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亲自测试，网上其他版本没法用，有很多错误，这是本人亲自测试用的，绝对增删改查都可以。
<?php
/**
* Created by Netbeans.
* User: Lugo
* Date: 16-7-14
* Version: 1.0.0
* Time: 上午10:50
*/
class MysqlHelper {
const HOST="localhost";
const DATABASE = "demo";
const ENCODING = "UTF8";
private $uname = 'root';
private $pwd = '';
private static $_instance;
private function __construct($db=NULL) {
$this->uname='root';
$this->pwd='';
$db == NULL ? $this->connect($this->uname, $this->pwd) : $this->connect($this->uname, $this->pwd,$db);
}
private function connect($uname,$pwd,$db=NULL) {
$link = mysqli_connect(self::HOST, $uname, $pwd) or die($this->error());
if($db == null) {
mysqli_select_db( $link,self::DATABASE) or die('Error:没有监测到'.self::DATABASE.'数据库!');
} else {
mysqli_select_db($link, $db) or die ('Error:没有监测到'.self::DATABASE.'数据库');
}
//$this->query("SET NAMES".self::ENCODING) or die ('字符集设置错误');
mysqli_set_charset($link, "utf8");
return $link;
}
//单例模式(让类只有一个静态对象)
public static function getInstance($db=null){
if(!(self::$_instance instanceof self)) {
self::$_instance = $db == null ? new self() : new self($db);
}
return self::$_instance;
}
//防止对象被克隆
function __clone() {
trigger_error('不允许克隆',E_USER_ERROR);
}
/**************MySQL基本操作方法**************/
function query($sql) {
$conn = $this->connect("root", "","demo");
return mysqli_query($conn, $sql) ;
}
function fetch_array($query,$result_type=MYSQL_ASSOC) {
return mysqli_fetch_array($query,$result_type) ;
}
//获取一条记录(MYSQL_ASSOC,MYSQL_NUM,MYSQL_BOTH)
function get_one($sql,$result_type = MYSQLI_ASSOC){
$query = $this->query($sql);
$rt = $this->fetch_array($query,$result_type);
return $rt;
}
//获取全部记录
public function get_all($sql,$result_type = MYSQL_ASSOC){
$query = $this->query($sql);
$rt = array();
while ($row = $this->fetch_array($query,$result_type)){
array_push($rt, $row);
}
return $rt;
}
//返回上一次 MySQL操作所影响的记录行数
function affected_rows(){
return mysqli_affected_rows();
}
function result($query,$row){
return mysqli_result($query, $row);
}
function error(){
return mysqli_error();
}
function num_rows($query){
return mysqli_num_rows($query);
}
function num_fields($query){
return mysqli_num_fields($query);
}
function free_result($query){
return mysqli_free_result($query);
}
function insert_id(){
return mysqli_insert_id();
}
//从结果集中取得一行作为数字数组
function fetct_row($query){
return mysqli_fetch_row($query);
}
function version(){
return mysql_get_server_info();
}
function close(){
return mysqli_close();
}
/**************自定义方法:增删改查 *************/
/**
* @param $table 数据表名
* @param null $name 数据表字段名
* @param $var 数据表字段名对应的值
*/
function fn_insert($table,$name,$val=NULL) {
if($val == NULL) {
$this->query("INSERT INTO $table VALUES ($name)");
} else {
$this->query("INSERT INTO $table ($name) VALUES ($val)");
}
}
/**
* @param $table 数据表名
* @param null $where 查找条件的参数和值
*/
function fn_delete($table,$where = NULL) {
if($where == NULL ){
//删除表中所有数据,别乱来啊
$this->query("DELETE FROM ",$table);
} else {
//删除自定义数据
$whereParam = SelectOr::builtWhere($where);
$this->query("DELETE FROM $table WHERE ". $whereParam) ;
}
}
/**
* @param $table 数据表名
* @param $setVal 更新的参数和值
* @param null $where 查找条件的参数和值
*UPDATE `tableName` SET `description` = '中国馆是短发' WHERE `user`.`id` = 6;
*/
function fn_update($table, $setVal , $where ) {
//此处必须用selector::来访问下,作为另一个类,必须要调用
$valParam = SelectOr::builtWhere($setVal,",");
if($where == NULL) {
$this->query("UPDATE $table SET ".$valParam);
}else {
$whereParam = SelectOr::builtWhere($where);
$this->query(("UPDATE $table SET ".$valParam."WHERE".$whereParam));
}
}
/**
* @param $name $selectOr 查找条件设置操作对象,where部分内容
* @param int $selectName 所要选的字段,比如 select id,name from …… id和name就是本部分内容
* @param int $result_type 排序的种类,倒序或正序
*/
function fn_select($table, SelectOr $selectOr = NULL,$selectName=NULL,$result_type=MYSQLI_ASSOC) {
