springboot中如何利用mybatis+druid配置动态数据源

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一、建数据库和表
1.数据库demo1放一张user表

SET FOREIGN_KEY_CHECKS=0;-- ------------------------------ Table structure for user-- ----------------------------DROP TABLE IF EXISTS `user`;CREATE TABLE `user` (`id` int(11) NOT NULL,`name` varchar(255) DEFAULT NULL,PRIMARY KEY (`id`)) ENGINE=InnoDB DEFAULT CHARSET=utf8;-- ------------------------------ Records of user-- ----------------------------INSERT INTO `user` VALUES ('1', 'aa');INSERT INTO `user` VALUES ('2', 'bb');

2.数据库demo2放一张role表

SET FOREIGN_KEY_CHECKS=0;-- ------------------------------ Table structure for role-- ----------------------------DROP TABLE IF EXISTS `role`;CREATE TABLE `role` (`id` int(11) NOT NULL,`name` varchar(255) DEFAULT NULL,PRIMARY KEY (`id`)) ENGINE=InnoDB DEFAULT CHARSET=utf8;-- ------------------------------ Records of role-- ----------------------------INSERT INTO `role` VALUES ('1', 'CC');INSERT INTO `role` VALUES ('2', 'DD');

二、pom.xml引入包

org.springframework.bootspring-boot-starter-weborg.springframework.bootspring-boot-starter-testtestorg.springframework.bootspring-boot-starter-thymeleafmysqlmysql-connector-javaruntimemysqlmysql-connector-javaorg.springframework.bootspring-boot-starter-jdbcorg.mybatis.spring.bootmybatis-spring-boot-starter2.0.1org.aspectjaspectjweavercom.alibabadruid-spring-boot-starter1.1.10com.typesafe.dynamicdatasourcedynamic-data-source_2.11

三、用generator插件生成user、role两张表的实体类、mapper.java、mapper.xml

User.javaRole.javaUserMapper.javaRoleMapper.javaUserMapper.xmlRoleMapper.xml

四、配置application.yml

server:port: 8088mybatis:mapper-locations: classpath:mapper/*.xmlspring:datasource:db1:url: jdbc:mysql://localhost:3306/demo1?useUnicode=true&characterEncoding=utf8&serverTimezone=GMTusername: rootpassword: roottype: com.alibaba.druid.pool.DruidDataSource#驱动包driver-class-name: com.mysql.cj.jdbc.Driver#初始连接数initial-size: 5#最小空闲数min-idle: 5#最大活动数max-active: 20#等待超时时间max-wait: 60000#配置间隔多久才进行一次检测，检测需要关闭的空闲连接，单位是毫秒time-between-eviction-runs-millis: 60000# 配置一个连接在池中最小生存的时间，单位是毫秒min-evictable-idle-time-millis: 300000#验证数据库连接的查询语句,MYSQL是select 1validation-query: SELECT 1 FROM DUAL#空闲时测试，testOnBorrow和testOnReturn在生产环境一般是不开启的，主要是性能考虑。失效连接主要通过testWhileIdle保证test-while-idle: truetest-on-borrow: falsetest-on-return: false#打开PSCache，并指定每个链接上的PSCache大小pool-prepared-statements: truemax-pool-prepared-statement-per-connection-size: 20#配置监控统计拦截的filters,去掉后监控界面sql无法统计，'wall'用于防火墙，此处是filter修改的地方filters: stat,wall#通过connectproperties属性来打开mergesql功能：慢sql记录connection-properties: druid.stat.mergeSql=true;druid.stat.slowSqlMillis=5000#合并多个DruidDataSourceuseGlobalDataSourceStat: truedb2:url: jdbc:mysql://localhost:3306/demo2?useUnicode=true&characterEncoding=utf8&serverTimezone=GMTusername: rootpassword: roottype: com.alibaba.druid.pool.DruidDataSource#驱动包driver-class-name: com.mysql.cj.jdbc.Driver#初始连接数initial-size: 5#最小空闲数min-idle: 5#最大活动数max-active: 20#等待超时时间max-wait: 60000#配置间隔多久才进行一次检测，检测需要关闭的空闲连接，单位是毫秒time-between-eviction-runs-millis: 60000# 配置一个连接在池中最小生存的时间，单位是毫秒min-evictable-idle-time-millis: 300000#验证数据库连接的查询语句,MYSQL是select 1validation-query: SELECT 1 FROM DUAL#空闲时测试，testOnBorrow和testOnReturn在生产环境一般是不开启的，主要是性能考虑。失效连接主要通过testWhileIdle保证test-while-idle: truetest-on-borrow: falsetest-on-return: false#打开PSCache，并指定每个链接上的PSCache大小pool-prepared-statements: truemax-pool-prepared-statement-per-connection-size: 20#配置监控统计拦截的filters,去掉后监控界面sql无法统计，'wall'用于防火墙，此处是filter修改的地方filters: stat,wall#通过connectproperties属性来打开mergesql功能：慢sql记录connection-properties: druid.stat.mergeSql=true;druid.stat.slowSqlMillis=5000#合并多个DruidDataSourceuseGlobalDataSourceStat: true

