fix(dbal): Move migrator away from deprecated calls

Signed-off-by: Joas Schilling <[email protected]>

lib/private/DB/Migrator.php

@@ -31,7 +31,6 @@
 use Doctrine\DBAL\Exception;
 use Doctrine\DBAL\Platforms\MySQLPlatform;
 use Doctrine\DBAL\Schema\AbstractAsset;
-use Doctrine\DBAL\Schema\Comparator;
 use Doctrine\DBAL\Schema\Schema;
 use Doctrine\DBAL\Schema\SchemaDiff;
 use Doctrine\DBAL\Types\StringType;
@@ -75,7 +74,7 @@ public function generateChangeScript(Schema $targetSchema) {
 		$schemaDiff = $this->getDiff($targetSchema, $this->connection);
 
 		$script = '';
-		$sqls = $schemaDiff->toSql($this->connection->getDatabasePlatform());
+		$sqls = $this->connection->getDatabasePlatform()->getAlterSchemaSQL($schemaDiff);
 		foreach ($sqls as $sql) {
 			$script .= $this->convertStatementToScript($sql);
 		}
@@ -95,18 +94,18 @@ public function createSchema() {
 			}
 			return preg_match($filterExpression, $asset) === 1;
 		});
-		return $this->connection->getSchemaManager()->createSchema();
+		return $this->connection->createSchemaManager()->introspectSchema();
 	}
 
 	/**
 	 * @return SchemaDiff
 	 */
 	protected function getDiff(Schema $targetSchema, Connection $connection) {
-		// adjust varchar columns with a length higher then getVarcharMaxLength to clob
+		// adjust varchar columns with a length higher than getVarcharMaxLength to clob
 		foreach ($targetSchema->getTables() as $table) {
 			foreach ($table->getColumns() as $column) {
 				if ($column->getType() instanceof StringType) {
-					if ($column->getLength() > $connection->getDatabasePlatform()->getVarcharMaxLength()) {
+					if ($column->getLength() > 4000) {
 						$column->setType(Type::getType('text'));
 						$column->setLength(null);
 					}
@@ -122,7 +121,7 @@ protected function getDiff(Schema $targetSchema, Connection $connection) {
 			}
 			return preg_match($filterExpression, $asset) === 1;
 		});
-		$sourceSchema = $connection->getSchemaManager()->createSchema();
+		$sourceSchema = $connection->createSchemaManager()->introspectSchema();
 
 		// remove tables we don't know about
 		foreach ($sourceSchema->getTables() as $table) {
@@ -137,9 +136,8 @@ protected function getDiff(Schema $targetSchema, Connection $connection) {
 			}
 		}
 
-		/** @psalm-suppress InternalMethod */
-		$comparator = new Comparator();
-		return $comparator->compare($sourceSchema, $targetSchema);
+		$comparator = $connection->createSchemaManager()->createComparator();
+		return $comparator->compareSchemas($sourceSchema, $targetSchema);
 	}
 
 	/**
@@ -155,7 +153,7 @@ protected function applySchema(Schema $targetSchema, Connection $connection = nu
 		if (!$connection->getDatabasePlatform() instanceof MySQLPlatform) {
 			$connection->beginTransaction();
 		}
-		$sqls = $schemaDiff->toSql($connection->getDatabasePlatform());
+		$sqls = $connection->getDatabasePlatform()->getAlterSchemaSQL($schemaDiff);
 		$step = 0;
 		foreach ($sqls as $sql) {
 			$this->emit($sql, $step++, count($sqls));
@@ -178,7 +176,7 @@ protected function convertStatementToScript($statement) {
 	}
 
 	protected function getFilterExpression() {
-		return '/^' . preg_quote($this->config->getSystemValueString('dbtableprefix', 'oc_')) . '/';
+		return '/^' . preg_quote($this->config->getSystemValueString('dbtableprefix', 'oc_'), '/') . '/';
 	}
 
 	protected function emit(string $sql, int $step, int $max): void {