Re: Inserting Null Value or String Value

Hi Sean,

see below!

2002. október 1. 18:54 dátummal test test ezt írta:
| Hi,
|
| I am trying to insert a date into a date field, but also sometimes I
| need to insert a null value.  Inserting the null value seems to
| require not using quotes around null, but if I try to enter a date
| without quotes around it, it thinks it is a number.
|
| Here is the error I get: Warning: PostgreSQL query failed: ERROR:
| column "spec_start_date" is of type 'date' but expression is of type
| 'integer' You will need to rewrite or cast the expression
|
| The value I am sending is: spec_start_date = 10/01/02
|
| If I surround the date with single quotes it should be fine, but I
| can't do that when I want to insert a null value.  I know that I can
| do an "IF <use quotes> ELSE <don't use quotes>" in the SQL string, by
| I am entering many values and this would really get messy. I was
| hoping that there was a better solution. Thanks for any help.
|
| Sean
|

Beware crude hack is coming!!!

I wrote a fairly plain function which does the dirty quoting to any
kind of values to be inserted. It looks like:


function quote($var, $type, $empty_null = TRUE)
{
  if ( empty($var) && $empty_null ){
    return 'NULL';
  }
  // if type is prepended with _ it means "array of ..."
  if ( $type{0} == '_' ){
    $type = substr($type, 1);
    $temp = "'{";
    foreach ( $var as $item ){
      $temp .= quote($item, $type).','; // recursive call
    }
    $temp = substr($temp, 0, -1);
    return $temp ."}'";
  }
  switch ( $type ){
  case 'int':
    return intval($var);
  case 'bool':
    return ($var ? "'t'::bool": "'f'::bool");
  case 'date':
    if ( is_numeric($var) ) { // treats as timestamp integer
      return date("'Y-m-d'", $var);
    }
  // otherwise as a date string
  case 'text':
    if (!get_magic_quotes_gpc()) {
      $var = addslashes($var);
    }
    return '\''.$var.'\'';
  default: trigger_error("unknown type : $type ($value)", E_USER_ERROR);
  }
}

You must notice that $var holds the corresponding value to be inserted
or not set (in this case the function returns with NULL), $type is
neither a legal type from PHP nor from Postgresql, but I think you can
figure out how it works.

In my app, I have a PHP array which keeps information about what fields
needs to be inserted and what type these fields have.


$PROPERTIES = array (
'seatnum'     => 'int',
'myear'       => 'int',
'kmage'       => 'int',
'price'       => 'int',
'volume'      => 'int',
'power'       => 'int',
'pprpm'       => 'int',
'color'       => 'text',
'damaged'     => 'bool',
'condition'   => 'int',
'ownernum'    => 'int',
'regvalid'    => 'text',
'cylindernum' => 'int',
'cylinderarr' => 'int',
'gearnum'     => 'int',
'gearing'     => 'int',
'autoclutch'  => 'bool',
'truss'       => 'int',
'trussmaterial' => 'int',
'frontbreak'    => 'int',
'rarebreak'   => 'int',
'accessories' => '_int',
'notes'       => 'text'
);

finally I have to loop through this array  and simply calls quote to
quote the posted variables.

hth,
--
Papp, Győző
- pgerzson@freestart.hu