Gemeinschaft Lernen Tools-Bibliothek Freizeit
suchen
Deutsch
Heim > php教程 > php手册 > php实战第五天

php实战第五天

WBOY
Freigeben： 2016-06-13 10:57:12
Original
1136 Leute haben es durchsucht

php单态设计模式，我的理解，类中创建静态变量，使其只有一个，使用方法进行返回对象，该方法 检查对象是存在不存在就创建。从而实现单一对象。

将__construct()设置为private这样就new不了咯.self是本类的意思。“::”调用静态方法

 

 


[php]      /**
    * 
    */ 
    class myclass 
    { 
        static private $db_class; 
        static public function getClass() 
        { 
            if (is_null(self::$db_class)) { 
                self::$db_class=new myclass(); 
                echo "创建对象咯"; 
            }else{ 
                echo "返回原来的对象"; 
                return self::$db_class; 
            } 
        } 
        private function __construct() 
        { 
            echo "11111111111111"; 
        } 
 
        public function __destruct(){ 
            echo "
aaaaaaaaaaaa"; 
        } 
        public function show(){ 
            echo "bbbbbbbbbbbbbbb"; 
        } 
    } 
    $a=myclass::getClass(); 
    $a=myclass::getClass(); 
    $a=myclass::getClass(); 
    $a=myclass::getClass(); 
    $a=myclass::getClass(); 
    $a=myclass::getClass(); 
    $a=myclass::getClass(); 
    $a=myclass::getClass(); 
    $a=myclass::getClass(); 
    $a=myclass::getClass(); 
    $a->show(); 
 
 
    /*//直接new 会报错的噢!!!
    new myclass();
    new myclass();
 
    new myclass();
    new myclass();
 
    new myclass();
    new myclass();
    new myclass();
    new myclass();*/ 
 ?> 

 /**
 *
 */
 class myclass
 {
  static private $db_class;
  static public function getClass()
  {
   if (is_null(self::$db_class)) {
    self::$db_class=new myclass();
    echo "创建对象咯";
   }else{
    echo "返回原来的对象";
    return self::$db_class;
   }
  }
  private function __construct()
  {
   echo "11111111111111";
  }

  public function __destruct(){
   echo "
aaaaaaaaaaaa";
  }
  public function show(){
   echo "bbbbbbbbbbbbbbb";
  }
 }
 $a=myclass::getClass();
 $a=myclass::getClass();
 $a=myclass::getClass();
 $a=myclass::getClass();
 $a=myclass::getClass();
 $a=myclass::getClass();
 $a=myclass::getClass();
 $a=myclass::getClass();
 $a=myclass::getClass();
 $a=myclass::getClass();
 $a->show();


 /*//直接new 会报错的噢!!!
 new myclass();
 new myclass();

 new myclass();
 new myclass();

 new myclass();
 new myclass();
 new myclass();
 new myclass();*/
 ?>

 

 

 

 

 

 

这个是小例子.下面给出 单态的 mysql类


[php]  // +----------------------------------------------------------------------  
// |MySQL操作类  
// +----------------------------------------------------------------------  
// |@微凉 QQ:496928838  
// +----------------------------------------------------------------------  
class MySQL{ 
     
    private $db_mysql_hostname; 
    private $db_mysql_username; 
    private $db_mysql_password; 
    private $db_mysql_database; 
    private $db_mysql_port; 
    private $db_mysql_charset; 
     
    private $query_list = array(); 
     
    //查询次数  
    public $query_count = 0; 
    //查询开始时间  
    public $query_start_time; 
     
    //当前查询ID  
    protected $queryID; 
    //当前连接  
    protected $conn; 
    // 事务指令数  
    protected $transTimes = 0; 
    // 返回或者影响记录数  
    protected $numRows    = 0; 
    // 错误信息  
    protected $error      = ''; 
     
    //静态实例  
    static private $db_class; 
    //取得本类  
    static public function getClass() 
    { 
      if (is_null(self::$db_class)) { 
            self::$db_class=new MySQL(); 
        } 
        return self::$db_class; 
    } 
 
