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标题: PHP基于单例模式实现的数据库操作基类 [打印本页]

作者: yj1281 时间: 2018-2-14 05:39

         本文实例讲述了PHP基于单例模式实现的数据库操作基类。分享给大家供大家参考，具体如下：
配置文件：
'localhost',
'user'=>'root',
'password'=>'',
'database'=>'test',
)
?>
php 数据库基类：
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;
};
}
/**
* 修改一条记录
*/
  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;
  }
}
$db = db::getInstance();
//$list = $db->select('demo',array('name'=>'tom','password'=>'ds'),array('name','password'));
//echo $db->insert('demo',array('name'=>'脚本之家','password'=>'123'));
//echo $db->update('demo',array("name"=>'xxx',"password"=>'123'),array('id'=>1));
echo $db->delete('demo',array('id'=>'2'));
db::getLastSql();
echo "";
?>
更多关于PHP操作数据库相关内容感兴趣的读者可查看本站专题：《php+mysql数据库操作入门教程》、《PHP基于pdo操作数据库技巧总结》及《php常见数据库操作技巧汇总》
希望本文所述对大家PHP程序设计有所帮助。


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