如何从数据库中查找特定日期是否位于两个日期之间？

Question

<?php

 $hostname = "localhost";
 $db_user = "root";  
 $db_password = "";  
 $database = "rentcar";  
 $db_table = "reservation"; 

 $db = mysql_connect($hostname, $db_user, $db_password); 

 mysql_select_db($database,$db);

 $date1 = $_POST['datepicker1'];

 $date2 = $_POST['datepicker2'];


 $start_date = strtotime($date1);

 $end_date = strtotime($date2);

 $query  =  mysql_query("SELECT * FROM reservation WHERE  ('pudate'>".$start_date." AND         
 'dodate'<".$end_date.") OR ('pudate'<".$start_date." AND 'dodate'>".$end_date." ) OR 
  ('pudate'<".$end_date." AND 'dodate'>".$end_date.") OR ('pudate'<".$start_date." AND 
  'dodate'>".$start_date." )");

 $result = mysql_query($query); 

  if ($result) 

 {
   echo "vehicle is available";
 }

 else
 {
 echo "vehicle is not available";    

  }

 ?>

the pudate and dodate are the dates in the database. When i try to run it always show me the output as vehicle is not available. I m running the query st check whether the car is already booked between two these days if the car is already booked it will say the car is not available but no matter how i try to run the query it always give me the same result.

Answer 1

You failed to pick up the actual result of the query. Actually, you are call mysql_query() twice (which returns a handle ). In your case, use mysql_num_rows() to fetch the amount of rows, which should tell you if the vehicle is available or not.

Answer 2

The problem is that you are not correctly processing the results of your query. To fix this, you can try something like this:

$result =  mysql_query("SELECT * FROM reservation WHERE  ('pudate'>".$start_date." AND         
  'dodate'<".$end_date.") OR ('pudate'<".$start_date." AND 'dodate'>".$end_date." ) OR 
  ('pudate'<".$end_date." AND 'dodate'>".$end_date.") OR ('pudate'<".$start_date." AND 
  'dodate'>".$start_date." )");

while ($row = mysql_fetch_array($result, MYSQL_NUM)) {
    //$row contains the results of your query  
}