Exemplo n.º 1
0
  /**
   * 按主键查找一条数据
   *
   * @param lineCode 线路名称
   * @return LineLossDto
   * @throws Exception
   */
  public LineLossDto findByPrimaryKey(String lineCode) throws Exception {
    StringBuffer buffer = new StringBuffer(200);
    // 拼SQL语句
    buffer.append("SELECT ");
    buffer.append("LineCode,");
    buffer.append("R,");
    buffer.append("LineLong,");
    buffer.append("Volt,");
    buffer.append("T,");
    buffer.append("ValidStatus,");
    buffer.append("Flag,");
    buffer.append("Remark ");
    buffer.append("FROM LineLoss ");
    if (logger.isDebugEnabled()) {
      StringBuffer debugBuffer = new StringBuffer(buffer.length() * 4);
      debugBuffer.append(buffer.toString());
      debugBuffer.append("WHERE ");
      debugBuffer.append("LineCode=").append("'").append(lineCode).append("'");
      logger.debug(debugBuffer.toString());
    }

    buffer.append("WHERE ");
    buffer.append("LineCode = ?");

    dbManager.prepareStatement(buffer.toString());
    // 设置条件字段;
    dbManager.setString(1, lineCode);
    ResultSet resultSet = dbManager.executePreparedQuery();
    LineLossDto lineLossDto = null;
    if (resultSet.next()) {
      lineLossDto = new LineLossDto();
      lineLossDto.setLineCode(dbManager.getString(resultSet, 1));
      lineLossDto.setR(dbManager.getDouble(resultSet, 2));
      lineLossDto.setLineLong(dbManager.getDouble(resultSet, 3));
      lineLossDto.setVolt(dbManager.getDouble(resultSet, 4));
      lineLossDto.setT(dbManager.getDouble(resultSet, 5));
      lineLossDto.setValidStatus(dbManager.getString(resultSet, 6));
      lineLossDto.setFlag(dbManager.getString(resultSet, 7));
      lineLossDto.setRemark(dbManager.getString(resultSet, 8));
    }
    resultSet.close();
    return lineLossDto;
  }
Exemplo n.º 2
0
  /**
   * 按条件查询多条数据
   *
   * @param conditions 查询条件
   * @param pageNo 页号
   * @param rowsPerPage 每页的行数
   * @return Collection
   * @throws Exception
   */
  public Collection findByConditions(String conditions, int pageNo, int rowsPerPage)
      throws Exception {
    StringBuffer buffer = new StringBuffer(200);
    // 拼SQL语句
    buffer.append("SELECT ");
    buffer.append("LineCode,");
    buffer.append("R,");
    buffer.append("LineLong,");
    buffer.append("Volt,");
    buffer.append("T,");
    buffer.append("ValidStatus,");
    buffer.append("Flag,");
    buffer.append("Remark ");
    buffer.append("FROM LineLoss WHERE ");
    buffer.append(conditions);
    boolean supportPaging = false; // 数据库是否支持分页
    if (pageNo > 0) {
      // 对Oracle优化
      if (dbManager
          .getConnection()
          .getMetaData()
          .getDatabaseProductName()
          .equalsIgnoreCase("Oracle")) {
        buffer.insert(0, "SELECT * FROM ( SELECT row_.*, rownum rownum_ FROM (");
        buffer.append(
            ") row_ WHERE rownum <= "
                + rowsPerPage * pageNo
                + ") WHERE rownum_ > "
                + rowsPerPage * (pageNo - 1));
        supportPaging = true;
      } else if (dbManager
          .getConnection()
          .getMetaData()
          .getDatabaseProductName()
          .equalsIgnoreCase("DB2")) {
        String sql = buffer.toString();
        buffer.setLength(0);
        buffer.append("select * from ( select rownumber() over(");
        int orderByIndex = sql.toLowerCase().indexOf("order by");
        if (orderByIndex > 0) {
          buffer.append(sql.substring(orderByIndex));
        }
        buffer.append(") as rownumber_,");
        buffer.append(sql.substring(6));
        buffer.append(" ) as temp_ where rownumber_");
        buffer.append(
            " between " + (rowsPerPage * (pageNo - 1) + 1) + " and " + rowsPerPage * pageNo);
        supportPaging = true;
      }
    }
    if (logger.isDebugEnabled()) {
      logger.debug(buffer.toString());
    }
    ResultSet resultSet = dbManager.executeQuery(buffer.toString());
    int count = 0;
    if (supportPaging == false && pageNo > 1) {
      dbManager.locate(resultSet, rowsPerPage * (pageNo - 1));
    }

    // 定义返回结果集合
    Collection collection = new ArrayList(rowsPerPage);
    LineLossDto lineLossDto = null;
    while (resultSet.next()) {
      if (supportPaging == false && pageNo > 0) {
        count++;
        if (count > rowsPerPage) {
          break;
        }
      }

      lineLossDto = new LineLossDto();
      lineLossDto.setLineCode(dbManager.getString(resultSet, "LineCode"));
      lineLossDto.setR(dbManager.getDouble(resultSet, "R"));
      lineLossDto.setLineLong(dbManager.getDouble(resultSet, "LineLong"));
      lineLossDto.setVolt(dbManager.getDouble(resultSet, "Volt"));
      lineLossDto.setT(dbManager.getDouble(resultSet, "T"));
      lineLossDto.setValidStatus(dbManager.getString(resultSet, "ValidStatus"));
      lineLossDto.setFlag(dbManager.getString(resultSet, "Flag"));
      lineLossDto.setRemark(dbManager.getString(resultSet, "Remark"));
      collection.add(lineLossDto);
    }
    resultSet.close();
    return collection;
  }