SpringBoot2+Mybatis两个数据源实现（二）

今天药忘吃喽~ 2023-10-18 19:21 37阅读 0赞

> 之前转过一篇[《SpringBoot2+Mybatis多个数据源实现》][SpringBoot2_Mybatis]，今天补充一个其他的解决方案（原理差不多），这里是使用mysql+sqlserver作为数据源，可以供大家参考一下。

###### 一、依赖引入 ######

首先引入必要的jar包，有省略，自行补充  
`pom.xml`

<dependency>
        <groupId>com.zaxxer</groupId>
        <artifactId>HikariCP</artifactId>
        <version>3.2.0</version>
    </dependency>
    
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <version>5.1.31</version>
    </dependency>
    
    <dependency>
        <groupId>com.microsoft.sqlserver</groupId>
        <artifactId>sqljdbc4</artifactId>
        <version>4.0</version>
    </dependency>
    
    <dependency>
        <groupId>org.mybatis.spring.boot</groupId>
        <artifactId>mybatis-spring-boot-starter</artifactId>
        <version>2.0.0</version>
    </dependency>

###### 二、代码实现 ######

先创建 `DatabaseType`，定义两个数据源的名称

public enum DatabaseType {
        
        mysqlDataSource,sqlServerDataSource
    }

实现`DatabaseContextHolder`

public class DatabaseContextHolder {
        
        private static final ThreadLocal<DatabaseType> contextHolder = new ThreadLocal<>();
    
        public static void setDatabaseType(DatabaseType type) {
        
            contextHolder.set(type);
        }
    
        public static DatabaseType getDatabaseType() {
        
            return contextHolder.get();
        }
    }

实现`DynamicDataSource`

import org.springframework.jdbc.datasource.lookup.AbstractRoutingDataSource;
    
    public class DynamicDataSource extends AbstractRoutingDataSource {
        
        @Override
        protected Object determineCurrentLookupKey() {
        
            return DatabaseContextHolder.getDatabaseType();
        }
    }

实现`MyBatisConfig`

import org.apache.ibatis.session.SqlSessionFactory;
    import org.mybatis.spring.SqlSessionFactoryBean;
    import org.mybatis.spring.annotation.MapperScan;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.beans.factory.annotation.Qualifier;
    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.core.env.Environment;
    import org.springframework.core.io.support.PathMatchingResourcePatternResolver;
    import org.springframework.jdbc.datasource.DataSourceTransactionManager;
    
    import javax.sql.DataSource;
    import java.util.HashMap;
    import java.util.Map;
    
    @Configuration // 该注解类似于spring配置文件
    @MapperScan(basePackages = "com.xxx.dao")
    public class MyBatisConfig {
        
        @Autowired
        private Environment env;
    
        // 读取主数据源
        @Bean
        public DataSource mysqlDataSource(Environment env) {
        
            Map<String, Object> dsMap = new HashMap<>();
            dsMap.put("type", env.getProperty("spring.datasource.type"));
            dsMap.put("driver", env.getProperty("spring.datasource.driver-class-name"));
            dsMap.put("url", env.getProperty("spring.datasource.url"));
            dsMap.put("username", env.getProperty("spring.datasource.username"));
            dsMap.put("password", env.getProperty("spring.datasource.password"));
            return buildDataSource(dsMap);
        }
    
        // 读取从数据源
        @Bean
        public DataSource sqlServerDataSource(Environment env) {
        
            Map<String, Object> dsMap = new HashMap<>();
            dsMap.put("type", env.getProperty("slave.datasource.type"));
            dsMap.put("driver", env.getProperty("slave.datasource.driver-class-name"));
            dsMap.put("url", env.getProperty("slave.datasource.url"));
            dsMap.put("username", env.getProperty("slave.datasource.username"));
            dsMap.put("password", env.getProperty("slave.datasource.password"));
            return buildDataSource(dsMap);
        }
    
        /**
         * @Primary 该注解表示在同一个接口有多个实现类可以注入的时候，默认选择哪一个，而不是让@autowire注解报错
         * @Qualifier 根据名称进行注入，通常是在具有相同的多个类型的实例的一个注入（例如有多个DataSource类型的实例）
         */
        @Bean
        @Primary
        public DynamicDataSource dataSource(@Qualifier("mysqlDataSource") DataSource mysqlDataSource,
                                            @Qualifier("sqlServerDataSource") DataSource sqlServerDataSource) {
        
            Map<Object, Object> targetDataSources = new HashMap<>();
            targetDataSources.put(DatabaseType.mysqlDataSource, mysqlDataSource);
            targetDataSources.put(DatabaseType.sqlServerDataSource, sqlServerDataSource);
    
