springboot+druid+mybatis 多数据源项目搭建（2个mysql+1个sqlserver）

• 具体实现思路：

@MapperScan中  ”sqlSessionTemplateRef ” 可以指定 sqlSessionTemplate 管理类，sqlSessionTemplate的构造方法中需要SqlSessionFactory实例，SqlSessionFactory实现了 绑定数据源的方法。

• 通过 多个@MapperScan绑定多个数据源，具体实现如下：、

目录结构：

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.2.5.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.qlt</groupId>
    <artifactId>tracing</artifactId>
    <version>1.0</version>
    <name>tracing</name>
    <description>XX项目</description>

    <properties>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>



        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.1.10</version>
        </dependency>

        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>2.1.1</version>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <!-- mysql -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>
        <!--  sqlserver   -->
        <dependency>
            <groupId>com.microsoft.sqlserver</groupId>
            <artifactId>mssql-jdbc</artifactId>
            <version>6.4.0.jre8</version>
            <scope>runtime</scope>
        </dependency>

        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
            <exclusions>
                <exclusion>
                    <groupId>org.junit.vintage</groupId>
                    <artifactId>junit-vintage-engine</artifactId>
                </exclusion>
            </exclusions>
        </dependency>


    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

yml配置：

spring:
  datasource:
      self:     #数据源1
        driverClassName: com.mysql.cj.jdbc.Driver
        url: jdbc:mysql://127.0.0.1:3366/demo_ry?serverTime=Aisa/Shanghai&useUnicode=true&characterEncoding=UTF-8
        username: sa
        password: admin123456
        type: com.alibaba.druid.pool.DruidDataSource
      ueight:    #数据源2
        driverClassName: com.mysql.cj.jdbc.Driver
        url: jdbc:mysql://127.0.0.1:3366/demo_trace?serverTime=Aisa/Shanghai&useUnicode=true&characterEncoding=UTF-8
        username: sa
        password: admin123456
        type: com.alibaba.druid.pool.DruidDataSource
      tail:     #数据源3
        driverClassName: com.microsoft.sqlserver.jdbc.SQLServerDriver
        url: jdbc:sqlserver://localhost:1433;DatabaseName=demo
        username: sa
        password: admin123456
        type: com.alibaba.druid.pool.DruidDataSource

具体代码

druid数据源配置

package com.qlt.tracing.config;

import com.alibaba.druid.pool.DruidDataSource;
import com.alibaba.druid.support.http.StatViewServlet;
import com.alibaba.druid.support.http.WebStatFilter;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.boot.web.servlet.ServletRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import javax.sql.DataSource;
import java.util.Arrays;
import java.util.HashMap;
import java.util.Map;

@Configuration
public class DruidConfiguration {

    //数据源1
    @ConfigurationProperties(prefix = "spring.datasource.self")
    @Bean
    public DataSource selfDataSource(){
        return  new DruidDataSource();
    }

    //数据源2
    @ConfigurationProperties(prefix = "spring.datasource.ueight")
    @Bean
    public DataSource ueightDataSource(){
        return  new DruidDataSource();
    }

    //数据源3
    @ConfigurationProperties(prefix = "spring.datasource.tail")
    @Bean
    public DataSource tailDataSource(){
        return  new DruidDataSource();
    }

    
    //配置Druid的监控
    //1、配置一个管理后台的Servlet
    @Bean
    public ServletRegistrationBean statViewServlet(){
        ServletRegistrationBean bean = new ServletRegistrationBean(new StatViewServlet(), "/druid/*");
        Map<String,String> initParams = new HashMap<>();
        initParams.put("loginUsername","admin");
        initParams.put("loginPassword","123456");
        initParams.put("allow","");//默认就是允许所有访问
        initParams.put("deny","192.168.15.21");
        bean.setInitParameters(initParams);
        return bean;
    }
    //2、配置一个web监控的filter
    @Bean
    public FilterRegistrationBean webStatFilter(){
        FilterRegistrationBean bean = new FilterRegistrationBean();
        bean.setFilter(new WebStatFilter());
        Map<String,String> initParams = new HashMap<>();
        initParams.put("exclusions","*.js,*.css,/druid/*");
        bean.setInitParameters(initParams);
        bean.setUrlPatterns(Arrays.asList("/*"));
        return  bean;
    }
}

绑定数据源1：

package com.qlt.tracing.config;


import com.alibaba.druid.pool.DruidDataSource;
import org.apache.ibatis.session.SqlSessionFactory;
import org.mybatis.spring.SqlSessionFactoryBean;
import org.mybatis.spring.SqlSessionTemplate;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.beans.factory.annotation.Autowired;
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 org.springframework.context.annotation.Primary;
import org.springframework.jdbc.datasource.DataSourceTransactionManager;

import javax.sql.DataSource;


