我正在尝试扩展 PHP5 MySQLi 库
class mysqli_ls extends mysqli
我扩展该类的原因是添加默认情况下不包含的我需要的功能和特性。对于我创建的函数，我想以与处理任何本机函数完全相同的方式处理错误。
我希望使用该类的人不必确定这些功能是原生的还是定制的。
正常功能
if ($_mysqli->query($sql) === false) die($_mysqli->error);
所需的定制功能示例
if ($_mysqli->run_config() === false) 死($_mysqli->error);
班级
在我的扩展 mysqli 的类 mysqli_ls 中，我有以下函数，我希望它们能在父 mysqli 类中设置错误消息..
public function run_config()
{
// Open Debug FH
if ($this->config['debug_log'] === TRUE)
{
if ($this->fh_debug = fopen($this->config['debug_log_path'], 'a') === FALSE)
{
$this->handle_error('Could not open Debug file handle','200',__METHOD__);
return $this->E_ERROR;
}
}
}
private function handle_error($errormsg,$errorno,$method)
{
$this->errorno = $errorno;
$this->error = $errormsg;
if ($this->config['debug_log'] === TRUE)
{
$msg = "($errorno) $errormsg";
$this->write_log('error', $method, $msg);
}
return $this->E_OK;
}
我已经尝试了上面的错误方法： PHP Fatal error: mysqli_ls::handle_error(): Cannot write property
以及导致语法错误的静态调用语法，如下所示：
parent::error
parent::errorno
我希望该类的用户无缝地拥有默认的 MySQLI 功能和扩展功能，而不必使用不同的方法来识别错误。
提前感谢您提供的任何建议或意见。
编辑：添加全班
class mysqli_ls extends mysqli
{
private $config = array
(
'config_load' => FALSE,
'config_path' => 'mysqli_ls.database.ini',
'debug_log' => FALSE,
'debug_log_path' => '/tmp/mysqli_ls.debug.log',
'query_log' => FALSE,
'query_log_path' => '/tmp/mysqli_ls.debug.log',
'log_date_format' => 'Y-m-d H:i:s'
);
// Expected fields for the autoload file
private $db_fields = array('hostname','username','password','database','port');
// File Handles
private $fh_debug = FALSE;
private $fh_query = FALSE;
private $fh_config = FALSE;
// Return presets
private $E_OK = TRUE;
private $E_ERROR = FALSE;
// Existing database connections
private $db_existing = array();
public $error;
public $errorno;
## ----------
public function __construct()
{
if (!function_exists('mysqli_connect')) $this->handle_error('MySQLI is not installed','100');
}
## ----------
public function run_config()
{
// Testing error handling
$this->handle_error('Could not open Debug file handle','200',__METHOD__);
// Open Debug FH
if ($this->config['debug_log'] === TRUE)
{
if ($this->fh_debug = fopen($this->config['debug_log_path'], 'a') === FALSE)
{
$this->handle_error('Could not open Debug file handle','200',__METHOD__);
return $this->E_ERROR;
}
}
// Open Query FH
if ($this->config['query_log'] === TRUE)
{
if ($this->fh_query = fopen($this->config['query_log_path'], 'a') === FALSE)
{
$this->handle_error('Could not open Debug file handle','210');
return $this->E_ERROR;
}
}
// Load database INI file
if ($this->config['config_load'] === TRUE)
{
if ( ($this->db_existing = parse_ini_file($this->config['config_path'], TRUE)) === FALSE )
{
$this->handle_error('Could not parse the database ini file','220');
return $this->E_ERROR;
}
}
// Check for format of the loaded ini file
foreach($this->db_existing as $name => $row)
{
foreach($this->db_fields as $field)
{
if ( !isset($row[$field]) )
{
$this->handle_error("Missing field ($field) in the config array for element ($name)",'230');
return $this->E_ERROR;
}
} // END foreach
} // END foreach
return $this->E_OK;
}
## ----------
public function set_config($key, $value)
{
if ( !isset($this->config[$key]) )
{
$this->handle_error('Configuration variable ($key) does not exist','300');
return $this->E_ERROR;
}
$this->config[$key] = $value;
return $this->E_OK;
}
## ----------
public function get_config()
{
return array_merge($this->config, $this->db_existing);
}
## ----------
private function write_log($type,$method,$msg)
{
$msg = date($this->config['log_date_format']) ."\t". $type ."\t". $method ."\t". $msg ."\n";
switch($type)
{
case 'error':
fwrite($this->fh_debug, $msg);
break;
case 'debug':
fwrite($this->fh_debug, $msg);
break;
case 'query':
fwrite($this->fh_query, $msg);
break;
default:
return $this->E_ERROR;
break;
}
}
## ----------
private function handle_error($errormsg,$errorno,$method)
{
$this->errorno = $errorno;
$this->error = $errormsg;
if ($this->config['debug_log'] === TRUE)
{
$msg = "($errorno) $errormsg";
$this->write_log('error', $method, $msg);
}
return $this->E_OK;
}
## ----------
## ----------
## ----------
## ----------
} // END Class
调用类的测试脚本
#!/usr/bin/php
<?php
require('mysqli_ls.class.php');
try
{
$_mysqli = new mysqli_ls;
}
catch (Exception $e)
{
print "\n\n". $e->getMessage() ."\n\n";
print_r($e);
}
$_mysqli->set_config('debug_log',TRUE);
$_mysqli->set_config('query_log',TRUE);
$_mysqli->set_config('config_load',TRUE);
$_mysqli->run_config();
print_r($_mysqli->get_config());
?>
编辑：所以看起来 MySQLi 类中的错误变量可能是只读的。还有其他方法可以解决这个问题吗？我想也许有我自己的错误函数来检查父类和我自己的变量。