            DynamicDataSource dataSource = new DynamicDataSource();
            dataSource.setTargetDataSources(targetDataSources);// 该方法是AbstractRoutingDataSource的方法
            dataSource.setDefaultTargetDataSource(mysqlDataSource);// 默认的datasource设
    
            return dataSource;
        }
    
        /**
         * 根据数据源创建SqlSessionFactory
         */
        @Bean
        public SqlSessionFactory sqlSessionFactory(DynamicDataSource ds) throws Exception {
        
            SqlSessionFactoryBean fb = new SqlSessionFactoryBean();
            fb.setDataSource(ds);// 指定数据源(这个必须有，否则报错)
            // 下边两句仅仅用于*.xml文件，如果整个持久层操作不需要使用到xml文件的话（只用注解就可以搞定），则不加
            //fb.setTypeAliasesPackage(env.getProperty("mybatis.typeAliasesPackage"));// 指定基包
            fb.setConfigLocation(new PathMatchingResourcePatternResolver().getResource(env.getProperty("mybatis.config-location")));
            fb.setMapperLocations(new PathMatchingResourcePatternResolver().getResources(env.getProperty("mybatis.mapper-locations")));
    
            return fb.getObject();
        }
    
        /**
         * 配置事务管理器
         */
        @Bean
        public DataSourceTransactionManager transactionManager(DynamicDataSource dataSource) throws Exception {
        
            return new DataSourceTransactionManager(dataSource);
        }
    
        /**
         * 创建DataSource
         * @param dataSourceMap
         * @return
         */
        public DataSource buildDataSource(Map<String, Object> dataSourceMap) {
        
            try {
        
                Object type = dataSourceMap.get("type");
                Class<? extends DataSource> dataSourceType = (Class<? extends DataSource>) Class.forName((String) type);
                String driverClassName = dataSourceMap.get("driver").toString();
                String url = dataSourceMap.get("url").toString();
                String username = dataSourceMap.get("username").toString();
                String password = dataSourceMap.get("password").toString();
                // 自定义DataSource配置
                DataSourceBuilder factory = DataSourceBuilder.create().driverClassName(driverClassName).url(url)
                        .username(username).password(password).type(dataSourceType);
                return factory.build();
            } catch (ClassNotFoundException e) {
        
                e.printStackTrace();
            }
            return null;
        }
    }

###### 三、yml文件配置 ######

`application.yml`

server:
      tomcat:
        uri-encoding: UTF-8
        max-threads: 1000
        min-spare-threads: 30
      port: 8888
      
    spring:
      profiles:
        active: dev
            
    #mybatis
    mybatis:
      mapper-locations: classpath:mybatis/mappers/*.xml
      config-location: classpath:mybatis/mybatis-config.xml

定义`application-dev.yml`

#mysql
    spring:
      datasource:
        driver-class-name: com.mysql.jdbc.Driver
        url: jdbc:mysql://127.0.0.1:33306/test1?useAffectedRows=true&characterEncoding=utf8
        username: root
        password: root
        type: com.zaxxer.hikari.HikariDataSource
        hikari:
          connection-timeout: 30000
          idle-timeout: 600000
          max-lifetime: 1800000
          maximum-pool-size: 10
    
    #sqlserver
    slave:
      datasource:
        driver-class-name: com.microsoft.sqlserver.jdbc.SQLServerDriver
        url: jdbc:sqlserver://127.0.0.1:1433;DatabaseName=test2;
        username: sa
        password: 123456
        type: com.zaxxer.hikari.HikariDataSource
        hikari:
          connection-timeout: 30000
          idle-timeout: 600000
          max-lifetime: 1800000
          maximum-pool-size: 10

###### 四、使用方式 ######

建议在service实现类里面使用

public List<Demo> queryList(){
        
    	//切换数据源
    	DatabaseContextHolder.setDatabaseType(DatabaseType.sqlServerDataSource);
    	Map<String,Object> map = new HashMap<>();
    	return demoDao.queryList(map);
    }
    
    public List<Demo> selectList(){
        
    	//切换数据源
    	DatabaseContextHolder.setDatabaseType(DatabaseType.mysqlDataSource);
       	Map<String,Object> map = new HashMap<>();
       	return demoDao.queryList(map);
    }

--------------------

20190709更新  
之前`hikari`的配置未生效

hikari:
       connection-timeout: 30000
       idle-timeout: 600000
       max-lifetime: 1800000
       maximum-pool-size: 10

今天优化了一下`MyBatisConfig`，增加了配置`Hikari dataSource`的超时设置，详细看代码

package com.xxx.config;
    
    import com.zaxxer.hikari.HikariConfig;
    import com.zaxxer.hikari.HikariDataSource;
    import org.apache.ibatis.session.SqlSessionFactory;
    import org.mybatis.spring.SqlSessionFactoryBean;
    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 org.springframework.core.io.support.PathMatchingResourcePatternResolver;
    import org.springframework.jdbc.datasource.DataSourceTransactionManager;
    
    import javax.sql.DataSource;
    import java.util.HashMap;
    import java.util.Map;
    
