content: /**
   * Copyright (C) 2024 AIDC-AI
   *
   * Licensed 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 com.alibaba.langengine.duckdb.docloader;
  
  import com.alibaba.fastjson.JSON;
  import com.alibaba.langengine.core.docloader.BaseLoader;
  import com.alibaba.langengine.core.indexes.Document;
  import lombok.Data;
  import lombok.extern.slf4j.Slf4j;
  import org.springframework.jdbc.core.JdbcTemplate;
  
  import java.util.List;
  import java.util.Map;
  import java.util.stream.Collectors;
  
  /**
   * Loads a query result from DuckDB into a list of documents.
   * https://duckdb.org/
   * https://github.com/duckdb
   *
   * @author xiaoxuan.lp
   */
  @Slf4j
  @Data
  public class DuckDBLoader extends BaseLoader {
  
      private JdbcTemplate jdbcTemplate;
  
      /**
       * sql脚本
       */
      private String sql;
  
      @Override
      public List<Document> load() {
          List<Map<String, Object>> list = jdbcTemplate.queryForList(sql);
  
          List<Document> documents = list.stream().map(map -> {
              Document document = new Document();
              document.setPageContent(JSON.toJSONString(map));
              return document;
          }).collect(Collectors.toList());
          return documents;
      }
  }
  