SpringBoot+Mybatis plus实现多数据源整合的实践

springboot 版本为1.5.10.release，mybatis plus 版本为2.1.8。

第一步：填写配置信息：

spring:
  aop:
    proxy-target-class: true
    auto: true
  datasource:
    druid:
      # 数据库 1
      db1:
        url: jdbc:mysql://localhost:3306/db1?useunicode=true&characterencoding=utf8&autoreconnect=true&zerodatetimebehavior=converttonull&transformedbitisboolean=true
        username: root
        password: root
        driver-class-name: com.mysql.jdbc.driver
        initialsize: 5
        minidle: 5
        maxactive: 20
      # 数据库 2
      db2:
        url: jdbc:mysql://localhost:3306/db2?useunicode=true&characterencoding=utf8&autoreconnect=true&zerodatetimebehavior=converttonull&transformedbitisboolean=true
        username: root
        password: root
        driver-class-name: com.mysql.jdbc.driver
        initialsize: 5
        minidle: 5
        maxactive: 20

第二步： 数据源配置：

@configuration
@mapperscan({"com.warm.system.mapper*"})
public class mybatisplusconfig {

    /**
     * mybatis-plus分页插件<br>
     * 文档：http://mp.baomidou.com<br>
     */
    @bean
    public paginationinterceptor paginationinterceptor() {
        paginationinterceptor paginationinterceptor = new paginationinterceptor();
        //paginationinterceptor.setlocalpage(true);// 开启 pagehelper 的支持
        return paginationinterceptor;
    }

    /**
     * mybatis-plus sql执行效率插件【生产环境可以关闭】
     */
    @bean
    public performanceinterceptor performanceinterceptor() {
        return new performanceinterceptor();
    }

    @bean(name = "db1")
    @configurationproperties(prefix = "spring.datasource.druid.db1" )
    public datasource db1 () {
        return druiddatasourcebuilder.create().build();
    }

    @bean(name = "db2")
    @configurationproperties(prefix = "spring.datasource.druid.db2" )
    public datasource db2 () {
        return druiddatasourcebuilder.create().build();
    }
    /**
     * 动态数据源配置
     * @return
     */
    @bean
    @primary
    public datasource multipledatasource (@qualifier("db1") datasource db1,
                                          @qualifier("db2") datasource db2 ) {
        dynamicdatasource dynamicdatasource = new dynamicdatasource();
        map< object, object > targetdatasources = new hashmap<>();
        targetdatasources.put(dbtypeenum.db1.getvalue(), db1 );
        targetdatasources.put(dbtypeenum.db2.getvalue(), db2);
        dynamicdatasource.settargetdatasources(targetdatasources);
        dynamicdatasource.setdefaulttargetdatasource(db1);
        return dynamicdatasource;
    }

    @bean("sqlsessionfactory")
    public sqlsessionfactory sqlsessionfactory() throws exception {
        mybatissqlsessionfactorybean sqlsessionfactory = new mybatissqlsessionfactorybean();
        sqlsessionfactory.setdatasource(multipledatasource(db1(),db2()));
        //sqlsessionfactory.setmapperlocations(new pathmatchingresourcepatternresolver().getresources("classpath:/mapper/*/*mapper.xml"));

        mybatisconfiguration configuration = new mybatisconfiguration();
        //configuration.setdefaultscriptinglanguage(mybatisxmllanguagedriver.class);
        configuration.setjdbctypefornull(jdbctype.null);
        configuration.setmapunderscoretocamelcase(true);
        configuration.setcacheenabled(false);
        sqlsessionfactory.setconfiguration(configuration);
        sqlsessionfactory.setplugins(new interceptor[]{ //performanceinterceptor(),optimisticlockerinterceptor()
                paginationinterceptor() //添加分页功能
        });
        sqlsessionfactory.setglobalconfig(globalconfiguration());
        return sqlsessionfactory.getobject();
    }

    @bean
    public globalconfiguration globalconfiguration() {
        globalconfiguration conf = new globalconfiguration(new logicsqlinjector());
        conf.setlogicdeletevalue("-1");
        conf.setlogicnotdeletevalue("1");
        conf.setidtype(0);
        conf.setmetaobjecthandler(new mymetaobjecthandler());
        conf.setdbcolumnunderline(true);
        conf.setrefresh(true);
        return conf;
    }
}

