Question

<?php
session_start();
ob_start();
$host="localhost"; // Host name 
$username="*"; // Mysql username 
$password="*"; // Mysql password 
$db_name="vragenlijst"; // Database name 
$tbl_name="leerlingen"; // Table name 

// Connect to server and select databse.
mysql_connect("$host", "$username", "$password")or die("cannot connect"); 
mysql_select_db("$db_name")or die("cannot select DB");

// Define $myusername and $mypassword 
$myusername=$_POST['myusername']; 
$mypassword=$_POST['mypassword']; 

// To protect MySQL injection (more detail about MySQL injection)
$myusername = stripslashes($myusername);
$mypassword = stripslashes($mypassword);
$myusername = mysql_real_escape_string($myusername);
$mypassword = mysql_real_escape_string($mypassword);
$sql="SELECT * FROM $tbl_name WHERE gebruikersnaam='$myusername' and wachtwoord='$mypassword'";
$result=mysql_query($sql);
$sql1="SELECT * FROM leerlingen WHERE gebruikersnaam='$myusername' and wachtwoord='$mypassword'";
$geslacht=mysql_query($sql1);
$row = mysql_fetch_array($geslacht);
echo $geslacht['leraar'];

// Mysql_num_row is counting table row
$count=mysql_num_rows($result);

// If result matched $myusername and $mypassword, table row must be 1 row
if($count==1){

// Register $myusername, $mypassword and redirect to file "login_success.php"
$_SESSION["myusername"] = $myusername;
$_SESSION["mypassword"] = $mypassword; 
/*if($geslacht = 'm') {
    header("location:vragen2m.html");
} else {
    header("location:vragen2v.html");   
}
*/
}
else {
echo "Verkeerde gebruikersnaam of wachtwoord";
}
ob_end_flush();
?>

mysql表'leerlingen'包含一个名为'geslacht'的列。 'geslacht'包含值'm'或值'v'。我知道'mysql_query（$ sql1）'命令返回数据，这些值存储在数组中。当我回显查看查询结果时，php代码返回错误消息“资源ID＃4”。我尝试了几种提取数据的方法，但每次我们收到错误消息或只是一个空白页面。提前谢谢！

Answer 1

你这样做了：

$row = mysql_fetch_array($geslacht);
echo $geslacht['leraar']; // this is the error because $geslacht is your resource and not your array

$geslacht //是您的资源

$row //是您的数组

您可以print_r($row);输出数组。

如果你的数组有一个名为leraar的字段，你可以echo $row['leraar'];。

如何从mysql表中获取数据？

1 个答案: