代码如下。
<?php
/**
* 数据库操作类
* www.jb200.com
*/
class MyDB {
private $db_host; //数据库主机名
private $db_user; //数据库用户名
private $db_pwd; //数据库密码
private $db_database; //数据库名
private $conn; //连接标识
private $result; //执行query命令的结果资源标识
private $row; //返回的条目数
private $sql; //sql执行语句
private $coding; //数据库编码
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 $is_error=false; //发现错误是否立即终止,默认true,建议不启用，因为当有问题时用户什么也看不到是很苦恼的
//构造函数
function __construct($db_host,$db_user,$db_pwd,$db_database,$conn,$doding){
$this->db_host=$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"){
//永久连接
$this->conn=mysql_pconnect($this->db_host,$this->db_user,$this->db_pwd);
}else{
//即使连接
$this->conn=mysql_connect($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);
}
}
}
//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语句为空");
}
$this->sql=$sql;
$result=mysql_query($this->sql,$this->conn);
if(!$result){
if($this->show_error){
$this->show_error("错误sql语句：",$this->sql);
}
}else {
$this->result;
}
return $result;
}
//创建添加新的数据库
public function create_database($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分开，更直观的显示
public function show_database(){
$this->query("show databases");
echo "现在有的数据库：".$alinuxjishu/9952.html target=_blank class=infotextkey>mount=$this->db_num_rows($rs);
echo "<br>";
$i=1;
while ($row=$this->fetch_array($rs)){
echo "$i $row[Database]";
echo "<br>";
$i++;
}
}
//以数组的形式返回主机中所有的数据库名
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>";
$i++;
}
}
// 取得结果集
public function fetch_array($resultt=""){
if($resultt!=""){
return mysql_fetch_array($resultt);
}else {
return mysql_fetch_array($this->result);
}
}
//取得结果数 $row['content']
public function mysql_result_li(){
return mysql_result($str);
}
//获取关联数组 $row['字段名']
public function fetch_assoc(){
return mysql_fetch_assoc($this->result);
}
//获取数字索引数组 $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 $condition")){
if(!emptyempty($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 ($value)")){
if(!emptyempty($url)){
$this->Get_admin_msg($url,'添加成功');
}
}
}
//简化更新update
public function update($table,$mod_content,$condition,$url=''){
if($this->query("update $table set $mod_content where $condition")){
if(!emptyempty($url)){
$this->Get_admin_msg($url);
}
}
}
//取得上一步insert操作的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执行的结果驱动影响行数
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 = $message . "rn$this->sql" . "rn客户IP:$ip" . "rn时间 :$time" . "rnrn";
$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($file,0777)){
die("upload files directory does not exist and creation failed");
}
}
//建立txt日期文件
if(!file_exists($file_path)){
fopen($file_path,"w+");
if(is_writable($file_path)){
if(!$handle=fopen($file_path,'a')){
echo "不能打开文件 $filename";
exit;
}
if(!fwrite($handle,$error_content)){
echo "不能写到文件 $filename";
exit;
}
echo "——错误记录被保存!";
fclose($handle);
}else {
echo "文件 $filename 不可写";
}
}else {
if(is_writable($file_path)){
if(!$handle=fopen($file_path,'a')){
echo "不能打开文件 $filename";
exit;
}
if(!fwrite($handle,$error_content)){
echo "不能写入文件 $filename";
exit;
}
echo "——错误记录被保存!";
fclose($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){
$this->query("select * from $table_name");
echo "<br>";
echo "字段数：".$total=mysql_num_fields($this->result);
for ($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 ($num){
case 1:
return mysql_get_server_info();
break;
case 2:
return mysql_get_host_info();
break;
case 3:
return mysql_get_client_info();
break;
case 4:
return mysql_get_proto_info();
break;
default:
return mysql_get_client_info();
}
}
public function __destruct(){
if(!emptyempty($this->result)){
$this->free();
}
mysql_close($this->conn);
}
//获得客户端真实的ID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);
}
}
?>