第三步：利用aop进行数据源的动态切换：

@component
@aspect
@order(-100) //这是为了保证aop在事务注解之前生效,order的值越小,优先级越高
@slf4j
public class datasourceswitchaspect {

    @pointcut("execution(* com.warm.system.service.db1..*.*(..))")
    private void db1aspect() {
    }

    @pointcut("execution(* com.warm.system.service.db2..*.*(..))")
    private void db2aspect() {
    }

    @before( "db1aspect()" )
    public void db1() {
        log.info("切换到db1 数据源...");
        dbcontextholder.setdbtype(dbtypeenum.db1);
    }

    @before("db2aspect()" )
    public void db2 () {
        log.info("切换到db2 数据源...");
        dbcontextholder.setdbtype(dbtypeenum.db2);
    }
}

public class dbcontextholder {
    private static final threadlocal contextholder = new threadlocal<>();
    /**
     * 设置数据源
     * @param dbtypeenum
     */
    public static void setdbtype(dbtypeenum dbtypeenum) {
        contextholder.set(dbtypeenum.getvalue());
    }

    /**
     * 取得当前数据源
     * @return
     */
    public static string getdbtype() {
        return (string) contextholder.get();
    }

    /**
     * 清除上下文数据
     */
    public static void cleardbtype() {
        contextholder.remove();
    }
}

public enum dbtypeenum {
    db1("db1"), db2("db2");
    private string value;

    dbtypeenum(string value) {
        this.value = value;
    }

    public string getvalue() {
        return value;
    }
}

public class dynamicdatasource extends abstractroutingdatasource {
    /**
     * 取得当前使用哪个数据源
     * @return
     */
    @override
    protected object determinecurrentlookupkey() {
        return dbcontextholder.getdbtype();
    }
}

ok！写个单元测试来验证一下：

@springboottest
@runwith(springjunit4classrunner.class)
public class datatest {
    @autowired
    private userservice userservice;
    @autowired
    private orderservice orderservice;

    @test
    public void test() {
        userservice.getuserlist().stream().foreach(item -> system.out.println(item));
        orderservice.getorderlist().stream().foreach(item -> system.out.println(item));
    }
}

如图所示，证明数据源能动态切换了。

具体项目结构和代码参考github。

踩坑记录：

直接调用mybatis plus 的service方法aop不会生效，即数据源不会动态切换，解决方法：在自己的service层中封装一下，调用自定义的service方法aop即能正常生效了，如下所示：

@service
public class userserviceimpl extends serviceimpl<usermapper, user> implements userservice {

    @override
    public list<user> getuserlist() {
        return selectlist(null);
    }
}

application.yml 定义的mybatis plus 配置信息不生效，如：

#mybatis
mybatis-plus:
  mapper-locations: classpath:/mapper/*/*mapper.xml
  #实体扫描，多个package用逗号或者分号分隔
  typealiasespackage: com.jinhuatuo.edu.sys.entity
  global-config:
    #主键类型  0:"数据库id自增", 1:"用户输入id",2:"全局唯一id (数字类型唯一id)", 3:"全局唯一id uuid";
    id-type: 0
    #字段策略 0:"忽略判断",1:"非 null 判断"),2:"非空判断"
    field-strategy: 2
    #驼峰下划线转换
    db-column-underline: true
    #刷新mapper 调试神器
    refresh-mapper: true
    #数据库大写下划线转换
    #capital-mode: true
    #序列接口实现类配置
    #key-generator: com.baomidou.springboot.xxx
    #逻辑删除配置
    #logic-delete-value: 0
    #logic-not-delete-value: 1
    #自定义填充策略接口实现
    meta-object-handler: com.jinhuatuo.edu.config.mybatis.mymetaobjecthandler
    #自定义sql注入器
    #sql-injector: com.baomidou.springboot.xxx
  configuration:
    map-underscore-to-camel-case: true
    cache-enabled: false

