db-connections and destructors (bug?)
| From: | Erik Hjortsberg | Date: | Sun, 15 Jul 2001 00:23:00 +0000 |
| Subject: | db-connections and destructors (bug?) | ||
| Groups: | php.pear.dev | ||
| Request: | Send a blank email to pear-dev+get-784@lists.php.net to get a copy of this message | ||
There seems to be some kind of bug with mysql-connections and the shutdown-function in php 4.0.5 (which is used by PEAR's destructor function). Apparently the connection is broken, although it is not clear how.
I'm trying to do a management-system for database-objects where the changes made to the objects may be sent to the database at the end of script execution (thereby avoiding a lot of single "update..."-statements).
The problem is that all queries at that time seems to abort the script without returning a Error-object. It appears as if the mysql_query() function just silently dies. Since there can be no output at script-execution end one must put debug info in the session.
Given you have a $db-object this code can be used to test this:
<code>
session_start();
session_register('inScriptResult');
session_register('atEndResult');
session_register('inScriptDb');
session_register('atEndDb');
$GLOBALS['inScriptDb'] = $GLOBALS['db']->toString();
$GLOBALS['inScriptResult'] = $GLOBALS['db']->getOne('show tables');
function test() {
$GLOBALS['atEndDb'] = $GLOBALS['db']->toString();
$GLOBALS['atEnd'] = $GLOBALS['db']->getOne('show tables');
}
register_shutdown_function("test");
</code>
The resulting session-string is:
inScriptResult|s:10:"aTable";!atEndResult|inScriptDb|s:53:"db_mysql: (phptype=mysql, dbsyntax=mysql) [connected]";atEndDb|s:53:"db_mysql: (phptype=mysql, dbsyntax=mysql) [connected]";
Anyone else having this problem?
And on another note, perhaps there should be a mention in the Db-documentation about the problems with mySql's use of existing connections?
<code>
$db1 = Db::connect("mysql://user:passw@localhost/db1");
$db2 = Db::connect("mysql://user:passw@localhost/db2");
</code>
Because we're using the same username and the same password on the same box php will make $db2 take over $db1's connection. Thus calls to $db1 will most surely result in error as it's pointing to database 'db2'.
More info can be found at http://www.php.net/manual/en/function.mysql-connect.php .
A possible solution is:
<code>
$db1 = Db::connect("mysql://user:passw@localhost/db1");
$db2 = Db::connect("mysql://user:passw@127.0.0.1/db2");
</code>
/erik hjortsberg