从数据库中获取记录时的动态行数

时间：2011-05-30 07:34:14

标签： php mysql 

Ename   Sal      
tom     100
tom     200
bill    100
bill    250
bill    450
bill    400

这是给出上述输出的查询和html结构。

<?php 
$sql = "select * from emp ";
$result= mysql_query($sql);
while($row=mysql_fetch_array($result))
{
  <tr >
    <td rowspan=""  ><?php echo $row['ename']; ?></td>
    <td><?php echo $row['esal']?></td>
  </tr>
  <? }?>

我如何获得以下输出：

Ename   Sal      
tom     100
        200
bill    100
        250
        450
        400

4 个答案:

答案 0 :(得分：7)

抱歉我的英语不好： 我在这里回答了这个问题How to show data from database with dynamic rowspan。让我再次尝试回答这个问题。首先，以免我们处理mysql查询。

MySql工作：

在mysql查询中，您没有查询order by。因为在现实生活中，你不能指望毕竟汤姆的记录，账单记录会在那里。例如，请进行以下插入。

INSERT INTO test_work(ename, sal) 
               VALUES("tom",  100), 
                     ("bill", 450), 
                     ("bill", 100), 
                     ("tom",  200),
                     ("bill", 250),
                     ("bill", 400),
                     ("James", 50);
SELECT * FROM test_work;

<强>结果： 

+-------+------+
| ename | sal  |
+-------+------+
| tom   |  100 |
| bill  |  450 |
| bill  |  100 |
| tom   |  200 |
| bill  |  250 |
| bill  |  400 |
| James |   50 |
+-------+------+

所以你的mysql查询应该是ename命令。这里也应该是每个人的 sal 。所以我们的查询：

SELECT * FROM emp ORDER BY ename, sal;

<强> CODING：

  1. 我们可以将整个任务分为3个部分。
    1. Mysql数据获取和存储在数组中。
    2. 计算rowspan
    3. 打印

    2. MySql Datafetching：

    在从mysql服务器获取数据期间，我们总是应该尝试使用mysql_fetch_assoc函数而不是mysql_fetch_array。因为mysql_fetch_assoc只返回ename和sal。但mysql_fetch_array将返回索引为ename，sal，0,1的数组。

        # connect to mysql server
    # and select the database, on which
    # we will work.
    $conn = mysql_connect('', 'root', '');
    $db   = mysql_select_db('test');

    # Query the data from database.
    $query  = 'SELECT * FROM test_work ORDER BY ename, sal';
    $result = mysql_query($query);

    # Intialize the array, which will 
    # store the fetched data.
    $sal = array();
    $emp = array();

    # Loop over all the fetched data, and save the
    # data in array.
    while($row = mysql_fetch_assoc($result)) {
        array_push($emp, $row['ename']);
        array_push($sal, $row['sal']);
    }

    计算行间距： 

        # Intialize the array, which will store the 
    # rowspan for the user.
    $arr = array();

    # loop over all the sal array
    for ($i = 0; $i < sizeof($sal); $i++) {
        $empName = $emp[$i];

        # If there is no array for the employee
        # then create a elemnt.
        if (!isset($arr[$empName])) {
            $arr[$empName] = array();
            $arr[$empName]['rowspan'] = 0;
        }

        $arr[$empName]['printed'] = "no";

        # Increment the row span value.
        $arr[$empName]['rowspan'] += 1;
    }

    当你将print_r arr数组时，输出将是：

    Array
(
    [bill] => Array
        (
            [rowspan] => 4
            [printed] => no
        )

    [James] => Array
        (
            [rowspan] => 1
            [printed] => no
        )

    [tom] => Array
        (
            [rowspan] => 2
            [printed] => no
        )

)

    使用rowspan打印： 

        echo "<table cellspacing='0' cellpadding='0'>
            <tr>
                <th>Ename</th>
                <th>Sal</th>
            </tr>";


    for($i=0; $i < sizeof($sal); $i++) {
        $empName = $emp[$i];
        echo "<tr>";