    //定义为私有方法就new起来咯,要用 getClass  
    private function __construct() 
    { 
             
    } 
 
 
    public function connect($hostname_or_conf,$username,$password,$database,$port = '3306',$char = 'utf8'){ 
        if(is_array($hostname_or_conf)){ 
            $this->db_mysql_hostname = $hostname_or_conf['hostname']; 
            $this->db_mysql_username = $hostname_or_conf['username']; 
            $this->db_mysql_password = $hostname_or_conf['password']; 
            $this->db_mysql_database = $hostname_or_conf['database']; 
            $this->db_mysql_port = isset($hostname_or_conf['port'])?$hostname_or_conf['port']:'3306'; 
            $this->db_mysql_charset = isset($hostname_or_conf['charset'])?$hostname_or_conf['charset']:'utf8'; 
        }elseif(!empty($hostname_or_conf)||!empty($username)||!empty($password)||!empty($database)) 
        { 
             $this->db_mysql_hostname = $hostname_or_conf; 
             $this->db_mysql_username = $username; 
             $this->db_mysql_password = $password; 
             $this->db_mysql_database = $database; 
             $this->db_mysql_port = $port; 
             $this->db_mysql_charset = $char; 
              
        }else{ 
            die('configuration error.'); 
        } 
         
        $server = $this->db_mysql_hostname.':'.$this->db_mysql_port; 
        $this->conn = mysql_connect($server,$this->db_mysql_username,$this->db_mysql_password,true) or die('Connect MySQL DB error!'); 
        mysql_select_db($this->db_mysql_database,$this->conn) or die('select db error!'); 
        mysql_query("set names " . $this->db_mysql_charset, $this->conn); 
 
    } 
 
 
 
 
    /**
     +----------------------------------------------------------
     * 设置数据对象值
     +----------------------------------------------------------
     * @access public
     +----------------------------------------------------------
     *table,where,order,limit,data,field,join,group,having
     +----------------------------------------------------------
     */ 
    public function table($table){ 
        $this->query_list['table'] = $table; 
        return $this; 
    } 
     
    public function where($where){ 
        $this->query_list['where'] = $where; 
        return $this; 
    } 
     
    public function order($order){ 
        $this->query_list['order'] = $order; 
        return $this; 
    } 
     
    public function limit($offset,$length=null){ 
        if (is_null($length)) { 
            $this->query_list['limit']='limit '.$offset; 
            return $this; 
        }else { 
            if(!isset($length)){ 
                $length = $offset; 
                $offset = 0; 
            } 
                $this->query_list['limit'] = 'limit '.$offset.','.$length; 
                return $this; 
        } 
 
    } 
     
    public function data($data){ 
        //读取数据表字段,然后处理表单数据  
        $dataList = $this->getFields($this->query_list['table']); 
        $arr=array(); 
        foreach ($dataList as $key=>$value) { 
            if (array_key_exists ($key,$data) ) { 
                $arr[$key]=$data[$key]; 
            } 
             
        } 
        //var_dump($arr);  
        /*
        if(is_object($data)){
            $data   =   get_object_vars($data);
        }elseif (is_string($data)){
            parse_str($data,$data);
        }elseif(!is_array($data)){
            //Log:DATA_TYPE_INVALID
        }
        */ 
        $this->query_list['data'] = $arr; 
        return $this; 
    } 
    public function field($fields){ 
        $this->query_list['fields'] = $fields; 
        return $this; 
    } 
    public function join($join){ 
        $this->query_list['join'] = $join; 
        return $this; 
    } 
    public function group($group){ 
        $this->query_list['group'] = $group; 
        return $this; 
    } 
    public function having($having){ 
        $this->query_list['having'] = $having; 
        return $this; 
    } 
    /**
     +----------------------------------------------------------
     * 查询
     +----------------------------------------------------------
     * @access public
     +----------------------------------------------------------
     * @param 
     +----------------------------------------------------------
     */ 
    public function select(){ 
        $select_sql = 'select '; 
        $fields = isset($this->query_list['fields'])?$this->query_list['fields']:'*'; 
        $select_sql.=$fields; 
        $select_sql.= ' from `'.$this->query_list['table'].'` '; 
         
        isset($this->query_list['join'])?($select_sql.=$this->query_list['join']):''; 
        isset($this->query_list['where'])?($select_sql.=' where '.$this->query_list['where']):''; 
        isset($this->query_list['group'])?($select_sql.=' group by'.$this->query_list['group']):''; 
        isset($this->query_list['having'])?($select_sql.=' mysql having '.$this->query_list['having']):''; 
        isset($this->query_list['order'])?($select_sql.=' order by '.$this->query_list['order']):''; 
        isset($this->query_list['limit'])?($select_sql.=' '.$this->query_list['limit']):''; 
    //  echo '----->'.$select_sql;  
        return $this->query($select_sql); 
    } 
    /**
     +----------------------------------------------------------
     * 增加
     +----------------------------------------------------------
     * @access public
     +----------------------------------------------------------
     * @param 
     +----------------------------------------------------------
     */ 
    public function add(){ 
        $add_sql = 'insert into `'.$this->query_list['table'].'` ('; 
         
