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PHP以mysqli方式连接类完整代码实例

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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.

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<?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;
  }
}
?>

  。

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