[英]How to display MySQL select statements in PHP / HTML
The MySQL selects are not displaying properly in the PHP / HTML MySQL选择未在PHP / HTML中正确显示
This is my code: 这是我的代码:
<?php
session_start();
require_once("database.php");
require_once("MySQL_connection.php");
/* Database connection */
$db = new MySQLConnection($config['sql_host'], $config['sql_username'], $config['sql_password'], $config['sql_database']);
$db->Connect();
unset($config['sql_password']);
/* Cron */
require_once("cron.php");
/* Display Advert */
$ad_link = $db->Query("SELECT `site_url` FROM `adverts` WHERE `zone`=1 AND `days`>0 ORDER BY RAND() LIMIT 0,1;");
$img_link = $db->Query("SELECT `image_url` FROM `adverts` WHERE `zone`=1 AND `days`>0 ORDER BY RAND() LIMIT 0,1;");
?>
<!DOCTYPE html>
<html>
<body>
<a href="<?php echo $ad_link ?>"><img src="<? echo $img_link ?>"></a>
</body>
</html>
For some reason that is displaying as: 由于某些原因显示为:
<html><head></head><body>
<a href="Resource id #6"><img src="Resource id #7"></a>
</body></html>
Is anybody know what is wrong? 有人知道怎么了吗?
Forgot to add the code for MYSQL_connection.php, the following code is everything within that file that is used to connect to the DB. 忘记添加MYSQL_connection.php的代码,以下代码就是该文件中用于连接数据库的所有内容。
<?php
class MySQLConnection {
private $sqlHost;
private $sqlUser;
private $sqlPassword;
private $sqlDatabase;
private $mySqlLinkIdentifier = FALSE;
public $QueryFetchArrayTemp = array();
private $numQueries = 0;
public $UsedTime = 0;
public function __construct($sqlHost, $sqlUser, $sqlPassword, $sqlDatabase = FALSE) {
$this->sqlHost = $sqlHost;
$this->sqlUser = $sqlUser;
$this->sqlPassword = $sqlPassword;
$this->sqlDatabase = $sqlDatabase;
}
public function __destruct() {
$this->Close();
}
public function Connect() {
if($this->mySqlLinkIdentifier !== FALSE) {
return $this->mySqlLinkIdentifier;
}
$this->mySqlLinkIdentifier = mysql_connect($this->sqlHost, $this->sqlUser, $this->sqlPassword, TRUE); // Open new link on every call
if($this->mySqlLinkIdentifier === FALSE) {
return FALSE;
}
if($this->sqlDatabase !== FALSE) {
mysql_select_db($this->sqlDatabase, $this->mySqlLinkIdentifier);
}
return $this->mySqlLinkIdentifier;
}
public function Close() {
if($this->mySqlLinkIdentifier !== FALSE) {
mysql_close($this->mySqlLinkIdentifier);
$this->mySqlLinkIdentifier = FALSE;
}
}
public function GetLinkIdentifier() {
return $this->mySqlLinkIdentifier;
}
public function Query($query) {
$start = microtime(true);
$result = mysql_query($query, $this->GetLinkIdentifier());
$this->UsedTime += microtime(true) - $start;
$this->numQueries++;
if( $result === false ){
die($this->GetErrorMessage());
}
return $result;
}
public function FreeResult($result) {
mysql_free_result($result);
}
public function FetchArray($result) {
return mysql_fetch_array($result, MYSQL_ASSOC);
}
public function FetchArrayAll($result){
$retval = array();
if($this->GetNumRows($result)) {
while($row = $this->FetchArray($result)) {
$retval[] = $row;
}
}
return $retval;
}
public function GetNumRows($result) {
return mysql_num_rows($result);
}
public function GetNumAffectedRows() {
return mysql_affected_rows($this->mySqlLinkIdentifier);
}
// Helper methods
public function QueryFetchArrayAll($query) {
$result = $this->Query($query);
if($result === FALSE) {
return FALSE;
}
$retval = $this->FetchArrayAll($result);
$this->FreeResult($result);
return $retval;
}
public function QueryFirstRow($query) {