        $data = $this->query_list['data']; 
        $value = $field = ''; 
        foreach($data as $k=>$v){ 
            $field .= '`'.$k.'`,'; 
            if(is_numeric($v)) 
                $value .= $v.','; 
            else 
                $value .= '\''.$v.'\','; 
        } 
        $add_sql .= rtrim($field,',').') values ('.rtrim($value,',').')'; 
 
    //  echo 'add_sql'.$add_sql;  
        return $this->execute($add_sql); 
    } 
    /**
     +----------------------------------------------------------
     * 删除
     +----------------------------------------------------------
     * @access public
     +----------------------------------------------------------
     * @param 
     +----------------------------------------------------------
     */ 
    public function delete(){ 
        $del_sql = 'delete from `'.$this->query_list['table'].'` where '.$this->query_list['where']; 
         
        if(isset($this->query_list['order'])) 
            $del_sql .= 'order by '.$this->query_list['order']; 
        if(isset($this->query_list['limit'])) 
            $del_sql .= ' '.$this->query_list['limit']; 
             
        return $this->execute($del_sql); 
         
    } 
    /**
     +----------------------------------------------------------
     * 更新
     +----------------------------------------------------------
     * @access public
     +----------------------------------------------------------
     * @param 
     +----------------------------------------------------------
     */ 
    public function update(){ 
        $update_sql = 'update `'.$this->query_list['table'].'` set '; 
        $data = $this->query_list['data']; 
         
        foreach($data as $k=>$v){ 
            if(is_numeric($v)) 
                $update_sql .= '`'.$k.'` ='.$v.','; 
            else 
                $update_sql .= '`'.$k.'` =\''.$v.'\','; 
        } 
        $update_sql = rtrim($update_sql,','); 
        if(isset($this->query_list['where'])) 
            $update_sql .= ' where '.$this->query_list['where']; 
        if(isset($this->query_list['order'])) 
            $update_sql .= ' order by '.$this->query_list['order']; 
        if(isset($this->query_list['limit'])) 
            $update_sql .= ' '.$this->query_list['limit']; 
         
        return $this->execute($update_sql); 
         
    } 
     /**
     +----------------------------------------------------------
     * 执行查询 返回数据集
     +----------------------------------------------------------
     * @access public
     +----------------------------------------------------------
     * @param string $sql  sql指令
     */ 
    public function query($sql) { 
        if ( !$this->conn ) return false; 
        $this->queryStr = $sql; 
        //释放前次的查询结果  
        if ( $this->queryID ) {    $this->free();    } 
         
        $this->query_start_time = microtime(true); 
         
        $this->queryID = mysql_query($sql, $this->conn); 
        $this->query_count++; 
        if ( false === $this->queryID ) { 
            $this->error(); 
            return false; 
        } else { 
            $this->numRows = mysql_num_rows($this->queryID); 
            return $this->getAll(); 
        } 
    } 
    /**
     +----------------------------------------------------------
     * 执行语句
     +----------------------------------------------------------
     * @access public
     +----------------------------------------------------------
     * @param string $sql  sql指令
     +----------------------------------------------------------
     */ 
    public function execute($sql) { 
        if ( !$this->conn ) return false; 
        $this->queryStr = $sql; 
        //释放前次的查询结果  
        if ( $this->queryID ) {    $this->free();    } 
         
        $this->query_start_time = microtime(true); 
         
