TYPO3 Core

• two MySQL databases used
  - t3_somedomain_de: _DEFAUL with TYPO3 stuff
  - ext_somedomain_de: externalDB with non-TYPO3 stuff (no uid, pid on tables, etc.)
• php.ini with enabled persistent connections

The first (persitent) connection works without any problems. But when a query to the externalDB is executed, the old link identifier of the _DEFAUL database will be "reused" for the externalDB. The next query of the regular TYPO3 database will fail (e.g. "ext_somedomain_de.pages" doesn't exist).

The kind of configuration used in localconf.php:

$TYPO3_CONF_VARS['EXTCONF']['dbal']['handlerCfg'] = array(
'_DEFAULT' => array(
'type' => 'native',
'config' => array(
'username' => '<user>',
'password' => '<pass>',
'host' => 'localhost',
'database' => 't3_somedomain_de',
)
),
'externalDB' => array(
'type' => 'native',
'config' => array(
'username' => '<user>',
'password' => '<pass>',
'host' => 'localhost',
'database' => 'ext_somedomain_de',
)
),
);

$TYPO3_CONF_VARS['EXTCONF']['dbal']['table2handlerKeys'] = array(
'Sometable_First' => 'externalDB',
'Sometable_Second' => 'externalDB',
'Sometable_Third' => 'externalDB',
);
(issue imported from #M5774)