Mybatis plus Dynamic Datasource 动态数据源及使用方式

<dependency>
    <groupId>com.baomidou</groupId>
    <artifactId>dynamic-datasource-spring-boot-starter</artifactId>
    <version>${version}</version>
</dependency>

<dependency>
    <groupId>com.baomidou</groupId>
    <artifactId>dynamic-datasource-spring-boot3-starter</artifactId>
    <version>${version}</version>
</dependency>

spring:
  datasource:
    dynamic:
      enabled: true #启用动态数据源，默认true
      primary: master #设置默认的数据源或者数据源组,默认值即为master
      strict: false #严格匹配数据源,默认false. true未匹配到指定数据源时抛异常,false使用默认数据源
      grace-destroy: false #是否优雅关闭数据源，默认为false，设置为true时，关闭数据源时如果数据源中还存在活跃连接，至多等待10s后强制关闭
      datasource:
        master:
          url: jdbc:mysql://xx.xx.xx.xx:3306/dynamic
          username: root
          password: 123456
          driver-class-name: com.mysql.jdbc.Driver # 3.2.0开始支持SPI可省略此配置
        slave_1:
          url: jdbc:mysql://xx.xx.xx.xx:3307/dynamic
          username: root
          password: 123456
          driver-class-name: com.mysql.jdbc.Driver
        slave_2:
          url: ENC(xxxxx) # 内置加密,使用请查看详细文档
          username: ENC(xxxxx)
          password: ENC(xxxxx)
          driver-class-name: com.mysql.jdbc.Driver
        #......省略
        #以上会配置一个默认库master，一个组slave下有两个子库slave_1,slave_2

spring:
  datasource:
    dynamic:
      datasource:
        master_1:
        master_2:
        slave_1:
        slave_2:
        slave_3:

spring:
  datasource:
    dynamic:
      datasource:
        mysql:
        oracle:
        sqlserver:
        postgresql:
        h2:

spring:
  datasource:
    dynamic:
      datasource:
        master:
        slave_1:
        slave_2:
        oracle_1:
        oracle_2:

@Service
@DS("slave")
public class UserServiceImpl implements UserService {
    @Autowired
    private JdbcTemplate jdbcTemplate;
    public List selectAll() {
        return jdbcTemplate.queryForList("select * from user");
    }
    @Override
    @DS("slave_1")
    public List selectByCondition() {
        return jdbcTemplate.queryForList("select * from user where age >10");
    }
}

// 切换到slave数据库
DynamicDataSourceContextHolder.push("slave");

@Resource
private DataSource dataSource;
@Resource
private DefaultDataSourceCreator dataSourceCreator;
public void add(){
    DynamicRoutingDataSource ds = (DynamicRoutingDataSource) dataSource;
    // 配置数据源
    DataSourceProperty dataSourceProperty = new DataSourceProperty();
    dataSourceProperty.setLazy(true);
    dataSourceProperty.setUsername("root");
    dataSourceProperty.setPassword("123456");
    dataSourceProperty.setUrl(url);
    dataSourceProperty.setDriverClassName(driverClassName);
    // 添加数据源
    ds.addDataSource(key, dataSourceCreator.createDataSource(dataSourceProperty));
}  

@Mapper
public interface DatabaseMapper {
    @Select("CREATE DATABASE IF NOT EXISTS ${databaseName}")
    void createDatabase( String databaseName);
}

 // 配置数据源
DataSourceProperty dataSourceProperty = new DataSourceProperty();
dataSourceProperty.setLazy(true);
dataSourceProperty.setUsername(username);
dataSourceProperty.setPassword(password);
dataSourceProperty.setUrl(url);
dataSourceProperty.setDriverClassName(driverClassName);
// 创建sqlSessionFactory，配置mapper类
MybatisSqlSessionFactoryBean sqlSessionFactoryBean = new MybatisSqlSessionFactoryBean();
MybatisConfiguration configuration = new MybatisConfiguration();
configuration.addMapper(DatabaseMapper.class);
sqlSessionFactoryBean.setConfiguration(configuration);
        sqlSessionFactoryBean.setDataSource(dataSourceCreator.createDataSource(dataSourceProperty));
// 获取sqlSession
SqlSession sqlSession = Objects.requireNonNull(sqlSessionFactoryBean.getObject()).openSession();
DatabaseMapper mapper = sqlSession.getMapper(DatabaseMapper.class);
// 初始化数据库，参数为数据库名注意要使用 `` 包裹起来。
mapper.createDatabase("`databaseName`");

ResourceDatabasePopulator popular = new ResourceDatabasePopulator();
// xxx.sql 为resource目录下文件。
popular.addScript(new ClassPathResource("xxx.sql"));
// 传入数据源执行sql脚本。
popular.execute(dataSource);