解决方法： 所有这些配置在mybatisplusconfig 类中用代码的方式进行配置，分页插件亦是如此，否则统计列表总数的数据会拿不到，参考代码即可。

在application.yml配置

logging:
  level: debug

控制台也不会打印mybatis 执行的sql语句，解决方法：自定义日志输出方案，如在classpath下直接引入日志配置文件如logback-spring.xml即可，同时application.yml无需再配置日志信息。

logback-spring.xml配置参考：

<?xml version="1.0" encoding="utf-8"?>
<!-- scan:配置文件如果发生改变，将会重新加载，默认值为true -->
<configuration scan="true" scanperiod="10 seconds">  
    <!-- <include resource="org/springframework/boot/logging/logback/base.xml"/> -->
    <!-- 日志文件路径 -->
    <!-- <springproperty  name="logfilepath" source="logging.path"/> -->
    <property resource="application.yml" />
    <substitutionproperty name="log_home" value="${logging.path}" />
    <substitutionproperty name="project_name" value="${spring.application.name}" />
    <!--<substitutionproperty name="cur_node" value="${info.node}" />-->

    <!-- 日志数据库路径 -->
    <!-- <springproperty  name="logdbpath" source="spring.datasource.one.url"/>
    <springproperty  name="logdbdriver" source="spring.datasource.one.driver-class-name"/>
    <springproperty  name="logdbuser" source="spring.datasource.one.username"/>
    <springproperty  name="logdbpwd" source="spring.datasource.one.password"/> -->

    <!-- 将日志文件 -->
    <appender name="file" class="ch.qos.logback.core.rolling.rollingfileappender">
        <append>true</append>
        <encoder>
            <pattern>
                [ %-5level] [%date{yyyy-mm-dd hh:mm:ss}] %logger{96} [%line] - %msg%n
            </pattern>
            <charset>utf-8</charset>
        </encoder>

        <rollingpolicy class="ch.qos.logback.core.rolling.timebasedrollingpolicy">
            <filenamepattern>${log_home}/${project_name}-%d{yyyy-mm-dd}.%i.log</filenamepattern>
            <timebasedfilenamingandtriggeringpolicy class="ch.qos.logback.core.rolling.sizeandtimebasedfnatp">
                <maxfilesize>50 mb</maxfilesize>
            </timebasedfilenamingandtriggeringpolicy>
            <!--最多保留30天log-->
            <maxhistory>30</maxhistory>
        </rollingpolicy>
    </appender>
    <!-- 将日志错误文件-->
    <appender name="file_error" class="ch.qos.logback.core.rolling.rollingfileappender">
        <append>true</append>
        <encoder>
            <pattern>
                [ %-5level] [%date{yyyy-mm-dd hh:mm:ss}] %logger{96} [%line] - %msg%n
            </pattern>
            <charset>utf-8</charset>
        </encoder>

        <rollingpolicy class="ch.qos.logback.core.rolling.timebasedrollingpolicy">
            <filenamepattern>${log_home}/${project_name}-error-%d{yyyy-mm-dd}.%i.log</filenamepattern>
            <timebasedfilenamingandtriggeringpolicy class="ch.qos.logback.core.rolling.sizeandtimebasedfnatp">
                <maxfilesize>50 mb</maxfilesize>
            </timebasedfilenamingandtriggeringpolicy>
            <!--最多保留30天log-->
            <maxhistory>30</maxhistory>
        </rollingpolicy>
        <filter class="ch.qos.logback.classic.filter.thresholdfilter">
            <level>error</level>
            <!-- <onmatch>accept</onmatch>
            <onmismatch>deny </onmismatch> -->
        </filter>
    </appender>
    <!-- 将日志写入控制台 -->
    <appender name="console" class="ch.qos.logback.core.consoleappender">
        <encoder>
            <pattern>
                [ %-5level] [%date{yyyy-mm-dd hh:mm:ss}] %logger{96} [%line] - %msg%n
            </pattern>
            <!--<charset>utf-8</charset>-->
        </encoder>
    </appender>
    <!-- 将日志写入数据库 -->
    <!-- <appender name="db-classic-mysql-pool" class="ch.qos.logback.classic.db.dbappender">  
        <connectionsource class="ch.qos.logback.core.db.datasourceconnectionsource">  
            <datasource class="org.springframework.jdbc.datasource.drivermanagerdatasource">  
                <driverclassname>${logdbdriver}</driverclassname>  
                <url>${logdbpath}</url>  
                <username>${logdbuser}</username>  
                <password>${logdbpwd}</password>  
            </datasource>  
        </connectionsource>  
    </appender>  -->
    <!-- spring扩展，分环境配置log信息 -->
    <springprofile name="dev">

