<?php
class Mysql{
//数据库连接返回值
private $conn
/**
* [构造函数，返回值给$conn]
* @param [string] $hostname [主机名]
* @param [string] $username[用户名]
* @param [string] $password[密码]
* @param [string] $dbname[数据库名]
* @param [string] $charset[字符集]
* @return [null]
*/
function __construct($hostname,$username,$password,$dbname,$charset='utf8'){
$config = @mysql_connect($hostname,$username,$password)
if(!$config){
echo '连接失败，请联系管理员'
exit
}
$this->conn = $config
$res = mysql_select_db($dbname)
if(!$res){
echo '连接失败，请联系管理员'
exit
}
mysql_set_charset($charset)
}
function __destruct(){
mysql_close()
}
/**
* [getAll 获取所有信息]
* @param [string] $sql [sql语句]
* @return [array] [返回二维数组]
*/
function getAll($sql){
$result = mysql_query($sql,$this->conn)
$data = array()
if($result && mysql_num_rows($result)>0){
while($row = mysql_fetch_assoc($result)){
$data[] = $row
}
}
return $data
}
/**
* [getOne 获取单条数据]
* @param [string] $sql [sql语句]
* @return [array] [返回一维数组]
*/
function getOne($sql){
$result = mysql_query($sql,$this->conn)
$data = array()
if($result && mysql_num_rows($result)>0){
$data = mysql_fetch_assoc($result)
}
return $data
}
/**
* [getOne 获取单条数据]
* @param [string] $table [表名]
* @param [string] $data [由字段名当键，属性当键值的一维数组]
* @return [type] [返回false或者插入数据的id]
*/
function insert($table,$data){
$str = ''
$str .="INSERT INTO `$table` "
$str .="(`".implode("`,`",array_keys($data))."`) "
$str .=" VALUES "
$str .= "('".implode("','",$data)."')"
$res = mysql_query($str,$this->conn)
if($res && mysql_affected_rows()>0){
return mysql_insert_id()
}else{
return false
}
}
/**
* [update 更新数据库]
* @param [string] $table [表名]
* @param [array] $data [更新的数据，由字段名当键，属性当键值的一维数组]
* @param [string] $where [条件，‘字段名’=‘字段属性’]
* @return [type] [更新成功返回影响的行数，更新失败返回false]
*/
function update($table,$data,$where){
$sql = 'UPDATE '.$table.' SET '
foreach($data as $key => $value){
$sql .= "`{$key}`='{$value}',"
}
$sql = rtrim($sql,',')
$sql .= " WHERE $where"
$res = mysql_query($sql,$this->conn)
if($res && mysql_affected_rows()){
return mysql_affected_rows()
}else{
return false
}
}
/**
* [delete 删除数据]
* @param [string] $table [表名]
* @param [string] $where [条件，‘字段名’=‘字段属性’]
* @return [type] [成功返回影响的行数，失败返回false]
*/
function del($table,$where){
$sql = "DELETE FROM `{$table}` WHERE {$where}"
$res = mysql_query($sql,$this->conn)
if($res && mysql_affected_rows()){
return mysql_affected_rows()
}else{
return false
}
}
}
?>
使用案例:
<?php
//包含数据库 *** 作类文件
include 'mysql.class.php'
//设置传入参数
$hostname='localhost'
$username='root'
$password='123456'
$dbname='aisi'
$charset = 'utf8'
//实例化对象
$db = new Mysql($hostname,$username,$password,$dbname)
//获取一条数据
$sql = "SELECT count(as_article_id) as count FROM as_article where as_article_type_id=1"
$count = $db->getOne($sql)
//获取多条数据
$sql = "SELECT * FROM as_article where as_article_type_id=1 order by as_article_addtime desc limit $start,$limit"
$service = $db->getAll($sql)
//插入数据
$arr = array(
'as_article_title'=>'数据库 *** 作类',
'as_article_author'=>'rex',
)
$res = $db->insert('as_article',$arr)
//更新数据
$arr = array(
'as_article_title'=>'实例化对象',
'as_article_author'=>'Lee',
)
$where = "as_article_id=1"
$res = $db->update('as_article',$arr,$where)
//删除数据
$where = "as_article_id=1"
$res = $db->del('as_article',$where)
?>
复制代码代码如下:
<?php
/*
MYSQL
数据库访问封装类
MYSQL
数据访问方式，php4支持以mysql_开头的过程访问方式，php5开始支持以mysqli_开头的过程和mysqli面向对象
访问方式，本封装类以mysql_封装
数据访问的一般流程：
1,连接数据库
mysql_connect
or
mysql_pconnect
2,选择数据库
mysql_select_db
3,执行SQL查询
mysql_query
4,处理返回的数据
mysql_fetch_array
mysql_num_rows
mysql_fetch_assoc
mysql_fetch_row
etc
*/
class
db_mysql
{
var
$querynum
=
0
//当前页面进程查询数据库的次数
var
$dblink
//数据库连接资源
//链接数据库
function
connect($dbhost,$dbuser,$dbpw,$dbname='',$dbcharset='utf-8',$pconnect=0
,
$halt=true)
{
$func
=
empty($pconnect)
?
'mysql_connect'
:
'mysql_pconnect'
$this->dblink
=
@$func($dbhost,$dbuser,$dbpw)
if
($halt
&&
!$this->dblink)
{
$this->halt("无法链接数据库！")
}
//设置查询字符集
mysql_query("SET
character_set_connection={$dbcharset},character_set_results={$dbcharset},character_set_client=binary",$this->dblink)
//选择数据库
$dbname
&&
@mysql_select_db($dbname,$this->dblink)
}
//选择数据库
function
select_db($dbname)
{
return
mysql_select_db($dbname,$this->dblink)
}
//执行SQL查询
function
query($sql)
{
$this->querynum++
return
mysql_query($sql,$this->dblink)
}
//返回最近一次与连接句柄关联的INSERT，UPDATE
或DELETE
查询所影响的记录行数
function
affected_rows()
{
return
mysql_affected_rows($this->dblink)
}
//取得结果集中行的数目,只对select查询的结果集有效
function
num_rows($result)
{
return
mysql_num_rows($result)
}
//获得单格的查询结果
function
result($result,$row=0)
{
return
mysql_result($result,$row)
}
//取得上一步
INSERT
*** 作产生的
ID,只对表有AUTO_INCREMENT
ID的 *** 作有效
function
insert_id()
{
return
($id
=
mysql_insert_id($this->dblink))
>=
0
?
$id
:
$this->result($this->query("SELECT
last_insert_id()"),
0)
}
//从结果集提取当前行，以数字为key表示的关联数组形式返回
function
fetch_row($result)
{
return
mysql_fetch_row($result)
}
//从结果集提取当前行，以字段名为key表示的关联数组形式返回
function
fetch_assoc($result)
{
return
mysql_fetch_assoc($result)
}
//从结果集提取当前行，以字段名和数字为key表示的关联数组形式返回
function
fetch_array($result)
{
return
mysql_fetch_array($result)
}
//关闭链接
function
close()
{
return
mysql_close($this->dblink)
}
//输出简单的错误html提示信息并终止程序
function
halt($msg)
{
$message
=
"<html>\n<head>\n"
$message
.=
"<meta
content='text/htmlcharset=gb2312'>\n"
$message
.=
"</head>\n"
$message
.=
"<body>\n"
$message
.=
"数据库出错：".htmlspecialchars($msg)."\n"
$message
.=
"</body>\n"
$message
.=
"</html>"
echo
$message
exit
}
}
?>
<?phpclass MySQL{
private $host //服务器地址
private $name //登录账号
private $pwd //登录密码
private $dBase //数据库名称
private $conn //数据库链接资源
private $result //结果集
private $msg //返回结果
private $fields //返回字段
private $fieldsNum //返回字段数
private $rowsNum //返回结果数
private $rowsRst //返回单条记录的字段数组
private $filesArray = array() //返回字段数组
private $rowsArray = array() //返回结果数组
private $charset='utf8' //设置 *** 作的字符集
private $query_count=0//查询结果次数
static private $_instance //存储对象
//初始化类
private function __construct($host='',$name='',$pwd='',$dBase=''){
if($host != '') $this->host = $host
if($name != '') $this->name = $name
if($pwd != '') $this->pwd = $pwd
if($dBase != '') $this->dBase = $dBase
$this->init_conn()
}
//防止被克隆
private function __clone(){}
public static function getInstance($host='',$name='',$pwd='',$dBase=''){
if(FALSE == (self::$_instance instanceof self)){
self::$_instance = new self($host,$name,$pwd,$dBase)
}
return self::$_instance
}
public function __set($name,$value){
$this->$name=$value
}
public function __get($name){
return $this->$name
}
//链接数据库
function init_conn(){
$this->conn=@mysql_connect($this->host,$this->name,$this->pwd) or die('connect db fail !')