        $result =   mysql_query($sql, $this->conn) ; 
        $this->query_count++; 
        if ( false === $result) { 
            $this->error(); 
            return false; 
        } else { 
            $this->numRows = mysql_affected_rows($this->conn); 
            return $this->numRows; 
        } 
    } 
    /**
     +----------------------------------------------------------
     * 获得所有的查询数据
     +----------------------------------------------------------
     * @access private
     +----------------------------------------------------------
     * @return array
     */ 
    private function getAll() { 
        //返回数据集  
        $result = array(); 
        if($this->numRows >0) { 
            while($row = mysql_fetch_assoc($this->queryID)){ 
                $result[]   =   $row; 
            } 
            mysql_data_seek($this->queryID,0); 
        } 
        return $result; 
    } 
    /**
     +----------------------------------------------------------
     * 取得数据表的字段信息
     +----------------------------------------------------------
     * @access public
     +----------------------------------------------------------
     */ 
    public function getFields($tableName) { 
        $result =   $this->query('SHOW COLUMNS FROM `'.$tableName.'`'); 
        $info   =   array(); 
        if($result) { 
            foreach ($result as $key => $val) { 
                $info[$val['Field']] = array( 
                    'name'    => $val['Field'], 
                    'type'    => $val['Type'], 
                    'notnull' => (bool) ($val['Null'] === ''), // not null is empty, null is yes  
                    'default' => $val['Default'], 
                    'primary' => (strtolower($val['Key']) == 'pri'), 
                    'autoinc' => (strtolower($val['Extra']) == 'auto_increment'), 
                ); 
            } 
        } 
        return $info; 
    } 
    /**
     +----------------------------------------------------------
     * 取得数据库的表信息
     +----------------------------------------------------------
     * @access public
     +----------------------------------------------------------
     */ 
    public function getTables($dbName='') { 
        if(!empty($dbName)) { 
           $sql    = 'SHOW TABLES FROM '.$dbName; 
        }else{ 
           $sql    = 'SHOW TABLES '; 
        } 
        $result =   $this->query($sql); 
        $info   =   array(); 
        foreach ($result as $key => $val) { 
            $info[$key] = current($val); 
        } 
        return $info; 
    } 
 
    /**
     +----------------------------------------------------------
     * 最后次操作的ID
     +----------------------------------------------------------
     * @access public
     +----------------------------------------------------------
     * @param 
     +----------------------------------------------------------
     */ 
     public function last_insert_id(){ 
        return mysql_insert_id($this->conn); 
    } 
    /**
     * 执行一条带有结果集计数的
     */ 
    public function count($sql){ 
        return $this->execute($sql); 
    } 
    /**
     +----------------------------------------------------------
     * 启动事务
     +----------------------------------------------------------
     * @access public
     +----------------------------------------------------------
     * @return void
     +----------------------------------------------------------
     */ 
    public function startTrans() { 
        if ($this->transTimes == 0) { 
            mysql_query('START TRANSACTION', $this->conn); 
        } 
        $this->transTimes++; 
        return ; 
    } 
 
    /**
     +----------------------------------------------------------
     * 提交事务
     +----------------------------------------------------------
     * @access public
     +----------------------------------------------------------
     * @return boolen
     +----------------------------------------------------------
     */ 
    public function commit() 
    { 
        if ($this->transTimes > 0) { 
            $result = mysql_query('COMMIT', $this->conn); 
            $this->transTimes = 0; 
            if(!$result){ 
                throw new Exception($this->error()); 
            } 
        } 
        return true; 
    } 
 
    /**
     +----------------------------------------------------------
     * 事务回滚
     +----------------------------------------------------------
     * @access public
     +----------------------------------------------------------
     * @return boolen
     +----------------------------------------------------------
     */ 
    public function rollback() 
    { 
        if ($this->transTimes > 0) { 
            $result = mysql_query('ROLLBACK', $this->conn); 
            $this->transTimes = 0; 
            if(!$result){ 
                throw new Exception($this->error()); 
            } 
        } 
        return true; 
    } 
    /**
     +----------------------------------------------------------
     * 错误信息
     +----------------------------------------------------------
     * @access public
     +----------------------------------------------------------
     * @param 
     +----------------------------------------------------------
     */ 
     public function error() { 
        $this->error = mysql_error($this->conn); 
        if('' != $this->queryStr){ 
            $this->error .= "\n [ SQL语句 ] : ".$this->queryStr; 
        } 
        return $this->error; 
    } 
    /**
     +----------------------------------------------------------
     * 释放查询结果
     +----------------------------------------------------------
     * @access public
     +----------------------------------------------------------
     */ 
    public function free() { 
        @mysql_free_result($this->queryID); 
        $this->queryID = 0; 
        $this->query_list = null; 
    } 
    /**
     +----------------------------------------------------------
     * 关闭连接
     +----------------------------------------------------------
     * @access public
     +----------------------------------------------------------
     * @param 
     +----------------------------------------------------------
     */ 
    function close(){ 
        if ($this->conn && !mysql_close($this->conn)){ 
            throw new Exception($this->error()); 
        } 
        $this->conn = 0; 
        $this->query_count = 0; 
    } 
    /**
     +----------------------------------------------------------
     * 析构方法
     +----------------------------------------------------------
     * @access public
     +----------------------------------------------------------
     */ 
    function __destruct(){ 
         $this->close(); 
    } 
} 

