PHP文件无法输入部分代码

Question

这是我的 php 文件中的一个函数，用于服务我的 Android 应用程序的请求。

function checkin($DB, $TechID, $ClientID, $SiteID){
    $dbConnection = mysql_connect($DB['server'], $DB['loginName'], $DB['password']);
    if(!$dbConnection){
        die('Error! ' . mysql_error());
        }
    mysql_select_db($DB['database'], $dbConnection);

    $file2 = "C:/wamp/www/file2.txt";
    $data2 = "ClientID:".$ClientID." TechID:".$TechID." SiteID:".$SiteID;
    file_put_contents($file2, $data2);

    $result1 = mysql_query("SELECT COUNT(*) FROM Log") or die('Error! ' . mysql_error());
    $query = "SELECT `Type` FROM `Log` WHERE `TechID` = '".$TechID."' ORDER BY LogTime DESC LIMIT 1";
    $file5 = "C:/wamp/www/file5.txt";
    file_put_contents($file5, $query);
    $result2 = mysql_query($query) or die('Error! ' . mysql_error());
    while($row1 = mysql_fetch_array($result1)){
        $count = $row1['COUNT(*)'];
        $file3 = "C:/wamp/www/file3.txt";
        $data3 = "ClientID:".$ClientID." TechID:".$TechID." SiteID:".$SiteID." Count:".$count;
        file_put_contents($file3, $data3);
        while($row2 = mysql_fetch_array($result2)){
            $file4 = "C:/wamp/www/file4.txt";
            $data3 = "ClientID:".$ClientID." TechID:".$TechID." SiteID:".$SiteID." Count:".$count;
            file_put_contents($file4, $data3);
            /*if($row2['Type']!="Checkin"){
                $count = $count+1;
                $Time = date('Y/m/d H:i');
                mysql_query("INSERT INTO Log (LogID, TechID, ClientID, SiteID, LogTime, Type)
                            VALUES (".$count.", ".$TechID.", ".$ClientID.", ".$SiteID.", ".$Time.", Checkin)");
             }else{
                $query2 = "SELECT TechEmail FROM Tech WHERE TechID=".$TechID;
                $result3 = mysql_query($query2) or die('Error! ' . mysql_error());
                $subject = "Please check out";
                $message = "You have forgot to logout from the last site, please check out manually";
                $from = "devadmin@uniserveit.com";
                $header = "Form:".$from;
                while($row3 = mysql_fetch_array($result3)){
                    mail($row3['TechEmail'], $subject, $message, $header);
                }
            }*/
        }
    }
}

你可以看到我隐藏了一些代码，因为我正在调试它，所以我创建了一些文件只是为了看看哪部分代码无法执行。我发现程序无法进入应创建file4的区域。我发现问题可能出在 $query 上，当它执行时，有时 mysql 会响应“未知表状态:TABLE_TYPE”，我不明白为什么。

Answer 1

正如上面评论中所写，您应该分而治之，以使您的生活更轻松(尤其是当您在大型函数中使用代码时编写代码)。这确实很简单:

function file_put($number, $data)
{
    $path = sprintf("C:/temp/wamp/www/file%d.txt", $number);
    file_put_contents($path, $data);
}

例如，这只是替换许多重复的行，您只需要一个在其中放入一些字符串的(编号)文件。

但是您也可以使用更复杂的东西来完成此操作，例如数据库操作。您可能希望将错误处理移出您的视线，并在需要时注意连接到数据库，并以更灵活的方式获取数据。这可以通过将(温和地弃用的)mysql_* 函数移动到其自己的一两个类中来完成，这样它就离开了您的视线。这将使它的使用更加容易(我首先展示):

// Create your database object to use it later on:
$config = array(
    'server' => 'localhost',
    'name' => 'root',
    'password' => '',
    'db' => 'test',
);
$db = new MySql($config);

我将数据库类命名为MySql，因为它代表 mysql 连接并且可以与旧的 mysql 扩展一起使用。您只需将该数据库对象传递到问题中的函数中即可。与 file_put 函数结合，它看起来像这样:

function checkin(MySql $DB, $TechID, $ClientID, $SiteID)
{
    $query = sprintf("SELECT `Type` FROM `Log` WHERE `TechID` = '%d' ORDER BY LogTime DESC LIMIT 1", $TechID);
    file_put(5, $query);

    $result1 = $DB->query("SELECT COUNT(*) FROM Log");    
    $result2 = $DB->query($query);

    foreach ($result1 as $row1) {
        list($count) = $row1;
        $data = "ClientID:$ClientID TechID:$TechID SiteID:$SiteID Count:$count"
        file_put(3, $data);
        foreach ($result2 as $row2) {
            file_put(4, $data);
        }
    }
}

