code: /*
   * Licensed to the Apache Software Foundation (ASF) under one or more
   * contributor license agreements.  See the NOTICE file distributed with
   * this work for additional information regarding copyright ownership.
   * The ASF licenses this file to You under the Apache License, Version 2.0
   * (the "License"); you may not use this file except in compliance with
   * the License.  You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   *
   */
  
  package org.apache.skywalking.oap.server.storage.plugin.jdbc.common.dao;
  
  import lombok.RequiredArgsConstructor;
  import lombok.SneakyThrows;
  import org.apache.skywalking.oap.server.core.analysis.topn.TopN;
  import org.apache.skywalking.oap.server.core.query.enumeration.Order;
  import org.apache.skywalking.oap.server.core.query.input.Duration;
  import org.apache.skywalking.oap.server.core.query.input.RecordCondition;
  import org.apache.skywalking.oap.server.core.query.type.Record;
  import org.apache.skywalking.oap.server.core.storage.query.IRecordsQueryDAO;
  import org.apache.skywalking.oap.server.library.client.jdbc.hikaricp.JDBCClient;
  import org.apache.skywalking.oap.server.library.util.StringUtil;
  import org.apache.skywalking.oap.server.storage.plugin.jdbc.common.JDBCTableInstaller;
  import org.apache.skywalking.oap.server.storage.plugin.jdbc.common.SQLAndParameters;
  import org.apache.skywalking.oap.server.storage.plugin.jdbc.common.TableHelper;
  
  import java.util.ArrayList;
  import java.util.List;
  
  @RequiredArgsConstructor
  public class JDBCRecordsQueryDAO implements IRecordsQueryDAO {
      private final JDBCClient jdbcClient;
      private final TableHelper tableHelper;
  
      @Override
      @SneakyThrows
      public List<Record> readRecords(final RecordCondition condition,
                                      final String valueColumnName,
                                      final Duration duration) {
          final var tables = tableHelper.getTablesForRead(
              condition.getName(),
              duration.getStartTimeBucket(),
              duration.getEndTimeBucket()
          );
          final var results = new ArrayList<Record>();
  
          for (String table : tables) {
              final var sqlAndParameters = buildSQL(condition, valueColumnName, duration, table);
              jdbcClient.executeQuery(
                  sqlAndParameters.sql(),
                  resultSet -> {
                      while (resultSet.next()) {
                          Record record = new Record();
                          record.setName(resultSet.getString(TopN.STATEMENT));
                          final String refId = resultSet.getString(TopN.TRACE_ID);
                          record.setRefId(StringUtil.isEmpty(refId) ? "" : refId);
                          record.setId(record.getRefId());
                          record.setValue(String.valueOf(resultSet.getInt(valueColumnName)));
                          results.add(record);
                      }
                      return null;
                  },
                  sqlAndParameters.parameters());
          }
  
          return results;
      }
  
      protected static SQLAndParameters buildSQL(
          RecordCondition condition,
          String valueColumnName,
          Duration duration,
          String table) {
          StringBuilder sql = new StringBuilder("select * from " + table + " where ");
          List<Object> parameters = new ArrayList<>(10);
          sql.append(JDBCTableInstaller.TABLE_COLUMN).append(" = ?");
          parameters.add(condition.getName());
          sql.append(" and ").append(TopN.ENTITY_ID).append(" = ? and");
          parameters.add(condition.getParentEntity().buildId());
          sql.append(" ").append(TopN.TIME_BUCKET).append(" >= ?");
          parameters.add(duration.getStartTimeBucketInSec());
          sql.append(" and ").append(TopN.TIME_BUCKET).append(" <= ?");
          parameters.add(duration.getEndTimeBucketInSec());
  
          sql.append(" order by ").append(valueColumnName);
          if (condition.getOrder().equals(Order.DES)) {
              sql.append(" desc ");
          } else {
              sql.append(" asc ");
          }
          sql.append(" limit ").append(condition.getTopN());
  
          return new SQLAndParameters(sql.toString(), parameters);
      }
  }
  