<?php /* * 数据库操作类 * */ class Mysql { private $server = ""; private $user = ""; private $password = ""; private $database = ""; private $linkMode = 1; private $link_id = 0; private $query_id = 0; private $query_times = 0; private $result = array (); private $fetchMode = MYSQL_ASSOC; private $err_no = 0; private $err_msg; private $character; //====================================== // 函数: mysql() // 功能: 构造函数 // 参数: 参数类的变量定义 // 说明: 构造函数将自动连接数据库 // 如果想手动连接去掉自动连接函数 //====================================== public function __construct($server, $user, $password, $database, $character = "UTF8", $linkMode = 0) { if (empty ( $server ) || empty ( $user ) || empty ( $database )) $this->halt ( "提交的数据库信息不完整!请检查服务器地址,用户和数据库是否正确有效" ); $this->server = $server; $this->user = $user; $this->password = $password; $this->database = $database; $this->linkMode = $linkMode; $this->character = $character; $this->connect (); } //====================================== // 函数: connect($server,$user,$password,$database) // 功能: 连接数据库 // 参数: $server 主机名, $user 用户名 // 参数: $password 密码, $database 数据库名称 // 返回: 0:失败 // 说明: 默认使用类中变量的初始值 //====================================== public function connect($server = "", $user = "", $password = "", $database = "") { $server = $server ? $server : $this->server; $user = $user ? $user : $this->user; $password = $password ? $password : $this->password; $database = $database ? $database : $this->database; $this->link_id = $this->linkMode ? mysql_pconnect ( $server, $user, $password, $database ) : mysql_connect ( $server, $user, $password, $database ); if (! $this->link_id) { $this->halt ( "数据库连接失败!请检查各项参数!" ); return 0; } if (! mysql_select_db ( $database, $this->link_id )) { $this->halt ( "无法选择数据库" ); return 0; } if ($this->character != "GBK" && $this->character != "UTF8") { $this->halt ( "输入的编码模式不正确!" ); return 0; } $this->query ( 'SET NAMES ' . $this->character ); return $this->link_id; } //====================================== // 函数: query($sql) // 功能: 数据查询 // 参数: $sql 要查询的SQL语句 // 返回: 0:失败 //====================================== public function query($sql) { $this->query_times ++; $this->query_id = mysql_query ( $sql, $this->link_id ); if (! $this->query_id) { $this->halt ( "<font color=red>" . $sql . "</font> 语句执行不成功!" ); return 0; } return $this->query_id; } //====================================== // 函数: setFetchMode($mode) // 功能: 设置取得记录的模式 // 参数: $mode 模式 MYSQL_ASSOC, MYSQL_NUM, MYSQL_BOTH // 返回: 0:失败 //====================================== public function setFetchMode($mode) { if ($mode == MYSQL_ASSOC || $mode == MYSQL_NUM || $mode == MYSQL_BOTH) { $this->fetchMode = $mode; return 1; } else { $this->halt ( "错误的模式." ); return 0; } } //====================================== // 函数: fetchRow() // 功能: 从记录集中取出一条记录 // 返回: 0: 出错 record: 一条记录 //====================================== public function fetchRow() { $this->record = mysql_fetch_array ( $this->query_id, $this->fetchMode ); return $this->record; } //====================================== // 函数: fetchAll() // 功能: 从记录集中取出所有记录 // 返回: 记录集数组 //====================================== public function fetchAll() { $arr [] = array (); while ( $this->record = mysql_fetch_array ( $this->query_id, $this->fetchMode ) ) $arr [] = $this->record; mysql_free_result ( $this->query_id ); return $arr; } //====================================== // 函数: getValue() // 功能: 返回记录中指定字段的数据 // 参数: $field 字段名或字段索引 // 返回: 指定字段的值 //====================================== public function getValue($filed) { return $this->record [$filed]; } //====================================== // 函数: getquery_id() // 功能: 返回查询号 //====================================== public function getquery_id() { return $this->query_id; } //====================================== // 函数: affectedRows() // 功能: 返回影响的记录数 //====================================== public function affectedRows() { return mysql_affected_rows ( $this->link_id ); } //====================================== // 函数: recordCount() // 功能: 返回查询记录的总数 // 参数: 无 // 返回: 记录总数 //====================================== public function recordCount() { return mysql_num_rows ( $this->query_id ); } //====================================== // 函数: getquery_times() // 功能: 返回查询的次数 // 参数: 无 // 返回: 查询的次数 //====================================== public function getquery_times() { return $this->query_times; } //====================================== // 函数: getVersion() // 功能: 返回mysql的版本 // 参数: 无 //====================================== public function getVersion() { $this->query ( "select version() as ver" ); $this->fetchRow (); return $this->getValue ( "ver" ); } //====================================== // 函数: getDBSize($database, $tblPrefix=null) // 功能: 返回数据库占用空间大小 // 参数: $database 数据库名 // 参数: $tblPrefix 表的前缀,可选 //====================================== public function getDBSize($database, $tblPrefix = null) { $sql = "SHOW TABLE STATUS FROM " . $database; if ($tblPrefix != null) { $sql .= " LIKE '$tblPrefix%'"; } $this->query ( $sql ); $size = 0; while ( $this->fetchRow () ) $size += $this->getValue ( "Data_length" ) + $this->getValue ( "Index_length" ); return $size; } //====================================== // 函数: halt($err_msg) // 功能: 处理所有出错信息 // 参数: $err_msg 自定义的出错信息 //===================================== public function halt($err_msg = "") { if ($err_msg == "") { $this->errno = mysql_errno (); $this->error = mysql_error (); echo "<b>mysql error:<b><br>"; echo $this->errno . ":" . $this->error . "<br>"; exit (); } else { echo "<b>mysql error:<b><br>"; echo $err_msg . "<br>"; exit (); } } //====================================== // 函数: insertID() // 功能: 返回最后一次插入的自增ID // 参数: 无 //====================================== public function insertID() { return mysql_insert_id (); } //====================================== //函数:close() //功能:关闭非永久的数据库连接 //参数:无 //====================================== public function close() { $link_id = $link_id ? $link_id : $this->link_id; mysql_close ( $link_id ); } //====================================== // 函数: sqlSelect() // 功能: 返回组合的select查询值 // 参数: $tbname 查询的表名 // 参数: $where 条件 // 参数: $fields 字段值 // 参数: $orderby 按某字段排序 // 参数: $sort 正序ASC,倒序DESC,$orderby 不为空是有效 // 参数: $limit 取得记录的条数,0,8 // 返回: 查询语句 //====================================== function sqlSelect($tbname, $where = "", $limit = 0, $fields = "*", $orderby = "", $sort = "DESC") { $sql = "SELECT " . $fields . " FROM " . $tbname . ($where ? " WHERE " . $where : "") . ($orderby ? " ORDER BY " . $orderby . " " . $sort : "") . ($limit ? " limit " . $limit : ""); return $sql; } //====================================== // 函数: sqlInsert() // 功能: Insert插入数据函数 // 参数: $taname 要插入数据的表名 // 参数: $row 要插入的内容 (数组) // 返回: 记录总数 // 返回: 插入语句 //====================================== function sqlInsert($tbname, $row) { foreach ( $row as $key => $value ) { $sqlfield .