$result = $this->Query($query);
if($result === FALSE) {
return FALSE;
}
$retval = FALSE;
$row = $this->FetchArray($result);
if($row !== FALSE) {
$retval = $row;
}
$this->FreeResult($result);
return $retval;
}
public function QueryFirstValue($query) {
$row = $this->QueryFirstRow($query);
if($row === FALSE) {
return FALSE;
}
return $row[0];
}
public function GetErrorMessage() {
return "SQL Error: ".mysql_error().": ";
}
public function EscapeString($string) {
if (is_array($string))
{
$str = array();
foreach ($string as $key => $value)
{
$str[$key] = $this->EscapeString($value);
}
return $str;
}
return get_magic_quotes_gpc() ? $string : mysql_real_escape_string($string, $this->mySqlLinkIdentifier);
}
function GetNumberOfQueries() {
return $this->numQueries;
}
public function BeginTransaction() {
$this->Query("SET AUTOCOMMIT=0");
$this->Query("BEGIN");
}
public function CommitTransaction() {
$this->Query("COMMIT");
$this->Query("SET AUTOCOMMIT=1");
}
public function RollbackTransaction() {
$this->Query("ROLLBACK");
$this->Query("SET AUTOCOMMIT=1");
}
public function GetFoundRows() {
return $this->QueryFirstValue("SELECT FOUND_ROWS()");
}
public function GetLastInsertId() {
return $this->QueryFirstValue("SELECT LAST_INSERT_ID()");
}
public function QueryFetchArray($query, $all = false, $useCache = true)
{
$tempKey = sha1($query . ($all === true ? 'all' : 'notAll'));
$temp = $this->QueryFetchArrayTemp[$tempKey];
if ($temp && $useCache === true)
{
return unserialize($temp);
}
else
{
$queryResult = $this->Query($query);
$result = $all === true ? $this->FetchArrayAll($queryResult) : $this->FetchArray($queryResult);
$this->QueryFetchArrayTemp[$tempKey] = serialize($result);
return $result;
}
}
}
?>
您正在使用一些自定义的MySQL包装器,但是您可能应该使用mysql_result()
, mysql_fetch_array()
或类似方法从查询中获取结果。
You would do well to read up on mysqli
, which is a safer way to carry out MySQL queries. 您最好阅读mysqli
,这是执行MySQL查询的一种更安全的方法。 You can find the excellent documentation here: http://php.net/manual/en/book.mysqli.php and there is also a very useful tutorial here which covers simple queries like yours: http://www.phphaven.com/article.php?id=65 您可以在这里找到出色的文档: http : //php.net/manual/en/book.mysqli.php ,这里还有一个非常有用的教程,其中涵盖了像您这样的简单查询: http : //www.phphaven.com /article.php?id=65
For your specific question, I would use the following: 对于您的特定问题,我将使用以下内容:
$query = "SELECT `site_url`,`image_url` FROM `adverts` WHERE `zone`=1 AND `days`>0 ORDER BY RAND() LIMIT 0,1;";
$result = $mysqli->query($query) or die($mysqli->error.__LINE__);
if($result->num_rows > 0) {
while($row = $result->fetch_assoc()) {
// I've split these lines up to make them a little more readable.
echo '<a href="';
echo $row['site_url'];
echo '">';
echo '<img src="';
echo $row['image_url'];
echo '"</img></a>';
}
}
else {
echo 'NO RESULTS';
}
I hope this helps. 我希望这有帮助。
Using your custom MySQL class, this will probably work: 使用您的自定义MySQL类,这可能会起作用:
$result = $db->Query("SELECT `site_url`,`image_url` FROM `adverts` WHERE `zone`=1 AND `days`>0 ORDER BY RAND() LIMIT 0,1;");
while($row = $db->FetchArray($result)) {
echo '<a href="' . $row['site_url'] . '"><img src="' . $row['image_url'] . '"></a>';
}
$db->FreeResult($result);
However, as others have pointed out, the code used in your custom MySQL class is deprecated and should be updated to use newer php methods/libraries. 但是,正如其他人指出的那样,您的自定义MySQL类中使用的代码已被弃用,应更新为使用较新的php方法/库。
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