Mybatis Plus怎么配置双数据库驱动连接数据库

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具体实现

1、在pom.xml中添加如下依赖:

    1.8    1.18.2    3.2.0    1.1.9    UTF-8    UTF-8             org.springframework.boot        spring-boot-starter-web                    mysql        mysql-connector-java        runtime                    org.postgresql        postgresql        runtime                com.baomidou        mybatis-plus-boot-starter        ${mybatis-plus.version}                com.baomidou        mybatis-plus        ${mybatis-plus.version}                org.projectlombok        lombok        ${lombok.version}                com.alibaba        druid-spring-boot-starter        ${druid.version}                org.springframework.boot        spring-boot-starter-aop    

2、在yml配置文件中添加如下配置:

server:  port: 8080 spring:  application:    name: xxxx  datasource:    druid:      # mysql数据源配置      db1:        driver-class-name: com.mysql.jdbc.Driver        url: jdbc:mysql://127.0.0.1:3306/db1?useUnicode=true&characterEncoding=UTF-8&useSSL=false        username: ${username}        password: ${password}        initial-size: 5        min-idle: 5        max-active: 50      # postgresql 数据源配置      db2:        driver-class-name: org.postgresql.Driver        url: jdbc:postgresql://127.0.0.1:5432/db2?useUnicode=true&characterEncoding=utf-8        username: ${username}        password: ${password}        initial-size: 5        min-idle: 5        max-active: 50 # mybatis-plus配置mybatis-plus:  type-aliases-package: com.dms.gateway.api.entity  mapper-locations: classpath:/mapper/*Mapper.xml  global-config:    db-config:      id-type: auto      field-strategy: not_empty      logic-delete-value: 1      logic-not-delete-value: 0  configuration:    map-underscore-to-camel-case: true    cache-enabled: false    call-setters-on-nulls: true    log-impl: org.apache.ibatis.logging.stdout.StdOutImpl

3、新建DataSourceEnum枚举类，如下：

public enum DataSourceEnum {     DB1("db1"),    DB2("db2");     private String value;     DataSourceEnum(String value){this.value=value;}     public String getValue() {        return value;    }}

4、新建DataSourceContextHolder类，如下：

public class DataSourceContextHolder {     // 默认数据源    public static final String DEFAULT_DS = DataSourceEnum.DB1.getValue();     private static final ThreadLocal contextHolder = new InheritableThreadLocal<>();     /**     *  设置数据源     * @param db     */    public static void setDataSource(String db){        contextHolder.set(db);    }     /**     * 取得当前数据源     * @return     */    public static String getDataSource(){        return contextHolder.get();    }     /**     * 清除上下文数据     */    public static void clear(){        contextHolder.remove();    }}

5、新建MultipleDataSource类，如下：

public class MultipleDataSource extends AbstractRoutingDataSource {     @Override    protected Object determineCurrentLookupKey() {        return DataSourceContextHolder.getDataSource();    }}

6、新建DataSource注解，如下：

@Target({ElementType.METHOD,ElementType.TYPE})@Retention(RetentionPolicy.RUNTIME)@Documentedpublic @interface DataSource {     DataSourceEnum value() default DataSourceEnum.DB1;}

7、新建面向类和方法级别的切面，如下：

@Component@Slf4j@Aspect@Order(-6)public class DataSourceClassAspect {      @Before("@within(dataSource)")    public void doBefore(JoinPoint point, DataSource dataSource){        log.info("切换到数据源[{}]", dataSource.value().getValue());        DataSourceContextHolder.setDataSource(dataSource.value().getValue());    }     @After("@within(dataSource)")    public void doAfter(JoinPoint point, DataSource dataSource){        log.info("回收数据源[{}]", dataSource.value().getValue());        DataSourceContextHolder.clear();    }}

