PHP mysql class implemented based on singleton mode

The example in this article describes the mysql class implemented in PHP based on the singleton mode. Share it with everyone for your reference, the details are as follows:

<&#63;php
defined('ACC')||exit('Access Denied');
// 封装mysql操作类,包括连接功能,及查询功能.
class mysql extends absdb{
  protected static $ins = null;
  protected $host; // 主机名
  protected $user; // 用户名
  protected $passwd; // 密码
  protected $db;   // 数据库名
  protected $port;  // 端口
  protected $conn = null;
  // 在内部操作,获得一个对象
  public static function getIns() {
    if(self::$ins === null) {
      self::$ins = new self();
    }
    $conf = conf::getIns();
    self::$ins->host = $conf->host;
    self::$ins->user = $conf->user;
    self::$ins->passwd = $conf->pwd;
    self::$ins->db = $conf->db;
    self::$ins->port = $conf->port;
    self::$ins->connect();
    self::$ins->select_db();
    self::$ins->setChar();
    return self::$ins;
  }
  // 不让外部做new操作,
  protected function __construct() {
  }
  // 连接数据库
  public function connect() {
    $this->conn = @mysql_connect($this->host,$this->user,$this->passwd,$this->port);
    if(!$this->conn) {
      $error = new Exception('数据库连不上',9);
      throw $error;
    }
  }
  // 发送sql查询
  public function query($sql) {
    $rs = mysql_query($sql,$this->conn);
    if(!$rs) {
      log::write($sql);
    }
    return $rs;
  }
  // 封装一个getAll方法
  // 参数:$sql
  // 返回: array,false
  public function getAll($sql) {
    $rs = $this->query($sql);
    if(!$rs) {
      return false;
    }
    $list = array();
    while($row = mysql_fetch_assoc($rs)) {
      $list[] = $row;
    }
    return $list;
  }
  // 封装一个getRow方法
  // 参数:$sql
  // 返回: array,false
  public function getRow($sql) {
    $rs = $this->query($sql);
    if(!$rs) {
      return false;
    }
    return mysql_fetch_assoc($rs);
  }
  // 封装一个getOne方法,
  // 参数: $sql
  // 返回: int,str(单一的值)
  public function getOne($sql) {
    $rs = $this->query($sql);
    if(!$rs) {
      return false;
    }
    $tmp = mysql_fetch_row($rs);
    return $tmp[0];
  }
  // 封装一个afftect_rows()方法
  // 参数:无
  // 返回 int 受影响行数
  public function affected_rows() {
    return mysql_affected_rows($this->conn);
  }
  // 返回最新生成的auto_increment列的值
  public function last_id() {
    return mysql_insert_id($this->conn);
  }
  // 选库函数
  public function select_db() {
    $sql = 'use ' . $this->db;
    return $this->query($sql);
  }
  // 设置字符集的函数
  public function setChar() {
    $sql = 'set names utf8';
    return $this->query($sql);
  }
  // 自动生成insert语句,update语句并执行
  public function autoExecute($data,$table,$act='insert',$where='') {
    if($act == 'insert') {
      $sql = 'insert into ' . $table . ' (';
      $sql .= implode(',',(array_keys($data)));
      $sql .= ') values (\'';
      $sql .= implode("','",array_values($data));
      $sql .= "')";
    } else if($act == 'update') {
      if(!trim($where)) {
        return false;
      }
      $sql = 'update ' . $table . ' set ';
      foreach($data as $k=>$v) {
        $sql .= $k;
        $sql .= '=';
        $sql .= "'".$v."',";
      }
      $sql = substr($sql,0,-1);
      $sql .= ' where ';
      $sql .= $where;
    } else {
      return false;
    }
    //return $sql;
    return $this->query($sql);
  }
}

Readers who are interested in more content related to PHP database operation can check out the special topics of this site: "Introduction Tutorial on PHP+mysql Database Operation", "PHP Database Operation Skills Based on PDO" Summary" and "Summary of common database operation skills in PHP"

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