if($selectOr == NULL && $selectName==NULL) {
return $this->get_all("SELECT * FROM ".$table,$result_type);
}elseif ($selectName==NULL) {
$sql = "SELECT * FROM $table ".$selectOr->getRes();
return $this->get_all($sql,$result_type);
}else{
$sql = "SELECT $selectName FROM $table".$selectOr->getRes();
return $this->get_all($sql,$result_type);
}
}
}
//MySQL 选择操作类
class SelectOr {
private $sql;
private static $obj;
function __construct() {
}
public static function getInstance() {
if(!(self::$obj instanceof self)) {
self::$obj = new self;
}
self::$obj->sql = "";
return self::$obj;
}
function where($where){
$this->sql.=" WHERE". $this->builtWhere($where);
return $this;
}
function order($orderBy,$desc = TRUE) {
if($desc) {
$this->sql.=" ORDER BY $orderBy DESC";
}else{
$this->sql.=" ORDER BY $orderBy ASC";
}
return $this;
}
/*
function update($where){
$this->sql.= $this->builtWhere($where);
return $this;
}
*
*/
function limit($num) {
$this->sql.=" LIMIT $num";
return $this;
}
function getRes() {
//$sql就是上面的一个定义的变量,你需要在调用的页面写SelectOr::getInstance()->where(array("uid"=>1))时
//就会在where,order,limit中有$this->sql . = xxxx
return $this->sql;
}
/**
* 封装SQL语句Where
* @param $where
* @param string $connector 链接符号[,|and]
* @param string
*/
function builtWhere($where,$connector="AND") {
if(is_string($where)) {
return $where;
} elseif (is_array($where)) {
$whereParam = " ";
$i = 1;
//下面这个之前用$this来调用的,后来在update时报未定义,所以改成self:: 未分析之间区别
switch (self::arrLevel($where)) {
//如果是一纬数组,即参数形势:array('id'=>'5','uname'=>'lugo')
case 1:
foreach($where as $k=>$v) {
//如果$v是字符串,则用单引号引起来;
if(is_string($v)) {
$v = "'".$v."'";
}
//如果where语句长度是1则不加 and 操作
if($i==count($where)) {
$whereParam .="$k=$v";
} else {
$whereParam .= "$k=$v $connector";
}
$i++;
}
break;
//参数形式:array(array('id','>','5'),array('uname','!=','lugo'))
case 2:
for($k=0; $k<count($where) ; $k++) {
if(count($where[$k]) == 3 ) {
$key = $where[$k][0];
$operate = $where[$k][1];
$param = $where[$k][2];
if(is_string($param)) {
$param = "'".$param."'";
}
//计算添加 "and" 次数
if($i == count($where)) {
$whereParam .= " $key $operate $param";
}else{
$whereParam.=" $key $operate $param $connector";
}
$i++;
}
}
break;
default :
break;
}
return $whereParam;
}
}
//判断数组纬度(只能判断二维)
function arrLevel($array) {
$n = 1;
if(is_array($array)) {
foreach ($array as $val) {
if(is_array($val)) {
$n++;
break;
}
}
}
return $n;
}
}
?>
操作指南
<?php
//error_reporting(E_ALL^E_NOTICE^E_WARNING);
require_once("databases.php");
/*操作说明:
//选择其他数据库连接
MysqlHelper::getInstance()->connect("root","","demo");
//选择语句
$res = MysqlHelper::getInstance()->fn_select("blog" , SelectOr::getInstance()->where(array('uid'=>2))->order("uid",TRUE),"uid,title,content,time");
$res = MysqlHelper::getInstance()->fn_select("user", SelectOr::getInstance()->where(array('username'=>'hello3')));
$res = SelectOr::getInstance()->fn_select("library", SelectOr::getInstance()->where(array('max'=>100))->order("id",true)->limit(5),MYSQLI_ASSOC);
//插入的语句格式
$res= MysqlHelper::getInstance()->fn_insert("user","username,description","'hello的55','领导slslslsllslsl'");
//UPDATE `user` SET `description` = '中国馆是短发' WHERE `user`.`id` = 6;
$res = MysqlHelper::getInstance()->fn_update('user',array('description'=>'zzz'),array(array('username','=','hello3'),array('id','=','7')));
$res = MysqlHelper::getInstance()->fn_update('user', SelectOr::getInstance()->update(array('description'=>'这个之前乱码了')), SelectOr::getInstance()->update(array(array('username','=','hello3') ,array('id','=','7'))));
//删除语句
$res = MysqlHelper::getInstance()->fn_delete("user",array(array('username','=','hello3'),array('id','=','8')));
$db->fn_delete("library",array(array('current','>','3'),array('max','!=','150')));
print_r($res);
*/
?> 标签：
原文地址：http://blog.csdn.net/w520hua/article/details/51920257
