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spring boot:使mybatis訪問多個druid數據源(spring boot 2.3.2)

本文轉載自   查看原文   2020-08-15 11:15   532    spring/ spring boot/ 多數據源/ java/ druid/ mybatis/ 數據源

一，為什么要使用多個數據源?

1，什么情況下需要使用多個數據源?
當我們需要訪問不同的數據庫時，則需要配置配置多個數據源，
例如：電商的業務數據庫(包括用戶/商品/訂單等)
           和統計數據庫(按月日年的訂單數量/金額等的統計)通常是分開到不同的數據庫
所以我們需要在應用中創建多個數據庫連接池
 
2,通常的作法：
     例如我們有兩個數據庫orderdb,goodsdb
    兩個數據庫的mapper.xml文件需要放到不同的目錄下，
    通過給不同的目錄配置不同的數據源，
    從而實現處理不同的業務功能
 

說明：劉宏締的架構森林是一個專注架構的博客，地址：https://www.cnblogs.com/architectforest

         對應的源碼可以訪問這里獲取： https://github.com/liuhongdi/

說明：作者:劉宏締 郵箱: 371125307@qq.com

 

二，演示項目的相關信息

1,項目地址:

https://github.com/liuhongdi/multidruid

 

2,項目功能說明：

訪問兩個數據庫，分別打印出兩個庫中商品和訂單的信息

 

3,項目結構：如圖:

 

 

 

三，配置文件說明:

1,pom.xml

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

        <!--druid begin-->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid-spring-boot-starter</artifactId>
            <version>1.1.23</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-log4j2</artifactId>
        </dependency>
        <dependency>
            <groupId>com.lmax</groupId>
            <artifactId>disruptor</artifactId>
            <version>3.4.2</version>
        </dependency>
        <!--druid   end-->

        <!--mybatis begin-->
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>2.1.3</version>
        </dependency>
        <!--mybatis end-->

        <!--mysql begin-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>
        <!--mysql end-->

說明：因為給druid使用了log4j2日志，為避免沖突，

         在spring-boot-starter-web中排除了spring-boot-starter-logging

 

2，application.properties:

#error
server.error.include-stacktrace=always
#error
logging.level.org.springframework.web=trace

#   數據源goodsdb基本配置
spring.datasource.druid.goodsdb.username = root
spring.datasource.druid.goodsdb.password = lhddemo
spring.datasource.druid.goodsdb.driver-class-name = com.mysql.cj.jdbc.Driver
spring.datasource.druid.goodsdb.url = jdbc:mysql://127.0.0.1:3306/store?serverTimezone=UTC
spring.datasource.druid.goodsdb.type = com.alibaba.druid.pool.DruidDataSource
spring.datasource.druid.goodsdb.initialSize = 5
spring.datasource.druid.goodsdb.minIdle = 5
spring.datasource.druid.goodsdb.maxActive = 20
spring.datasource.druid.goodsdb.maxWait = 60000
spring.datasource.druid.goodsdb.timeBetweenEvictionRunsMillis = 60000
spring.datasource.druid.goodsdb.minEvictableIdleTimeMillis = 300000
spring.datasource.druid.goodsdb.validationQuery = SELECT 1 FROM DUAL
spring.datasource.druid.goodsdb.testWhileIdle = true
spring.datasource.druid.goodsdb.testOnBorrow = false
spring.datasource.druid.goodsdb.testOnReturn = false
spring.datasource.druid.goodsdb.poolPreparedStatements = true
#   數據源orderdb基本配置
spring.datasource.druid.orderdb.username = root
spring.datasource.druid.orderdb.password = lhddemo
spring.datasource.druid.orderdb.driver-class-name = com.mysql.cj.jdbc.Driver
spring.datasource.druid.orderdb.url = jdbc:mysql://127.0.0.1:3306/orderdb?serverTimezone=UTC
spring.datasource.druid.orderdb.type = com.alibaba.druid.pool.DruidDataSource
spring.datasource.druid.orderdb.initialSize = 5
spring.datasource.druid.orderdb.minIdle = 5
spring.datasource.druid.orderdb.maxActive = 20
spring.datasource.druid.orderdb.maxWait = 60000
spring.datasource.druid.orderdb.timeBetweenEvictionRunsMillis = 60000
spring.datasource.druid.orderdb.minEvictableIdleTimeMillis = 300000
spring.datasource.druid.orderdb.validationQuery = SELECT 1 FROM DUAL
spring.datasource.druid.orderdb.testWhileIdle = true
spring.datasource.druid.orderdb.testOnBorrow = false
spring.datasource.druid.orderdb.testOnReturn = false
spring.datasource.druid.orderdb.poolPreparedStatements = true

#   配置監控統計攔截的filters，去掉后監控界面sql無法統計，'wall'用於防火牆
spring.datasource.druid.filters = stat,wall,log4j2
spring.datasource.druid.maxPoolPreparedStatementPerConnectionSize = 20
spring.datasource.druid.useGlobalDataSourceStat = true
spring.datasource.druid.connectionProperties = druid.stat.mergeSql=true;druid.stat.slowSqlMillis=500

#druid sql firewall monitor
spring.datasource.druid.filter.wall.enabled=true

#druid sql monitor
spring.datasource.druid.filter.stat.enabled=true
spring.datasource.druid.filter.stat.log-slow-sql=true
spring.datasource.druid.filter.stat.slow-sql-millis=10000
spring.datasource.druid.filter.stat.merge-sql=true

#druid uri monitor
spring.datasource.druid.web-stat-filter.enabled=true
spring.datasource.druid.web-stat-filter.url-pattern=/*
spring.datasource.druid.web-stat-filter.exclusions=*.js,*.gif,*.jpg,*.bmp,*.png,*.css,*.ico,/druid/*

#druid session monitor
spring.datasource.druid.web-stat-filter.session-stat-enable=true
spring.datasource.druid.web-stat-filter.profile-enable=true

#druid spring monitor
spring.datasource.druid.aop-patterns=com.druid.*

#monintor,druid login user config
spring.datasource.druid.stat-view-servlet.enabled=true
spring.datasource.druid.stat-view-servlet.login-username=root
spring.datasource.druid.stat-view-servlet.login-password=root

#mybatis
mybatis.mapper-locations=classpath:/mapper/*Mapper.xml
mybatis.type-aliases-package=com.example.demo.mapper
mybatis.configuration.log-impl=org.apache.ibatis.logging.stdout.StdOutImpl
#log
logging.config = classpath:log4j2.xml

 

3,log4j2.xml

<?xml version="1.0" encoding="UTF-8"?>
<configuration status="OFF">
<appenders>
    <Console name="Console" target="SYSTEM_OUT">
        <!--只接受程序中DEBUG級別的日志進行處理-->
        <ThresholdFilter level="DEBUG" onMatch="ACCEPT" onMismatch="DENY"/>
        <PatternLayout pattern="%d{yyyy-MM-dd HH:mm:ss.SSS} [%thread] [%file:%line] %-5level %logger{35} - %msg %n"/>
    </Console>
    <!--處理INFO級別的日志，並把該日志放到logs/info.log文件中-->
    <RollingFile name="RollingFileInfo" fileName="./logs/info.log"
                 filePattern="logs/$${date:yyyy-MM}/info-%d{yyyy-MM-dd}-%i.log.gz">
        <Filters>
            <ThresholdFilter level="INFO"/>
            <ThresholdFilter level="WARN" onMatch="DENY" onMismatch="NEUTRAL"/>
        </Filters>
        <PatternLayout pattern="%d{yyyy-MM-dd HH:mm:ss.SSS} [%thread] [%file:%line] %-5level %logger{35} - %msg %n"/>
        <Policies>
            <SizeBasedTriggeringPolicy size="500 MB"/>
            <TimeBasedTriggeringPolicy/>
        </Policies>
    </RollingFile>
    <!--處理WARN級別的日志，並把該日志放到logs/warn.log文件中-->
    <RollingFile name="RollingFileWarn" fileName="./logs/warn.log"
                 filePattern="logs/$${date:yyyy-MM}/warn-%d{yyyy-MM-dd}-%i.log.gz">
        <Filters>
            <ThresholdFilter level="WARN"/>
            <ThresholdFilter level="ERROR" onMatch="DENY" onMismatch="NEUTRAL"/>
        </Filters>
        <PatternLayout pattern="%d{yyyy-MM-dd HH:mm:ss.SSS} [%thread] [%file:%line] %-5level %logger{35} - %msg %n"/>
        <Policies>
            <SizeBasedTriggeringPolicy size="500 MB"/>
            <TimeBasedTriggeringPolicy/>
        </Policies>
    </RollingFile>
    <!--處理error級別的日志，並把該日志放到logs/error.log文件中-->
    <RollingFile name="RollingFileError" fileName="./logs/error.log"
                 filePattern="logs/$${date:yyyy-MM}/error-%d{yyyy-MM-dd}-%i.log.gz">
        <ThresholdFilter level="ERROR"/>
        <PatternLayout pattern="%d{yyyy-MM-dd HH:mm:ss.SSS} [%thread] [%file:%line] %-5level %logger{35} - %msg %n"/>
        <Policies>
            <SizeBasedTriggeringPolicy size="500 MB"/>
            <TimeBasedTriggeringPolicy/>
        </Policies>
    </RollingFile>
    <!--druid的日志記錄追加器-->
    <RollingFile name="druidSqlRollingFile" fileName="./logs/druid-sql.log"
                 filePattern="logs/$${date:yyyy-MM}/api-%d{yyyy-MM-dd}-%i.log.gz">
        <PatternLayout pattern="%d{yyyy-MM-dd HH:mm:ss.SSS} [%thread] [%file:%line] %-5level %logger{35} - %msg %n"/>
        <Policies>
            <SizeBasedTriggeringPolicy size="500 MB"/>
            <TimeBasedTriggeringPolicy/>
        </Policies>
    </RollingFile>
</appenders>
<loggers>
    <AsyncRoot level="info">
        <appender-ref ref="Console"/>
        <appender-ref ref="RollingFileInfo"/>
        <appender-ref ref="RollingFileWarn"/>
        <appender-ref ref="RollingFileError"/>
    </AsyncRoot>
    <!--記錄druid-sql的記錄-->
    <AsyncLogger name="druid.sql.Statement" level="debug" additivity="false">
        <appender-ref ref="druidSqlRollingFile"/>
    </AsyncLogger>
</loggers>
</configuration>

