记一次SpringBoot+myBatisPlus多数据源配置

最新推荐文章于 2024-03-10 23:06:18 发布

LiuLei_2015

最新推荐文章于 2024-03-10 23:06:18 发布

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分类专栏： spring框架文章标签： spring boot 后端

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本次项目中涉及了三组数据源：系统数据的mysql、tdEngine、shardingsphere分库分表的mysql。具体数据源的yml配置如下：

一、数据源配置1——YAML

spring:
   datasource:
    dynamic:
      primary: base
      strict: true
      datasource:
        base:
          username: ${MYSQL_USER}
          password: ${MYSQL_PWD}
          driver-class-name: com.mysql.cj.jdbc.Driver
          url: jdbc:mysql://${MYSQL_HOST}:${MYSQL_PORT}/base?useUnicode=true&characterEncoding=UTF-8&useJDBCCompliantTimezoneShift=true&useLegacyDatetimeCode=false&serverTimezone=GMT%2b8&enabledTLSProtocols=TLSv1.2&useSSL=false
          name: HikariCP-1
          hikari:
            pool-name: HikaraPool-1
            connection-timeout: 30000
            idle-timeout: 600000
            max-lifetime: 1800000
            maximum-pool-size: 6
            minimum-idle: 5
        detect:
          username: root
          password: taosdata
          driver-class-name: com.taosdata.jdbc.TSDBDriver
          url: jdbc:TAOS://${TAOS_HOST}:${TAOS_PORT}/detect
          name: HikariCP-2
          hikari:
            pool-name: HikaraPool-2
            connection-timeout: 30000
            idle-timeout: 600000
            max-lifetime: 1800000
            maximum-pool-size: 15
            minimum-idle: 5
  shardingsphere:
    # 打印sql
    props:
      sql-show: true
    datasource:
      dta_data:
        type: com.zaxxer.hikari.HikariDataSource
        url: jdbc:mysql://${MYSQL_HOST}:${MYSQL_PORT}/dta_data?useUnicode=true&characterEncoding=UTF-8&useJDBCCompliantTimezoneShift=true&useLegacyDatetimeCode=false&serverTimezone=GMT%2b8&enabledTLSProtocols=TLSv1.2&useSSL=false
        driver-class-name: com.mysql.cj.jdbc.Driver
        username: ${MYSQL_USER}
        password: ${MYSQL_PWD}
    rules:
      table1: dta_data
      table2: dta_data

二、数据源配置2——DynamicDataSourceProvider

使用DynamicDataSourceProvider后，可以用mybatis的@DS注解很方便地使用数据源了。

配置类如下：

private static final String SHARDING_DATA_SOURCE_NAME = "sharding";
/**
 * 动态数据源配置项
 */
@Autowired
private DynamicDataSourceProperties dynamicDataSourceProperties;

@Lazy
@Resource
private ShardingSphereDataSource shardingSphereDataSource;

  @Bean
    public DynamicDataSourceProvider dynamicDataSourceProvider() {
        Map<String, DataSourceProperty> datasourceMap = dynamicDataSourceProperties.getDatasource();
        return new AbstractDataSourceProvider() {
            @Override
            public Map<String, DataSource> loadDataSources() {
                Map<String, DataSource> dataSourceMap = createDataSourceMap(datasourceMap);

                // 将 shardingjdbc 管理的数据源也交给动态数据源管理
                dataSourceMap.put(SHARDING_DATA_SOURCE_NAME, shardingSphereDataSource);
                return dataSourceMap;
            }
        };
    }

    /**
     * 将动态数据源设置为首选的
     * 当spring存在多个数据源时, 自动注入的是首选的对象
     * 设置为主要的数据源之后，就可以支持shardingjdbc原生的配置方式了
     */
    @Primary
    @Bean
    public DataSource dataSource(DynamicDataSourceProvider dynamicDataSourceProvider) {
        DynamicRoutingDataSource dataSource = new DynamicRoutingDataSource();
        dataSource.setPrimary(dynamicDataSourceProperties.getPrimary());
        dataSource.setStrict(dynamicDataSourceProperties.getStrict());
        dataSource.setStrategy(dynamicDataSourceProperties.getStrategy());
        dataSource.setProvider(dynamicDataSourceProvider);
        dataSource.setP6spy(dynamicDataSourceProperties.getP6spy());
//        dataSource.setSeata(dynamicDataSourceProperties.getSeata());  // 如果报错，可能是Spring版本问题，注释即可。
        return dataSource;
    }

