我正在尝试检查是否有今天的条目，如果没有，则添加一个条目，如果已经存在则不存在。当前代码是：
$conn = new mysqli($servername, $username, $password, $dbname);
if ($conn->connect_error) {
die("Connection failed: " . $conn->connect_error);
}
$sql .= "SELECT plusamount AS plustotal, minusamount AS minustotal FROM Juuli WHERE reg_date >= CURRENT_DATE() ORDER BY id DESC";
$result = $conn->query($sql);
if ($result->num_rows > 0) {
echo "It already exists!";
} else {
echo "autowrite should run";
$sql .= "INSERT INTO Juuli(minusamount) VALUES (0); ";
}
$conn->close();
?>
如果您的SELECT语句以您希望直接从数据库中使用的方式工作，则以下内容应该起作用。（注意替换.=用=）
$sql = "SELECT plusamount AS plustotal, minusamount AS minustotal FROM Juuli WHERE reg_date >= CURRENT_DATE() ORDER BY id DESC";
$result = $conn->query($sql);
if ($result->num_rows > 0) {
echo "It already exists!";
} else {
echo "autowrite should run";
$sql2 = "INSERT INTO Juuli (minusamount) VALUES (0)";
$result2 = $conn->query($sql2);
}
$conn->close();
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