Viewing file: mysql.php (6.75 KB) -rw-r--r-- Select action/file-type: (+) | (+) | (+) | Code (+) | Session (+) | (+) | SDB (+) | (+) | (+) | (+) | (+) | (+) |
<?php
class Mysql{ static private $link = null; static private $info = array( 'last_query' => null, 'num_rows' => null, 'insert_id' => null ); static private $connection_info = array(); static private $where; static private $limit; static private $order; function __construct($host, $user, $pass, $db){ self::$connection_info = array('host' => $host, 'user' => $user, 'pass' => $pass, 'db' => $db); } function __destruct(){ if(is_resource(self::$link)) mysql_close(self::$link); } /** * Setter method */ static private function set($field, $value){ self::$info[$field] = $value; } /** * Getter methods */ public function last_query(){ return self::$info['last_query']; } public function num_rows(){ return self::$info['num_rows']; } public function insert_id(){ return self::$info['insert_id']; } /** * Create or return a connection to the MySQL server. */ static private function connection(){ if(!is_resource(self::$link) || empty(self::$link)){ if(($link = mysql_connect(self::$connection_info['host'], self::$connection_info['user'], self::$connection_info['pass'])) && mysql_select_db(self::$connection_info['db'], $link)){ self::$link = $link; mysql_set_charset('utf8'); }else{ throw new Exception('Could not connect to MySQL database.'); } } return self::$link; } /** * MySQL Where methods */ static private function __where($info, $type = 'AND'){ $link =& self::connection(); $where = self::$where; foreach($info as $row => $value){ if(empty($where)){ $where = sprintf("WHERE `%s`='%s'", $row, mysql_real_escape_string($value)); }else{ $where .= sprintf(" %s `%s`='%s'", $type, $row, mysql_real_escape_string($value)); } } self::$where = $where; } public function where($field, $equal = null){ if(is_array($field)){ self::__where($field); }else{ self::__where(array($field => $equal)); } return $this; } public function and_where($field, $equal = null){ return $this->where($field, $equal); } public function or_where($field, $equal = null){ if(is_array($field)){ self::__where($field, 'OR'); }else{ self::__where(array($field => $equal), 'OR'); } return $this; } /** * MySQL limit method */ public function limit($limit){ self::$limit = 'LIMIT '.$limit; return $this; } /** * MySQL Order By method */ public function order_by($by, $order_type = 'DESC'){ $order = self::$order; if(is_array($by)){ foreach($by as $field => $type){ if(is_int($field) && !preg_match('/(DESC|desc|ASC|asc)/', $type)){ $field = $type; $type = $order_type; } if(empty($order)){ $order = sprintf("ORDER BY `%s` %s", $field, $type); }else{ $order .= sprintf(", `%s` %s", $field, $type); } } }else{ if(empty($order)){ $order = sprintf("ORDER BY `%s` %s", $by, $order_type); }else{ $order .= sprintf(", `%s` %s", $by, $order_type); } } self::$order = $order; return $this; } /** * MySQL query helper */ static private function extra(){ $extra = ''; if(!empty(self::$where)) $extra .= ' '.self::$where; if(!empty(self::$order)) $extra .= ' '.self::$order; if(!empty(self::$limit)) $extra .= ' '.self::$limit; // cleanup self::$where = null; self::$order = null; self::$limit = null; return $extra; } /** * MySQL Query methods */ public function query($qry, $return = false){ $link =& self::connection(); self::set('last_query', $qry); $result = mysql_query($qry); if(is_resource($result)){ self::set('num_rows', mysql_num_rows($result)); } if($return){ if(preg_match('/LIMIT 1/', $qry)){ $data = mysql_fetch_assoc($result); mysql_free_result($result); return $data; }else{ $data = array(); while($row = mysql_fetch_assoc($result)){ $data[] = $row; } mysql_free_result($result); return $data; } } return true; } public function get($table, $select = '*'){ $link =& self::connection(); if(is_array($select)){ $cols = ''; foreach($select as $col){ $cols .= "`{$col}`,"; } $select = substr($cols, 0, -1); } $sql = sprintf("SELECT %s FROM %s%s", $select, $table, self::extra()); self::set('last_query', $sql); if(!($result = mysql_query($sql))){ throw new Exception('Error executing MySQL query: '.$sql.'. MySQL error '.mysql_errno().': '.mysql_error()); $data = false; }elseif(is_resource($result)){ $num_rows = mysql_num_rows($result); self::set('num_rows', $num_rows); if($num_rows === 0){ $data = false; }elseif(preg_match('/LIMIT 1/', $sql)){ $data = mysql_fetch_assoc($result); }else{ $data = array(); while($row = mysql_fetch_assoc($result)){ $data[] = $row; } } }else{ $data = false; } mysql_free_result($result); return $data; } public function insert($table, $data){ $link =& self::connection(); $fields = ''; $values = ''; foreach($data as $col => $value){ $fields .= sprintf("`%s`,", $col); $values .= sprintf("'%s',", mysql_real_escape_string($value)); } $fields = substr($fields, 0, -1); $values = substr($values, 0, -1); $sql = sprintf("INSERT INTO %s (%s) VALUES (%s)", $table, $fields, $values); self::set('last_query', $sql); if(!mysql_query($sql)){ throw new Exception('Error executing MySQL query: '.$sql.'. MySQL error '.mysql_errno().': '.mysql_error()); }else{ self::set('insert_id', mysql_insert_id()); return true; } } public function update($table, $info){ if(empty(self::$where)){ throw new Exception("Where is not set. Can't update whole table."); }else{ $link =& self::connection(); $update = ''; foreach($info as $col => $value){ $update .= sprintf("`%s`='%s', ", $col, mysql_real_escape_string($value)); } $update = substr($update, 0, -2); $sql = sprintf("UPDATE %s SET %s%s", $table, $update, self::extra()); self::set('last_query', $sql); if(!mysql_query($sql)){ throw new Exception('Error executing MySQL query: '.$sql.'. MySQL error '.mysql_errno().': '.mysql_error()); }else{ return true; } } } public function delete($table){ if(empty(self::$where)){ throw new Exception("Where is not set. Can't delete whole table."); }else{ $link =& self::connection(); $sql = sprintf("DELETE FROM %s%s", $table, self::extra()); self::set('last_query', $sql); if(!mysql_query($sql)){ throw new Exception('Error executing MySQL query: '.$sql.'. MySQL error '.mysql_errno().': '.mysql_error()); }else{ return true; } } } } ?>
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