tk-mybatis与springBoot整合使用两个数据源

根据项目功能需求，需要与第三方公共库对接，需要对公共库进行相关操作，由于不想使用原生jdbc，所以采用mybaits进行多数据配置。

单纯的使用mybaits进行多数据配置网上资料很多，但由于前期为了方便开发，采用了tk-mybaits。关于tk-mybaits多数据源配置没有相关材料，官方也没有提供相关功能说明，所以最终采用mybatis+tk-mybaits分别使用的策略进行多数据源配置功能实现。具体代码如下

一、配置连接信息

 

#开发运行环境数据库
spring.datasource.local.url=jdbc:mysql://0.0.0.0:3306/zhdd
spring.datasource.local.username=root
spring.datasource.local.password=
spring.datasource.local.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.local.druid.initial-size=1
spring.datasource.local.druid.min-idle=1
spring.datasource.local.druid.max-active=20
spring.datasource.local.druid.test-on-borrow=true
spring.datasource.local.druid.stat-view-servlet.allow=true

#第三方对接通用数据库
spring.datasource.public.url=jdbc:mysql://0.0.0.0:3306/zhdd
spring.datasource.public.username=root
spring.datasource.public.password=
spring.datasource.public.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.public.druid.initial-size=1
spring.datasource.public.druid.min-idle=1
spring.datasource.public.druid.max-active=20
spring.datasource.public.druid.test-on-borrow=true
spring.datasource.public.druid.stat-view-servlet.allow=true

 二、配置DataSource数据源

 注意两个数据源中有一个是为主数据源，需要增加一个@Primary注解，有且只能有一个需要。关于2个以上数据源没有额外再进行研究了，不过利用mybatis再额外配置多个数据源应该可以实现

1.数据源1配置

package com.hiynn.core.mybatis;

import com.alibaba.druid.spring.boot.autoconfigure.DruidDataSourceBuilder;
import org.apache.ibatis.session.SqlSessionFactory;
import org.mybatis.spring.SqlSessionFactoryBean;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
import org.springframework.core.io.support.PathMatchingResourcePatternResolver;
import org.springframework.jdbc.datasource.DataSourceTransactionManager;

import javax.sql.DataSource;

/**
 * 开发运行环境数据库
 */
@Configuration
public class LocalDataSourceConfig {

    @Bean(name = "localDataSource")
    @ConfigurationProperties(prefix = "spring.datasource.local")
    @Primary
    public DataSource localDataSource() {
        return DruidDataSourceBuilder.create().build();
    }

    @Bean(name = "localTransactionManager")
    @Primary
    public DataSourceTransactionManager mysqlTransactionManager() {
        return new DataSourceTransactionManager(localDataSource());
    }

    @Bean(name = "localSqlSessionFactory")
    @Primary
    public SqlSessionFactory mysqlSqlSessionFactory(@Qualifier("localDataSource") DataSource dataSource)
            throws Exception {
        SqlSessionFactoryBean sessionFactory = new SqlSessionFactoryBean();
        sessionFactory.setDataSource(dataSource);
        //如果不使用xml的方式配置mapper，则可以省去下面这行mapper location的配置。
        sessionFactory.setMapperLocations(new PathMatchingResourcePatternResolver()
                .getResources("classpath*:mapper/*.xml"));
        return sessionFactory.getObject();
    }
}

2.数据源2配置

package com.hiynn.core.mybatis;

import com.alibaba.druid.spring.boot.autoconfigure.DruidDataSourceBuilder;
import org.apache.ibatis.session.SqlSessionFactory;
import org.mybatis.spring.SqlSessionFactoryBean;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.io.support.PathMatchingResourcePatternResolver;
import org.springframework.jdbc.datasource.DataSourceTransactionManager;

import javax.sql.DataSource;

/**
 * 公共通用数据库
 */
@Configuration
public class PublicDataSourceConfig {

    @Bean(name = "publicDataSource")
    @ConfigurationProperties(prefix = "spring.datasource.public")
    public DataSource publicDataSource() {
        return DruidDataSourceBuilder.create().build();
    }

    @Bean(name = "publicTransactionManager")
    public DataSourceTransactionManager mysqlTransactionManager() {
        return new DataSourceTransactionManager(publicDataSource());
    }

    @Bean(name = "publicSqlSessionFactory")
    public SqlSessionFactory mysqlSqlSessionFactory(@Qualifier("publicDataSource") DataSource dataSource)
            throws Exception {
        SqlSessionFactoryBean sessionFactory = new SqlSessionFactoryBean();
        sessionFactory.setDataSource(dataSource);
        //如果不使用xml的方式配置mapper，则可以省去下面这行mapper location的配置。
        sessionFactory.setMapperLocations(new PathMatchingResourcePatternResolver()
                .getResources("classpath*:mapper2/*.xml"));
        return sessionFactory.getObject();
    }
}

三、Application配置

package com.hiynn.core;

//特别注意，下面的是 tk.MapperScan

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.web.servlet.ServletComponentScan;
import org.springframework.boot.web.servlet.support.SpringBootServletInitializer;
import org.springframework.transaction.annotation.EnableTransactionManagement;
import springfox.documentation.swagger2.annotations.EnableSwagger2;
import tk.mybatis.spring.annotation.MapperScan;

/**
 * @author zz
 * @date 2018-7-2
 */
@ServletComponentScan
@SpringBootApplication
@EnableTransactionManagement
@EnableSwagger2
@MapperScan(basePackages = "com.hiynn.core.**.mapper",sqlSessionFactoryRef = "localSqlSessionFactory")
@org.mybatis.spring.annotation.MapperScan(basePackages = "com.hiynn.core.**.mapper2",sqlSessionFactoryRef = "publicSqlSessionFactory")
public class Application extends SpringBootServletInitializer{
    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }
}

四、Mapper代码结构

补充：

一、解决mybatis数据库驼峰命名自动映射问题以及sql语句打印问题，通过读取配置文件实现。两个数据源都需要设置

    @Bean(name = "localSqlSessionFactory")
    @Primary
    public SqlSessionFactory mysqlSqlSessionFactory(@Qualifier("localDataSource") DataSource dataSource)
            throws Exception {
        SqlSessionFactoryBean sessionFactory = new SqlSessionFactoryBean();
        sessionFactory.setDataSource(dataSource);
        //添加mybatis配置文件读取功能更
        sessionFactory.setConfigLocation(new PathMatchingResourcePatternResolver().getResource("mybatis-config.xml"));
        //如果不使用xml的方式配置mapper，则可以省去下面这行mapper location的配置。
        sessionFactory.setMapperLocations(new PathMatchingResourcePatternResolver()
                .getResources("classpath*:mapper/*.xml"));
        return sessionFactory.getObject();
    }

二、配置PageHelper分页插件，在application.properties统一配置

数据库方言 指定分页插件使用哪种数据库方言
pagehelper.helperDialect=mysql
#分页参数合理化 pageNum<=0 时会查询第一页， pageNum>pages（超过总数时），会查询最后一页
pagehelper.reasonable=true
pagehelper.supportMethodsArguments=true
pagehelper.params=count=countSql