@Component@Slf4j@Aspect@Order(-5)public class DataSourceMethodAspect {      @Before("@annotation(dataSource)")    public void doBefore(JoinPoint point, DataSource dataSource){        log.info("切换到数据源[{}]", dataSource.value().getValue());        DataSourceContextHolder.setDataSource(dataSource.value().getValue());    }     @After("@annotation(dataSource)")    public void doAfter(JoinPoint point, DataSource dataSource){        log.info("回收数据源[{}]", dataSource.value().getValue());        DataSourceContextHolder.clear();    }}

8、新建多数据源配置类，如下：

@Configuration@MapperScan("com.dms.gateway.api.mapper")public class MybatisPlusConfig {     /*     * 分页插件，自动识别数据库类型     * 多租户，请参考官网【插件扩展】     */    @Bean    public PaginationInterceptor paginationInterceptor() {        PaginationInterceptor paginationInterceptor = new PaginationInterceptor();        return paginationInterceptor;    }     @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) {        MultipleDataSource multipleDataSource = new MultipleDataSource();        Map< Object, Object > targetDataSources = new HashMap<>();        targetDataSources.put(DataSourceEnum.DB1.getValue(), db1);        targetDataSources.put(DataSourceEnum.DB2.getValue(), db2);        //添加数据源        multipleDataSource.setTargetDataSources(targetDataSources);        //设置默认数据源        multipleDataSource.setDefaultTargetDataSource(db1);        return multipleDataSource;    }     @Bean("sqlSessionFactory")    public SqlSessionFactory sqlSessionFactory() throws Exception {        MybatisSqlSessionFactoryBean sqlSessionFactory = new MybatisSqlSessionFactoryBean();        sqlSessionFactory.setDataSource(multipleDataSource(db1(),db2()));         MybatisConfiguration configuration = new MybatisConfiguration();        configuration.setJdbcTypeForNull(JdbcType.NULL);        configuration.setMapUnderscoreToCamelCase(true);        configuration.setCacheEnabled(false);        sqlSessionFactory.setConfiguration(configuration);        //添加分页功能        sqlSessionFactory.setPlugins(paginationInterceptor());        return sqlSessionFactory.getObject();    }}

接下来需要具体的业务逻辑，在service层的类或者方法上面添加@DataSource注解来指定该业务需要用到的数据源，如下：

@Service@DataSource(DataSourceEnum.DB2)public class GatewayLogService {     @Autowired    private GatewayLogMapper mapper;     @Override    public Result> pageList(GatewayLogDTO gatewayLogDTO) {        LambdaQueryWrapper wrapper = Wrappers.lambdaQuery();        wrapper.like(StringUtils.isNotEmpty(gatewayLogDTO.getPath()), GatewayLog::getPath, gatewayLogDTO.getPath());        wrapper.like(StringUtils.isNotEmpty(gatewayLogDTO.getSourceServer()), GatewayLog::getSourceServer, gatewayLogDTO.getSourceServer());        wrapper.like(StringUtils.isNotEmpty(gatewayLogDTO.getTargetServer()), GatewayLog::getTargetServer, gatewayLogDTO.getTargetServer());        wrapper.eq(StringUtils.isNotEmpty(gatewayLogDTO.getMethod()), GatewayLog::getMethod, gatewayLogDTO.getMethod());        wrapper.like(StringUtils.isNotEmpty(gatewayLogDTO.getRequestBody()), GatewayLog::getRequestBody, gatewayLogDTO.getRequestBody());        wrapper.like(StringUtils.isNotEmpty(gatewayLogDTO.getResponse()), GatewayLog::getResponse, gatewayLogDTO.getResponse());        wrapper.orderByDesc(GatewayLog::getId);         IPage page = new Page<>(gatewayLogDTO.getPageNo(), gatewayLogDTO.getPageSize());         return Result.success(mapper.selectPage(page, wrapper));    } }

启动服务，调用相关的接口，我们会在控制台看到如下信息：

说明数据源切换成功！！！

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