三、数据源使用

注解方式使用：

在mapper接口上或者具体的使用mapper的接口或者继承myBatis IService的接口上用@DS(“数据源名称”)，即可使用对应的数据源。

示例如下：

// 用法1：在接口上面
@DS("sharding")
public interface MyServerI extends IService<MyPo> {
    boolean refreshMyPo(MyPo mypo);
}

// 在具体方法上
 @DS("sharding")
 @Override
 public boolean saveMyPo(MyPo myPo) {
     return myServerI.save(myPo);
 }

从DynamicDataSourceProvider中获取数据源

示例如下

@Autowired
private DynamicRoutingDataSource routingDataSource;

public boolean insertDetectResult(DetectionItemResult detectionItemResult) {
        // 1、查询
        String qry = "xxxxx";
        try (
                Connection connection = routingDataSource.getDataSource("detect").getConnection();
                Statement stmt = connection.createStatement()
        ) {
            ResultSet resultSet = stmt.executeQuery(qry);
         // .....
        } catch (Exception e) {
            log.error("异常：", e);
        }
        return true;
    }

但是上面的配置对分库分表不灵活，当产生新的分表时，无法自动创建实际使用的数据表。可以通过手动配置分库分表的数据源。示例如下：

彩蛋：手动配置分库分表数据源

继承MybatisPlusAutoConfiguration，获取yml中配置的数据源信息。
用 ShardingSphereDataSourceFactory.createDataSource()创建分库分表数据源。
具体代码示例如下：

//-----shardingsphere数据源配置yml解析

@Data
@Component
@ConfigurationProperties(prefix = "spring.shardingsphere")
public class MultipleDbConfiguration {

    private Map<String, Datasource> datasource;
    private Map<String, String> rules;

    @Data
    public static class Datasource {
        private String url;
        private String driverClassName;
        private String username;
        private String password;
    }
}

// --------shardingsphere数据源创建、并加入到动态数据源map

@Slf4j
@Configuration
public class ShardingMybatisConfig extends MybatisPlusAutoConfiguration {

    private static final String SHARDING_DATA_SOURCE_NAME = "sharding";
    private final MultipleDbConfiguration multipleDbConfig;
    /**
     * 动态数据源配置项
     */
    @Autowired
    private DynamicDataSourceProperties dynamicDataSourceProperties;

    public ShardingMybatisConfig(MybatisPlusProperties properties,
                                 ObjectProvider<Interceptor[]> interceptorsProvider,
                                 ObjectProvider<TypeHandler[]> typeHandlersProvider,
                                 ObjectProvider<LanguageDriver[]> languageDriversProvider,
                                 ResourceLoader resourceLoader,
                                 ObjectProvider<DatabaseIdProvider> databaseIdProvider,
                                 ObjectProvider<List<ConfigurationCustomizer>> configurationCustomizersProvider,
                                 ObjectProvider<List<MybatisPlusPropertiesCustomizer>> mybatisPlusPropertiesCustomizerProvider,
                                 ApplicationContext applicationContext,
                                 MultipleDbConfiguration multipleDbConfig) {
        super(properties, interceptorsProvider, typeHandlersProvider, languageDriversProvider, resourceLoader, databaseIdProvider,
                configurationCustomizersProvider, mybatisPlusPropertiesCustomizerProvider,
                applicationContext);
        this.multipleDbConfig = multipleDbConfig;
    }

    @Bean
    public DataSource sharding() throws SQLException {
        // 配置真实数据源
        Map<String, MultipleDbConfiguration.Datasource> dbs = multipleDbConfig.getDatasource();
        Map<String, DataSource> dataSourceMap = new HashMap<>(dbs.size());
        for (String dbName : dbs.keySet()) {
            MultipleDbConfiguration.Datasource dbConfig = dbs.get(dbName);
            HikariDataSource dataSource = new HikariDataSource();
            dataSource.setDriverClassName(dbConfig.getDriverClassName());
            dataSource.setJdbcUrl(dbConfig.getUrl());
            dataSource.setUsername(dbConfig.getUsername());
            dataSource.setDriverClassName(dbConfig.getDriverClassName());
            dataSource.setPassword(dbConfig.getPassword());
            dataSourceMap.put(dbName, dataSource);
        }
        // 配置分片规则
        ShardingRuleConfiguration shardingRuleConfig = new ShardingRuleConfiguration();

