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我看到有很多关于类似问题的其他类似帖子,但其中没有一个解决了我的问题。MySQL查询在PHP中使用时返回空结果,但在MySQL客户端中完美工作
我有以下PHP文件:
<?php
$servername = "localhost";
$username = "myusername";
$password = "mypassword";
// Create connection
$conn = mysqli_connect($servername, $username, $password);
// Check connection
if (!$conn) {
die("Connection failed: " . mysqli_connect_error());
}
echo "Connected successfully";
$sql = "SELECT DISTINCT fase FROM tornei WHERE categoria='18' AND edizione='4' AND anno='2015'";
$result = mysqli_query($conn, $sql);
if (mysqli_num_rows($result) > 0) {
// output data of each row
while($row = mysqli_fetch_assoc($result)) {
echo "fase: " . $row["fase"];
}
} else {
echo "0 results";
}
mysqli_close($conn);
?>
当一个MySQL客户端上执行的查询正确返回预期的结果:
+--------+
| fase |
+--------+
| gironi |
+--------+
在日志中,我得到以下错误:
PHP Warning: mysqli_num_rows() expects parameter 1 to be mysqli_result, boolean given in /home/admin/domains/domain.com/public_html/query.php on line 18
你应该叫mysqli_error()调用查询后,看看是否有你的语句或数据库连接错误,不开 – Jens
试着看一下mysqli_error的'输出($ conn)'看看是否对任何问题有所暗示。 –