php mysql 封装类实例代码

废话不多说了，具体代码如下所示：

<?phpclass mysql {private $db_host; //数据库主机private $db_user; //数据库用户名private $db_pwd; //数据库用户名密码private $db_database; //数据库名private $conn; //数据库连接标识;private $result; //执行query命令的结果资源标识private $sql; //sql执行语句private $row; //返回的条目数private $coding; //数据库编码，GBK,UTF8,gb2312private $bulletin = true; //是否开启错误记录private $show_error = false; //测试阶段，显示所有错误,具有安全隐患,默认关闭private $is_error = false; //发现错误是否立即终止,默认true,建议不启用，因为当有问题时用户什么也看不到是很苦恼的/*构造函数*/public function __construct($db_host, $db_user, $db_pwd, $db_database, $conn, $coding) {$this->db_host = $db_host;$this->db_user = $db_user;$this->db_pwd = $db_pwd;$this->db_database = $db_database;$this->conn = $conn;$this->coding = $coding;$this->connect();}/*数据库连接*/public function connect() {if ($this->conn == "pconn") {//永久链接$this->conn = mysql_pconnect($this->db_host, $this->db_user, $this->db_pwd);} else {//即使链接$this->conn = mysql_connect($this->db_host, $this->db_user, $this->db_pwd);}if (!mysql_select_db($this->db_database, $this->conn)) {if ($this->show_error) {$this->show_error("数据库不可用：", $this->db_database);}}mysql_query("SET NAMES $this->coding");}/*数据库执行语句，可执行查询添加修改删除等任何sql语句*/public function query($sql) {if ($sql == "") {$this->show_error("SQL语句错误：", "SQL查询语句为空");}$this->sql = $sql;$result = mysql_query($this->sql, $this->conn);if (!$result) {//调试中使用，sql语句出错时会自动打印出来if ($this->show_error) {$this->show_error("错误SQL语句：", $this->sql);}} else {$this->result = $result;}return $this->result;}/*创建添加新的数据库*/public function create_database($database_name) {$database = $database_name;$sqlDatabase = 'create database ' . $database;$this->query($sqlDatabase);}/*查询服务器所有数据库*///将系统数据库与用户数据库分开，更直观的显示？public function show_databases() {$this->query("show databases");echo "现有数据库：" . $amount = $this->db_num_rows($rs);echo "<br />";$i = 1;while ($row = $this->fetch_array($rs)) {echo "$i $row[Database]";echo "<br />";$i++;}}//以数组形式返回主机中所有数据库名public function databases() {$rsPtr = mysql_list_dbs($this->conn);$i = 0;$cnt = mysql_num_rows($rsPtr);while ($i < $cnt) {$rs[] = mysql_db_name($rsPtr, $i);$i++;}return $rs;}/*查询数据库下所有的表*/public function show_tables($database_name) {$this->query("show tables");echo "现有数据库：" . $amount = $this->db_num_rows($rs);echo "<br />";$i = 1;while ($row = $this->fetch_array($rs)) {$columnName = "Tables_in_" . $database_name;echo "$i $row[$columnName]";echo "<br />";$i++;}}/*mysql_fetch_row() array $row[0],$row[1],$row[2]mysql_fetch_array() array $row[0] 或 $row[id]mysql_fetch_assoc() array 用$row->content 字段大小写敏感mysql_fetch_object() object 用$row[id],$row[content] 字段大小写敏感*//*取得结果数据*/public function mysql_result_li() {return mysql_result($str);}/*取得记录集,获取数组-索引和关联,使用$row['content'] */public function fetch_array($resultt="") {if($resultt<>""){return mysql_fetch_array($resultt);}else{return mysql_fetch_array($this->result);}}//获取关联数组,使用$row['字段名']public function fetch_assoc() {return mysql_fetch_assoc($this->result);}//获取数字索引数组,使用$row[0],$row[1],$row[2]public function fetch_row() {return mysql_fetch_row($this->result);}//获取对象数组,使用$row->contentpublic function fetch_Object() {return mysql_fetch_object($this->result);}//简化查询selectpublic function findall($table) {$this->query("SELECT * FROM $table");}//简化查询selectpublic function select($table, $columnName = "*", $condition = '', $debug = '') {$condition = $condition ? ' Where ' . $condition : NULL;if ($debug) {echo "SELECT $columnName FROM $table $condition";} else {$this->query("SELECT $columnName FROM $table $condition");}}//简化删除delpublic function delete($table, $condition, $url = '') {if ($this->query("DELETE FROM $table WHERE $condition")) {if (!empty ($url))$this->Get_admin_msg($url, '删除成功！');}}//简化插入insertpublic function insert($table, $columnName, $value, $url = '') {if ($this->query("INSERT INTO $table ($columnName) VALUES ($value)")) {if (!empty ($url))$this->Get_admin_msg($url, '添加成功！');}}//简化修改updatepublic function update($table, $mod_content, $condition, $url = '') {//echo "UPDATE $table SET $mod_content WHERE $condition"; exit();if ($this->query("UPDATE $table SET $mod_content WHERE $condition")) {if (!empty ($url))$this->Get_admin_msg($url);}}/*取得上一步 INSERT 操作产生的 ID*/public function insert_id() {return mysql_insert_id();}//指向确定的一条数据记录public function db_data_seek($id) {if ($id > 0) {$id = $id -1;}if (!