// +----------------------------------------------------------------------
// |MySQL操作类
// +----------------------------------------------------------------------
// |@微凉 QQ:496928838
// +----------------------------------------------------------------------
class MySQL{
 
 private $db_mysql_hostname;
 private $db_mysql_username;
 private $db_mysql_password;
 private $db_mysql_database;
 private $db_mysql_port;
 private $db_mysql_charset;
 
 private $query_list = array();
 
 //查询次数
 public $query_count = 0;
 //查询开始时间
 public $query_start_time;
 
 //当前查询ID
 protected $queryID;
 //当前连接
 protected $conn;
 // 事务指令数
 protected $transTimes = 0;
 // 返回或者影响记录数
    protected $numRows    = 0;
    // 错误信息
    protected $error      = '';
 
    //静态实例
    static private $db_class;
    //取得本类
    static public function getClass()
    {
      if (is_null(self::$db_class)) {
            self::$db_class=new MySQL();
        }
        return self::$db_class;
    }

    //定义为私有方法就new起来咯,要用 getClass
    private function __construct()
    {
           
    }


    public function connect($hostname_or_conf,$username,$password,$database,$port = '3306',$char = 'utf8'){
        if(is_array($hostname_or_conf)){
            $this->db_mysql_hostname = $hostname_or_conf['hostname'];
            $this->db_mysql_username = $hostname_or_conf['username'];
            $this->db_mysql_password = $hostname_or_conf['password'];
            $this->db_mysql_database = $hostname_or_conf['database'];
            $this->db_mysql_port = isset($hostname_or_conf['port'])?$hostname_or_conf['port']:'3306';
            $this->db_mysql_charset = isset($hostname_or_conf['charset'])?$hostname_or_conf['charset']:'utf8';
        }elseif(!empty($hostname_or_conf)||!empty($username)||!empty($password)||!empty($database))
        {
             $this->db_mysql_hostname = $hostname_or_conf;
             $this->db_mysql_username = $username;
             $this->db_mysql_password = $password;
             $this->db_mysql_database = $database;
             $this->db_mysql_port = $port;
             $this->db_mysql_charset = $char;
            
        }else{
            die('configuration error.');
        }
       
        $server = $this->db_mysql_hostname.':'.$this->db_mysql_port;
        $this->conn = mysql_connect($server,$this->db_mysql_username,$this->db_mysql_password,true) or die('Connect MySQL DB error!');
        mysql_select_db($this->db_mysql_database,$this->conn) or die('select db error!');
        mysql_query("set names " . $this->db_mysql_charset, $this->conn);

    }

 


 /**
     +----------------------------------------------------------
     * 设置数据对象值
     +----------------------------------------------------------
     * @access public
     +----------------------------------------------------------
     *table,where,order,limit,data,field,join,group,having
     +----------------------------------------------------------
     */
 public function table($table){
  $this->query_list['table'] = $table;
  return $this;
 }
 
 public function where($where){
  $this->query_list['where'] = $where;
  return $this;
 }
 
 public function order($order){
  $this->query_list['order'] = $order;
  return $this;
 }
 
 public function limit($offset,$length=null){
  if (is_null($length)) {
   $this->query_list['limit']='limit '.$offset;
   return $this;
  }else {
   if(!isset($length)){
    $length = $offset;
    $offset = 0;
   }
    $this->query_list['limit'] = 'limit '.$offset.','.$length;
    return $this;
  }

 }
 
 public function data($data){
  //读取数据表字段,然后处理表单数据
  $dataList = $this->getFields($this->query_list['table']);
  $arr=array();
  foreach ($dataList as $key=>$value) {
   if (array_key_exists ($key,$data) ) {
    $arr[$key]=$data[$key];
   }
   
