將哈希映射放入另一個集合中的問題

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在下面的代碼中，當在循環內打印時，子哈希映射顯示正確的值，但是當在循環外部打印父哈希映射時，子哈希映射只顯示具有最後一個條目包含所有的值。將哈希映射放入另一個集合中的問題

public void compareOracleMySQLData() throws SQLException { 
    String inputTableName = ConfigurationManager.getProperty("table_name"); 

    int i = 0; 
    int j = 0; 
    int colCount = 0; 
    int oracleRowCount = 0; 
    int mysqlRowCount = 0; 
    String primaryKeyIni = null; 
    String appendStuff = null; 
    Connection conO = DBManager.openDbConnection("mysql"); 
    Connection conM = DBManager.openDbConnection("mysql"); 
    Statement stmtO = null; 
    Statement stmtM = null; 
    ResultSet resultSetO = null; 
    ResultSet resultSetM = null; 
    ArrayList<String> primaryKeyList = new ArrayList<String>(); 
    Iterator<String> primaryKeyListItr = null; 
    HashMap<Object, Object> oraRowDetailsMap = new HashMap<Object, Object>(); 
    HashMap<String, Object> mysqlRowDetailsMap = new HashMap<String, Object>(); 
    Map<String, Object> oraRowPrimaryMap = new HashMap<String, Object>(); 
    HashMap<String, HashMap<String, Object>> mysqlRowPrimaryMap = new HashMap<String, HashMap<String, Object>>(); 
// Map<String, Object> oraRowPrimaryMap=new HashMap<String, Object>(); 
// Map<String, Object> mysqlRowPrimaryMap=new HashMap<String, Object>(); 
    try { 
     if (conO != null && conM != null) { 
      if (validateTableStatus(inputTableName, conO, conM)) { 
       // Check table existence in Oracle and Mysql Database 

       // Create resultset for oracle 
       stmtO = conO.createStatement(
         ResultSet.TYPE_SCROLL_INSENSITIVE, 
         ResultSet.CONCUR_READ_ONLY); 
       resultSetO = stmtO.executeQuery(DB_QUERY); 
       ResultSetMetaData rsMetaDataO = resultSetO.getMetaData(); 

       // 

       // MySql details for the same table created 
       stmtM = conM.createStatement(
         ResultSet.TYPE_SCROLL_INSENSITIVE, 
         ResultSet.CONCUR_READ_ONLY); 
       resultSetM = stmtM.executeQuery(DB_QUERY); 

       // Get Column Count for two tables 
       ResultSetMetaData rsMetaDataM = resultSetM.getMetaData(); 
       logger.debug("Column Count in Oracle table ::" 
         + rsMetaDataO.getColumnCount()); 
       logger.debug("Column Count in Mysql table ::" 
         + rsMetaDataM.getColumnCount()); 
       // Match Column count of two tables 
       if (rsMetaDataM.getColumnCount() == rsMetaDataO 
         .getColumnCount()) { 
        logger.debug("The Column count in both table are same"); 
        oracleRowCount = getRowCount(inputTableName, resultSetO); 
        mysqlRowCount = getRowCount(inputTableName, resultSetM); 
        logger.debug("No of Rows of Oracle Table :: " 
          + oracleRowCount); 
        logger.debug("No of Rows of Mysql Table :: " 
          + mysqlRowCount); 
        if (oracleRowCount != mysqlRowCount) { 
         logger 
           .debug("The number of rows of Oracle and Mysql tables respectively differs"); 

        } 



        else { 
         primaryKeyList = getPrimaryKey(inputTableName, conO); 

         while (resultSetO.next()) { 

          i = 0; 
          primaryKeyListItr = primaryKeyList.iterator(); 
          while (primaryKeyListItr.hasNext()) { 

           if (i == 0) { 
            primaryKeyIni = (resultSetO 
              .getObject(primaryKeyListItr 
                .next().toString())) 
              .toString().trim(); 


           } else { 
            appendStuff = (resultSetO 
              .getObject(primaryKeyListItr 
                .next().toString())) 
              .toString().trim(); 
            primaryKeyIni = primaryKeyIni + "$" 
              + appendStuff; 

           } 
           i++; 

