About the use of sqlite3 in PHP

<?php
 
class SQLiteDB extends SQLite3 {
function __construct(){
try {
$this->open(dirname(__FILE__).&#39;/../data/sqlite_ecloud.db&#39;);
}catch (Exception $e){
die($e->getMessage());
}
}
}
 
class DBUtils {
private static $db;
private static function instance(){
if (!self::$db) {
self::$db = new SQLiteDB();
}
}
 
/**
* 创建表
* @param string $sql
*/
public static function create($sql){
self::instance();
$result = @self::$db->query($sql);
if ($result) {
return true;
}
return false;
}
 
/**
* 执行增删改操作
* @param string $sql
*/
public static function execute($sql){
self::instance();
$result = @self::$db->exec($sql);
if ($result) {
return true;
}
return false;
}
 
/**
* 获取记录条数
* @param string $sql
* @return int
*/
public static function count($sql){
self::instance();
$result = @self::$db->querySingle($sql);
return $result ? $result : 0;
}
 
/**
* 查询单个字段
* @param string $sql
* @return void|string
*/
public static function querySingle($sql){
self::instance();
$result = @self::$db->querySingle($sql);
return $result ? $result : &#39;&#39;;
}
 
/**
* 查询单条记录
* @param string $sql
* @return array
*/
public static function queryRow($sql){
self::instance();
$result = @self::$db->querySingle($sql,true);
return $result;
}
 
/**
* 查询多条记录
* @param string $sql
* @return array
*/
public static function queryList($sql){
self::instance();
$result = array();
$ret = @self::$db->query($sql);
if (!$ret) {
return $result;
}
while($row = $ret->fetchArray(SQLITE3_ASSOC) ){
array_push($result, $row);
}
return $result;
}
}
 
?>