五、启动类扫描mapper.java文件

@SpringBootApplication@MapperScan("com.example.demo.dao")public class DemoApplication {public static void main(String[] args) {SpringApplication.run(DemoApplication.class, args);}}

六、定义DataSourceConfig， 将application.yml中的配置导入DataSource中，并注入到bean

@Configurationpublic class DataSourceConfig {//从配置文件配置数据源@Primary@Bean(name="datasource1")@ConfigurationProperties("spring.datasource.db1")public DataSource dataSource1(){return new DruidDataSource();}//从配置文件配置数据源@Bean(name="datasource2")@ConfigurationProperties("spring.datasource.db2")public DataSource dataSource2(){return new DruidDataSource();}//动态数据源 进行数据源切换@Bean(name="dynamicDataSource")public DataSource dynamicDataSource(){DynamicDataSource dynamicDatasource=new DynamicDataSource();//设置默认数据源dynamicDatasource.setDefaultTargetDataSource(dataSource1());//配置多数据源Map dsMap=new HashMap<>();dsMap.put("datasource1",dataSource1());dsMap.put("datasource2",dataSource2());//将多数据源放到数据源池中dynamicDatasource.setTargetDataSources(dsMap);return dynamicDatasource;}}

七、定义动态数据源切换类DynamicDataSourceContextHolder

public class DynamicDataSourceContextHolder {private static final ThreadLocal contextHolder=new ThreadLocal<>();//设置数据源名称public static void setDB(String dbType){contextHolder.set(dbType);}//获取数据源名称public static String getDB(){return contextHolder.get();}//清除数据源名public static void clearDB(){contextHolder.remove();}}

八、定义获取动态数据源类DynamicDataSource

public class DynamicDataSource extends AbstractRoutingDataSource {@Overrideprotected Object determineCurrentLookupKey() {return DynamicDataSourceContextHolder.getDB();}}

九、定义mybatis配置类，将DynamicDataSource放入SqlSessionFactoryBean中

@EnableTransactionManagement@Configurationpublic class MyBatisConfig {@Resource(name = "dynamicDataSource")private DataSource dynamicDataSource;@Beanpublic SqlSessionFactory sqlSessionFactory() throws Exception {SqlSessionFactoryBean sqlSessionFactoryBean = new SqlSessionFactoryBean();sqlSessionFactoryBean.setDataSource(dynamicDataSource);//将动态数据源bean配置到sqlsessionfactorysqlSessionFactoryBean.setMapperLocations(new PathMatchingResourcePatternResolver().getResources("classpath:mapper/*.xml"));return sqlSessionFactoryBean.getObject();}@Beanpublic PlatformTransactionManager platformTransactionManager() {return new DataSourceTransactionManager(dynamicDataSource);}}

十、定义用于切换数据源的注解TargetDataSource

@Target({ElementType.METHOD,ElementType.TYPE})@Retention(RetentionPolicy.RUNTIME)@Documentedpublic @interface TargetDataSource {String value() default "datasource1";}

十一、定义切面DynamicDataSourceAspect，用于拦截注解，并执行数据源切换功能

@Aspect@Componentpublic class DynamicDataSourceAspect {@Before("@annotation(targetDataSource)")public void beforeSwitchDS(JoinPoint point,TargetDataSource targetDataSource){DynamicDataSourceContextHolder.setDB(targetDataSource.value());}@After("@annotation(targetDataSource)")public void afterSwitchDS(JoinPoint point,TargetDataSource targetDataSource){DynamicDataSourceContextHolder.clearDB();}}

十二、测试类Test

@RestControllerpublic class Test {@Autowiredprivate RoleMapper roleMapper;@Autowiredprivate UserMapper userMapper;//未使用TargetDataSource注解，则使用默认数据源，即datasource1@RequestMapping("/ds1")public String selectDataSource1(){return userMapper.selectByPrimaryKey(1).toString();}//使用了注解，则数据源为注解中指定的datasource2@RequestMapping("/ds2")@TargetDataSource("datasource2")public String selectDataSource2(){return roleMapper.selectByPrimaryKey(1).toString();}}

测试

1.输入

http://localhost:8088/ds1

返回
↓

2.输入

http://localhost:8088/ds2

返回
↓

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