          } 

          // 

          colCount = rsMetaDataO.getColumnCount(); 
          for (j = 1; j <= colCount; j++) { 
           System.out.println("Col Name"+rsMetaDataO 
             .getColumnName(j)); 
           System.out.println("Col Value"+ resultSetO 
             .getObject(rsMetaDataO 
               .getColumnName(j))); 
           oraRowDetailsMap.put(rsMetaDataO 
             .getColumnName(j), resultSetO 
             .getObject(rsMetaDataO 
               .getColumnName(j))); 
          } 
           System.out.println("primaryKeyIni"+primaryKeyIni); 
          System.out.println("oraRowDetailsMap inside loop"+oraRowDetailsMap); 
          oraRowPrimaryMap.put(primaryKeyIni, 
            oraRowDetailsMap); 
    } 
    System.out.println("oraRowDetailsMap"+oraRowDetailsMap);System.out.println(oraRowPrimaryMap); 

      } 

       } else { 
        logger.debug("The number of Columns of Oracle and Mysql table differs"); 
       } 

      } 
     } 
    } 

    catch (SQLException e) { 
     logger.debug("Error in CompareOracleMySQLData()" + e.getMessage()); 
    } catch (Exception e) { 
     // TODO Auto-generated catch block 
     e.printStackTrace(); 
    } finally { 
     DBManager.closeConnection(conO); 
     DBManager.closeConnection(conM); 
     DBManager.closeStatement(stmtO); 
     DBManager.closeStatement(stmtM); 
     DBManager.closeResultSet(resultSetO); 
     DBManager.closeResultSet(resultSetM);}}

2.輸出低於::

     DEPLOYMENT_LEVEL is: DVL 
DEBUG com.tsh.compass.intranet.dao.DbDao 18 Jun 2011 23:06:39 IST. - Connection to  MYSQL database established 
DEBUG com.tsh.compass.intranet.dao.DbDao 18 Jun 2011 23:06:39 IST. - Connection to  MYSQL database established 
DEBUG com.tsh.compass.intranet.dao.DbDao 18 Jun 2011 23:06:39 IST. - Column Count in Oracle table ::4 
DEBUG com.tsh.compass.intranet.dao.DbDao 18 Jun 2011 23:06:39 IST. - Column Count in Mysql table ::4 
DEBUG com.tsh.compass.intranet.dao.DbDao 18 Jun 2011 23:06:39 IST. - The Column count in both table are same 
DEBUG com.tsh.compass.intranet.dao.DbDao 18 Jun 2011 23:06:39 IST. - No of Rows of Oracle Table :: 3 
DEBUG com.tsh.compass.intranet.dao.DbDao 18 Jun 2011 23:06:39 IST. - No of Rows of Mysql Table :: 3 
Col NameFirst_Name 
Col Valuefn 
Col NameLast_Name 
Col Valueln 
Col NameAddress 
Col Valueadr 
Col NameCity 
Col Valuecity 
primaryKeyInifn$ln 
oraRowDetailsMap inside loop{Address=adr, Last_Name=ln, First_Name=fn, City=city} 
Col NameFirst_Name 
Col Valuefn1 
Col NameLast_Name 
Col Valueln1 
Col NameAddress 
Col Valueadr1 
Col NameCity 
Col Valuecity1 
primaryKeyInifn1$ln1 
oraRowDetailsMap inside loop{Address=adr1, Last_Name=ln1, First_Name=fn1, City=city1} 
Col NameFirst_Name 
Col Valuefn3 
Col NameLast_Name 
Col Valueln3 
Col NameAddress 
Col Valueadr3 
Col NameCity 
Col Valuecity3 
primaryKeyInifn3$ln3 
    oraRowDetailsMap inside loop{Address=adr3, Last_Name=ln3, First_Name=fn3, City=city3} 
    oraRowPrimaryMap{fn3$ln3={Address=adr3, Last_Name=ln3, First_Name=fn3,  City=city3}, fn$ln={Address=adr3, Last_Name=ln3, First_Name=fn3, City=city3}, fn1$ln1=  {Address=adr3, Last_Name=ln3, First_Name=fn3, City=city3}}

來源

2011-06-18 Joy

牆上的代碼omg –

請嘗試編碼一個簡單的例子。 – Matthias

什麼是孩子，什麼是父親哈希圖？我想這可能是mysqlRowPrimaryMap，但它不會在任何地方使用，是嗎？ – merxbj

你只需要重用的每一行相同oraRowDetailsMap。難怪你的結果一遍又一遍地重複着同一張地圖。

在結果集循環中使用Map<...> oraRowDetailsMap = new HashMap<...>();爲每行創建一個新映射，而不是在循環之前創建一個新映射。

來源

2011-06-18 19:26:13

感謝PaŭloEbermann.That解決了它。 – Joy

將哈希映射放入另一個集合中的問題

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