@ mysql_data_seek($this->result, $id)) {$this->show_error("SQL语句有误：", "指定的数据为空");}return $this->result;}// 根据select查询结果计算结果集条数public function db_num_rows() {if ($this->result == null) {if ($this->show_error) {$this->show_error("SQL语句错误", "暂时为空，没有任何内容！");}} else {return mysql_num_rows($this->result);}}// 根据insert,update,delete执行结果取得影响行数public function db_affected_rows() {return mysql_affected_rows();}//输出显示sql语句public function show_error($message = "", $sql = "") {if (!$sql) {echo "<font color='red'>" . $message . "</font>";echo "<br />";} else {echo "<fieldset>";echo "<legend>错误信息提示:</legend><br />";echo "<div style='font-size:14px; clear:both; font-family:Verdana, Arial, Helvetica, sans-serif;'>";echo "<div style='height:20px; background:#000000; border:1px #000000 solid'>";echo "<font color='white'>错误号：12142</font>";echo "</div><br />";echo "错误原因：" . mysql_error() . "<br /><br />";echo "<div style='height:20px; background:#FF0000; border:1px #FF0000 solid'>";echo "<font color='white'>" . $message . "</font>";echo "</div>";echo "<font color='red'><pre>" . $sql . "</pre></font>";$ip = $this->getip();if ($this->bulletin) {$time = date("Y-m-d H:i:s");$message = $message . "/r/n$this->sql" . "/r/n客户IP:$ip" . "/r/n时间 :$time" . "/r/n/r/n";$server_date = date("Y-m-d");$filename = $server_date . ".txt";$file_path = "error/" . $filename;$error_content = $message;//$error_content="错误的数据库，不可以链接";$file = "error"; //设置文件保存目录//建立文件夹if (!file_exists($file)) {if (!mkdir($file, 0777)) {//默认的 mode 是 0777，意味着最大可能的访问权die("upload files directory does not exist and creation failed");}}//建立txt日期文件if (!file_exists($file_path)) {//echo "建立日期文件";fopen($file_path, "w+");//首先要确定文件存在并且可写if (is_writable($file_path)) {//使用添加模式打开$filename，文件指针将会在文件的开头if (!$handle = fopen($file_path, 'a')) {echo "不能打开文件 $filename";exit;}//将$somecontent写入到我们打开的文件中。if (!fwrite($handle, $error_content)) {echo "不能写入到文件 $filename";exit;}//echo "文件 $filename 写入成功";echo "——错误记录被保存!";//关闭文件fclose($handle);} else {echo "文件 $filename 不可写";}} else {//首先要确定文件存在并且可写if (is_writable($file_path)) {//使用添加模式打开$filename，文件指针将会在文件的开头if (!$handle = fopen($file_path, 'a')) {echo "不能打开文件 $filename";exit;}//将$somecontent写入到我们打开的文件中。if (!fwrite($handle, $error_content)) {echo "不能写入到文件 $filename";exit;}//echo "文件 $filename 写入成功";echo "——错误记录被保存!";//关闭文件fclose($handle);} else {echo "文件 $filename 不可写";}}}echo "<br />";if ($this->is_error) {exit;}}echo "</div>";echo "</fieldset>";echo "<br />";}//释放结果集public function free() {@ mysql_free_result($this->result);}//数据库选择public function select_db($db_database) {return mysql_select_db($db_database);}//查询字段数量public function num_fields($table_name) {//return mysql_num_fields($this->result);$this->query("select * from $table_name");echo "<br />";echo "字段数：" . $total = mysql_num_fields($this->result);echo "<pre>";for ($i = 0; $i < $total; $i++) {print_r(mysql_fetch_field($this->result, $i));}echo "</pre>";echo "<br />";}//取得 MySQL 服务器信息public function mysql_server($num = '') {switch ($num) {case 1 :return mysql_get_server_info(); //MySQL 服务器信息break;case 2 :return mysql_get_host_info(); //取得 MySQL 主机信息break;case 3 :return mysql_get_client_info(); //取得 MySQL 客户端信息break;case 4 :return mysql_get_proto_info(); //取得 MySQL 协议信息break;default :return mysql_get_client_info(); //默认取得mysql版本信息}}//析构函数，自动关闭数据库,垃圾回收机制public function __destruct() {if (!empty ($this->result)) {$this->free();}mysql_close($this->conn);} //function __destruct();/*获得客户端真实的IP地址*/function getip() {if (getenv("HTTP_CLIENT_IP") && strcasecmp(getenv("HTTP_CLIENT_IP"), "unknown")) {$ip = getenv("HTTP_CLIENT_IP");} elseif (getenv("HTTP_X_FORWARDED_FOR") && strcasecmp(getenv("HTTP_X_FORWARDED_FOR"), "unknown")) {$ip = getenv("HTTP_X_FORWARDED_FOR");} elseif (getenv("REMOTE_ADDR") && strcasecmp(getenv("REMOTE_ADDR"), "unknown")) {$ip = getenv("REMOTE_ADDR");} elseif (isset ($_SERVER['REMOTE_ADDR']) && $_SERVER['REMOTE_ADDR'] && strcasecmp($_SERVER['REMOTE_ADDR'], "unknown")) {$ip = $_SERVER['REMOTE_ADDR'];} else {$ip = "unknown";}return ($ip);}function inject_check($sql_str) { //防止注入$check = eregi('select|insert|update|delete|/'|///*|/*|/././/|/.//|union|into|load_file|outfile', $sql_str);if ($check) {echo "输入非法注入内容！";exit ();} else {return $sql_str;}}function checkurl() { //检查来路if (preg_replace("/https?:////([^/://]+).*/i", "//1", $_SERVER['HTTP_REFERER']) !== preg_replace("/([^/:]+).*/", "//1", $_SERVER['HTTP_HOST'])) {header("Location: http://www.dareng.com");exit();}}}?>