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<?php
namespace YOOtheme\Database;
use YOOtheme\Database as DatabaseInterface;
abstract class AbstractDatabase implements DatabaseInterface
{
const SINGLE_QUOTED_TEXT = '\'([^\'\\\\]*(?:\\\\.[^\'\\\\]*)*)\'';
const DOUBLE_QUOTED_TEXT = '"([^"\\\\]*(?:\\\\.[^"\\\\]*)*)"';
/**
* The driver.
*
* @var string
*/
public $driver;
/**
* The table prefix.
*
* @var string
*/
public $prefix;
/**
* The table prefix placeholder.
*
* @var string
*/
public $placeholder = '@';
/**
* The regex for parsing SQL query parts.
*
* @var array
*/
protected $regex = [];
/**
* Cache class reflections.
*
* @var array
*/
protected $reflClasses = [];
/**
* Cache class reflection properties.
*
* @var array
*/
protected $reflFields = [];
/**
* Gets the table prefix.
*
* @return string
*/
public function getPrefix()
{
return $this->prefix;
}
/**
* Replaces the table prefix placeholder with actual one.
*
* @param string $query
*
* @return string
*/
public function replacePrefix($query)
{
$offset = 0;
$length = strlen($this->prefix) - strlen($this->placeholder);
foreach ($this->getUnquotedQueryParts($query) as $part) {
if (!str_contains($part[0], $this->placeholder)) {
continue;
}
$replace = preg_replace(
$this->regex['placeholder'],
$this->prefix . '$1',
$part[0],
-1,
$count
);
if ($count) {
$query = substr_replace($query, $replace, $part[1] + $offset, strlen($part[0]));
$offset += $length;
}
}
return $query;
}
/**
* @inheritdoc
*
* @throws \ReflectionException
*/
public function fetchObject($statement, array $params = [], $class = 'stdClass', $args = [])
{
if ($row = $this->fetchAssoc($statement, $params)) {
return $this->hydrate($class, $row, $args);
}
}
/**
* @inheritdoc
*
* @throws \ReflectionException
*/
public function fetchAllObjects($statement, array $params = [], $class = 'stdClass', $args = [])
{
$result = [];
foreach ($this->fetchAll($statement, $params) as $row) {
$result[] = $this->hydrate($class, $row, $args);
}
return $result;
}
/**
* Parses the unquoted SQL query parts.
*
* @param string $query
*
* @return array
*/
protected function getUnquotedQueryParts($query)
{
if (!$this->regex) {
$this->regex['quotes'] =
"/([^'\"]+)(?:" .
self::DOUBLE_QUOTED_TEXT .
'|' .
self::SINGLE_QUOTED_TEXT .
')?/As';
$this->regex['placeholder'] =
'/' . preg_quote($this->placeholder) . '([a-zA-Z_][a-zA-Z0-9_]*)/';
}
preg_match_all($this->regex['quotes'], $query, $parts, PREG_OFFSET_CAPTURE);
return $parts[1];
}
/**
* Prepares a parametrized SQL query string.
*
* @param string $statement
* @param array $params
*
* @return string
*/
protected function prepareQuery($statement, array $params = [])
{
$parameters = [];
foreach ($params as $key => $value) {
$parameters[substr($key, 0, 1) !== ':' ? ":$key" : $key] = $this->prepareValue($value);
}
return strtr($this->replacePrefix($statement), $parameters);
}
/**
* Prepares a parameter value.
*
* @param mixed $value
*
* @return mixed
*/
protected function prepareValue($value)
{
if (is_string($value)) {
return $this->escape($value);
}
if (is_array($value)) {
return join(',', array_map([$this, 'prepareValue'], $value));
}
if (is_null($value)) {
return 'NULL';
}
return $value;
}
/**
* Creates object from data.
*
* @param string $class
* @param array $data
* @param array $args
*
* @throws \ReflectionException
*
* @return object
*/
protected function hydrate($class, array $data, array $args = [])
{
if ('stdClass' === $class) {
return (object) $data;
}
$reflClass = $this->getReflectionClass($class);
$reflFields = $this->getReflectionFields($class);
$values = array_intersect_key($data, $reflFields);
$instance = $reflClass->newInstanceWithoutConstructor();
foreach ($values as $key => $value) {
$reflFields[$key]->setValue($instance, $value);
}
if ($constructor = $reflClass->getConstructor()) {
$constructor->invokeArgs($instance, $args);
}
return $instance;
}
/**
* Gets ReflectionClass for given class name.
*
* @param string $class
*
* @throws \ReflectionException
*
* @return \ReflectionClass
*/
protected function getReflectionClass($class)
{
if (!isset($this->reflClasses[$class])) {
$this->reflClasses[$class] = new \ReflectionClass($class);
}
return $this->reflClasses[$class];
}
/**
* Gets ReflectionProperty array for given class name.
*
* @param string $class
*
* @throws \ReflectionException
*
* @return \ReflectionProperty[]
*/
protected function getReflectionFields($class)
{
if (!isset($this->reflFields[$class])) {
$this->reflFields[$class] = [];
foreach ($this->getReflectionClass($class)->getProperties() as $property) {
$property->setAccessible(true);
$this->reflFields[$class][$property->getName()] = $property;
}
}
return $this->reflFields[$class];
}
}