybatisSqlSessionFactoryBean();
      sessionFactoryBean.setDataSource(dataSource);
      sessionFactoryBean.setMapperLocations(new PathMatchingResourcePatternResolver()
              .getResources("classpath:mapper/**/*.xml"));
      return sessionFactoryBean.getObject();
  }

MybatisPlus分页插件设置

import com.baomidou.mybatisplus.extension.plugins.MybatisPlusInterceptor;
import com.baomidou.mybatisplus.extension.plugins.inner.PaginationInnerInterceptor;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

/**
* MybatisPlus分页配置
*
* @Author：chenyanbin
*/
@Configuration
public class MybatisPlusPageConfig {

  /**
   * 新版分页插件
   *
   * @return
   */
  @Bean
  public MybatisPlusInterceptor mybatisPlusInterceptor() {
      MybatisPlusInterceptor mybatisPlusInterceptor = new MybatisPlusInterceptor();
      mybatisPlusInterceptor.addInnerInterceptor(new PaginationInnerInterceptor());
      return mybatisPlusInterceptor;
  }
}

@Bean(name = "masterSqlSessionFactory")
  public SqlSessionFactory sqlSessionFactory(
          @Qualifier("masterDataSource") DataSource dataSource,
          @Qualifier("mybatisPlusInterceptor") MybatisPlusInterceptor mybatisPlusInterceptor
  ) throws Exception {
      MybatisSqlSessionFactoryBean sessionFactoryBean = new MybatisSqlSessionFactoryBean();
      sessionFactoryBean.setDataSource(dataSource);
      sessionFactoryBean.setMapperLocations(new PathMatchingResourcePatternResolver()
              .getResources("classpath:mapper/**/*.xml"));
      sessionFactoryBean.setPlugins(mybatisPlusInterceptor);
      return sessionFactoryBean.getObject();
  }

启动类

@SpringBootApplication(
exclude = {DataSourceAutoConfiguration.class, MybatisPlusAutoConfiguration.class}
)

启动类上排查，自动装配，使用我们自定义的多数据源！！！

演示

　　多个数据源，同时也是支持事务的

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原文链接：https://www.cnblogs.com/chenyanbin/p/15504125.html