尽管如此，checkin 函数已经接近大型(已经有 12 行代码)，但比您的第一个版本短得多，因为它委托(delegate)了写入文件和访问数据库的工作。我希望这个演示有用。以下是完整的代码示例:

/**
 * MySql Exception
 */
class MySqlException extends RuntimeException
{
}

/**
 * MySql Database Class
 */
class MySql
{
    private $server;
    private $name;
    private $password;
    private $db;
    private $connection;

    public function __construct(array $config)
    {
        $this->server = $config['server'];
        $this->name = $config['name'];
        $this->password = $config['password'];
        $this->db = $config['db'];
    }

    private function connect($server, $name, $password)
    {
        $this->connection = mysql_connect($server, $name, $password);
        if (!$this->connection) {
            $this->error("Unable to connect to '%s' as user '%s'", $server, $name);
        }
    }

    private function select($db)
    {
        if (!mysql_select_db($db, $this->connection)) {
            $this->error("Unable to select database '%s'", $db);
        }
    }

    private function close()
    {
        $this->connection && mysql_close($this->connection);
    }

    private function connectSelect()
    {
        $this->connect($this->server, $this->name, $this->password);
        $this->select($this->db);
    }

    /**
     * @param $query
     * @return MySqlResult
     */
    public function query($query)
    {
        $this->connection || $this->connectSelect();
        $result = mysql_query($query, $this->connection);
        if (!$result) {
            $this->error("Unable to execute query '%s'", $query);
        }
        return new MySqlResult($result);
    }

    /**
     * @param string $format
     * @param ...
     * @throws MySqlException
     */
    private function error($format)
    {
        $args = func_get_args();
        array_shift($args);
        $format .= ': %s';
        $args[] = $this->connection ? mysql_error($this->connection) : mysql_error();
        throw new MySqlException(vsprintf($format, $args));
    }

    public function __destruct()
    {
        $this->close();
    }
}

/**
 * MySql Result Set - Array Based
 */
class MySqlResult implements Iterator, Countable
{
    private $result;
    private $index = 0;
    private $current;

    public function __construct($result)
    {
        $this->result = $result;
    }

    public function fetch($result_type = MYSQL_BOTH)
    {
        $this->current = mysql_fetch_array($this->result, $result_type);
        return $this->current;
    }

    /**
     * Return the current element
     * @link http://php.net/manual/en/iterator.current.php
     * @return array
     */
    public function current()
    {
        return $this->current;
    }

    public function next()
    {
        $this->current && $this->fetch();
    }

    /**
     * Return the key of the current element
     * @link http://php.net/manual/en/iterator.key.php
     * @return mixed scalar on success, or null on failure.
     */
    public function key()
    {
        return $this->current ? $this->index : null;
    }

    /**
     * Checks if current position is valid
     * @link http://php.net/manual/en/iterator.valid.php
     * @return boolean The return value will be casted to boolean and then evaluated.
     * Returns true on success or false on failure.
     */
    public function valid()
    {
        return (bool)$this->current;
    }

    /**
     * Rewind the Iterator to the first element
     * @link http://php.net/manual/en/iterator.rewind.php
     * @return void Any returned value is ignored.
     */
    public function rewind()
    {
        $this->fetch();
    }

    /**
     * Count of rows.
     *
     * @link http://php.net/manual/en/countable.count.php
     * @return int The count of rows as an integer.
     */
    public function count()
    {
        return mysql_num_rows($this->result);
    }
}

// Create your database object to use it later on:
$config = array(
    'server' => 'localhost',
    'name' => 'root',
    'password' => '',
    'db' => 'test',
);
$db = new MySql($config);

function file_put($number, $data)
{
    $path = sprintf("C:/temp/wamp/www/file%d.txt", $number);
    file_put_contents($path, $data);
}

function checkin(MySql $DB, $TechID, $ClientID, $SiteID)
{
    $query = sprintf("SELECT `Type` FROM `Log` WHERE `TechID` = '%d' ORDER BY LogTime DESC LIMIT 1", $TechID);
    file_put(5, $query);

    $result1 = $DB->query("SELECT COUNT(*) FROM Log");    
    $result2 = $DB->query($query);

    foreach ($result1 as $row1) {
        list($count) = $row1;
        $data = "ClientID:$ClientID TechID:$TechID SiteID:$SiteID Count:$count";
        file_put(3, $data);
        foreach ($result2 as $row2) {
            file_put(4, $data);
        }
    }
}

checkin($db, 1, 2, 3, 4);