PHP以mysqli方式连接类完整代码实例

本文所述的是一个在PHP中以mysqli方式连接数据库的一个数据库类实例，该数据库类是从一个PHP的CMS中整理出来的，可实现PHP连接数据库类，MySQLi版，兼容PHP4，对于有针对性需要的朋友可根据此代码进行优化和修改。

    <?php
    #==================================================================================================
    # Filename: /db/db_mysqli.php
    # Note : 连接数据库类，MySQLi版
    #==================================================================================================
    #[类库sql]
    class db_mysqli
    {
     var $query_count = 0;
     var $host;
     var $user;
     var $pass;
     var $data;
     var $conn;
     var $result;
     var $prefix = "qinggan_";
     //返回结果集类型，默认是数字+字符
     var $rs_type = MYSQLI_ASSOC;
     var $query_times = 0;#[查询时间]
     var $conn_times = 0;#[连接数据库时间]
     var $unbuffered = false;
     //定义查询列表
     var $querylist;
     var $debug = false;
     #[构造函数]
     function __construct($config=array())
     {
     $this->host = $config['host'] ? $config['host'] : 'localhost';
     $this->port = $config['port'] ? $config['port'] : '3306';
     $this->user = $config['user'] ? $config['user'] : 'root';
     $this->pass = $config['pass'] ? $config['pass'] : '';
     $this->data = $config['data'] ? $config['data'] : '';
     $this->debug = $config["debug"] ? $config["debug"] : false;
     $this->prefix = $config['prefix'] ? $config['prefix'] : 'qinggan_';
     if($this->data)
     {
      $ifconnect = $this->connect($this->data);
      if(!$ifconnect)
      {
      $this->conn = false;
      return false;
      }
     }
     return true;
     }
     #[兼容PHP4]
     function db_mysqli($config=array())
     {
     return $this->__construct($config);
     }
     #[连接数据库]
     function connect($database="")
     {
     $start_time = $this->time_used();
     if(!$this->port) $this->port = "3306";
     $this->conn = @mysqli_connect($this->host,$this->user,$this->pass,"",$this->port) or false;
     if(!$this->conn)
     {
      return false;
     }
     $version = $this->get_version();
     if($version>"4.1")
     {
      mysqli_query($this->conn,"SET NAMES 'utf8'");
      if($version>"5.0.1")
      {
      mysqli_query($this->conn,"SET sql_mode=''");
      }
     }
     $end_time = $this->time_used();
     $this->conn_times += round($end_time - $start_time,5);#[连接数据库的时间]
     $ifok = $this->select_db($database);
     return $ifok ? true : false;
     }
     function select_db($data="")
     {
     $database = $data ? $data : $this->data;
     if(!$database)
     {
      return false;
     }
     $this->data = $database;
     $start_time = $this->time_used();
     $ifok = mysqli_select_db($this->conn,$database);
     if(!$ifok)
     {
      return false;
     }
     $end_time = $this->time_used();
     $this->conn_times += round($end_time - $start_time,5);#[连接数据库的时间]
     return true;
     }
     #[关闭数据库连接，当您使用持续连接时该功能失效]
     function close()
     {
     if(is_resource($this->conn))
     {
      return mysqli_close($this->conn);
     }
     else
     {
      return true;
     }
     }
     function __destruct()
     {
     return $this->close();
     }
     function set($name,$value)
     {
     if($name == "rs_type")
     {
      $value = strtolower($value) == "num" ? MYSQLI_NUM : MYSQLI_ASSOC;
     }
     $this->$name = $value;
     }
     function query($sql)
     {
     if(!is_resource($this->conn))
     {
      $this->connect();
     }
     else
     {
      if(!mysql_ping($this->conn))
      {
       $this->close();
       $this->connect();
      }
     }
     if($this->debug)
     {
      $sqlkey = md5($sql);
      if($this->querylist)
      {
      $qlist = array_keys($this->querylist);
      if(in_array($sqlkey,$qlist))
      {
       $count = $this->querylist[$sqlkey]["count"] + 1;
       $this->querylist[$sqlkey] = array("sql"=>$sql,"count"=>$count);
      }else{
       $this->querylist[$sqlkey] = array("sql"=>$sql,"count"=>1);
      }
      }
      else{
      $this->querylist[$sqlkey] = array("sql"=>$sql,"count"=>1);
      }
     }
     $start_time = $this->time_used();
     $func = $this->unbuffered && function_exists("mysqli_multi_query") ? "mysqli_multi_query" : "mysqli_query";
     $this->result = @$func($this->conn,$sql);
     $this->query_count++;
     $end_time = $this->time_used();
     $this->query_times += round($end_time - $start_time,5);#[查询时间]
     if(!$this->result)
     {
      return false;
     }
     return $this->result;
     }
     function get_all($sql="",$primary="")
     {
     $result = $sql ? $this->query($sql) : $this->result;
     if(!$result)
     {
      return false;
     }
     $start_time = $this->time_used();
     $rs = array();
     $is_rs = false;
     while($rows = mysqli_fetch_array($result,$this->rs_type))
     {
      if($primary && $rows[$primary])
      {
      $rs[$rows[$primary]] = $rows;
      }
      else
      {
      $rs[] = $rows;
      }
      $is_rs = true;
     }
     $end_time = $this->time_used();
     $this->query_times += round($end_time - $start_time,5);#[查询时间]
     return ($is_rs ? $rs : false);
     }
     function get_one($sql="")
     {
     $start_time = $this->time_used();
     $result = $sql ? $this->query($sql) : $this->result;
     if(!$result)
     {
      return false;
     }
     $rows = mysqli_fetch_array($result,$this->rs_type);
     $end_time = $this->time_used();
     $this->query_times += round($end_time - $start_time,5);#[查询时间]
     return $rows;
     }
     function insert_id($sql="")
     {
     if($sql)
     {
      $rs = $this->get_one($sql);
      return $rs;
     }
     else
     {
      return mysqli_insert_id($this->conn);
     }
     }
     function insert($sql)
     {
     $this->result = $this->query($sql);
     $id = $this->insert_id();
     return $id;
     }
     function all_array($table,$condition="",$orderby="")
     {
     if(!$table)
     {
      return false;
     }
     $table = $this->prefix.$table;
     $sql = "SELECT * FROM ".$table;
     if($condition && is_array($condition) && count($condition)>0)
     {
      $sql_fields = array();
      foreach($condition AS $key=>$value)
      {
      $sql_fields[] = "`".$key."`='".$value."' ";
      }
      $sql .= " WHERE ".implode(" AND ",$sql_fields);
     }
     if($orderby)
     {
      $sql .= " ORDER BY ".$orderby;
     }
     $rslist = $this->get_all($sql);
     return $rslist;
     }
     function one_array($table,$condition="")
     {
     if(!$table)
     {
      return false;
     }
     $table = $this->prefix.$table;
     $sql = "SELECT * FROM ".$table;
     if($condition && is_array($condition) && count($condition)>0)
     {
      $sql_fields = array();
      foreach($condition AS $key=>$value)
      {
      $sql_fields[] = "`".$key."`='".$value."' ";
      }
      $sql .= " WHERE ".implode(" AND ",$sql_fields);
     }
     $rslist = $this->get_one($sql);
     return $rslist;
     }
     //将数组写入数据中
     function insert_array($data,$table,$insert_type="insert")
     {
     if(!$table || !is_array($data) || !$data)
     {
      return false;
     }
     $table = $this->prefix.$table;//自动增加表前缀
     if($insert_type == "insert")
     {
      $sql = "INSERT INTO ".$table;
     }
     else
     {
      $sql = "REPLACE INTO ".$table;
     }
     $sql_fields = array();
