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<?php declare(strict_types=1); |
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/** |
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* @copyright (c) 2017-present brian ridley |
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* @author brian ridley <[email protected]> |
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* @license http://opensource.org/licenses/MIT MIT |
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*/ |
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namespace ptlis\GrepDb\Metadata\MySQL; |
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use Doctrine\DBAL\Connection; |
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/** |
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* Factory that builds server, database & table metadata. |
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*/ |
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final class MetadataFactory |
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{ |
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/** |
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* Query the server and build server metadata DTO. |
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*/ |
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public function getServerMetadata( |
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Connection $connection |
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) { |
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// Attempt to list databases, ignoring internal databases |
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try { |
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$statement = $connection->query('SHOW DATABASES WHERE `Database` NOT IN ("information_schema", "performance_schema", "sys", "mysql");'); |
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} catch (\Throwable $e) { |
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throw new \RuntimeException('Failed to list databases: ' . $e->getMessage()); |
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} |
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$databaseMetadataList = []; |
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/** @var string $databaseName */ |
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while ($databaseName = $statement->fetchColumn(0)) { |
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$databaseMetadataList[] = $this->getDatabaseMetadata($connection, $databaseName); |
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} |
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return new ServerMetadata($connection->getHost(), $databaseMetadataList); |
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} |
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/** |
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* Query the server and build database metadata DTO. |
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*/ |
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public function getDatabaseMetadata( |
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Connection $connection, |
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string $databaseName |
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): DatabaseMetadata { |
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// Get a list of table names |
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$tableNameStatement = $connection |
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->createQueryBuilder() |
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->select([ |
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'tables.TABLE_NAME AS name' |
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]) |
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->from('information_schema.TABLES', 'tables') |
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->where('TABLE_SCHEMA = :schema') |
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->andWhere('TABLE_TYPE = "BASE TABLE"') |
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->setParameter('schema', $databaseName) |
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->execute(); |
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// Build table metadata |
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$tableMetadataList = []; |
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while ($tableName = $tableNameStatement->fetchColumn(0)) { |
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$tableMetadataList[] = $this->getTableMetadata($connection, $databaseName, $tableName); |
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} |
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return new DatabaseMetadata($databaseName, $tableMetadataList); |
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} |
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/** |
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* Query the server and build table metadata DTO. |
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*/ |
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public function getTableMetadata( |
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Connection $connection, |
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string $databaseName, |
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string $tableName |
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): TableMetadata { |
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// Get top-level table information |
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$tableStatement = $connection |
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->createQueryBuilder() |
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->select([ |
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'tables.TABLE_NAME AS name', |
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'tables.ENGINE AS engine', |
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'tables.TABLE_COLLATION AS collation', |
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'tables.TABLE_ROWS AS row_count', |
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'charset.CHARACTER_SET_NAME AS charset' |
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]) |
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->from('information_schema.TABLES', 'tables') |
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->leftJoin( |
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'tables', |
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'information_schema.COLLATION_CHARACTER_SET_APPLICABILITY', |
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'charset', |
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'tables.TABLE_COLLATION = charset.COLLATION_NAME' |
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) |
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->where('TABLE_NAME = :table_name') |
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->setParameter('table_name', $tableName) |
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->execute(); |
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$tableRow = $tableStatement->fetch(\PDO::FETCH_ASSOC); |
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// Get column information |
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$columnsStatement = $connection |
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->createQueryBuilder() |
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->select([ |
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'columns.COLUMN_NAME AS name', |
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'columns.COLUMN_TYPE AS type', |
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'columns.CHARACTER_MAXIMUM_LENGTH AS max_length', |
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'"PRI" = columns.COLUMN_KEY AS is_primary_key', |
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'"YES" = columns.IS_NULLABLE AS is_nullable', |
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'( |
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SELECT COUNT(*) |
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FROM INFORMATION_SCHEMA.STATISTICS |
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WHERE TABLE_SCHEMA = :schema |
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AND TABLE_NAME = :table_name |
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AND COLUMN_NAME = columns.COLUMN_NAME |
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) AS is_indexed' |
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]) |
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->from('information_schema.COLUMNS', 'columns') |
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->where('TABLE_SCHEMA = :schema') |
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->andWhere('TABLE_NAME = :table_name') |
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->setParameters([ |
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'schema' => $databaseName, |
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'table_name' => $tableName |
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]) |
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->execute(); |
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// Build column metadata |
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$columnMetadataList = []; |
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foreach ($columnsStatement->fetchAll(\PDO::FETCH_ASSOC) as $columnsRow) { |
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$columnMetadataList[] = new ColumnMetadata( |
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$databaseName, |
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$tableName, |
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$columnsRow['name'], |
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$columnsRow['type'], |
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is_null($columnsRow['max_length']) ? null : intval($columnsRow['max_length']), |
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boolval($columnsRow['is_primary_key']), |
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boolval($columnsRow['is_nullable']), |
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boolval($columnsRow['is_indexed']) |
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); |
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} |
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return new TableMetadata( |
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$databaseName, |
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$tableName, |
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$tableRow['engine'], |
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$tableRow['collation'], |
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$tableRow['charset'], |
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intval($tableRow['row_count']), |
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$columnMetadataList |
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); |
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} |
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} |
ptlis /
grep-db