        Map<String, String> rules = multipleDbConfig.getRules();

        for (final String table : rules.keySet()) {
            final String actualDataNodes = String.join(".", rules.get(table), table);
            final ShardingTableRuleConfiguration shardingTableRuleConfiguration = new ShardingTableRuleConfiguration(table, actualDataNodes);
            shardingRuleConfig.getTables().add(shardingTableRuleConfiguration);
        }

        shardingRuleConfig.setDefaultTableShardingStrategy(
                new StandardShardingStrategyConfiguration("分库或分表字段", "自定义的分库或分表算法类实例名称"));

        // 配置分表算法
        Properties tableShardingAlgorithmProps = new Properties();
        tableShardingAlgorithmProps.setProperty("strategy", "standard");
        tableShardingAlgorithmProps.setProperty("algorithmClassName", "自定义的分库或分表算法类实全路径");
        shardingRuleConfig.getShardingAlgorithms().put("myShardingAlgorithm",
                new ShardingSphereAlgorithmConfiguration("CLASS_BASED", tableShardingAlgorithmProps));

        // 开启Sql日志
        final Properties properties = new Properties();
        properties.setProperty("sql-show", "true");

        // 创建 ShardingSphereDataSource
        DataSource dataSource = ShardingSphereDataSourceFactory.createDataSource(dataSourceMap, Collections.singleton(shardingRuleConfig), properties);
        return dataSource;
    }

    @Bean
    public DynamicDataSourceProvider dynamicDataSourceProvider() {
        Map<String, DataSourceProperty> datasourceMap = dynamicDataSourceProperties.getDatasource();
        return new AbstractDataSourceProvider() {
            @SneakyThrows
            @Override
            public Map<String, DataSource> loadDataSources() {
                Map<String, DataSource> dataSourceMap = createDataSourceMap(datasourceMap);

                // 将 shardingjdbc 管理的数据源也交给动态数据源管理
                dataSourceMap.put(SHARDING_DATA_SOURCE_NAME, sharding());
                return dataSourceMap;
            }
        };
    }

    /**
     * 将动态数据源设置为首选的
     * 当spring存在多个数据源时, 自动注入的是首选的对象
     * 设置为主要的数据源之后，就可以支持shardingjdbc原生的配置方式了
     */
    @Primary
    @Bean
    public DataSource dataSource(DynamicDataSourceProvider dynamicDataSourceProvider) {
        DynamicRoutingDataSource dataSource = new DynamicRoutingDataSource();
        dataSource.setPrimary(dynamicDataSourceProperties.getPrimary());
        dataSource.setStrict(dynamicDataSourceProperties.getStrict());
        dataSource.setStrategy(dynamicDataSourceProperties.getStrategy());
        dataSource.setProvider(dynamicDataSourceProvider);
        dataSource.setP6spy(dynamicDataSourceProperties.getP6spy());
        return dataSource;
    }
}

// ------------我的分库分表算法

/**
 * Description:分表策略
 *
 * @author LiuLei
 * @version 1.0
 * @date 2023/9/13 18:02
 */
@Slf4j
public class MyShardingAlgorithm implements StandardShardingAlgorithm<Integer> {
    private static final String TABLE_SPLIT_SYMBOL = "_";

    @Override
    public String doSharding(Collection<String> availableTargetNames, PreciseShardingValue<Integer> shardingValue) {
        String logicTableName = shardingValue.getLogicTableName();
        ShardingTablesCacheEnum logicTable = ShardingTablesCacheEnum.of(logicTableName);
        if (logicTable == null) {
            log.error("逻辑表名未配置！logicTableNames：{}，logicTableName:{}",
                    ShardingTablesCacheEnum.logicTableNames(), logicTableName);
            throw new IllegalArgumentException("逻辑表名未配置！");
        }

        Integer value = shardingValue.getValue();
        String resultTableName = logicTableName + TABLE_SPLIT_SYMBOL + value;
        // 检查分表获取的表名是否存在，不存在则自动建表
        if (!availableTargetNames.contains(resultTableName)) {
            availableTargetNames.add(resultTableName);
        }
        return ShardingAlgorithmsTool.getShardingTableAndCreate(logicTable, resultTableName);
    }