        <!-- <logger name="sand.dao" level="debug"/> -->
        <!-- <logger name="org.springframework.web" level="info"/> -->
        <logger name="org.springboot.sample" level="trace" />
        <logger name="org.springframework.cloud" level="info" />
        <logger name="com.netflix" level="info"></logger>
        <logger name="org.springframework.boot" level="info"></logger>
        <logger name="org.springframework.web" level="info"/>
        <logger name="jdbc.sqltiming" level="debug"/>
        <logger name="com.ibatis" level="debug" />
        <logger name="com.ibatis.common.jdbc.simpledatasource" level="debug" />
        <logger name="com.ibatis.common.jdbc.scriptrunner" level="debug" />
        <logger name="com.ibatis.sqlmap.engine.impl.sqlmapclientdelegate" level="debug" />
        <logger name="java.sql.connection" level="debug" />
        <logger name="java.sql.statement" level="debug" />
        <logger name="java.sql.preparedstatement" level="debug" />
        <logger name="java.sql.resultset" level="debug" />
        <logger name="com.warm" level="debug"/>
        <root level="debug">
            <appender-ref ref="console" />
            <appender-ref ref="file" />
        </root>
        <root level="error">
            <appender-ref ref="file_error" />
            <!-- <appender-ref ref="db-classic-mysql-pool" /> -->
        </root>
    </springprofile>
    <springprofile name="test">
        <logger name="org.springboot.sample" level="trace" />
        <logger name="org.springframework.cloud" level="info" />
        <logger name="com.netflix" level="info"></logger>
        <logger name="org.springframework.boot" level="info"></logger>

        <logger name="org.springframework.web" level="info"/>
        <logger name="jdbc.sqltiming" level="debug"/>
        <logger name="com.ibatis" level="debug" />
        <logger name="com.ibatis.common.jdbc.simpledatasource" level="debug" />
        <logger name="com.ibatis.common.jdbc.scriptrunner" level="debug" />
        <logger name="com.ibatis.sqlmap.engine.impl.sqlmapclientdelegate" level="debug" />
        <logger name="java.sql.connection" level="debug" />
        <logger name="java.sql.statement" level="debug" />
        <logger name="java.sql.preparedstatement" level="debug" />
        <logger name="java.sql.resultset" level="debug" />
        <logger name="com.warm" level="debug"/>
        <root level="debug">
            <!-- <appender-ref ref="console" /> -->
            <appender-ref ref="file" />
        </root>
        <root level="error">
            <appender-ref ref="file_error" />
            <!-- <appender-ref ref="db-classic-mysql-pool" /> -->
        </root>
    </springprofile>
    <springprofile name="prod">
        <logger name="org.springboot.sample" level="trace" />
        <logger name="org.springframework.cloud" level="info" />
        <logger name="com.netflix" level="info"></logger>
        <logger name="org.springframework.boot" level="info"></logger>

        <logger name="org.springframework.web" level="info"/>
        <logger name="jdbc.sqltiming" level="debug"/>
        <logger name="com.ibatis" level="debug" />
        <logger name="com.ibatis.common.jdbc.simpledatasource" level="debug" />
        <logger name="com.ibatis.common.jdbc.scriptrunner" level="debug" />
        <logger name="com.ibatis.sqlmap.engine.impl.sqlmapclientdelegate" level="debug" />
        <logger name="java.sql.connection" level="debug" />
        <logger name="java.sql.statement" level="debug" />
        <logger name="java.sql.preparedstatement" level="debug" />
        <logger name="java.sql.resultset" level="debug" />
        <logger name="com.warm" level="info"/>
        <root level="debug">
            <!-- <appender-ref ref="console" /> -->
            <appender-ref ref="file" />
        </root>
        <root level="error">
            <appender-ref ref="file_error" />
            <!-- <appender-ref ref="db-classic-mysql-pool" /> -->
        </root>
    </springprofile>
</configuration>

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