Method Example of php Encapsulating db Class Connecting sqlite3 Database

  • 2021-08-28 19:30:48
  • OfStack

Preface

SQLite3 extensions are enabled by default above PHP 5.3. 0 +. You can disable it at compile time using--without-sqlite3.

Windows users can use this extension by enabling php_sqlite3. dll. php_sqlite3.dll is included by default in PHP releases after PHP 5.3. 0.

For detailed installation instructions, please check the PHP tutorial and its official website.

This article mainly introduces the related contents about php encapsulation db class connection sqlite3, and shares it for everyone's reference and study. The following words are not much to say, let's take a look at the detailed introduction.

Sample code:


<?php
 class dbManager{
 public $db;
 function __construct(){
  if(!file_exists('./db.php')){
  $this->init();
  return;
  }
  $this->db = new SQLite3('./db.php');
 }
 function init(){
  $this->db = new SQLite3('./db.php');
  // TODO:
 }
 function changes(){
  return $this->db->changes();
 }
 function query($sql,$param=null,$memb=null){
  $stmt=$this->db->prepare($sql);
  if(!$stmt)
  return false;
  if($param){
  if(is_array($param)){
   for($i=0;$i<count($param);$i++)
   $stmt->bindValue($i+1,$param[$i]);
  }else{
   $stmt->bindValue(1,$param);
  }
  }
  $rs=$stmt->execute();
  if(!$rs){
  $stmt->close();
  return false;
  }
  $arr=$rs->fetchArray(SQLITE3_NUM);
  $rs->finalize();
  $stmt->close();
  if(!$arr)
  return null;
  if(!$memb)
  return $arr;
  $res=array();
  for($i=0;$i<count($memb);$i++){
  $res[$memb[$i]]=$arr[$i];
  }
  return $res;
 }
 function queryAll($sql,$param=null,$memb=null){
  $stmt=$this->db->prepare($sql);
  if(!$stmt)
  return false;
  if($param){
  if(is_array($param)){
   for($i=0;$i<count($param);$i++)
   $stmt->bindValue($i+1,$param[$i]);
  }else{
   $stmt->bindValue(1,$param);
  }
  }
  $rs=$stmt->execute();
  if(!$rs){
  $stmt->close();
  return false;
  }  
  $res=array();
  while($arr=$rs->fetchArray(SQLITE3_NUM)){
  if(!$memb) {
   $res[]=$arr;
   continue;
  }
  if(count($memb)==1 && $memb[0]==null){
   $res[]=$arr[0];
   continue;
  }
  $it=array();
  for($i=0;$i<count($memb);$i++){
   $it[$memb[$i]]=$arr[$i];
  }
  $res[]=$it;
  }
  $rs->finalize();
  $stmt->close();
  
  return $res;
 }
 function querySingle($sql,$param=null){
  $res=$this->query($sql,$param);
  if(!$res)
  return false;
  return $res[0];
 } 
 function querySingleAll($sql,$param=null){
  $stmt=$this->db->prepare($sql);
  if(!$stmt)
  return false;
  if($param){
  if(is_array($param)){
   for($i=0;$i<count($param);$i++)
   $stmt->bindValue($i+1,$param[$i]);
  }else{
   $stmt->bindValue(1,$param);
  }
  }
  $rs=$stmt->execute();
  if(!$rs){
  $stmt->close();
  return false;
  }  
  $res=array();
  while($arr=$rs->fetchArray(SQLITE3_NUM)){
  $res[]=$arr[0];
  }
  $rs->finalize();
  $stmt->close();
  
  return $res;
 }
 function exec($sql,$param=null){
  $stmt=$this->db->prepare($sql);
  if(!$stmt)
  return false;
  if($param){
  if(is_array($param)){
   for($i=0;$i<count($param);$i++)
   $stmt->bindValue($i+1,$param[$i]);
  }else{
   $stmt->bindValue(1,$param);
  }
  }
  $rs=$stmt->execute();
  if($rs) {
  $res=true;
  $rs->finalize();
  }else{
  $res=false;
  }
  $stmt->close();
  return $res;
 } 
 function begin(){
  return $this->exec('BEGIN');
 }
 function rollback(){
  return $this->exec('ROLLBACK');
 }
 function commit(){
  return $this->exec('COMMIT');
 } 
 function escapeString($s){
  return $this->db->escapeString($s);
 }
 // Newly inserted id
 function lastInsertRowID(){
  return $this->db->lastInsertRowID();
 } 
 function lastErrorMsg (){
  return $this->db->lastErrorMsg();
 }
 }
?>

PDO supports database migration, if your deployment has a variety of databases in the future, then use it. Meanwhile, PDO is designed by C, the execution efficiency is high. He has been encapsulated as PHP extension library components. Run fast, high efficiency

For more information on how PHP encapsulates the easy-to-use DB class with PDO, please refer to this article: https://www.ofstack.com/article/119880. htm

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