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<?php
class mysql
{
/** @var mysqli $link */
private $link = null;
public function __construct(string $host, string $user, string $password, string $name)
{
$this->link = new mysqli();
if (!$this->link->real_connect($host, $user, $password, $name)) {
$this->link = null;
throw new Exception('Could not connect to MySQL');
}
}
public function __destruct()
{
if ($this->link)
$this->link->close();
}
public function __get($k)
{
if ($k == 'error') {
return $this->link->error;
}
return $this->$k;
}
public function query(string $sql)
{
if (func_num_args() > 1) {
$mark_count = substr_count($sql, '?');
$positions = array();
$last_pos = -1;
for ($i = 0; $i < $mark_count; $i++) {
$last_pos = strpos($sql, '?', $last_pos + 1);
$positions[] = $last_pos;
}
for ($i = $mark_count - 1; $i >= 0; $i--) {
$arg_val = func_get_arg($i + 1);
if (is_null($arg_val)) {
$v = 'NULL';
} else {
$v = '\'' . $this->escape($arg_val) . '\'';
}
$sql = substr_replace($sql, $v, $positions[$i], 1);
}
}
$q = $this->link->query($sql);
if (!$q) {
$error = $this->link->error;
trigger_error($error, E_USER_WARNING);
return false;
}
return $q;
}
public function insert(string $table, array $fields)
{
return $this->performInsert('INSERT', $table, $fields);
}
public function replace(string $table, array $fields)
{
return $this->performInsert('REPLACE', $table, $fields);
}
protected function performInsert(string $command, string $table, array $fields)
{
$names = [];
$values = [];
$count = 0;
foreach ($fields as $k => $v) {
$names[] = $k;
$values[] = $v;
$count++;
}
$sql = "{$command} INTO `{$table}` (`" . implode('`, `', $names) . "`) VALUES (" . implode(', ', array_fill(0, $count, '?')) . ")";
array_unshift($values, $sql);
return call_user_func_array([$this, 'query'], $values);
}
public function multipleInsert(string $table, array $rows)
{
return $this->performMultipleInsert('INSERT', $table, $rows);
}
public function multipleReplace(string $table, array $rows)
{
return $this->performMultipleInsert('REPLACE', $table, $rows);
}
protected function performMultipleInsert(string $command, string $table, array $rows)
{
$names = [];
$sql_rows = [];
foreach ($rows as $i => $fields) {
$row_values = [];
foreach ($fields as $field_name => $field_val) {
if ($i == 0) {
$names[] = $field_name;
}
$row_values[] = $this->escape($field_val);
}
$sql_rows[] = "('" . implode("', '", $row_values) . "')";
}
$sql = "{$command} INTO `{$table}` (`" . implode('`, `', $names) . "`) VALUES " . implode(', ', $sql_rows);
return $this->query($sql);
}
public function update(string $table, arrow $rows, string ...$cond)
{
$fields = [];
$args = [];
foreach ($rows as $row_name => $row_value) {
$fields[] = "`{$row_name}`=?";
$args[] = $row_value;
}
$sql = "UPDATE `$table` SET " . implode(', ', $fields);
if (!empty($cond)) {
$sql .= " WHERE " . $cond[0];
if (count($cond) > 1)
$args = array_merge($args, array_slice($cond, 1));
}
return $this->query($sql, ...$args);
}
public function fetch(mysqli_result $q)
{
$row = $q->fetch_assoc();
if (!$row) {
$q->free();
return false;
}
return $row;
}
public function result(mysqli_result $q, int $field = 0)
{
return $q ? $q->fetch_row()[$field] : false;
}
public function insertId()
{
return $this->link->insert_id;
}
public function numRows(mysqli_result $query): int
{
return $query->num_rows;
}
public function escape(string $s): string
{
return $this->link->real_escape_string($s);
}
}
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