獲取受影響的行

我試圖讓這個查詢SELECT mac, stop_name from behaviour where mac = ?與使用executeQuery的受影響的記錄數的數量。我怎樣才能得到受影響的行數？獲取受影響的行

代碼：

if (behaviourExist.next()) { 
    PreparedStatement prepared = con 
      .prepareStatement("SELECT mac, stop_name from behaviour where mac = ?"); 
    prepared.setString(1, macD); 
    ResultSet rsBehav = prepared.executeQuery(); 
    ArrayList<String> stopNameList = new ArrayList<String>(); 
    while (rsBehav.next()) { 
     //int numberOfRows = rsBehav.getInt(1); 
     String stNa = rsBehav.getString("stop_name"); 
     if (stNa.equals(nameShortestDistance)) { 
      stopNameList.add(stNa); 

     } 

    } 
}

來源

2015-06-21 Mr Asker

http://www.coderanch.com/t/303346/JDBC/databases/find-number-rows-resultset – Pshemo

甲選擇不具有數受影響的行（==添加，更新或刪除）。 –

這是一個讀操作，這樣就不會影響任何行。如果你想獲得行返回的數字，那麼你可以做的一個低於

使用計數器變量，在環加一while (rsBehav.next())

使用可滾動的ResultSet

PreparedStatement prepared = con.prepareStatement(
     "SELECT mac, stop_name from behaviour where mac = ?", 
     ResultSet.TYPE_SCROLL_INSENSITIVE, ResultSet.CONCUR_READ_ONLY); 
ResultSet rsBehav = prepared.executeQuery(); 
rsBehav.afterLast(); 
int numRow = rsBehav.getRow(); 
rsBehav.beforeFirst();

這裏numRow行會給你號或者返回行，

來源

2015-06-21 08:58:01 barunsthakur

if (behaviourExist.next()) { 
PreparedStatement prepared = con 
     .prepareStatement("SELECT mac, stop_name from behaviour where mac = ?"); 
prepared.setString(1, macD); 
ResultSet rsBehav = prepared.executeQuery(); 
ArrayList<String> stopNameList = new ArrayList<String>(); 
int numberOfRows = 0; 
while (rsBehav.next()) { 
    ++numberOfRows; 
    String stNa = rsBehav.getString("stop_name"); 
    if (stNa.equals(nameShortestDistance)) { 
     stopNameList.add(stNa); 

    } 
} 
}

這裏變量numberOfRows會在每次循環運行時遞增，這會給你結果集中的總行數。

來源

2015-06-21 08:58:37 swifty

PreparedStatement prepared = con 
     .prepareStatement(
     "SELECT (SELECT count(*) from where mac = ?)," 
     " mac, stop_name from behaviour where mac = ?"); 
prepared.setString(1, macD); 
prepared.setString(2, macD); 
ResultSet rsBehav = prepared.executeQuery(); 
ArrayList<String> stopNameList = new ArrayList<String>(); 
while (rsBehav.next()) { 
    int numberOfRows = rsBehav.getInt(1); 
    String stNa = rsBehav.getString("stop_name"); 
    // ....

來源

2015-06-21 09:06:08 saka1029

獲取受影響的行

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