MySQL查询未插入值

Question

我尝试将一些来自帖子值的值插入到我的数据库中，但它不起作用。从1个帖子中仅尝试了1个值，它就可以正常工作，不适用于多个帖子。 没有错误，没什么:(

http://prntscr.com/67e1qd

码：

$rowSQL = mysql_query( "SELECT MAX( id ) AS max FROM `topic`;" );
$row = mysql_fetch_array( $rowSQL );
$largestNumber = $row['max'];

$new_id = ++$largestNumber;

$newnumber = mysql_query("INSERT INTO topic SET id = '".$new_id."'");

if (isset($_POST['submit']) && strlen($_POST['nome'])!== 0 && strlen($_POST['desc'])!== 0 && strlen($_POST['link'])!== 0){

    $nome = mysql_real_escape_string($_POST['nome']);
    $desc = mysql_real_escape_string($_POST['desc']);
    $link = mysql_real_escape_string($_POST['link']);
    $insert = ("INSERT INTO topic SET nome = '".$nome."', `desc` = '".$desc."', `link` = '".$link."' WHERE id = '".$newnumber."'") or die(mysql_error());
    $run = mysql_query($insert);
    if($run) { echo '<span style="color:#AFA;text-align:center;margin:8px;">Sucesso!</span>'; } else { echo '<span style="color:#DC143C;text-align:center;margin:8px;">Ocorreu um erro.Tenta novamente.</span>'; }
}else{
    echo "Campos não foram preenchidos.";
}

Answer 1

试试这个，并发布您所得到的：

$rowSQL = mysql_query( "SELECT MAX( id ) AS max FROM `topic`;" );
$row = mysql_fetch_array( $rowSQL );
$largestNumber = $row['max'];

$new_id = ++$largestNumber;

$newnumber = mysql_query("INSERT INTO topic SET id = '".$new_id."'");

if (isset($_POST['submit']) && strlen($_POST['nome'])!== 0 && strlen($_POST['desc'])!== 0 && strlen($_POST['link'])!== 0){

    $nome = mysql_real_escape_string($_POST['nome']);
    $desc = mysql_real_escape_string($_POST['desc']);
    $link = mysql_real_escape_string($_POST['link']);
    $insert = "INSERT INTO topic SET nome = '".$nome."', `desc` = '".$desc."', `link` = '".$link."' WHERE id = '".$newnumber."'";
    echo $insert;
    $run = mysql_query($insert) or die(mysql_error());
    if($run) { echo '<span style="color:#AFA;text-align:center;margin:8px;">Sucesso!</span>'; } else { echo '<span style="color:#DC143C;text-align:center;margin:8px;">Ocorreu um erro.Tenta novamente.</span>'; }
}else{
    echo "Campos não foram preenchidos.";
}

编辑：

如果要插入一些数据，那么为什么要在其中放置where子句？

EDIT2：

$update = "UPDATE topic SET nome = '".$nome."', `desc` = '".$desc."', `link` = '".$link."' WHERE id = '".$newnumber."'";

$run = mysql_query($update) or die(mysql_error());

EDIT3：

$rowSQL = mysql_query( "SELECT MAX( id ) AS max FROM `topic`;" );
$row = mysql_fetch_array( $rowSQL );
$largestNumber = $row['max'];

$new_id = ++$largestNumber;

if (isset($_POST['submit']) && strlen($_POST['nome'])!== 0 && strlen($_POST['desc'])!== 0 && strlen($_POST['link'])!== 0){

    $nome = mysql_real_escape_string($_POST['nome']);
    $desc = mysql_real_escape_string($_POST['desc']);
    $link = mysql_real_escape_string($_POST['link']);
    mysql_query("INSERT INTO topic SET id = '".$new_id."', nome = '".$nome."', `desc` = '".$desc."', `link` = '".$link."'") or die(mysql_error());
    if($run) { echo '<span style="color:#AFA;text-align:center;margin:8px;">Sucesso!</span>'; } else { echo '<span style="color:#DC143C;text-align:center;margin:8px;">Ocorreu um erro.Tenta novamente.</span>'; }
}else{
    echo "Campos não foram preenchidos.";
}

Answer 2

看起来您正在编写代码来增加数据库中行的ID，这时您可以让MySQL自行处理。 如果在id字段上将AUTO INCREMENT设置为true，那么您需要做的只是以下几点；

// Validate your POST inputs
if (isset($_POST['submit']) && strlen($_POST['nome'])!== 0 && strlen($_POST['desc'])!== 0 && strlen($_POST['link'])!== 0){

$nome = mysql_real_escape_string($_POST['nome']);
$desc = mysql_real_escape_string($_POST['desc']);
$link = mysql_real_escape_string($_POST['link']);

$insert = "INSERT INTO topic (nome, desc, link) VALUES ('".$nome."', '".$desc."', '".$link."')";
echo $insert;
$run = mysql_query($insert) or die(mysql_error());
if($run) { echo '<span style="color:#AFA;text-align:center;margin:8px;">Sucesso!</span>'; } else { echo '<span style="color:#DC143C;text-align:center;margin:8px;">Ocorreu um erro.Tenta novamente.</span>'; }
}else{
echo "Campos não foram preenchidos.";
}

如果将id字段设置为AUTO INCREMENT，则id会自动将其自身设置为列表中的下一个数字

Answer 3

试试这个：

$rowSQL = mysql_query( "SELECT MAX( id ) AS max FROM `topic`;" );
$row = mysql_fetch_array( $rowSQL );
$largestNumber = $row['max'];

$new_id = ++$largestNumber;

$newnumber = mysql_query("INSERT INTO topic SET id = '".$new_id."'");
$newnumberid = mysql_query("SELECT id FROM topic WHERE id = '".$new_id."'");

if (isset($_POST['submit']) && strlen($_POST['nome'])!== 0 && strlen($_POST['desc'])!== 0 && strlen($_POST['link'])!== 0){

$nome = mysql_real_escape_string($_POST['nome']);
$desc = mysql_real_escape_string($_POST['desc']);
$link = mysql_real_escape_string($_POST['link']);
$insert = "UPDATE topic(nome,desc,link) SET nome = '".$nome."', `desc` = '".$desc."', `link` = '".$link."' WHERE id = '".$newnumberid."'";
echo $insert;
$run = mysql_query($insert) or die(mysql_error());
if($run) { echo '<span style="color:#AFA;text-align:center;margin:8px;">Sucesso!</span>'; } else { echo '<span style="color:#DC143C;text-align:center;margin:8px;">Ocorreu um erro.Tenta novamente.</span>'; }
}else{
echo "Campos não foram preenchidos.";
}