php mysql数据库连接类程序代码_PHP教程

php教程 mysql教程数据库教程连接类程序代码

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class cls_mysql{ var $querynum = 0; var $link; var $histories; var $dbhost; var $dbuser; var $dbpw; var $dbcharset; var $pconnect; var $tablepre; var $time; var $goneaway = 5; function connect($dbhost, $dbuser, $dbpw, $dbname = '', $dbcharset = '', $pconnect = 0, $tablepre='', $time = 0) { $this->dbhost = $dbhost; $this->dbuser = $dbuser; $this->dbpw = $dbpw; $this->dbname = $dbname; $this->dbcharset = $dbcharset; $this->pconnect = $pconnect; $this->tablepre = $tablepre; $this->time = $time; if($pconnect) { if(!$this->link = mysql_pconnect($dbhost, $dbuser, $dbpw)) { $this->halt('can not connect to mysql server'); } } else { if(!$this->link = mysql_connect($dbhost, $dbuser, $dbpw)) { $this->halt('can not connect to mysql server'); } } if($this->version() > '4.1') { if($dbcharset) { mysql_query("set character_set_connection=".$dbcharset.", character_set_results=".$dbcharset.", character_set_client=binary", $this->link); } if($this->version() > '5.0.1') { mysql_query("set sql_mode=''", $this->link); } } if($dbname) { mysql_select_db($dbname, $this->link); } } function fetch_array($query, $result_type = mysql_assoc) { return mysql_fetch_array($query, $result_type); } function result_first($sql) { $query = $this->query($sql); return $this->result($query, 0); } function fetch_first($sql) { $query = $this->query($sql); return $this->fetch_array($query); } function fetch_all($sql, $id = '') { $arr = array(); $query = $this->query($sql); while($data = $this->fetch_array($query)) { $id ? $arr[$data[$id]] = $data : $arr[] = $data; } return $arr; } function cache_gc() { $this->query("delete from {$this->tablepre}sqlcaches where expirytime"); } function query($sql, $type = '', $cachetime = false) { $func = $type == 'unbuffered' && @function_exists('mysql_unbuffered_query') ? 'mysql_unbuffered_query' : 'mysql_query'; if(!($query = $func($sql, $this->link)) && $type != 'silent') { $this->halt('mysql query error', $sql); } $this->querynum++; $this->histories[] = $sql; return $query; } function affected_rows() { return mysql_affected_rows($this->link); } function error() { return (($this->link) ? mysql_error($this->link) : mysql_error()); } function errno() { return intval(($this->link) ? mysql_errno($this->link) : mysql_errno()); } function result($query, $row) { $query = @mysql_result($query, $row); return $query; } function num_rows($query) { $query = mysql_num_rows($query); return $query; } function num_fields($query) { return mysql_num_fields($query); } function free_result($query) { return mysql_free_result($query); } function insert_id() { return ($id = mysql_insert_id($this->link)) >= 0 ? $id : $this->result($this->query("select last_insert_id()"), 0); } function fetch_row($query) { $query = mysql_fetch_row($query); return $query; } function fetch_fields($query) { return mysql_fetch_field($query); } function version() { return mysql_get_server_info($this->link); } function close() { return mysql_close($this->link); } function halt($message = '', $sql = '') { $error = mysql_error(); $errorno = mysql_errno(); if($errorno == 2006 && $this->goneaway-- > 0) { $this->connect($this->dbhost, $this->dbuser, $this->dbpw, $this->dbname, $this->dbcharset, $this->pconnect, $this->tablepre, $this->time); $this->query($sql); } else { $s = 'error:'.$error.''; $s .= 'errno:'.$errorno.''; $s .= 'sql::'.$sql; exit($s); } } }