Question

$con = mysql_connect("localhost","username","password","db name") or die('not connected');
echo "connected";

$sql = "SELECT id, first_name, last_name FROM reg-users";
$result = $conn->query($sql);

if ($result->num_rows > 0) {
// output data of each row
    while($row = $result->fetch_assoc()) {
        echo "id: " . $row["id"]. " - Name: " . $row["first_name"]. " " . $row["last_name"]. "<br>";
    }
}
else 
{
    echo "0 results";
}

我使用了上面的代码。但不行。 mysql选择查询不起作用。请给我解决方案。

Answer 1

在代码中进行以下更改：

将mysql_connect（）替换为mysqli_connect（）
替换行$ result = $ conn-＆gt;查询（$ sql）; with $ result = $ con＆gt; query（$ sql）; ＆lt;＆lt; - 请注意$ con

您的代码应为：

$con = mysqli_connect("localhost","username","password","db name") or die('not connected');
echo "connected";

$sql = "SELECT id, first_name, last_name FROM reg-users";
$result = $con->query($sql); // <<-- please note spelling mistake in $con

if ($result->num_rows > 0) {
// output data of each row
    while($row = $result->fetch_assoc()) {
        echo "id: " . $row["id"]. " - Name: " . $row["first_name"]. " " . $row["last_name"]. "<br>";
    }
}
else 
{
    echo "0 results";
}

Answer 2

更改以下代码行

$result = $conn->query($sql);

与

$result = $con->query($sql);

因为你有$ con作为mysql连接对象。

并尝试从http://www.tutorialspoint.com/

学习基本选择查询

mysql_ *没有连接到DB

2 个答案: