mysql分库分表后的查询

import org.apache.shardingsphere.api.config.sharding.ShardingRuleConfiguration;
import org.apache.shardingsphere.api.config.sharding.TableRuleConfiguration;
import org.apache.shardingsphere.api.config.sharding.strategy.StandardShardingStrategyConfiguration;
import org.apache.shardingsphere.shardingjdbc.api.ShardingDataSourceFactory;

import javax.sql.DataSource;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.HashMap;
import java.util.Map;
import java.util.Properties;

public class ShardingExample {
    public static void main(String[] args) throws Exception {
        // 配置分库分表规则
        ShardingRuleConfiguration shardingRuleConfig = new ShardingRuleConfiguration();
        TableRuleConfiguration tableRuleConfig = new TableRuleConfiguration("t_order", "ds${0..1}.t_order${0..1}");
        tableRuleConfig.setKeyGeneratorConfig(new KeyGeneratorConfiguration("SNOWFLAKE", "order_id"));
        shardingRuleConfig.getTableRuleConfigs().add(tableRuleConfig);
        shardingRuleConfig.setDefaultDatabaseShardingStrategyConfig(new StandardShardingStrategyConfiguration("user_id", new PreciseShardingAlgorithm() {
            @Override
            public String doSharding(Collection<String> availableTargetNames, PreciseShardingValue<Long> shardingValue) {
                return "ds" + (shardingValue.getValue() % 2);
            }
        }));
        shardingRuleConfig.setDefaultTableShardingStrategyConfig(new StandardShardingStrategyConfiguration("order_id", new PreciseShardingAlgorithm() {
            @Override
            public String doSharding(Collection<String> availableTargetNames, PreciseShardingValue<Long> shardingValue) {
                return "t_order" + (shardingValue.getValue() % 2);
            }
        }));

        // 创建数据源
        Properties properties = new Properties();
        properties.setProperty("sql.show", "true");
        DataSource dataSource = ShardingDataSourceFactory.createDataSource(createDataSourceMap(), shardingRuleConfig, properties);

        // 执行查询
        try (Connection conn = dataSource.getConnection();
             Statement stmt = conn.createStatement();
             ResultSet rs = stmt.executeQuery("SELECT * FROM t_order WHERE user_id = 1")) {
            while (rs.next()) {
                System.out.println(rs.getString("order_id"));
            }
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }

    private static Map<String, DataSource> createDataSourceMap() {
        Map<String, DataSource> result = new HashMap<>();
        result.put("ds0", createDataSource("ds0"));
        result.put("ds1", createDataSource("ds1"));
        return result;
    }

    private static DataSource createDataSource(final String dataSourceName) {
        // 创建数据源的逻辑（可以使用HikariCP、Druid等）
        return null;
    }
}