php操作类
<?php /** +---------------------- * Mysql操作类 +---------------------- * 文件名称 Db.class.php +---------------------- * 文件描述 mysql操作类 +---------------------- */ class Db{ //数据库连接标识 protected $link = null; //当前操作的表 public $table = ''; //查询参数 protected $options = array(); //当前执行的SQL语句 protected $sql = ''; //用什么编码传递数据 protected $dbCharset = 'utf8'; //缓存路径 protected $cachePath = './cache/'; //缓存扩展名 protected $cacheFileExt = "php"; //缓存文件名 protected $cacheFileName; //是否缓存 protected $cache = false; //缓存更新时间秒数 protected $cacheLimitTime = 60; //数据返回类型, 1代表数组, 2代表对象 protected $returnType = 1; /* * 根据当前动态文件生成缓存文件名 */ function setCacheFileName($fileName) { $cacheFileName = $this->cachePath . strtoupper(md5($fileName)).".".$this->cacheFileExt; $this->cacheFileName=$cacheFileName; } /* * 根据当前动态文件生成缓存文件名 */ function getCacheFileName() { return $this->cacheFileName; } /** * 连接数据库 * * @access public * @param array $db 数据库配置 * @return resource 数据库连接标识 */ public function connect($db){ //根据配置使用不同函数连接数据库 $db['host'] = isset($db['port']) ? $db['host'].':'.$db['port']: $db['host']; $db['char'] = isset($db['char']) ? $db['char']: $this->dbCharset; $func = $db['pconnect'] ? 'mysql_pconnect' : 'mysql_connect'; $this->link = $func($db['host'], $db['user'], $db['pwd']); mysql_select_db($db['database'], $this->link); mysql_query("SET NAMES '{$db['char']}'"); $this->cachePath = isset($db['cachepath']) ? $db['cachepath']: $this->cachePath; return $this->link; } /** * 查询符合条件的一条记录 * * @access public * @param string $where 查询条件 * @param string $field 查询字段 * @param string $table 表 * @return mixed 符合条件的记录 */ public function find($where = NULL, $field = '*', $table = ''){ return $this->findAll($where = NULL, $field = '*', $table = '', FALSE); } /** * 查询符合条件的所有记录 * * @access public * @param string $where 查询条件 * @param string $field 查询字段 * @param string $table 表 * @return mixed 符合条件的记录 */ public function findAll($where = NULL, $field = '*', $table = '', $all = TRUE){ $this->options['where'] = is_null($where) ? @$this->options['where']: $where; $this->options['field'] = isset($this->options['field']) ? $this->options['field']: $field; $this->options['table'] = $table == '' ? $this->table: $table; $sql = "SELECT {$this->options['field']} FROM `{$this->options['table']}` "; $sql .= isset($this->options['join']) ? ' LEFT JOIN '.$this->options['join']: ''; $sql .= isset($this->options['where']) ? ' WHERE '.$this->options['where']: ''; $sql .= isset($this->options['group']) ? ' GROUP BY '.$this->options['group']: ''; $sql .= isset($this->options['having']) ? ' HAVING '.$this->options['having']: ''; $sql .= isset($this->options['order']) ? ' ORDER BY '.$this->options['order']: ''; $sql .= isset($this->options['limit']) ? ' LIMIT '.$this->options['limit']: ''; $this->sql = $sql; $row = NULL; //如果开启了缓存, 那么重缓存中获取数据 if ($this->cache === TRUE){ $this->setCacheFileName($this->sql); $row = $this->readCache(); } //如果读取失败, 或则没有开启缓存 if (is_null($row)){ $result = $this->query(); $row = $all === TRUE ? $this->fetchAll($result): $this->fetch($result); //如果开启了缓存, 那么就写入 if ($this->cache === TRUE){ $this->writeCache($row); } $this->options = array(); } return $row; } /** * 读取结果集中的所有记录到数组中 * * @access public * @param resource $result 结果集 * @return array */ public function fetchAll($result = NULL){ $rows = array(); while ($row = $this->fetch($result)){ $rows[] = $row; } return $rows; } /** * 读取结果集中的一行记录到数组中 * * @access public * @param resource $result 结果集 * @param int $type 返回类型, 1为数组, 2为对象 * @return mixed 根据返回类型返回 */ public function fetch($result = NULL, $type = NULL){ $result = is_null($result) ? $this->result: $result; $type = is_null($type) ? $this->returnType: $type; $func = $type === 1 ? 'mysql_fetch_assoc' : 'mysql_fetch_object'; return $func($result); } /** * 执行SQL命令 * * @access public * @param string $sql SQL命令 * @param resource $link 数据库连接标识 * @return mixed 数据库结果集 */ public function query($sql = '', $link = NULL){ $sql = empty($sql) ? $this->sql: $sql; $link = is_null($link) ? $this->link: $link; $this->result = mysql_query($sql, $link); if (is_resource($this->result)){ return $this->result; } //如果执行SQL出现错误, 那么抛出异常 exit('<strong>Mysql error:</strong>'.