    @Override
    public Collection<String> doSharding(Collection<String> availableTargetNames, RangeShardingValue<Integer> shardingValue) {
        log.error("进入了范围分表！");
        return null;
    }

    @Override
    public void init() {
    }

    @Override
    public String getType() {
        return null;
    }
}

// -----------服务启动时，自动刷新分库分表的表和自动根据sql请求，创建实际表

@Slf4j
public class ShardingAlgorithmsTool {
    /**
     * 表分片符号，例：system_msg_202201 中，分片符号为 "_"
     */
    private static final String TABLE_SPLIT_SYMBOL = "_";

    /**
     * 数据库配置
     */
    private static final Environment ENV = SpringUtil.getApplicationContext().getEnvironment();
    private static final String DATASOURCE_URL = ENV.getProperty("spring.shardingsphere.datasource." + ShardingTableEnum.DB_NAME.getValue() + ".url");
    private static final String DATASOURCE_USERNAME = ENV.getProperty("spring.shardingsphere.datasource." + ShardingTableEnum.DB_NAME.getValue() + ".username");
    private static final String DATASOURCE_PASSWORD = ENV.getProperty("spring.shardingsphere.datasource." + ShardingTableEnum.DB_NAME.getValue() + ".password");
    
    /**
     * 检查分表获取的表名是否存在，不存在则自动建表
     *
     * @param logicTable      逻辑表
     * @param resultTableName 真实表名
     * @return 确认存在于数据库中的真实表名
     */
    public static String getShardingTableAndCreate(ShardingTablesCacheEnum logicTable, String resultTableName) {
        // 缓存中有此表则返回，没有则判断创建
        if (logicTable.resultTableNamesCache().contains(resultTableName)) {
            return resultTableName;
        } else {
            // 未创建的表返回逻辑空表
            boolean isSuccess = createShardingTable(logicTable, resultTableName);
            return isSuccess ? resultTableName : logicTable.logicTableName();
        }
    }

    /**
     * 重载全部缓存
     */
    public static void tableNameCacheReloadAll() {
        Arrays.stream(ShardingTablesCacheEnum.values()).forEach(ShardingAlgorithmsTool::tableNameCacheReload);
    }

    /**
     * 重载指定分表缓存
     *
     * @param logicTable 逻辑表
     */
    public static void tableNameCacheReload(ShardingTablesCacheEnum logicTable) {
        // 读取数据库中所有表名
        List<String> tableNameList = getAllTableNameBySchema(logicTable);
        // 删除旧的缓存（如果存在）
        logicTable.resultTableNamesCache().clear();
        // 写入新的缓存
        logicTable.resultTableNamesCache().addAll(tableNameList);
        // 动态更新配置 actualDataNodes
        actualDataNodesRefresh(logicTable);
    }

    /**
     * 获取所有表名
     *
     * @param logicTable 逻辑表
     * @return 表名集合
     */
    public static List<String> getAllTableNameBySchema(ShardingTablesCacheEnum logicTable) {
        List<String> tableNames = new ArrayList<>();
        if (StringUtils.isEmpty(DATASOURCE_URL) || StringUtils.isEmpty(DATASOURCE_USERNAME) || StringUtils.isEmpty(DATASOURCE_PASSWORD)) {
            log.error(">>>>>>>>>> 【ERROR】数据库连接配置有误，请稍后重试，URL:{}, username:{}, password:{}", DATASOURCE_URL, DATASOURCE_USERNAME, DATASOURCE_PASSWORD);
            throw new IllegalArgumentException("数据库连接配置有误，请稍后重试");
        }

        try (Connection conn = DriverManager.getConnection(DATASOURCE_URL, DATASOURCE_USERNAME, DATASOURCE_PASSWORD);
             Statement st = conn.createStatement()) {
            String logicTableName = logicTable.logicTableName();
            try (ResultSet rs = st.executeQuery("show TABLES like '" + logicTableName + TABLE_SPLIT_SYMBOL + "%'")) {
                while (rs.next()) {
                    tableNames.add(rs.getString(1));
                }
            }
        } catch (SQLException e) {
            log.error(">>>>>>>>>> 【ERROR】数据库连接失败，请稍后重试，原因：{}", e.getMessage(), e);
            throw new IllegalArgumentException("数据库连接失败，请稍后重试");
        }
        return tableNames;
    }

