动态网页技术PHP通过参数来生成MYSQL语句类

动态网页技术PHP通过参数来生成MYSQL语句类(7)    }
   function clear_all_assign()
   {
   $this -> Result = null ;
   $this -> ResultSearch = null ;
   $this -> ResultLeftJoin = null ;
   $this -> Result = null ;
   $this -> Tables = Array ();
   $this -> Values = Array ();
   $this -> Fields = Array ();
   $this -> Conditions = Array ();
   $this -> Condition = null ;
   $this -> LeftJoin = Array ();
   $this -> Sort = " ASC " ;
   $this -> Order = null ;
   $this -> Search = null ;
   $this -> fieldSQL = null ;
   $this -> valueSQL = null ;
   $this -> partSQL = null ;
   $this -> Error = null ;
   return true ;
   }
   function CombineFieldValue( $manual = false )
   {
   $funct = " CombineFieldsPostVar " ;
   $className = get_class ( $this );
   $fields = $this -> getFields();
   $values = $this -> getValues();
   if ( ! is_array ( $fields ))
   {
   $this -> Error = " $className::$funct \nVariable fields not Array " ;
   return ;
   }
   if ( ! is_array ( $values ))
   {
   $this -> Error = " $className::$funct \nVariable values not Array " ;
   return ;
   }
   if ( count ( $fields ) != count ( $values ))
   {
   $this -> Error = " $className::$funct \nCount of fields and values not match " ;
   return ;
   }
   for ( $i = 0 ; $i < count ( $fields ); $i ++ )
   {
   @ $this -> fieldSQL .= $fields [ $i ] . " , " ;