一个完整的PHP MYSQL数据库类

2012年9月13日 | 标签: , | 点击: 3449 次

笔记一下,以备以后之用!

<?php
class 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,gb2312 
private $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$row->content 
public function fetch_Object()
{
return mysql_fetch_object($this->result);
}
//简化查询select 
public function findall($table)
{
$this->query("SELECT * FROM $table");
}
//简化查询select 
public function select($table, $columnName = "*", $condition = '', $debug = '')
{
$condition = $condition ? ' Where ' . $condition : NULL;
if ($debug) {
echo "SELECT $columnName FROM $table $condition";
} else {
$this->query("SELECT $columnName FROM $table $condition");
}
}
//简化删除del 
public function delete($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insert 
public 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update 
public 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");
} else if (getenv("HTTP_X_FORWARDED_FOR") && strcasecmp(getenv("HTTP_X_FORWARDED_FOR"), "unknown")) {
$ip = getenv("HTTP_X_FORWARDED_FOR");
} else if (getenv("REMOTE_ADDR") && strcasecmp(getenv("REMOTE_ADDR"), "unknown")) {
$ip = getenv("REMOTE_ADDR");
} else if (isset($_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.cx125.com");
exit();
}
}
}

 





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