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Filtering Database Between a Max and Min with decimals

Discussion in 'PHP' started by mnymkr, Sep 5, 2008.

  1. #1
    I am looking for a secure php / sql statement to filter a database between a min and max number

    i want to make sure and doesn't deliver errors if a person does or does not use a decimal and if they enter a higher number for min

    thanks!
     
    mnymkr, Sep 5, 2008 IP
  2. jayshah

    jayshah Peon

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    #2
    http://www.php.net/is_numeric will check the inputs are numeric for you. If you don't do, echo mysql_error(); in your code, the user would never see the SQL errors (if any).

    Jay
     
    jayshah, Sep 5, 2008 IP
  3. mnymkr

    mnymkr Well-Known Member

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    #3
    is that sufficient to inject into a sql query

    what would be the proper query?
     
    mnymkr, Sep 5, 2008 IP
  4. jayshah

    jayshah Peon

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    #4
    Something like ...

    $min = 123.45;
    $max = 567.89;
    
    $min = mysql_real_escape_string($min);
    $max = mysql_real_escape_string($max);
    $query = "SELECT * FROM `table` WHERE `min` > $min AND `max` < $max";
    $result = mysql_query($query);
    // ... Continue processing here ...
    
    PHP:
    Jay
     
    jayshah, Sep 5, 2008 IP
  5. mnymkr

    mnymkr Well-Known Member

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    #5
    should i use is_numeric with that?
     
    mnymkr, Sep 5, 2008 IP
  6. jayshah

    jayshah Peon

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    #6
    If you want to test the data before you query the database with it, yes.

    Jay
     
    jayshah, Sep 5, 2008 IP
  7. mnymkr

    mnymkr Well-Known Member

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    #7
    sorry i mean, where should i use is_numeric in the script above?
     
    mnymkr, Sep 5, 2008 IP
  8. jayshah

    jayshah Peon

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    #8
    After the values for $min and $max have been set, before mysql_real_escape_string.

    Jay
     
    jayshah, Sep 5, 2008 IP
  9. JAY6390

    JAY6390 Peon

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    #9
    $min = 123.45;
    $max = 567.89;
    
    if(is_numeric($min) && is_numeric($max))
    {
        $query = "SELECT * FROM `table` WHERE `min` > $min AND `max` < $max";
        $result = mysql_query($query);
        // ... Continue processing here ...
    }else{
        //ERROR CODE TO GO HERE
    }
    
    PHP:
    NOTE: If you use is_numeric() on the two values you will not need to escape the data with mysql_real_escape_string()
     
    JAY6390, Sep 5, 2008 IP