    /**
     * 动态更新配置 actualDataNodes
     *
     * @param logicTable ShardingTablesCacheEnum
     */
    public static void actualDataNodesRefresh(ShardingTablesCacheEnum logicTable) {
        try {
            // 获取数据分片节点
            String dbName = ShardingTableEnum.DB_NAME.getValue();
            String logicTableName = logicTable.logicTableName();
            Set<String> tableNamesCache = logicTable.resultTableNamesCache();
            log.info(">>>>>>>>>> 【INFO】更新分表配置，logicTableName:{}，tableNamesCache:{}", logicTableName, tableNamesCache);

            String newActualDataNodes = tableNamesCache.stream().map(o -> String.format("%s.%s", dbName, o)).collect(Collectors.joining(","));
            ShardingSphereDataSource shardingSphereDataSource = SpringUtil.getBean("sharding", ShardingSphereDataSource.class);
            updateShardRuleActualDataNodes(shardingSphereDataSource, logicTableName, newActualDataNodes);
        } catch (Exception e) {
            log.error("初始化 动态表单失败，原因：{}", e.getMessage(), e);
        }
    }

    // --------------------------------------------------------------------------------------------------------------
    // 私有方法
    // --------------------------------------------------------------------------------------------------------------

    /**
     * 刷新ActualDataNodes
     */
    private static void updateShardRuleActualDataNodes(ShardingSphereDataSource dataSource, String logicTableName, String newActualDataNodes) {
        ContextManager contextManager = dataSource.getContextManager();
        String schemaName = "logic_db";
        Collection<RuleConfiguration> newRuleConfigList = new LinkedList<>();
        Collection<RuleConfiguration> oldRuleConfigList = dataSource.getContextManager()
                .getMetaDataContexts()
                .getMetaData(schemaName)
                .getRuleMetaData()
                .getConfigurations();

        for (RuleConfiguration oldRuleConfig : oldRuleConfigList) {
            if (oldRuleConfig instanceof ShardingRuleConfiguration) {

                // Algorithm provided sharding rule configuration
                ShardingRuleConfiguration oldAlgorithmConfig = (ShardingRuleConfiguration) oldRuleConfig;
                ShardingRuleConfiguration newAlgorithmConfig = new ShardingRuleConfiguration();

                // Sharding table rule configuration Collection
                Collection<ShardingTableRuleConfiguration> newTableRuleConfigList = new LinkedList<>();
                Collection<ShardingTableRuleConfiguration> oldTableRuleConfigList = oldAlgorithmConfig.getTables();

                oldTableRuleConfigList.forEach(oldTableRuleConfig -> {
                    if (logicTableName.equals(oldTableRuleConfig.getLogicTable())) {
                        ShardingTableRuleConfiguration newTableRuleConfig = new ShardingTableRuleConfiguration(oldTableRuleConfig.getLogicTable(), newActualDataNodes);
                        newTableRuleConfig.setTableShardingStrategy(oldTableRuleConfig.getTableShardingStrategy());
                        newTableRuleConfig.setDatabaseShardingStrategy(oldTableRuleConfig.getDatabaseShardingStrategy());
                        newTableRuleConfig.setKeyGenerateStrategy(oldTableRuleConfig.getKeyGenerateStrategy());

                        newTableRuleConfigList.add(newTableRuleConfig);
                    } else {
                        newTableRuleConfigList.add(oldTableRuleConfig);
                    }
                });

                newAlgorithmConfig.setTables(newTableRuleConfigList);
                newAlgorithmConfig.setAutoTables(oldAlgorithmConfig.getAutoTables());
                newAlgorithmConfig.setBindingTableGroups(oldAlgorithmConfig.getBindingTableGroups());
                newAlgorithmConfig.setBroadcastTables(oldAlgorithmConfig.getBroadcastTables());
                newAlgorithmConfig.setDefaultDatabaseShardingStrategy(oldAlgorithmConfig.getDefaultDatabaseShardingStrategy());
                newAlgorithmConfig.setDefaultTableShardingStrategy(oldAlgorithmConfig.getDefaultTableShardingStrategy());
                newAlgorithmConfig.setDefaultKeyGenerateStrategy(oldAlgorithmConfig.getDefaultKeyGenerateStrategy());
                newAlgorithmConfig.setDefaultShardingColumn(oldAlgorithmConfig.getDefaultShardingColumn());
                newAlgorithmConfig.setShardingAlgorithms(oldAlgorithmConfig.getShardingAlgorithms());
                newAlgorithmConfig.setKeyGenerators(oldAlgorithmConfig.getKeyGenerators());

                newRuleConfigList.add(newAlgorithmConfig);
            }
        }
        contextManager.alterRuleConfiguration(schemaName, newRuleConfigList);
    }

