如何在php代碼中從數據庫的第一行檢索數據
[英]How to retrieve data from the first row from database in php code
問題描述
我編寫了這段代碼來從數據庫中檢索一些數據但是該代碼不顯示從第二行開始的表中的第一個值。 如何讓此代碼從第一行檢索數據。
<html>
<head>
<title>hello</title>
</head>
<body>
<?php
$con = mysqli_connect('localhost', 'root', '');
mysqli_select_db($con,"uoh");
$q = " SELECT * FROM student_record WHERE id =201102887;";
$result = mysqli_query($con , $q ) ;
if($row = mysqli_fetch_array($result)) {
echo "<table border=\"1\" style=\"width:500\">";
echo "<tr>";
echo "<th>courses</th>";
echo "</tr>";
while($row = mysqli_fetch_array($result))
{
echo "<tr>";
echo "<td>" . $row["grade"]. "</td>";
echo "</tr>";
}
echo "</table>";
}
?>
</body>
</html>
3 個解決方案
解決方案1
1 已采納 2016-03-19 07:03:45
改變
if($row = mysqli_fetch_array($result)) {
到
if(mysqli_num_rows($result) > 0) {
更新代碼
<html>
<head>
<title>hello</title>
</head>
<body>
<?php
$con = mysqli_connect('localhost', 'root', '');
mysqli_select_db($con,"uoh");
$q = " SELECT * FROM student_record WHERE id =201102887;";
$result = mysqli_query($con , $q ) ;
if(mysqli_num_rows($result)>0) {
echo "<table border=\"1\" style=\"width:500\">";
echo "<tr>";
echo "<th>courses</th>";
echo "</tr>";
while($row = mysqli_fetch_array($result))
{
echo "<tr>";
echo "<td>" . $row["grade"]. "</td>";
echo "</tr>";
}
echo "</table>";
}
?>
</body>
</html>
解決方案2
0 2016-03-19 07:03:06
您正在調用 mysqli_fetch_array 兩次，第二次調用將轉到第二行。 像這樣嘗試
<html>
<head>
<title>hello</title>
</head>
<body>
<?php
$con = mysqli_connect('localhost', 'root', '');
mysqli_select_db($con,"uoh");
$q = " SELECT * FROM student_record WHERE id =201102887;";
$result = mysqli_query($con , $q ) ;
$rows = array();
while($row = mysqli_fetch_array($result))
{
$rows[] = $row;
}
if(count($rows) > 0) {
echo "<table border=\"1\" style=\"width:500\">";
echo "<tr>";
echo "<th>courses</th>";
echo "</tr>";
foreach($rows as $row)
{
echo "<tr>";
echo "<td>" . $row["grade"]. "</td>";
echo "</tr>";
}
echo "</table>";
}
?>
</body>
</html>
解決方案3
0 2016-03-19 07:06:37
據我所知，當你打電話兩次時，
if($row = mysqli_fetch_array($result)) {
那么當您在循環中再次調用它時，第一行將跳過，您創建if($row = mysqli_fetch_array($result)) {什么？ 如果您只想檢查查詢返回，您可以使用if($result) {
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