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Bug #21186 Can not connect to Informix with DB::connect
Submitted: 2002-12-26 01:16 UTC Modified: 2003-01-03 06:04 UTC
Avg. Score:5.0 ± 0.0
Reproduced:1 of 1 (100.0%)
Same Version:0 (0.0%)
Same OS:0 (0.0%)
From: ckongsak at hotmail dot com Assigned:
Status: Closed Package: PEAR related
PHP Version: 4.2.3 OS: linux (redhat 7.0)
Private report: No CVE-ID: None
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 [2002-12-26 01:16 UTC] ckongsak at hotmail dot com
When I try to use informix module in PEAR package. And I see that some code is wrong.

this below is a source code for generate error.
$db = DB::connect($dsn, true);
if (DB::isError($db)) {
    die(__FILE__ . ':' . __LINE__ . ' => ' . $db->getMessage());

this is a output about of the source code.
test.php:40 => DBError: no such database

After if i investigate in ifx.php, in connect function is wrong (may be)
below is a current source code (ifx.php, v1.5)
        if ((!DB::assertExtension('informix')) || (!DB::assertExtension('Informix'))) {
            return $this->raiseError(DB_ERROR_EXTENSION_NOT_FOUND);

Condition in if statement should use "&&" instead of "||".


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 [2003-01-01 16:32 UTC]
If assertExtension() fails, PEAR::DB will return DB_ERROR_EXTENSION_NOT_FOUND. But in your example, PEAR::DB returned DB_ERROR_NOSUCHDB. This means that the connection to the server could be established, but that the database was not found.

The reason for this is that the DSN, you're using, contains a database name that does not exist.
 [2003-01-01 21:54 UTC] ckongsak at hotmail dot com
First: About error code and message

I add the following code to the first line of method 'DB_ifx::connect'.
return $this->raiseError(DB_ERROR_EXTENSION_NOT_FOUND);
This means immediately return method DB_ifx::connect with error DB_ERROR_EXTENSION_NOT_FOUND.
And display test.php again.  Output of test.php is ...
test.php:40 => DB Error: no such database
So something goes wrong here.
Because error code and message don't match. The message should be "extension not found".

To investigate more about this issue, I add the code "print_r($db)" to show the contents of error object.  Output is ...
db_error Object ( [error_message_prefix] => [mode] => 1 [level] => 1024 [code] => -25 [message] => DB Error: no such database [userinfo] => ifx://test:test@test/test [callback] => )
test.php:41 => DB Error: no such database
Developer can clearly see that code is -25 but message is "DB Error: no such database".

Should I submit another Bug report about this issue ?

Second: About if statement in DB_ifx::connect
Thiks about following expression.
$a || $b
Meaning of this expression is "TRUE if either $a or $b is TRUE".
Ok ?

So following if statement appeard in DB_ifx::connect.
if ((!DB::assertExtension('informix')) ||
(!DB::assertExtension('Informix'))) {
  return $this->raiseError(DB_ERROR_EXTENSION_NOT_FOUND);
If system have two extension 'informix' and 'Informix', don't return with error.  But if system has only 'informix' or 'Informix' extension (not both), return with error.  Because one of DB::assertExtension() returns false and logical not change it's value to true.

What is the developer intention for above if statement ?
To use informix, system should have both 'informix' and 'Informix' extension ?

My system have only one extension 'Informix'.  So above condition is not met and return with error DB_ERROR_EXTENSION_NOT_FOUND. 
Is this a intended behavior ?
 [2003-01-03 06:04 UTC]
You are right about the second issue. A fix for this has been commited to CVS and will appear in the next release of PEAR::DB.

I suggest you file a new bug report for the first issue, so we can keep track of it more easily.
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