$this->getError()); } /** * 执行SQL命令 * * @access public * @param string $sql SQL命令 * @param resource $link 数据库连接标识 * @return bool 是否执行成功 */ public function execute($sql = '', $link = NULL){ $sql = empty($sql) ? $this->sql: $sql; $link = is_null($link) ? $this->link: $link; if (mysql_query($sql, $link)){ return TRUE; } return FALSE; } /** * 插入记录 * * @access public * @param array $data 插入的记录, 格式:array('字段名'=>'值', '字段名'=>'值'); * @param string $table 表名 * @return bool 当前记录id */ public function add($data, $table = NULL){ $table = is_null($table) ? $this->table: $table; $sql = "INSERT INTO `{$table}`"; $fields = $values = array(); $field = $value = ''; //遍历记录, 格式化字段名称与值 foreach($data as $key => $val){ $fields[] = "`{$table}`.`{$key}`"; $values[] = is_numeric($val) ? $val : "'{$val}'"; } $field = join(',', $fields); $value = join(',', $values); unset($fields, $values); $sql .= "({$field}) VALUES({$value})"; $this->sql = $sql; $this->execute(); return $this->insertId(); } /** * 删除记录 * * @access public * @param string $where 条件 * @param string $table 表名 * @return bool 影响行数 */ public function delete($where = NULL, $table = NULL){ $table = is_null($table) ? $this->table: $table; $where = is_null($where) ? @$this->options['where']: $where; $sql = "DELETE FROM `{$table}` WHERE {$where}"; $this->sql = $sql; $this->execute(); return $this->affectedRows(); } /** * 更新记录 * * @access public * @param array $data 更新的数据 格式:array('字段名' => 值); * @param string $where 更新条件 * @param string $table 表名 * @return bool 影响多少条信息 */ public function update($data, $where = NULL, $table = NULL){ $table = is_null($table) ? $this->table: $table; $where = is_null($where) ? @$this->options['where']: $where; $sql = "UPDATE `{$table}` SET "; $values = array(); foreach($data as $key => $val){ $val = is_numeric($val) ? $val : "'{$val}'"; $values[] = "`{$table}`.`{$key}` = {$val}"; } $value = join(',', $values); $this->sql = $sql.$value." WHERE {$where}"; $this->execute(); return $this->affectedRows(); } /** * 读取缓存 * * @access public * @return mixed 如果读取成功返回缓存内容, 否则返回NULL */ protected function readCache(){ $file = $this->getCacheFileName(); if (file_exists($file)){ //缓存过期 if ((filemtime($file) + $this->cacheLimitTime) returnType){ $row = include $file; } else{ $data = file_get_contents($file); $row = unserialize($data); } return $row; } return NULL; } /** * 写入缓存 * * @access public * @param mixed $data 缓存内容 * @return bool 是否写入成功 */ public function writeCache($data){ $file = $this->getCacheFileName(); if ($this->makeDir(dirname($file))){ if (1 === $this->returnType){ $data = '<?php return '.var_export($data, TRUE).';?>'; }else{ $data = serialize($data); } } return file_put_contents($file, $data); } /* * 清除缓存文件 * string $fileName 指定文件名(含函数)或者all(全部) * 返回:清除成功返回true,反之返回false */ function clearCache( $fileName = "all" ) { if( $fileName != "all" ) { if( file_exists( $fileName ) ) { return @unlink( $fileName ); }else return false; } if ( is_dir( $this->cachePath ) ) { if ( $dir = @opendir( $this->cachePath ) ) { while ( $file = @readdir( $dir ) ) { $check = is_dir( $file ); if ( !$check ) @unlink( $this->cachePath . $file ); } @closedir( $dir ); return true; }else{ return false; } }else{ return false; } } /* * 连续建目录 * string $dir 目录字符串 * int $mode 权限数字 * 返回:顺利创建或者全部已建返回true,其它方式返回false */ function makeDir( $dir, $mode = "0777" ) { if( ! $dir ) return 0; $dir = str_replace( "\\", "/", $dir ); $mdir = ""; foreach( explode( "/", $dir ) as $val ) { $mdir .= $val."/"; if( $val == ".." || $val == "." || trim( $val ) == "" ) continue; if( ! file_exists( $mdir ) ) { if(!@mkdir( $mdir, $mode )){ return false; } } } return true; } //自动加载函数, 实现特殊操作 public function __call($func, $args) { if(in_array($func, array('field', 'join', 'where', 'order', 'group', 'limit', 'having'))) { $this->options[$func] = array_shift($args); return $this; } elseif($func === 'table'){ $this->options['table'] = array_shift($args); $this->table = $this->options['table']; return $this; } //如果函数不存在, 则抛出异常 exit('Call to undefined method Db::' . $func . '()'); } //------------------------------------------- //返回上一次操作所影响的行数 public function affectedRows($link = null){ $link = is_null($link) ? $this->link : $link; return mysql_affected_rows($link); } //返回上一次操作记录的id public function insertId($link = null){ $link = is_null($link) ? $this->link : $link; return mysql_insert_id($link); } //清空结果集 public function free($result = null){ $result = is_null($result) ? $this->result : $result; return mysql_free_result($result); } //返回错误信息 public function getError($link = NULL){ $link = is_null($link) ? $this->link : $link; return mysql_error($link); } //返回错误编号 public function getErrno($link = NULL){ $link = is_null($link) ? $this->link : $link; return mysql_errno($link); } } ?>