MySQL 选择在 PHP/HTML 中显示不正确
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>
由于某种原因显示为:
<html><head></head><body>
<a href="Resource id #6"><img src="Resource id #7"></a>
</body></html>
有人知道哪里出了问题吗？
忘记添加 MYSQL_connection.php 的代码，以下代码是该文件中用于连接到数据库的所有内容。
<?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;
}
}
}
?>
最佳答案
使用您自定义的 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);
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，应该更新以使用更新的 php 方法/库。
关于php - 如何在 PHP/HTML 中显示 MySQL select 语句，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/14553232/