我正在尝试从mysql数据库中选择一个SINGLE值。我已经在phpmyadmin中运行了查询，它工作得很好。但是当我回声$result时，我什么也得不到......顺便说一句，对于数据库和密码，我使用 xxx，因为我不想显示它......我的插入查询效果很好
谢谢
<?php
//Create Connection
$servername = "localhost";
$username = "root";
$password = "xxx";
$dbname = "xxx";
//Connect
$conn = new mysqli($servername, $username, $password, $dbname);
// Check connection
if ($conn->connect_error) {
die("Connection failed: " . $conn->connect_error);
}
$sql = "SELECT StartPriceUnder FROM YJ_Value";
$result = $conn->query($sql);
echo hi;
echo $result;
echo ya;
$conn->close();
?>
试试这个：
<?php
$servername = "localhost";
$username = "root";
$password = "xxx";
$dbname = "xxx";
// Create connection
$conn = new mysqli($servername, $username, $password, $dbname);
// Check connection
if ($conn->connect_error) {
die("Connection failed: " . $conn->connect_error);
}
$sql = "SELECT StartPriceUnder FROM YJ_Value";
$result = $conn->query($sql);
if ($result->num_rows > 0) {
// output data of each row
while($row = $result->fetch_assoc()) {
echo "StartPriceUnder:" . $row["StartPriceUnder"];
}
}
else {
echo "0 results";
}
$conn->close();
?>
你必须获取你的结果，所以做这样的事情：
$row = $result->fetch_array(MYSQLI_ASSOC);
在此之后，您可以像这样回显它：
echo $row["StartPriceUnder"];
有关fetch_array()的更多信息，请参阅手册：http://php.net/manual/en/mysqli-result.fetch-array.php