@Configuration
@MapperScan(basePackages = "com.qlt.tracing.self.mapper", sqlSessionTemplateRef = "selfSqlSessionTemplate")
public class SelfDataSourceConfig {

    @Bean
    @Primary
    public SqlSessionFactory selfSqlSessionFactory(@Qualifier("selfDataSource") DataSource dataSource) throws Exception {
        SqlSessionFactoryBean bean = new SqlSessionFactoryBean();
        bean.setDataSource(dataSource);
        // bean.setMapperLocations(new PathMatchingResourcePatternResolver().getResources("classpath*:templates/test/*.xml"));
        return bean.getObject();
    }

    @Bean
    @Primary
    public DataSourceTransactionManager selfTransactionManager(@Qualifier("selfDataSource") DataSource dataSource) {
        return new DataSourceTransactionManager(dataSource);
    }

    @Bean
    @Primary
    public SqlSessionTemplate selfSqlSessionTemplate(@Qualifier("selfSqlSessionFactory") SqlSessionFactory sqlSessionFactory) throws Exception {
        return new SqlSessionTemplate(sqlSessionFactory);
    }

}

绑定数据源2：

package com.qlt.tracing.config;


import org.apache.ibatis.session.SqlSessionFactory;
import org.mybatis.spring.SqlSessionFactoryBean;
import org.mybatis.spring.SqlSessionTemplate;
import org.mybatis.spring.annotation.MapperScan;
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.jdbc.datasource.DataSourceTransactionManager;

import javax.sql.DataSource;


@Configuration
@MapperScan(basePackages = "com.qlt.tracing.ueight.mapper", sqlSessionTemplateRef = "ueightSqlSessionTemplate")
public class UEightDataSourceConfig {

    @Bean
    @Primary
    public SqlSessionFactory ueightSqlSessionFactory(@Qualifier("ueightDataSource") DataSource dataSource) throws Exception {
        SqlSessionFactoryBean bean = new SqlSessionFactoryBean();
        bean.setDataSource(dataSource);
        // bean.setMapperLocations(new PathMatchingResourcePatternResolver().getResources("classpath*:templates/test/*.xml"));
        return bean.getObject();
    }

    @Bean
    @Primary
    public DataSourceTransactionManager ueightTransactionManager(@Qualifier("ueightDataSource") DataSource dataSource) {
        return new DataSourceTransactionManager(dataSource);
    }

    @Bean
    @Primary
    public SqlSessionTemplate ueightSqlSessionTemplate(@Qualifier("ueightSqlSessionFactory") SqlSessionFactory sqlSessionFactory) throws Exception {
        return new SqlSessionTemplate(sqlSessionFactory);
    }

}

绑定数据源3：

package com.qlt.tracing.config;


import org.apache.ibatis.session.SqlSessionFactory;
import org.mybatis.spring.SqlSessionFactoryBean;
import org.mybatis.spring.SqlSessionTemplate;
import org.mybatis.spring.annotation.MapperScan;
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.jdbc.datasource.DataSourceTransactionManager;

import javax.sql.DataSource;


@Configuration
@MapperScan(basePackages = "com.qlt.tracing.tail.mapper", sqlSessionTemplateRef = "tailSqlSessionTemplate")
public class TailDataSourceConfig {

    @Bean
    public SqlSessionFactory tailSqlSessionFactory(@Qualifier("tailDataSource") DataSource dataSource) throws Exception {
        SqlSessionFactoryBean bean = new SqlSessionFactoryBean();
        bean.setDataSource(dataSource);
        // bean.setMapperLocations(new PathMatchingResourcePatternResolver().getResources("classpath*:templates/test/*.xml"));
        return bean.getObject();
    }

    @Bean
    public DataSourceTransactionManager utailTransactionManager(@Qualifier("tailDataSource") DataSource dataSource) {
        return new DataSourceTransactionManager(dataSource);
    }

    @Bean
    public SqlSessionTemplate tailSqlSessionTemplate(@Qualifier("tailSqlSessionFactory") SqlSessionFactory sqlSessionFactory) throws Exception {
        return new SqlSessionTemplate(sqlSessionFactory);
    }

}

总结 ：

self 包下面的mapper 使用数据源1 

ueight 包下面的mapper 使用数据源2

tail 包下面的mapper 使用数据源3

源码地址：

码云 https://gitee.com/newuu/multidatasource.git

github https://github.com/preScope/multidatasource.git