8000 [HttpFoundation] changed MERGE queries by hjkl · Pull Request #18501 · symfony/symfony · GitHub
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[HttpFoundation] changed MERGE queries #18501

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Merged
merged 1 commit into from
Jun 19, 2016
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[HttpFoundation] changed MERGE queries #18501

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Fixed oci and sqlsrv merge queries when emulation is disabled - fixes #… 
…17284
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@hjkl
hjkl committed Jun 18, 2016
commit ebf3a2ffc8e778b255bb4786f19dba8ae4100575
67 changes: 47 additions & 20 deletions src/Symfony/Component/HttpFoundation/Session/Storage/Handler/PdoSessionHandler.php
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Original file line number Diff line number Diff line change
Expand Up @@ -325,14 +325,8 @@ public function write($sessionId, $data)

try {
// We use a single MERGE SQL query when supported by the database.
$mergeSql = $this->getMergeSql();

if (null !== $mergeSql) {
$mergeStmt = $this->pdo->prepare($mergeSql);
$mergeStmt->bindParam(':id', $sessionId, \PDO::PARAM_STR);
$mergeStmt->bindParam(':data', $data, \PDO::PARAM_LOB);
$mergeStmt->bindParam(':lifetime', $maxlifetime, \PDO::PARAM_INT);
$mergeStmt->bindValue(':time', time(), \PDO::PARAM_INT);
$mergeStmt = $this->getMergeStatement($sessionId, $data, $maxlifetime);
if (null !== $mergeStmt) {
$mergeStmt->execute();

return true;
Expand Down Expand Up @@ -653,32 +647,65 @@ private function getSelectSql()
}

/**
* Returns a merge/upsert (i.e. insert or update) SQL query when supported by the database for writing session data.
* Returns a merge/upsert (i.e. insert or update) statement when supported by the database for writing session data.
*
* @return string|null The SQL string or null when not supported
* @param string $sessionId Session ID
* @param string $data Encoded session data
* @param int $maxlifetime session.gc_maxlifetime
*
* @return \PDOStatement|null The merge statement or null when not supported
*/
private function getMergeSql()
private function getMergeStatement($sessionId, $data, $maxlifetime)
{
$mergeSql = null;
switch (true) {
case 'mysql' === $this->driver:
return "INSERT INTO $this->table ($this->idCol, $this->dataCol, $this->lifetimeCol, $this->timeCol) VALUES (:id, :data, :lifetime, :time) ".
$mergeSql = "INSERT INTO $this->table ($this->idCol, $this->dataCol, $this->lifetimeCol, $this->timeCol) VALUES (:id, :data, :lifetime, :time) ".
"ON DUPLICATE KEY UPDATE $this->dataCol = VALUES($this->dataCol), $this->lifetimeCol = VALUES($this->lifetimeCol), $this->timeCol = VALUES($this->timeCol)";
break;
case 'oci' === $this->driver:
// DUAL is Oracle specific dummy table
return "MERGE INTO $this->table USING DUAL ON ($this->idCol = :id) ".
"WHEN NOT MATCHED THEN INSERT ($this->idCol, $this->dataCol, $this->lifetimeCol, $this->timeCol) VALUES (:id, :data, :lifetime, :time) ".
"WHEN MATCHED THEN UPDATE SET $this->dataCol = :data, $this->lifetimeCol = :lifetime, $this->timeCol = :time";
$mergeSql = "MERGE INTO $this->table USING DUAL ON ($this->idCol = ?) ".
"WHEN NOT MATCHED THEN INSERT ($this->idCol, $this->dataCol, $this->lifetimeCol, $this->timeCol) VALUES (?, ?, ?, ?) ".
"WHEN MATCHED THEN UPDATE SET $this->dataCol = ?, $this->lifetimeCol = ?, $this->timeCol = ?";
break;
case 'sqlsrv' === $this->driver && version_compare($this->pdo->getAttribute(\PDO::ATTR_SERVER_VERSION), '10', '>='):
// MERGE is only available since SQL Server 2008 and must be terminated by semicolon
// It also requires HOLDLOCK according to http://weblogs.sqlteam.com/dang/archive/2009/01/31/UPSERT-Race-Condition-With-MERGE.aspx
return "MERGE INTO $this->table WITH (HOLDLOCK) USING (SELECT 1 AS dummy) AS src ON ($this->idCol = :id) ".
"WHEN NOT MATCHED THEN INSERT ($this->idCol, $this->dataCol, $this->lifetimeCol, $this->timeCol) VALUES (:id, :data, :lifetime, :time) ".
"WHEN MATCHED THEN UPDATE SET $this->dataCol = :data, $this->lifetimeCol = :lifetime, $this->timeCol = :time;";
$mergeSql = "MERGE INTO $this->table WITH (HOLDLOCK) USING (SELECT 1 AS dummy) AS src ON ($this->idCol = ?) ".
"WHEN NOT MATCHED THEN INSERT ($this->idCol, $this->dataCol, $this->lifetimeCol, $this->timeCol) VALUES (?, ?, ?, ?) ".
"WHEN MATCHED THEN UPDATE SET $this->dataCol = ?, $this->lifetimeCol = ?, $this->timeCol = ?;";
break;
case 'sqlite' === $this->driver:
return "INSERT OR REPLACE INTO $this->table ($this->idCol, $this->dataCol, $this->lifetimeCol, $this->timeCol) VALUES (:id, :data, :lifetime, :time)";
$mergeSql = "INSERT OR REPLACE INTO $this->table ($this->idCol, $this->dataCol, $this->lifetimeCol, $this->timeCol) VALUES (:id, :data, :lifetime, :time)";
break;
case 'pgsql' === $this->driver && version_compare($this->pdo->getAttribute(\PDO::ATTR_SERVER_VERSION), '9.5', '>='):
return "INSERT INTO $this->table ($this->idCol, $this->dataCol, $this->lifetimeCol, $this->timeCol) VALUES (:id, :data, :lifetime, :time) ".
$mergeSql = "INSERT INTO $this->table ($this->idCol, $this->dataCol, $this->lifetimeCol, $this->timeCol) VALUES (:id, :data, :lifetime, :time) ".
"ON CONFLICT ($this->idCol) DO UPDATE SET ($this->dataCol, $this->lifetimeCol, $this->timeCol) = (EXCLUDED.$this->dataCol, EXCLUDED.$this->lifetimeCol, EXCLUDED.$this->timeCol)";
break;
}

