一个数据库操作PHP类
2018-07-20 来源：open-open
<?php
/*
* Author 墨龙
* Time 2010年12月2日 15:50:35
*/
$db = new mysql($db_host,$db_user,$db_password,$db_table,$db_conn,$pre,$coding);
class mysql{
private $db_host;
private $db_user;
private $db_password;
private $db_table;
private $db_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 $pre; //数据库表前缀
private $coding; //数据库编码，GBK,UTF8,gb2312
function __construct($db_host,$db_user,$db_password,$db_table,$db_conn,$pre,$coding){
$this->db_host = $db_host;
$this->db_user = $db_user;
$this->db_password = $db_password;
$this->db_table = $db_table;
$this->db_conn = $db_conn;
$this->pre = $pre;
$this->coding = $coding;
$this->connect();
}
function connect(){
$this->db_conn = @mysql_connect($this->db_host,$this->db_user,$this->db_password) or die($this->show_error("数据库链接错误,请检查数据库链接配置！"));
if(!mysql_select_db($this->db_table,$this->db_conn)){
echo "没有找到数据表：".$this->db_table;
}
mysql_select_db($this->db_table,$this->db_conn);
$this->query("SET NAMES $this->coding");
}
/*执行SQL语句的函数*/
function query($sql){
if(emptyempty($sql)){
$this->show_error("你的sql语句不能为空！");
}else{
$this->sql = $sql;
}
$result = mysql_query($this->sql,$this->db_conn);
return $this->result = $result;
}
/*创建添加新的数据库*/
public function create_database($database_name){
$database=$database_name;
$sqlDatabase = 'create database '.$database;
return $this->query($sqlDatabase);
}
// 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){
$this->show_error("sql语句错误!");
}
}else{
return mysql_num_rows($this->result);
}
}
/*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->db_conn);
$i=0;
$cnt=mysql_num_rows($rsPtr);
while($i<$cnt)
{
$rs[]=mysql_db_name($rsPtr,$i);
$i++;
}
return print_r($rs);
}
/*查询数据库下所有的表*/
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
*/
/*取得记录集,获取数组-索引和关联,使用$row['content'] */
public function fetch_array()
{
return @mysql_fetch_array($this->result);
}
//获取关联数组,使用$row['字段名']
public function fetch_ass()
{
return @mysql_fetch_assoc($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){
$table = $this->fulltablename($table);
$this->query("select * from $table");
}
public function select($table,$columnName,$condition){
$table = $this->fulltablename($table);
if(emptyempty($columnName)){
$columnName = "*";
}
$this->query("SELECT $columnName FROM $table $condition");
}
//简化的insert
function insert($table,$arr){
$table = $this->fulltablename($table);
$sql = "INSERT INTO $table ";
if(!is_array($arr)){
$this->show_error("请输入参数数组！");
}else{
$k = "";
$v = "";
foreach($arr as $key => $value){
$k .= "`$key`,";
$v .= "'".$value."',";
}
}
$sql = $sql." (".substr($k,0,-1).") VALUES (".substr($v,0,-1).")";
$this->query($sql);
}
//简化的update
function update($table,$arr,$where){
$table = $this->fulltablename($table);
$sql = "UPDATE $table SET ";
if(!is_array($arr)){
$this->show_error("请输入参数数组！");
}else{
foreach($arr as $key => $value){
$sql .= " `".$key."` = '".$value."' ,";
}
}
$sql = substr($sql,0,-1)." where ".$where;
return $this->query($sql);
}
//简化的delete
function delete($table,$where = ""){
$table = $this->fulltablename($table);
if(emptyempty($where)){
$this->show_error("条件不能为空!");
}else{
$where = " where ".$where;
}
$sql = "DELETE FROM $table ".$where;
//echo $sql;
return $this->query($sql);
}
//取得上一步 INSERT 操作产生的 ID
public function insert_id(){
return mysql_insert_id();
}
//加上前缀的数据表
public function fulltablename($table){
return $table = $this->pre.$table;
}
//查询字段数量
public function num_fields($table){
$table = $this->fulltablename($table);
$this->query("select * from $table");
echo "<br />";
echo "字段数：".$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->$db_conn);
}*/
/*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 show_error($str){
echo "<script language='Javascript'> alert('".$str."');history.back(-1);</script>";
}
}
?>
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