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(at)freestart(dot)hu