     $sql_val = array();
     foreach($data AS $key=>$value)
     {
      $sql_fields[] = "`".$key."`";
      $sql_val[] = "'".$value."'";
     }
     $sql.= "(".(implode(",",$sql_fields)).") VALUES(".(implode(",",$sql_val)).")";
     return $this->insert($sql);
     }
     //更新数据
     function update_array($data,$table,$condition)
     {
     if(!$data || !$table || !$condition || !is_array($data) || !is_array($condition))
     {
      return false;
     }
     $table = $this->prefix.$table;//自动增加表前缀
     $sql = "UPDATE ".$table." SET ";
     $sql_fields = array();
     foreach($data AS $key=>$value)
     {
      $sql_fields[] = "`".$key."`='".$value."'";
     }
     $sql.= implode(",",$sql_fields);
     $sql_fields = array();
     foreach($condition AS $key=>$value)
     {
      $sql_fields[] = "`".$key."`='".$value."' ";
     }
     $sql .= " WHERE ".implode(" AND ",$sql_fields);
     return $this->query($sql);
     }
     function count($sql="")
     {
     if($sql)
     {
      $this->rs_type = MYSQLI_NUM;
      $this->query($sql);
      $rs = $this->get_one();
      $this->rs_type = MYSQLI_ASSOC;
      return $rs[0];
     }
     else
     {
      return mysqli_num_rows($this->result);
     }
     }
     function num_fields($sql="")
     {
     if($sql)
     {
      $this->query($sql);
     }
     return mysqli_num_fields($this->result);
     }
     function list_fields($table)
     {
     $rs = $this->get_all("SHOW COLUMNS FROM ".$table);
     if(!$rs)
     {
      return false;
     }
     foreach($rs AS $key=>$value)
     {
      $rslist[] = $value["Field"];
     }
     return $rslist;
     }
     #[显示表名]
     function list_tables()
     {
     $rs = $this->get_all("SHOW TABLES");
     return $rs;
     }
     function table_name($table_list,$i)
     {
     return $table_list[$i];
     }
     function escape_string($char)
     {
     if(!$char)
     {
      return false;
     }
     return mysqli_escape_string($this->conn,$char);
     }
     function get_version()
     {
     return mysqli_get_server_info($this->conn);
     }
     function time_used()
     {
     $time = explode(" ",microtime());
     $used_time = $time[0] + $time[1];
     return $used_time;
     }
     //Mysql的查询时间
     function conn_times()
     {
     return $this->conn_times + $this->query_times;
     }
     //MySQL查询资料
     function conn_count()
     {
     return $this->query_count;
     }
     # 高效SQL生成查询，仅适合单表查询
     function phpok_one($tbl,$condition="",$fields="*")
     {
     $sql = "SELECT ".$fields." FROM ".$this->db->prefix.$tbl;
     if($condition)
     {
      $sql .= " WHERE ".$condition;
     }
     return $this->get_one($sql);
     }
     function debug()
     {
     if(!$this->querylist || !is_array($this->querylist) || count($this->querylist) < 1)
     {
      return false;
     }
     $html = '<table cellpadding="0" cellspacing="0" width="100%" bgcolor="#CECECE"><tr><td>';
     $html.= '<table cellpadding="1" cellspacing="1" width="100%">';
     $html.= '<tr><th bgcolor="#EFEFEF" height="30px">SQL</th><th bgcolor="#EFEFEF" width="80px">查询</th></tr>';
     foreach($this->querylist AS $key=>$value)
     {
      $html .= '<tr><td bgcolor="#FFFFFF"><div style="padding:3px;color:#6E6E6E;">'.$value['sql'].'</div></td>';
      $html .= '<td align="center" bgcolor="#FFFFFF"><div style="padding:3px;color:#000000;">'.$value["count"].'</div></td></tr>';
     }
     $html.= "</table>";
     $html.= "</td></tr></table>";
     return $html;
     }
     function conn_status()
     {
     if(!$this->conn) return false;
     return true;
     }
    }
    ?>