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<?php |
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declare(strict_types=1); |
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namespace Doctrine\DBAL\Sharding\SQLAzure\Schema; |
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use Doctrine\DBAL\Schema\Column; |
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use Doctrine\DBAL\Schema\ForeignKeyConstraint; |
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use Doctrine\DBAL\Schema\Index; |
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use Doctrine\DBAL\Schema\Schema; |
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use Doctrine\DBAL\Schema\Sequence; |
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use Doctrine\DBAL\Schema\Table; |
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use Doctrine\DBAL\Schema\Visitor\Visitor; |
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use RuntimeException; |
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use function in_array; |
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use function sprintf; |
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/** |
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* Converts a single tenant schema into a multi-tenant schema for SQL Azure |
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* Federations under the following assumptions: |
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* |
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* - Every table is part of the multi-tenant application, only explicitly |
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* excluded tables are non-federated. The behavior of the tables being in |
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* global or federated database is undefined. It depends on you selecting a |
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* federation before DDL statements or not. |
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* - Every Primary key of a federated table is extended by another column |
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* 'tenant_id' with a default value of the SQLAzure function |
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* `federation_filtering_value('tenant_id')`. |
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* - You always have to work with `filtering=On` when using federations with this |
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* multi-tenant approach. |
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* - Primary keys are either using globally unique ids (GUID, Table Generator) |
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* or you explicitly add the tenant_id in every UPDATE or DELETE statement |
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* (otherwise they will affect the same-id rows from other tenants as well). |
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* SQLAzure throws errors when you try to create IDENTIY columns on federated |
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* tables. |
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*/ |
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class MultiTenantVisitor implements Visitor |
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{ |
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/** @var string[] */ |
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private $excludedTables = []; |
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/** @var string */ |
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private $tenantColumnName; |
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/** @var string */ |
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private $tenantColumnType = 'integer'; |
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/** |
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* Name of the federation distribution, defaulting to the tenantColumnName |
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* if not specified. |
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* |
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* @var string |
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*/ |
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private $distributionName; |
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/** |
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* @param string[] $excludedTables |
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* @param string $tenantColumnName |
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* @param string|null $distributionName |
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*/ |
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public function __construct(array $excludedTables = [], $tenantColumnName = 'tenant_id', $distributionName = null) |
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{ |
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$this->excludedTables = $excludedTables; |
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$this->tenantColumnName = $tenantColumnName; |
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$this->distributionName = $distributionName ?: $tenantColumnName; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function acceptTable(Table $table) : void |
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{ |
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if (in_array($table->getName(), $this->excludedTables)) { |
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return; |
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} |
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$table->addColumn($this->tenantColumnName, $this->tenantColumnType, [ |
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'default' => "federation_filtering_value('" . $this->distributionName . "')", |
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]); |
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$clusteredIndex = $this->getClusteredIndex($table); |
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$indexColumns = $clusteredIndex->getColumns(); |
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$indexColumns[] = $this->tenantColumnName; |
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if ($clusteredIndex->isPrimary()) { |
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$table->dropPrimaryKey(); |
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$table->setPrimaryKey($indexColumns); |
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} else { |
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$table->dropIndex($clusteredIndex->getName()); |
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$table->addIndex($indexColumns, $clusteredIndex->getName()); |
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$table->getIndex($clusteredIndex->getName())->addFlag('clustered'); |
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} |
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} |
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/** |
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* @param Table $table |
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* |
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* @return Index |
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* |
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* @throws RuntimeException |
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*/ |
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private function getClusteredIndex($table) |
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{ |
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foreach ($table->getIndexes() as $index) { |
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if ($index->isPrimary() && ! $index->hasFlag('nonclustered')) { |
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return $index; |
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} |
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if ($index->hasFlag('clustered')) { |
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return $index; |
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} |
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} |
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throw new RuntimeException(sprintf('No clustered index found on table "%s".', $table->getName())); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function acceptSchema(Schema $schema) : void |
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{ |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function acceptColumn(Table $table, Column $column) : void |
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{ |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function acceptForeignKey(Table $localTable, ForeignKeyConstraint $fkConstraint) : void |
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{ |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function acceptIndex(Table $table, Index $index) : void |
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{ |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function acceptSequence(Sequence $sequence) : void |
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{ |
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} |
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} |
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doctrine /
dbal
