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后面幾個(gè)show_databases和show_tables....等方法都用了一堆echo，好像一直不喜歡在類的方法里直接用輸出語句，不過這也只是列舉數(shù)據(jù)庫和表名，構(gòu)造函數(shù)的參數(shù)也可以給個(gè)默認(rèn)值吧。
復(fù)制代碼 代碼如下:
<?php
/*
* filename：mysql數(shù)據(jù)庫連接類
*/
class mysql{
private $db_host; //數(shù)據(jù)庫主機(jī)
private $db_user; //數(shù)據(jù)庫用戶名
private $db_pwd; //數(shù)據(jù)庫用戶名密碼
private $db_database; //數(shù)據(jù)庫名
private $conn; //數(shù)據(jù)庫連接標(biāo)識(shí);
private $result; //執(zhí)行query命令的結(jié)果資源標(biāo)識(shí)
private $sql; //sql執(zhí)行語句
private $row; //返回的條目數(shù)
private $coding; //數(shù)據(jù)庫編碼，GBK,UTF8,gb2312
private $bulletin = true; //是否開啟錯(cuò)誤記錄
private $show_error = true; //測試階段，顯示所有錯(cuò)誤,具有安全隱患,默認(rèn)關(guān)閉
private $is_error = false; //發(fā)現(xiàn)錯(cuò)誤是否立即終止,默認(rèn)true,建議不啟用，因?yàn)楫?dāng)有問題時(shí)用戶什么也看不到是很苦惱的
/*構(gòu)造函數(shù)*/
public function __construct($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;
$this->connect();
}
/*數(shù)據(jù)庫連接*/
public function connect()
{
if($this->conn=="pconn"){
//永久鏈接
$this->conn=mysql_pconnect($this->db_host,$this->db_user,$this->db_pwd);
}else{
//即時(shí)鏈接
$this->conn=mysql_connect($this->db_host,$this->db_user,$this->db_pwd);
}
if(!mysql_select_db($this->db_database,$this->conn)){
if($this->show_error){
$this->show_error("數(shù)據(jù)庫不可用：",$this->db_database);
}
}
mysql_query("SET NAMES $this->coding");
}
/*數(shù)據(jù)庫執(zhí)行語句，可執(zhí)行查詢添加修改刪除等任何sql語句*/
public function query($sql)
{
if($sql == ""){
$this->show_error("sql語句錯(cuò)誤：","sql查詢語句為空");}
$this->sql = $sql;
$result = mysql_query($this->sql,$this->conn);
if(!$result){
//調(diào)試中使用，sql語句出錯(cuò)時(shí)會(huì)自動(dòng)打印出來
if($this->show_error){
$this->show_error("錯(cuò)誤sql語句：",$this->sql);
}
}else{
$this->result = $result;
}
return $this->result;
}
/*創(chuàng)建添加新的數(shù)據(jù)庫*/
public function create_database($database_name){
$database=$database_name;
$sqlDatabase = 'create database '.$database;
$this->query($sqlDatabase);
}
/*查詢服務(wù)器所有數(shù)據(jù)庫*/
//將系統(tǒng)數(shù)據(jù)庫與用戶數(shù)據(jù)庫分開，更直觀的顯示？
public function show_databases(){
$rs=$this->query("show databases");
echo "現(xiàn)有數(shù)據(jù)庫：".$amount =$this->db_num_rows($rs);
echo "<br />";
$i=1;
while($row = $this->fetch_array($rs)){
echo "$i $row[Database]";
echo "<br />";
$i++;
}
}
//以數(shù)組形式返回主機(jī)中所有數(shù)據(jù)庫名
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 $rs;
}
/*查詢數(shù)據(jù)庫下所有的表*/
function show_tables($database_name){
$this->query("show tables");
echo "現(xiàn)有數(shù)據(jù)庫：".$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 字段大小寫敏感
mysql_fetch_object() object 用$row[id],$row[content] 字段大小寫敏感
*/
/*取得結(jié)果數(shù)據(jù)*/
public function mysql_result_li()
{
return mysql_result($str);
}
/*取得記錄集,獲取數(shù)組-索引和關(guān)聯(lián),使用$row['content'] */
public function fetch_array()
{
return mysql_fetch_array($this->result);
}
//獲取關(guān)聯(lián)數(shù)組,使用$row['字段名']
public function fetch_assoc()
{
return mysql_fetch_assoc($this->result);
}
//獲取數(shù)字索引數(shù)組,使用$row[0],$row[1],$row[2]
public function fetch_row()
{
return mysql_fetch_row($this->result);
}
//獲取對(duì)象數(shù)組,使用$row->content
public function fetch_Object()
{
return mysql_fetch_object($this->result);
}
//簡化查詢select
public function findall($table)
{
$this->query("SELECT * FROM $table");
}
//簡化查詢select
public function select($table,$columnName,$condition)
{
if($columnName==""){
$columnName="*";
}
$this->query("SELECT $columnName FROM $table $condition");
}
//簡化刪除del
public function delete($table,$condition){
$this->query("DELETE FROM $table WHERE $condition");
}
//簡化插入insert
public function insert($table,$columnName,$value){
$this->query("INSERT INTO $table ($columnName) VALUES ($value)");
}
//簡化修改update
public function update($table,$mod_content,$condition){
$this->query("UPDATE $table SET $mod_content WHERE $condition");
