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<?php
declare(strict_types=1);
namespace Doctrine\ORM\Query\Exec;
use Doctrine\DBAL\Connection;
use Doctrine\DBAL\Connections\PrimaryReadReplicaConnection;
use Doctrine\DBAL\Types\Type;
use Doctrine\ORM\Query\AST;
use Doctrine\ORM\Query\AST\DeleteStatement;
use Doctrine\ORM\Query\SqlWalker;
use Doctrine\ORM\Utility\PersisterHelper;
use Throwable;
use function array_reverse;
use function implode;
/**
* Executes the SQL statements for bulk DQL DELETE statements on classes in
* Class Table Inheritance (JOINED).
*
* @link http://www.doctrine-project.org
*/
class MultiTableDeleteExecutor extends AbstractSqlExecutor
{
private readonly string $createTempTableSql;
private readonly string $dropTempTableSql;
private readonly string $insertSql;
/**
* Initializes a new <tt>MultiTableDeleteExecutor</tt>.
*
* Internal note: Any SQL construction and preparation takes place in the constructor for
* best performance. With a query cache the executor will be cached.
*
* @param DeleteStatement $AST The root AST node of the DQL query.
* @param SqlWalker $sqlWalker The walker used for SQL generation from the AST.
*/
public function __construct(AST\Node $AST, SqlWalker $sqlWalker)
{
$em = $sqlWalker->getEntityManager();
$conn = $em->getConnection();
$platform = $conn->getDatabasePlatform();
$quoteStrategy = $em->getConfiguration()->getQuoteStrategy();
if ($conn instanceof PrimaryReadReplicaConnection) {
$conn->ensureConnectedToPrimary();
}
$primaryClass = $em->getClassMetadata($AST->deleteClause->abstractSchemaName);
$primaryDqlAlias = $AST->deleteClause->aliasIdentificationVariable;
$rootClass = $em->getClassMetadata($primaryClass->rootEntityName);
$tempTable = $platform->getTemporaryTableName($rootClass->getTemporaryIdTableName());
$idColumnNames = $rootClass->getIdentifierColumnNames();
$idColumnList = implode(', ', $idColumnNames);
// 1. Create an INSERT INTO temptable ... SELECT identifiers WHERE $AST->getWhereClause()
$sqlWalker->setSQLTableAlias($primaryClass->getTableName(), 't0', $primaryDqlAlias);
$insertSql = 'INSERT INTO ' . $tempTable . ' (' . $idColumnList . ')'
. ' SELECT t0.' . implode(', t0.', $idColumnNames);
$rangeDecl = new AST\RangeVariableDeclaration($primaryClass->name, $primaryDqlAlias);
$fromClause = new AST\FromClause([new AST\IdentificationVariableDeclaration($rangeDecl, null, [])]);
$insertSql .= $sqlWalker->walkFromClause($fromClause);
// Append WHERE clause, if there is one.
if ($AST->whereClause) {
$insertSql .= $sqlWalker->walkWhereClause($AST->whereClause);
}
$this->insertSql = $insertSql;
// 2. Create ID subselect statement used in DELETE ... WHERE ... IN (subselect)
$idSubselect = 'SELECT ' . $idColumnList . ' FROM ' . $tempTable;
// 3. Create and store DELETE statements
$classNames = [...$primaryClass->parentClasses, ...[$primaryClass->name], ...$primaryClass->subClasses];
foreach (array_reverse($classNames) as $className) {
$tableName = $quoteStrategy->getTableName($em->getClassMetadata($className), $platform);
$this->sqlStatements[] = 'DELETE FROM ' . $tableName
. ' WHERE (' . $idColumnList . ') IN (' . $idSubselect . ')';
}
// 4. Store DDL for temporary identifier table.
$columnDefinitions = [];
foreach ($idColumnNames as $idColumnName) {
$columnDefinitions[$idColumnName] = [
'name' => $idColumnName,
'notnull' => true,
'type' => Type::getType(PersisterHelper::getTypeOfColumn($idColumnName, $rootClass, $em)),
];
}
$this->createTempTableSql = $platform->getCreateTemporaryTableSnippetSQL() . ' ' . $tempTable . ' ('
. $platform->getColumnDeclarationListSQL($columnDefinitions) . ', PRIMARY KEY(' . implode(',', $idColumnNames) . '))';
$this->dropTempTableSql = $platform->getDropTemporaryTableSQL($tempTable);
}
/**
* {@inheritDoc}
*/
public function execute(Connection $conn, array $params, array $types): int
{
// Create temporary id table
$conn->executeStatement($this->createTempTableSql);
try {
// Insert identifiers
$numDeleted = $conn->executeStatement($this->insertSql, $params, $types);
// Execute DELETE statements
foreach ($this->sqlStatements as $sql) {
$conn->executeStatement($sql);
}
} catch (Throwable $exception) {
// FAILURE! Drop temporary table to avoid possible collisions
$conn->executeStatement($this->dropTempTableSql);
// Re-throw exception
throw $exception;
}
// Drop temporary table
$conn->executeStatement($this->dropTempTableSql);
return $numDeleted;
}
}
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