 

4,數據庫的相關業務表:

goods表

CREATE TABLE `goods` (
 `goodsId` bigint(11) unsigned NOT NULL AUTO_INCREMENT COMMENT 'id',
 `goodsName` varchar(500) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci NOT NULL DEFAULT '' COMMENT 'name',
 `subject` varchar(200) NOT NULL DEFAULT '' COMMENT '標題',
 `price` decimal(15,2) NOT NULL DEFAULT '0.00' COMMENT '價格',
 `stock` int(11) NOT NULL DEFAULT '0' COMMENT 'stock',
 PRIMARY KEY (`goodsId`)
) ENGINE=InnoDB AUTO_INCREMENT=0 DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci COMMENT='商品表'

goods表中的數據:

INSERT INTO `goods` (`goodsId`, `goodsName`, `subject`, `price`, `stock`) VALUES
(3, '100分電動牙刷', '好用到讓你愛上刷牙', '59.00', 96);

order表:

CREATE TABLE `orderinfo` (
 `orderId` bigint(11) unsigned NOT NULL AUTO_INCREMENT COMMENT 'id',
 `orderSn` varchar(100) NOT NULL DEFAULT '' COMMENT '編號',
 `orderTime` timestamp NOT NULL DEFAULT '1971-01-01 00:00:01' COMMENT '下單時間',
 `orderStatus` tinyint(4) NOT NULL DEFAULT '0' COMMENT '狀態:0,未支付，1，已支付，2，已發貨，3，已退貨,4,已過期',
 `userId` int(12) NOT NULL DEFAULT '0' COMMENT '用戶id',
 `price` decimal(10,0) NOT NULL DEFAULT '0' COMMENT '價格',
 `addressId` int(12) NOT NULL DEFAULT '0' COMMENT '地址',
 PRIMARY KEY (`orderId`),
 UNIQUE KEY `orderSn` (`orderSn`)
) ENGINE=InnoDB AUTO_INCREMENT=0 DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci COMMENT='訂單表'

order表中的數據:

INSERT INTO `orderinfo` (`orderId`, `orderSn`, `orderTime`, `orderStatus`, `userId`, `price`, `addressId`) VALUES
(77, '20200814171411660', '2020-08-14 09:14:12', 0, 8, '100', 0);

 

四，java代碼說明:

1,GoodsdbSourceConfig.java

@Configuration
@MapperScan(basePackages = "com.multidruid.demo.mapper.goodsdb", sqlSessionTemplateRef = "goodsdbSqlSessionTemplate")
public class GoodsdbSourceConfig {

    @Bean
    @Primary
    @ConfigurationProperties("spring.datasource.druid.goodsdb")
    public DataSource goodsdbDataSource() {
        return DruidDataSourceBuilder.create().build();
    }

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

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

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

說明：用basePackages指定mapper程序所在目錄,

         bean.setMapperLocations指定mapper的xml文件所在目錄

 

2,OrderdbSourceConfig.java

@Configuration
@MapperScan(basePackages = "com.multidruid.demo.mapper.orderdb", sqlSessionTemplateRef = "orderdbSqlSessionTemplate")
public class OrderdbSourceConfig {

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

    @Bean
    public SqlSessionFactory orderdbSqlSessionFactory(@Qualifier("orderdbDataSource") DataSource dataSource) throws Exception {
        SqlSessionFactoryBean bean = new SqlSessionFactoryBean();
        bean.setDataSource(dataSource);
        bean.setMapperLocations(new PathMatchingResourcePatternResolver().getResources("classpath:mapper/orderdb/*.xml"));
        return bean.getObject();
    }

    @Bean
    public DataSourceTransactionManager orderdbTransactionManager(@Qualifier("orderdbDataSource") DataSource dataSource) {
        return new DataSourceTransactionManager(dataSource);
    }

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

說明：用basePackages指定mapper程序所在目錄,

         bean.setMapperLocations指定mapper的xml文件所在目錄

        主要是把兩個數據源對應的mapper接口程序和mapper的xml文件隔離開

 

3,GoodsMapper.java

@Repository
@Mapper
public interface GoodsMapper {
    Goods selectOneGoods(Long goodsId);
}

 

4,OrderMapper.java

@Repository
@Mapper
public interface OrderMapper {
    Order selectOneOrder(Long orderId);
}

 

5,GoodsMapper.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
        PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.multidruid.demo.mapper.goodsdb.GoodsMapper">
    <select id="selectOneGoods" parameterType="long" resultType="com.multidruid.demo.pojo.Goods">
        select * from goods where goodsId=#{goodsId}
    </select>
</mapper>

 

6,OrderMapper.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
        PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.multidruid.demo.mapper.orderdb.OrderMapper">
    <select id="selectOneOrder" parameterType="long" resultType="com.multidruid.demo.pojo.Order">
        select * from orderinfo where orderId=#{orderId}
    </select>
</mapper>

 

7,HomeController.java

@Controller
@RequestMapping("/home")
public class HomeController {

    @Resource
    private GoodsMapper goodsMapper;

    @Resource
    private OrderMapper orderMapper;

    //商品詳情 參數:商品id
    @GetMapping("/goodsinfo")
    @ResponseBody
    public Goods goodsInfo(@RequestParam(value="goodsid",required = true,defaultValue = "0") Long goodsId) {
        Goods goods = goodsMapper.selectOneGoods(goodsId);
        return goods;
    }

    //訂單詳情 參數:訂單id
    @GetMapping("/orderinfo")
    @ResponseBody
    public Order orderInfo(@RequestParam(value="orderid",required = true,defaultValue = "0") Long orderId) {
        Order order = orderMapper.selectOneOrder(orderId);
        return order;
    }
}

 

8，Goods/Order  兩個pojo類很簡單，不列出了，大家可以訪問github查看

五，測試效果:

1,查詢商品信息，訪問：

http://127.0.0.1:8080/home/goodsinfo?goodsid=3

返回:

{"goodsId":3,"goodsName":"100分電動牙刷","subject":"好用到讓你愛上刷牙","price":59.00,"stock":96}

 

2,查詢訂單信息，訪問:

http://127.0.0.1:8080/home/orderinfo?orderid=77

返回：

{"orderId":77,"orderSn":"20200814171411660","orderTime":"2020-08-14 17:14:12","orderStatus":0,"userId":8,"price":100}

 

3,查看druid監控頁面中連接到的數據源

 

 可以看到已連接到的兩個數據源

 

六,查看spring boot的版本

  .   ____          _            __ _ _
 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::        (v2.3.2.RELEASE)

 


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