= $key . ","; $sqlvalue .= "'" . $value . "',"; } return "INSERT INTO " . $tbname . "(" . substr ( $sqlfield, 0, - 1 ) . ") VALUES (" . substr ( $sqlvalue, 0, - 1 ) . ")"; } //====================================== // 函数: sqlUpdate() // 功能: Update更新数据的函数 // 参数: $taname 要插入数据的表名 // 参数: $row 要插入的内容 (数组) // 参数: $where 要插入的内容 的条件 // 返回: Update语句 //====================================== function sqlUpdate($tbname, $row, $where) { foreach ( $row as $key => $value ) { $sqlud .= $key . "= '" . $value . "',"; } return "UPDATE " . $tbname . " SET " . substr ( $sqlud, 0, - 1 ) . " WHERE " . $where; } //====================================== // 函数: sqlDelete() // 功能: 删除指定条件的行 // 参数: $taname 要插入数据的表名 // 参数: $where 要插入的内容 的条件 // 返回: DELETE语句 //====================================== function sqlDelete($tbname, $where) { if (! $where) { $this->halt ( "删除函数没有指定条件!" ); return 0; } return "DELETE FROM " . $tbname . " WHERE " . $where; } //====================================== //函数:checkSql SQL语句的过滤 //功能:过滤一些特殊语法 //参数:$db_string 查询的SQL语句 //参数:$querytype 查询的类型 //====================================== function checkSql($db_string, $querytype = 'select') { $clean = ''; $old_pos = 0; $pos = - 1; //如果是普通查询语句,直接过滤一些特殊语法 if ($querytype == 'select') { $notallow1 = "[^0-9a-z@\._-]{1,}(union|sleep|benchmark|load_file|outfile)[^0-9a-z@\.-]{1,}"; //$notallow2 = "--|/\*"; if (eregi ( $notallow1, $db_string )) { exit ( "<font size='5' color='red'>Safe Alert: Request Error step 1 !</font>" ); } } //完整的SQL检查 while ( true ) { $pos = strpos ( $db_string, '\'', $pos + 1 ); if ($pos === false) { break; } $clean .= substr ( $db_string, $old_pos, $pos - $old_pos ); while ( true ) { $pos1 = strpos ( $db_string, '\'', $pos + 1 ); $pos2 = strpos ( $db_string, '\\', $pos + 1 ); if ($pos1 === false) { break; } elseif ($pos2 == false || $pos2 > $pos1) { $pos = $pos1; break; } $pos = $pos2 + 1; } $clean .= '$s$'; $old_pos = $pos + 1; } $clean .= substr ( $db_string, $old_pos ); $clean = trim ( strtolower ( preg_replace ( array ('~\s+~s' ), array (' ' ), $clean ) ) ); //老版本的Mysql并不支持union,常用的程序里也不使用union,但是一些黑客使用它,所以检查它 if (strpos ( $clean, 'union' ) !== false && preg_match ( '~(^|[^a-z])union($|[^[a-z])~s', $clean ) != 0) { $fail = true; } //发布版本的程序可能比较少包括--,#这样的注释,但是黑客经常使用它们 elseif (strpos ( $clean, '/*' ) > 2 || strpos ( $clean, '--' ) !== false || strpos ( $clean, '#' ) !== false) { $fail = true; } //这些函数不会被使用,但是黑客会用它来操作文件,down掉数据库 elseif (strpos ( $clean, 'sleep' ) !== false && preg_match ( '~(^|[^a-z])sleep($|[^[a-z])~s', $clean ) != 0) { $fail = true; } elseif (strpos ( $clean, 'benchmark' ) !== false && preg_match ( '~(^|[^a-z])benchmark($|[^[a-z])~s', $clean ) != 0) { $fail = true; } elseif (strpos ( $clean, 'load_file' ) !== false && preg_match ( '~(^|[^a-z])load_file($|[^[a-z])~s', $clean ) != 0) { $fail = true; } elseif (strpos ( $clean, 'into outfile' ) !== false && preg_match ( '~(^|[^a-z])into\s+outfile($|[^[a-z])~s', $clean ) != 0) { $fail = true; } //老版本的MYSQL不支持子查询,我们的程序里可能也用得少,但是黑客可以使用它来查询数据库敏感信息 elseif (preg_match ( '~\([^)]*?select~s', $clean ) != 0) { $fail = true; } if (! empty ( $fail )) { exit ( "<font size='5' color='red'>Safe Alert: Request Error step 2!</font>" ); } else { return $db_string; } } //====================================== //函数:析构函数 //功能:释放类,关闭非永久的数据库连接 //参数:无 //====================================== public function __destruct() { $this->close (); } } ?>