        # If this row is not printed then print.
        # and make the printed value to "yes", so that
        # next time it will not printed.
        if ($arr[$empName]['printed'] == 'no') {
            echo "<td rowspan='".$arr[$empName]['rowspan']."'>".$empName."</td>";
            $arr[$empName]['printed'] = 'yes';
        }
        echo "<td>".$sal[$i]."</td>";
        echo "</tr>";
    }
    echo "</table>";

    代码优化：

    现在我们可以结合rowspan计算和mysql数据获取。因为在数组中保存获取的数据时，我们可以计算行数。所以我们的最终代码：

    <!DOCTYPE html>
<html>
    <head>
        <style>
            table tr td, table tr th{
                border: black 1px solid;
                padding: 5px;
            }
        </style>
    </head>
    <body>
        <?php
        # connect to mysql server
        # and select the database, on which
        # we will work.
        $conn = mysql_connect('', 'root', '');
        $db   = mysql_select_db('test');

        # Query the data from database.
        $query  = 'SELECT * FROM test_work ORDER BY ename, sal';
        $result = mysql_query($query);

        # $arr is array which will be help ful during 
        # printing
        $arr = array();

        # Intialize the array, which will 
        # store the fetched data.
        $sal = array();
        $emp = array();

        #%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%#
        #     data saving and rowspan calculation        #
        #%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%#

        # Loop over all the fetched data, and save the
        # data.
        while($row = mysql_fetch_assoc($result)) {
            array_push($emp, $row['ename']);
            array_push($sal, $row['sal']);

            if (!isset($arr[$row['ename']])) {
                $arr[$row['ename']]['rowspan'] = 0;
            }
            $arr[$row['ename']]['printed'] = 'no';
            $arr[$row['ename']]['rowspan'] += 1;
        }


        #%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
        #        DATA PRINTING             #
        #%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%#
        echo "<table cellspacing='0' cellpadding='0'>
                <tr>
                    <th>Ename</th>
                    <th>Sal</th>
                </tr>";


        for($i=0; $i < sizeof($sal); $i++) {
            $empName = $emp[$i];
            echo "<tr>";

            # If this row is not printed then print.
            # and make the printed value to "yes", so that
            # next time it will not printed.
            if ($arr[$empName]['printed'] == 'no') {
                echo "<td rowspan='".$arr[$empName]['rowspan']."'>".$empName."</td>";
                $arr[$empName]['printed'] = 'yes';
            }
            echo "<td>".$sal[$i]."</td>";
            echo "</tr>";
        }
        echo "</table>";
        ?>
    </body>
</html>

    结果：

    a busy cat

答案 1 :(得分：0)

这样的东西？

While data
 echo
   <tr>
        <td rowspan="3"><p>numbers</p></td>
        <td><p>1</p></td>
        <td><p>2</p></td>
 </tr>

请发布您的代码

答案 2 :(得分：0)

您可以使用最后一行和当前行检查此类情况。

$sql = "select * from emp";
$result= mysql_query($sql);
echo "<table>";
while($row=mysql_fetch_array($result))
{ 
  $now=$row[0];
  if($last!=$now) {
  echo "<tr><td>$row['ename']</td><td>$row['esal']</td></tr>";
  }else{
  echo "<tr><td>&nbsp;</td><td>$row['esal']</td></tr>";
  }
  $last = $row[0];
 }
echo "</table>";

我希望这会对你有所帮助。

答案 3 :(得分：0)

应该是这样的

<?php 
    $sql = "SELECT * FROM emp ";
    $result= mysql_query($sql);
    while($row=mysql_fetch_array($result)):
      $ename = $row['ename'];

      // count the esal in each ename
      $sql2 = "SELECT * FROM emp WHERE ename=$ename";
      $result2 = mysql_query($sql2);
      $count_result2 = mysql_num_rows($result2);

    ?>
      <tr >
        <td rowspan="<?php echo $count_result2; ?>"><?php echo $row['ename']; ?></td>
        <?php
          // loop each esal
          while($row2 = mysql_fetch_array($result2)):
          ?>
              <td><?php echo $row['esal']; ?></td>
            </tr>
          <?php
          endwhile; // endwhile for each esal looping
    endwhile; // endwhile for the main looping
    ?>
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