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>
<? }?>
如何获得以下输出:
Ename Sal
tom 100
200
bill 100
250
450
400
最佳答案
抱歉我的英语不好: 在这里我已经回答了这个问题How to show data from database with dynamic rowspan .让我再次尝试回答这个问题。首先让我们处理 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tom记录之后,bills记录都会存在。例如进行以下插入。
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;
结果:
+-------+------+
| ename | sal |
+-------+------+
| tom | 100 |
| bill | 450 |
| bill | 100 |
| tom | 200 |
| bill | 250 |
| bill | 400 |
| James | 50 |
+-------+------+
因此您的 mysql 查询应该按名称排序。这里也应该订购每个人的sal。所以我们的查询:
SELECT * FROM emp ORDER BY ename, sal;
编码:
- 我们可以将整个任务分为 3 个部分。
- Mysql 数据获取和存储在数组中。
- 计算行跨度
- 打印
MySql 数据获取:
在从 mysql 服务器获取数据期间,我们应该始终尝试使用 mysql_fetch_assoc 函数而不是 mysql_fetch_array 。因为 mysql_fetch_assoc 将只返回 ename 和 sal。但是 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']);
}
计算行跨度:
# 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;
}
当您打印 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:
现在我们可以将rowspan计算和mysql数据抓取结合起来了。因为在将获取的数据保存在数组中的过程中,我们可以计算行跨度。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:
关于php - 从数据库中获取记录时的动态行跨度,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/6173455/