  }
  //var_dump($arr);
  /*
  if(is_object($data)){
   $data   =   get_object_vars($data);
  }elseif (is_string($data)){
   parse_str($data,$data);
  }elseif(!is_array($data)){
   //Log:DATA_TYPE_INVALID
  }
  */
  $this->query_list['data'] = $arr;
  return $this;
 }
 public function field($fields){
  $this->query_list['fields'] = $fields;
  return $this;
 }
 public function join($join){
  $this->query_list['join'] = $join;
  return $this;
 }
 public function group($group){
  $this->query_list['group'] = $group;
  return $this;
 }
 public function having($having){
  $this->query_list['having'] = $having;
  return $this;
 }
 /**
     +----------------------------------------------------------
     * 查询
     +----------------------------------------------------------
     * @access public
     +----------------------------------------------------------
     * @param
     +----------------------------------------------------------
     */
 public function select(){
  $select_sql = 'select ';
  $fields = isset($this->query_list['fields'])?$this->query_list['fields']:'*';
  $select_sql.=$fields;
  $select_sql.= ' from `'.$this->query_list['table'].'` ';
  
  isset($this->query_list['join'])?($select_sql.=$this->query_list['join']):'';
  isset($this->query_list['where'])?($select_sql.=' where '.$this->query_list['where']):'';
  isset($this->query_list['group'])?($select_sql.=' group by'.$this->query_list['group']):'';
  isset($this->query_list['having'])?($select_sql.=' mysql having '.$this->query_list['having']):'';
  isset($this->query_list['order'])?($select_sql.=' order by '.$this->query_list['order']):'';
  isset($this->query_list['limit'])?($select_sql.=' '.$this->query_list['limit']):'';
 // echo '----->'.$select_sql;
  return $this->query($select_sql);
 }
 /**
     +----------------------------------------------------------
     * 增加
     +----------------------------------------------------------
     * @access public
     +----------------------------------------------------------
     * @param
     +----------------------------------------------------------
     */
 public function add(){
  $add_sql = 'insert into `'.$this->query_list['table'].'` (';
  
  $data = $this->query_list['data'];
  $value = $field = '';
  foreach($data as $k=>$v){
   $field .= '`'.$k.'`,';
   if(is_numeric($v))
    $value .= $v.',';
   else
    $value .= '\''.$v.'\',';
  }
  $add_sql .= rtrim($field,',').') values ('.rtrim($value,',').')';

 // echo 'add_sql'.$add_sql;
  return $this->execute($add_sql);
 }
 /**
     +----------------------------------------------------------
     * 删除
     +----------------------------------------------------------
     * @access public
     +----------------------------------------------------------
     * @param
     +----------------------------------------------------------
     */
 public function delete(){
  $del_sql = 'delete from `'.$this->query_list['table'].'` where '.$this->query_list['where'];
  
  if(isset($this->query_list['order']))
   $del_sql .= 'order by '.$this->query_list['order'];
  if(isset($this->query_list['limit']))
   $del_sql .= ' '.$this->query_list['limit'];
   
  return $this->execute($del_sql);
  
 }
 /**
     +----------------------------------------------------------
     * 更新
     +----------------------------------------------------------
     * @access public
     +----------------------------------------------------------
     * @param
     +----------------------------------------------------------
     */
 public function update(){
  $update_sql = 'update `'.$this->query_list['table'].'` set ';
  $data = $this->query_list['data'];
  
  foreach($data as $k=>$v){
   if(is_numeric($v))
    $update_sql .= '`'.$k.'` ='.$v.',';
   else
    $update_sql .= '`'.$k.'` =\''.$v.'\',';
  }
  $update_sql = rtrim($update_sql,',');
  if(isset($this->query_list['where']))
   $update_sql .= ' where '.$this->query_list['where'];
  if(isset($this->query_list['order']))
   $update_sql .= ' order by '.$this->query_list['order'];
  if(isset($this->query_list['limit']))
   $update_sql .= ' '.$this->query_list['limit'];
  
  return $this->execute($update_sql);
  
 }
  /**
     +----------------------------------------------------------
     * 执行查询 返回数据集
     +----------------------------------------------------------
     * @access public
     +----------------------------------------------------------
     * @param string $sql  sql指令
     */
    public function query($sql) {
        if ( !$this->conn ) return false;
        $this->queryStr = $sql;
        //释放前次的查询结果
        if ( $this->queryID ) {    $this->free();    }
       
