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begin_sql() now uses current storage engine info to know if transactions are going to work

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(only InnoDB detected as trasaction-able)
This commit is contained in:
stronk7 2009-09-09 16:01:31 +00:00
parent 3d6c36ff6e
commit dd67e10c8e
1 changed files with 16 additions and 1 deletions
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17
lib/dml/mysqli_native_moodle_database.php
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@ -1028,15 +1028,30 @@ class mysqli_native_moodle_database extends moodle_database {
* this is _very_ useful for massive updates
*/
public function begin_sql() {
// Only will accept transactions if using InnoDB storage engine (more engines can be added easily BDB, Falcon...)
$sql = "SELECT @@storage_engine";
$this->query_start($sql, NULL, SQL_QUERY_AUX);
$result = $this->mysqli->query($sql);
$this->query_end($result);
if ($rec = $result->fetch_assoc()) {
if (!in_array($rec['@@storage_engine'], array('InnoDB'))) {
return false;
}
} else {
return false;
}
$result->close();
if (!parent::begin_sql()) {
return false;
}
$sql = "SET SESSION TRANSACTION ISOLATION LEVEL READ COMMITTED";
$this->query_start($sql, NULL, SQL_QUERY_AUX);
$result = $this->mysqli->query($sql);
$this->query_end($result);
$sql = "BEGIN";
$sql = "START TRANSACTION";
$this->query_start($sql, NULL, SQL_QUERY_AUX);
$result = $this->mysqli->query($sql);
$this->query_end($result);