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MDL-17491 oci native driver - now supporting db locks (hence db sessions)

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stronk7 2009-10-08 14:39:58 +00:00
parent 265eaf365f
commit 08559d7de0
1 changed files with 55 additions and 1 deletions
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56
lib/dml/oci_native_moodle_database.php
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@ -47,6 +47,8 @@ class oci_native_moodle_database extends moodle_database {
private $last_error_reporting; // To handle oci driver default verbosity
private $unique_session_id; // To store unique_session_id. Needed for temp tables unique naming
private $dblocks_supported = null; // To cache locks support along the connection life
/**
* Detects if all needed PHP stuff installed.
@ -1471,7 +1473,59 @@ class oci_native_moodle_database extends moodle_database {
}
/// session locking
// http://download.oracle.com/docs/cd/B10501_01/appdev.920/a96612/d_lock2.htm#999576
public function session_lock_supported() {
if (isset($this->dblocks_supported)) { // Use cached value if available
return $this->dblocks_supported;
}
$sql = "SELECT 1
FROM user_objects
WHERE object_type = 'PACKAGE BODY'
AND object_name = 'MOODLE_LOCKS'
AND status = 'VALID'";
$this->query_start($sql, null, SQL_QUERY_AUX);
$stmt = $this->parse_query($sql);
$result = oci_execute($stmt, $this->commit_status);
$this->query_end($result, $stmt);
$records = null;
oci_fetch_all($stmt, $records, 0, -1, OCI_FETCHSTATEMENT_BY_ROW);
oci_free_statement($stmt);
$this->dblocks_supported = isset($records[0]) && reset($records[0]) ? true : false;
return $this->dblocks_supported;;
}
public function get_session_lock($rowid) {
if (!$this->session_lock_supported()) {
return;
}
parent::get_session_lock($rowid);
$fullname = $this->dbname.'-'.$this->prefix.'-session-'.$rowid;
$sql = 'SELECT MOODLE_LOCKS.GET_LOCK(:lockname, :locktimeout) FROM DUAL';
$params = array('lockname' => $fullname , 'locktimeout' => 120);
$this->query_start($sql, $params, SQL_QUERY_AUX);
$stmt = $this->parse_query($sql);
$this->bind_params($stmt, $params);
$result = oci_execute($stmt, $this->commit_status);
$this->query_end($result, $stmt);
oci_free_statement($stmt);
}
public function release_session_lock($rowid) {
if (!$this->session_lock_supported()) {
return;
}
parent::release_session_lock($rowid);
$fullname = $this->dbname.'-'.$this->prefix.'-session-'.$rowid;
$params = array('lockname' => $fullname);
$sql = 'SELECT MOODLE_LOCKS.RELEASE_LOCK(:lockname) FROM DUAL';
$this->query_start($sql, $params, SQL_QUERY_AUX);
$stmt = $this->parse_query($sql);
$this->bind_params($stmt, $params);
$result = oci_execute($stmt, $this->commit_status);
$this->query_end($result, $stmt);
oci_free_statement($stmt);
}
/// transactions
/**