Java中sharding-jdbc按年月分片的示例代码

        <!--shardingjdbc分片，和Druid不兼容，如果不使用sharding则需要注释-->
        <dependency>
            <groupId>org.apache.shardingsphere</groupId>
            <artifactId>sharding-jdbc-spring-boot-starter</artifactId>
            <version>4.1.1</version>
        </dependency>

spring:
  autoconfigure:
    exclude: com.alibaba.druid.spring.boot.autoconfigure.DruidDataSourceAutoConfigure
  main:
    allow-bean-definition-overriding: true
  shardingsphere:
    #配置数据源
    datasource:
      names: ds-master
      ds-master:
        type: com.alibaba.druid.pool.DruidDataSource
        driver-class-name: com.mysql.cj.jdbc.Driver
        url: jdbc:mysql://***:3306/aihosp?useUnicode=true&characterEncoding=UTF-8&allowMultiQueries=true&serverTimezone=GMT%2B8&rewriteBatchedStatements=true
        username: ***
        password: ***
    sharding:
      tables:
        table1:
          actual-data-nodes: ds-master.table1_$->{2021..2025}  #按年分表
          tableStrategy:
            standard: #用于单分片键的标准分片场景
              sharding-column: create_time
              precise-algorithm-class-name: com.**.common.algorithm.PreciseRangeShardingAlgorithm # 精确分片算法类名称，用于=和IN。该类需实现PreciseShardingAlgorithm接口并提供无参数的构造器
              range-algorithm-class-name: com.**.common.algorithm.PreciseRangeShardingAlgorithm #范围分片算法类名称，用于BETWEEN，可选。该类需实现RangeShardingAlgorithm接口并提供无参数的构造器
          key-generator:
            column: id
            type: SNOWFLAKE #分布式全局ID（雪花算法）
            retry-interval-milliseconds: 500
        table2:
          actual-data-nodes: ds-master.table2_$->{2022..2025}0$->{1..9},ds-master.table2_$->{2022..2025}1$->{0..2}  #按月分表
          tableStrategy:
            standard: #用于单分片键的标准分片场景
              sharding-column: create_date
              precise-algorithm-class-name: com.**.common.algorithm.PreciseRangeShardingAlgorithm
              range-algorithm-class-name: com.**.common.algorithm.PreciseRangeShardingAlgorithm
          key-generator:
            column: id
            type: SNOWFLAKE #分布式全局ID（雪花算法）
            retry-interval-milliseconds: 500
    #其他运行属性
    props:
      sql:
        show: false # 是否显示日志

/**
 *
 * 按年分片
 * 精准分库PreciseShardingDBAlgorithm
 *
 * 范围分库RangeShardingDBAlgorithm
 *
 * 精准分表PreciseShardingTableAlgorithm
 *
 * 范围分表RangeShardingTableAlgorithm：
 */
@Slf4j
public class PreciseRangeShardingAlgorithm implements PreciseShardingAlgorithm<String>,RangeShardingAlgorithm<String> {
    /**
     *  RangeShardingAlgorithm的重写  根据传入的分片健的值，对所有待选择的表中 根据自己的业务逻辑进行判断，选择符合条件的表返回
     * @param tableNameList 返回需要查询的表
     * @param shardingValue 传入的分片健的值
     * @return 返回符合条件的表名称
     */
    @Override
    public Collection<String> doSharding(Collection<String> tableNameList, RangeShardingValue<String> shardingValue) {
        System.out.println("[MyTableRangeShardingAlgorithm] shardingValue: [{}]\n"+ shardingValue);
        Set<String> tableNameResultList = new LinkedHashSet<>();
        Range<String> rangeValue = shardingValue.getValueRange();
        String flag = "year";
        for (String tableName : tableNameList) {
            if (tableName.startsWith("table2")) {
                flag = "month";
                break;
            }
        }
        if ("year".equals(flag)) {
            int lowInt = Integer.parseInt(rangeValue.lowerEndpoint().substring(0,5).replaceAll("-",""));
            int upperInt = Integer.parseInt(rangeValue.upperEndpoint().substring(0,5).replaceAll("-",""));
            for (String tableNameItem : tableNameList) {
                String substring = tableNameItem.substring(tableNameItem.length() - 4);
                int tableItem = Integer.valueOf(substring);
                if(tableItem >=  lowInt && tableItem <= upperInt ){
                    tableNameResultList.add(tableNameItem);
                }
            }
        } else if ("month".equals(flag)) {
            int lowInt = Integer.parseInt(rangeValue.lowerEndpoint().substring(0,7).replaceAll("-",""));
            int upperInt = Integer.parseInt(rangeValue.upperEndpoint().substring(0,7).replaceAll("-",""));
            for (String tableNameItem : tableNameList) {
                String substring = tableNameItem.substring(tableNameItem.length() - 6,tableNameItem.length());
                int tableItem = Integer.valueOf(substring);
                if(tableItem >=  lowInt && tableItem <= upperInt ){
                    tableNameResultList.add(tableNameItem);
                }
            }
        }
        return tableNameResultList;
    }
    /** PreciseShardingAlgorithm的重写 */
    @Override
    public String doSharding(Collection<String> collection, PreciseShardingValue<String> preciseShardingValue) {
        String s = buildShardingTable(preciseShardingValue.getLogicTableName(), preciseShardingValue.getValue());
        return s;
    }
    /**
     * 构建分片后的表名
     * @param logicTableName
     * @param date
     * @return
     */
    private String buildShardingTable(String logicTableName, String date) {
        StringBuffer stringBuffer = new StringBuffer(logicTableName).append("_").append(date, 0, 4);
        if (logicTableName.startsWith("table2")) {
            // 月分表
           stringBuffer = new StringBuffer(logicTableName).append("_").append(date, 0, 4)
                    .append(date, 5, 7);
        }
        return stringBuffer.toString();
    }
}