@mysql_select_db($this->dBase,$this->conn) or die('select db fail !')
mysql_query("set names ".$this->charset)
}
//查询结果
function mysql_query_rst($sql){
if($this->conn == '') $this->init_conn()
$this->result = @mysql_query($sql,$this->conn)
$this->query_count++
}
//取得字段数
function getFieldsNum($sql){
$this->mysql_query_rst($sql)
$this->fieldsNum = @mysql_num_fields($this->result)
}
//取得查询结果数
function getRowsNum($sql){
$this->mysql_query_rst($sql)
if(mysql_errno() == 0){
return @mysql_num_rows($this->result)
}else{
return ''
}
}
//取得记录数组（单条记录）
function getRowsRst($sql,$type=MYSQL_BOTH){
$this->mysql_query_rst($sql)
if(empty($this->result)) return ''
if(mysql_error() == 0){
$this->rowsRst = mysql_fetch_array($this->result,$type)
return $this->rowsRst
}else{
return ''
}
}
//取得记录数组（多条记录）
function getRowsArray($sql,$type=MYSQL_BOTH){
!empty($this->rowsArray) ? $this->rowsArray=array() : ''
$this->mysql_query_rst($sql)
if(mysql_errno() == 0){
while($row = mysql_fetch_array($this->result,$type)) {
$this->rowsArray[] = $row
}
return $this->rowsArray
}else{
return ''
}
}
//更新、删除、添加记录数
function uidRst($sql){
if($this->conn == ''){
$this->init_conn()
}
@mysql_query($sql)
$this->rowsNum = @mysql_affected_rows()
if(mysql_errno() == 0){
return $this->rowsNum
}else{
return ''
}
}
//返回最近插入的一条数据库的id值
function returnRstId($sql){
if($this->conn == ''){
$this->init_conn()
}
@mysql_query($sql)
if(mysql_errno() == 0){
return mysql_insert_id()
}else{
return ''
}
}
//获取对应的字段值
function getFields($sql,$fields){
$this->mysql_query_rst($sql)
if(mysql_errno() == 0){
if(mysql_num_rows($this->result) >0){
$tmpfld = @mysql_fetch_row($this->result)
$this->fields = $tmpfld[$fields]
}
return $this->fields
}else{
return ''
}
}
//错误信息
function msg_error(){
if(mysql_errno() != 0) {
$this->msg = mysql_error()
}
return $this->msg
}
//释放结果集
function close_rst(){
mysql_free_result($this->result)
$this->msg = ''
$this->fieldsNum = 0
$this->rowsNum = 0
$this->filesArray = ''
$this->rowsArray = ''
}
//关闭数据库
function close_conn(){
$this->close_rst()
mysql_close($this->conn)
$this->conn = ''
}
//取得数据库版本
function db_version() {
return mysql_get_server_info()
}
}
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