数据库操作相关（sql语句-php）

文件：db.config.smarty.php

这个文件主要是用于数据库配置

 <?php
 $db = array(
         'host'=>'localhost',
         'user'=>'root',
         'password'=>'********',
         'database'=>'test',
 )
 ?>

文件：db.conn.smarty.php

这个文件用于数据库操作，查询，删除，更新，添加。

要引用配置文件：require_once('db.config.smarty.php');

 <?php
     class db {
         public $conn;
         public static $sql;
         public static $instance=null;
         private function __construct(){
             require_once('db.config.smarty.php');
             $this->conn = mysql_connect($db['host'],$db['user'],$db['password']);
             if(!mysql_select_db($db['database'],$this->conn)){
                 echo "失败";
             };
             mysql_query('set names utf8',$this->conn);
         }
         public static function getInstance(){
             if(is_null(self::$instance)){
                 self::$instance = new db;
             }
             return self::$instance;
         }
         /**
          * 查询数据库
          */
         public function select($table,$condition=array(),$field = array()){
             $where='';
             if(!empty($condition)){

                 foreach($condition as $k=>$v){
                     $where.=$k."='".$v."' and ";
                 }
                 $where='where '.$where .'1=1';
             }
             $fieldstr = '';
             if(!empty($field)){

                 foreach($field as $k=>$v){
                     $fieldstr.= $v.',';
                 }
                  $fieldstr = rtrim($fieldstr,',');
             }else{
                 $fieldstr = '*';
             }
             self::$sql = "select {$fieldstr} from {$table} {$where}";
             $result=mysql_query(self::$sql,$this->conn);
             $resuleRow = array();
             $i = 0;
             while($row=mysql_fetch_assoc($result)){
                 foreach($row as $k=>$v){
                     $resuleRow[$i][$k] = $v;
                 }
                 $i++;
             }
             return $resuleRow;
         }
         /**
          * 添加一条记录
          */
          public function insert($table,$data){
              $values = '';
              $datas = '';
              foreach($data as $k=>$v){
                  $values.=$k.',';
                  $datas.="'$v'".',';
              }
              $values = rtrim($values,',');
              $datas   = rtrim($datas,',');
              self::$sql = "INSERT INTO  {$table} ({$values}) VALUES ({$datas})";
             if(mysql_query(self::$sql)){
                 return mysql_insert_id();
             }else{
                 return false;
             };
          }
          /**
           * 修改一记录
           */
         public function update($table,$data,$condition=array()){
             $where='';
             if(!empty($condition)){

                 foreach($condition as $k=>$v){
                     $where.=$k."='".$v."' and ";
                 }
                 $where='where '.$where .'1=1';
             }
             $updatastr = '';
             if(!empty($data)){
                 foreach($data as $k=>$v){
                     $updatastr.= $k."='".$v."',";
                 }
                 $updatastr = 'set '.rtrim($updatastr,',');
             }
             self::$sql = "update {$table} {$updatastr} {$where}";
             return mysql_query(self::$sql);
         }
         /**
          * 删除记录
          */
          public function delete($table,$condition){
              $where='';
             if(!empty($condition)){

                 foreach($condition as $k=>$v){
                     $where.=$k."='".$v."' and ";
                 }
                 $where='where '.$where .'1=1';
             }
             self::$sql = "delete from {$table} {$where}";
             return mysql_query(self::$sql);

          }

         public static function getLastSql(){
             echo self::$sql;
         }
     }
    ?>

其他文件要操作数据的时候只要引用 require_once 'db.conn.smarty.php';就可以了。

 //require_once 'db.conn.smarty.php';
0 //$db = db::getInstance();
1 //$arr = array(9 => 'Tennis', 3 => 'Swimming', 8 => 'Coding');
 //$arr = $db->select('demo',array('password'=>'yujianqi2011'),array('username','age'));
 //echo $db->insert('demo',array('name'=>'最近你啦','password'=>'123'));
 //echo $db->update('demo',array("name"=>'xxx',"password"=>'123'),array('id'=>1));
5 //echo $db->delete('demo',array('id'=>'2'));
 //db::getLastSql();
 //echo $list;