}
/*取得上一步 INSERT 操作產(chǎn)生的 ID*/
public function insert_id(){
return mysql_insert_id();
}
//指向確定的一條數(shù)據(jù)記錄
public function db_data_seek($id){
if($id>0){
$id=$id-1;
}
if(!@mysql_data_seek($this->result,$id)){
$this->show_error("sql語句有誤：", "指定的數(shù)據(jù)為空");
}
return $this->result;
}
// 根據(jù)select查詢結(jié)果計(jì)算結(jié)果集條數(shù)
public function db_num_rows(){
if($this->result==null){
if($this->show_error){
$this->show_error("sql語句錯(cuò)誤","暫時(shí)為空，沒有任何內(nèi)容！");
}
}else{
return mysql_num_rows($this->result);
}
}
// 根據(jù)insert,update,delete執(zhí)行結(jié)果取得影響行數(shù)
public function db_affected_rows(){
return mysql_affected_rows();
}
//輸出顯示sql語句
public function show_error($message="",$sql=""){
if(!$sql){
echo "<font color='red'>".$message."</font>";
echo "<br />";
}else{
echo "<fieldset>";
echo "<legend>錯(cuò)誤信息提示:</legend><br />";
echo "<div style="font-size:14px; clear:both; font-family:Verdana, Arial, Helvetica, sans-serif;" mce_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'>錯(cuò)誤號(hào)：12142</font>";
echo "</div><br />";
echo "錯(cuò)誤原因：".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$this->sql"."/r/n客戶IP:$ip"."/r/n時(shí)間 :$time"."/r/n/r/n";
$server_date=date("Y-m-d");
$filename=$server_date.".txt";
$file_path="error/".$filename;
$error_content=$message;
//$error_content="錯(cuò)誤的數(shù)據(jù)庫，不可以鏈接";
$file = "error"; //設(shè)置文件保存目錄
//建立文件夾
if(!file_exists($file)){
if(!mkdir($file,0777)){
//默認(rèn)的 mode 是 0777，意味著最大可能的訪問權(quán)
die("upload files directory does not exist and creation failed");
}
}
//建立txt日期文件
if(!file_exists($file_path)){
//echo "建立日期文件";
fopen($file_path,"w+");
//首先要確定文件存在并且可寫
if (is_writable($file_path))
{
//使用添加模式打開$filename，文件指針將會(huì)在文件的開頭
if (!$handle = fopen($file_path, 'a'))
{
echo "不能打開文件 $filename";
exit;
}
//將$somecontent寫入到我們打開的文件中。
if (!fwrite($handle, $error_content))
{
echo "不能寫入到文件 $filename";
exit;
}
//echo "文件 $filename 寫入成功";
echo "――錯(cuò)誤記錄被保存!";
//關(guān)閉文件
fclose($handle);
} else {
echo "文件 $filename 不可寫";
}
}else{
//首先要確定文件存在并且可寫
if (is_writable($file_path))
{
//使用添加模式打開$filename，文件指針將會(huì)在文件的開頭
if (!$handle = fopen($file_path, 'a'))
{
echo "不能打開文件 $filename";
exit;
}
//將$somecontent寫入到我們打開的文件中。
if (!fwrite($handle, $error_content))
{
echo "不能寫入到文件 $filename";
exit;
}
//echo "文件 $filename 寫入成功";
echo "――錯(cuò)誤記錄被保存!";
//關(guān)閉文件
fclose($handle);
} else {
echo "文件 $filename 不可寫";
}
}
}
echo "<br />";
if($this->is_error){
exit;
}
}
echo "</div>";
echo "</fieldset>";
echo "<br />";
}
//釋放結(jié)果集
public function free(){
@mysql_free_result($this->result);
}
//數(shù)據(jù)庫選擇
public function select_db($db_database){
return mysql_select_db($db_database);
}
//查詢字段數(shù)量
public function num_fields($table_name){
//return mysql_num_fields($this->result);
$this->query("select * from $table_name");
echo "<br />";
echo "字段數(shù)：".$total = mysql_num_fields($this->result);
echo "<pre>";
for ($i=0; $i<$total; $i++){
print_r(mysql_fetch_field($this->result,$i) );
}
echo "</pre>";
echo "<br />";
}
//取得 MySQL 服務(wù)器信息
public function mysql_server($num=''){
switch ($num){
case 1 :
return mysql_get_server_info(); //MySQL 服務(wù)器信息
break;
case 2 :
return mysql_get_host_info(); //取得 MySQL 主機(jī)信息
break;
case 3 :
return mysql_get_client_info(); //取得 MySQL 客戶端信息
break;
case 4 :
return mysql_get_proto_info(); //取得 MySQL 協(xié)議信息
break;
default:
return mysql_get_client_info(); //默認(rèn)取得mysql版本信息
}
}
//析構(gòu)函數(shù)，自動(dòng)關(guān)閉數(shù)據(jù)庫,垃圾回收機(jī)制
public function __destruct()
{
if(!empty($this->result)){
$this->free();
}
mysql_close($this->conn);
}//function __destruct();
/*獲得客戶端真實(shí)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);
}
}
?>
php技術(shù)：深入理解php的MySQL連接類，轉(zhuǎn)載需保留來源！
鄭重聲明：本文版權(quán)歸原作者所有，轉(zhuǎn)載文章僅為傳播更多信息之目的，如作者信息標(biāo)記有誤，請(qǐng)第一時(shí)間聯(lián)系我們修改或刪除，多謝。