    /**
     * 创建分表
     *
     * @param logicTable      逻辑表
     * @param resultTableName 真实表名，例：logicTableName_xxx
     * @return 创建结果（true创建成功，false未创建）
     */
    private static boolean createShardingTable(ShardingTablesCacheEnum logicTable, String resultTableName) {
        synchronized (logicTable.logicTableName().intern()) {
            // 缓存中有此表 返回
            if (logicTable.resultTableNamesCache().contains(resultTableName)) {
                return false;
            }
            // 缓存中无此表，则建表并添加缓存
            executeSql(Collections.singletonList("CREATE TABLE IF NOT EXISTS `" + resultTableName + "` LIKE `" + logicTable.logicTableName() + "`;"));
            // 缓存重载
            tableNameCacheReload(logicTable);
        }
        return true;
    }

    /**
     * 执行SQL
     *
     * @param sqlList SQL集合
     */
    private static void executeSql(List<String> sqlList) {
        if (StringUtils.isEmpty(DATASOURCE_URL) || StringUtils.isEmpty(DATASOURCE_USERNAME) || StringUtils.isEmpty(DATASOURCE_PASSWORD)) {
            log.error(">>>>>>>>>> 【ERROR】数据库连接配置有误，请稍后重试，URL:{}, username:{}, password:{}", DATASOURCE_URL, DATASOURCE_USERNAME, DATASOURCE_PASSWORD);
            throw new IllegalArgumentException("数据库连接配置有误，请稍后重试");
        }
        try (Connection conn = DriverManager.getConnection(DATASOURCE_URL, DATASOURCE_USERNAME, DATASOURCE_PASSWORD)) {
            try (Statement st = conn.createStatement()) {
                conn.setAutoCommit(false);
                for (String sql : sqlList) {
                    st.execute(sql);
                }
            } catch (Exception e) {
                conn.rollback();
                log.error(">>>>>>>>>> 【ERROR】数据表创建执行失败，请稍后重试，原因：{}", e.getMessage(), e);
                throw new IllegalArgumentException("数据表创建执行失败，请稍后重试");
            }
        } catch (SQLException e) {
            log.error(">>>>>>>>>> 【ERROR】数据库连接失败，请稍后重试，原因：{}", e.getMessage(), e);
            throw new IllegalArgumentException("数据库连接失败，请稍后重试");
        }
    }

}

public enum ShardingTablesCacheEnum {
    MY_TB("my_tb", new HashSet<>());
    private static Map<String, ShardingTablesCacheEnum> valueMap = new HashMap<>();

    static {
        Arrays.stream(ShardingTablesCacheEnum.values()).forEach(o -> valueMap.put(o.logicTableName, o));
    }

    /**
     * 逻辑表名
     */
    private final String logicTableName;
    /**
     * 实际表名
     */
    private final Set<String> resultTableNamesCache;

    ShardingTablesCacheEnum(String logicTableName, Set<String> resultTableNamesCache) {
        this.logicTableName = logicTableName;
        this.resultTableNamesCache = resultTableNamesCache;
    }

    public static ShardingTablesCacheEnum of(String value) {
        return valueMap.get(value);
    }

    public static Set<String> logicTableNames() {
        return valueMap.keySet();
    }

    public String logicTableName() {
        return logicTableName;
    }

    public Set<String> resultTableNamesCache() {
        return resultTableNamesCache;
    }

    @Override
    public String toString() {
        return "ShardingTableCacheEnum{" +
                "logicTableName='" + logicTableName + '\'' +
                ", resultTableNamesCache=" + resultTableNamesCache +
                '}';
    }
}

// --------------启动服务调用

@Order(value = 1) // 数字越小，越先执行
@Component
public class ShardingTableLoadRunner implements CommandLineRunner {

    @Override
    public void run(String... args) {
        // 读取已有分表，进行缓存
        ShardingAlgorithmsTool.tableNameCacheReloadAll();
    }
}