    @Configuration // 该注解类似于spring配置文件
    @MapperScan(basePackages = "com.xxx.dao")
    public class MyBatisConfig {
        
        @Autowired
        private Environment env;
    
        // 读取主数据源
        @Bean
        public DataSource mysqlDataSource(Environment env) {
        
            HikariConfig config = new HikariConfig();
            config.setDriverClassName(env.getProperty("spring.datasource.driver-class-name"));
            config.setJdbcUrl(env.getProperty("spring.datasource.url"));
            config.setUsername(env.getProperty("spring.datasource.username"));
            config.setPassword(env.getProperty("spring.datasource.password"));
            config.setConnectionTestQuery(env.getProperty("spring.datasource.ConnectionTestQuery"));
    
            config.setMaximumPoolSize(Integer.parseInt(env.getProperty("spring.datasource.hikari.maximum-pool-size")));
            config.setIdleTimeout(Integer.parseInt(env.getProperty("spring.datasource.hikari.idle-timeout")));
            config.setMaxLifetime(Integer.parseInt(env.getProperty("spring.datasource.hikari.max-lifetime")));
            config.setConnectionTimeout(Integer.parseInt(env.getProperty("spring.datasource.hikari.connection-timeout")));
    
            DataSource dataSource = new HikariDataSource(config);
            return dataSource;
        }
    
        // 读取从数据源
        @Bean
        public DataSource sqlServerDataSource(Environment env) {
        
            HikariConfig config = new HikariConfig();
            config.setDriverClassName(env.getProperty("slave.datasource.driver-class-name"));
            config.setJdbcUrl(env.getProperty("slave.datasource.url"));
            config.setUsername(env.getProperty("slave.datasource.username"));
            config.setPassword(env.getProperty("slave.datasource.password"));
            config.setConnectionTestQuery(env.getProperty("slave.datasource.ConnectionTestQuery"));
    
            config.setMaximumPoolSize(Integer.parseInt(env.getProperty("slave.datasource.hikari.maximum-pool-size")));
            config.setIdleTimeout(Integer.parseInt(env.getProperty("slave.datasource.hikari.idle-timeout")));
            config.setMaxLifetime(Integer.parseInt(env.getProperty("slave.datasource.hikari.max-lifetime")));
            config.setConnectionTimeout(Integer.parseInt(env.getProperty("slave.datasource.hikari.connection-timeout")));
    
            DataSource dataSource = new HikariDataSource(config);
            return dataSource;
        }
    
        /**
         * @Primary 该注解表示在同一个接口有多个实现类可以注入的时候，默认选择哪一个，而不是让@autowire注解报错
         * @Qualifier 根据名称进行注入，通常是在具有相同的多个类型的实例的一个注入（例如有多个DataSource类型的实例）
         */
        @Bean
        @Primary
        public DynamicDataSource dataSource(@Qualifier("mysqlDataSource") DataSource mysqlDataSource,
                                            @Qualifier("sqlServerDataSource") DataSource sqlServerDataSource) {
        
            Map<Object, Object> targetDataSources = new HashMap<>();
            targetDataSources.put(DatabaseType.mysqlDataSource, mysqlDataSource);
            targetDataSources.put(DatabaseType.sqlServerDataSource, sqlServerDataSource);
    
            DynamicDataSource dataSource = new DynamicDataSource();
            dataSource.setTargetDataSources(targetDataSources);// 该方法是AbstractRoutingDataSource的方法
            dataSource.setDefaultTargetDataSource(mysqlDataSource);// 默认的datasource设
            return dataSource;
        }
    
        /**
         * 根据数据源创建SqlSessionFactory
         */
        @Bean
        public SqlSessionFactory sqlSessionFactory(DynamicDataSource ds) throws Exception {
        
            SqlSessionFactoryBean fb = new SqlSessionFactoryBean();
            fb.setDataSource(ds);// 指定数据源(这个必须有，否则报错)
            // 下边两句仅仅用于*.xml文件，如果整个持久层操作不需要使用到xml文件的话（只用注解就可以搞定），则不加
            //fb.setTypeAliasesPackage(env.getProperty("mybatis.typeAliasesPackage"));// 指定基包
            fb.setConfigLocation(new PathMatchingResourcePatternResolver().getResource(env.getProperty("mybatis.config-location")));
            fb.setMapperLocations(new PathMatchingResourcePatternResolver().getResources(env.getProperty("mybatis.mapper-locations")));//
    
            return fb.getObject();
        }
    
        /**
         * 配置事务管理器
         */
        @Bean
        public DataSourceTransactionManager transactionManager(DynamicDataSource dataSource) throws Exception {
        
            return new DataSourceTransactionManager(dataSource);
        }
    }

[SpringBoot2_Mybatis]: https://blog.csdn.net/tiantang_1986/article/details/88989382