        $this->query_start_time = microtime(true);
       
        $this->queryID = mysql_query($sql, $this->conn);
        $this->query_count++;
        if ( false === $this->queryID ) {
            $this->error();
            return false;
        } else {
            $this->numRows = mysql_num_rows($this->queryID);
            return $this->getAll();
        }
    }
 /**
     +----------------------------------------------------------
     * 执行语句
     +----------------------------------------------------------
     * @access public
     +----------------------------------------------------------
     * @param string $sql  sql指令
     +----------------------------------------------------------
     */
    public function execute($sql) {
        if ( !$this->conn ) return false;
        $this->queryStr = $sql;
        //释放前次的查询结果
        if ( $this->queryID ) {    $this->free();    }
       
        $this->query_start_time = microtime(true);
       
        $result =   mysql_query($sql, $this->conn) ;
        $this->query_count++;
        if ( false === $result) {
            $this->error();
            return false;
        } else {
            $this->numRows = mysql_affected_rows($this->conn);
            return $this->numRows;
        }
    }
 /**
     +----------------------------------------------------------
     * 获得所有的查询数据
     +----------------------------------------------------------
     * @access private
     +----------------------------------------------------------
     * @return array
     */
    private function getAll() {
        //返回数据集
        $result = array();
        if($this->numRows >0) {
            while($row = mysql_fetch_assoc($this->queryID)){
                $result[]   =   $row;
            }
            mysql_data_seek($this->queryID,0);
        }
        return $result;
    }
 /**
     +----------------------------------------------------------
     * 取得数据表的字段信息
     +----------------------------------------------------------
     * @access public
     +----------------------------------------------------------
     */
    public function getFields($tableName) {
        $result =   $this->query('SHOW COLUMNS FROM `'

Verwandte Etiketten：
php 使用方法 创建 变量 天 实战 理解 设计模式 进行 静态
Quelle：php.cn
Vorheriger Artikel：php实战第十一天 Nächster Artikel：php实战第十二天
Erklärung dieser Website
Der Inhalt dieses Artikels wird freiwillig von Internetnutzern beigesteuert und das Urheberrecht liegt beim ursprünglichen Autor. Diese Website übernimmt keine entsprechende rechtliche Verantwortung. Wenn Sie Inhalte finden, bei denen der Verdacht eines Plagiats oder einer Rechtsverletzung besteht, wenden Sie sich bitte an admin@php.cn
Neueste Artikel des Autors
Aktuelle Ausgaben
Aus URL-Parametern erhaltene PHP-Arrays verhalten sich nicht wie erwartet Ich habe einen URL-Parameter, der die Kategorie-ID enthält, und ich möchte ihn als Array w...
Aus 2024-04-06 22:09:02
0
1
1428
Wo soll ich die CustomLog-Direktive in Apache platzieren? Ich verwende php:7.2-apachedocker. Ich muss das URL-Anmeldezugriffsprotokoll zur Gesundhei...
Aus 2024-04-06 22:03:59
0
1
990
Welches Format haben die Variablen im Rückgabewert? Ich bin ein PHP-Neuling. Ich habe einen Code gefunden: if($x<time()){return[false,'erro...
Aus 2024-04-06 21:55:20
0
1
778
Bei der Verwendung von opentbs zum Generieren von ODT-Dateien sind Probleme aufgetreten: Werte desselben Schlüssels werden in derselben Zeile statt in separaten Spalten angezeigt. Ich verwende eine Bibliothek namens OpenTbs, um ODT mit PHP zu erstellen. Ich verwende sie...
Aus 2024-04-06 20:18:18
0
1
483
Gruppieren Sie MySQL-Ergebnisse nach ID für die Schleife Ich habe eine Tabelle mit Flugdaten in MySQL. Ich schreibe einen PHP-Code, der Daten mithi...
Aus 2024-04-06 17:27:56
0
1
406
verwandte Themen
Mehr>
Beliebte Empfehlungen
Beliebte Tutorials
Mehr>
Verwandte Tutorials
Beliebte Empfehlungen
Aktuelle Kurse
Neueste Downloads
Mehr>
Web-Effekte
Quellcode der Website
Website-Materialien
Frontend-Vorlage