if (null !== $mergeSql) {
$mergeStmt = $this->pdo->prepare($mergeSql);

if ('sqlsrv' === $this->driver || 'oci' === $this->driver) {
$mergeStmt->bindParam(1, $sessionId, \PDO::PARAM_STR);
$mergeStmt->bindParam(2, $sessionId, \PDO::PARAM_STR);
$mergeStmt->bindParam(3, $data, \PDO::PARAM_LOB);
$mergeStmt->bindParam(4, $maxlifetime, \PDO::PARAM_INT);
$mergeStmt->bindValue(5, time(), \PDO::PARAM_INT);
$mergeStmt->bindParam(6, $data, \PDO::PARAM_LOB);
$mergeStmt->bindParam(7, $maxlifetime, \PDO::PARAM_INT);
$mergeStmt->bindValue(8, time(), \PDO::PARAM_INT);
}
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@phansys phansys Jun 19, 2016

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@hjkl, could you please submit another PR fixing this minor CS issue? Thank you in advance.

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@hjkl hjkl Jun 19, 2016

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@phansys sure, I can't see the coding standards issue though, could you please clarify for me?

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@phansys phansys Jun 19, 2016

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Sure @hjkl, I refer to PSR-2 5.1:

} else {

Thank you.

else {
$mergeStmt->bindParam(':id', $sessionId, \PDO::PARAM_STR);
$mergeStmt->bindParam(':data', $data, \PDO::PARAM_LOB);
$mergeStmt->bindParam(':lifetime', $maxlifetime, \PDO::PARAM_INT);
$mergeStmt->bindValue(':time', time(), \PDO::PARAM_INT);
}

return $mergeStmt;
}
}

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