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<?php
namespace Doctrine\DBAL\Schema;
use Doctrine\DBAL\Platforms\AbstractPlatform;
use Doctrine\DBAL\Schema\Visitor\CreateSchemaSqlCollector;
use Doctrine\DBAL\Schema\Visitor\DropSchemaSqlCollector;
use Doctrine\DBAL\Schema\Visitor\NamespaceVisitor;
use Doctrine\DBAL\Schema\Visitor\Visitor;
use function array_keys;
use function strpos;
use function strtolower;
/**
* Object representation of a database schema.
*
* Different vendors have very inconsistent naming with regard to the concept
* of a "schema". Doctrine understands a schema as the entity that conceptually
* wraps a set of database objects such as tables, sequences, indexes and
* foreign keys that belong to each other into a namespace. A Doctrine Schema
* has nothing to do with the "SCHEMA" defined as in PostgreSQL, it is more
* related to the concept of "DATABASE" that exists in MySQL and PostgreSQL.
*
* Every asset in the doctrine schema has a name. A name consists of either a
* namespace.local name pair or just a local unqualified name.
*
* The abstraction layer that covers a PostgreSQL schema is the namespace of an
* database object (asset). A schema can have a name, which will be used as
* default namespace for the unqualified database objects that are created in
* the schema.
*
* In the case of MySQL where cross-database queries are allowed this leads to
* databases being "misinterpreted" as namespaces. This is intentional, however
* the CREATE/DROP SQL visitors will just filter this queries and do not
* execute them. Only the queries for the currently connected database are
* executed.
*/
class Schema extends AbstractAsset
{
/**
* The namespaces in this schema.
*
* @var string[]
*/
private $namespaces = [];
/** @var Table[] */
protected $_tables = [];
/** @var Sequence[] */
protected $_sequences = [];
/** @var SchemaConfig */
protected $_schemaConfig;
/**
* @param Table[] $tables
* @param Sequence[] $sequences
* @param string[] $namespaces
*/
public function __construct(
array $tables = [],
array $sequences = [],
?SchemaConfig $schemaConfig = null,
array $namespaces = []
) {
if ($schemaConfig === null) {
$schemaConfig = new SchemaConfig();
}
$this->_schemaConfig = $schemaConfig;
$this->_setName($schemaConfig->getName() ?: 'public');
foreach ($namespaces as $namespace) {
$this->createNamespace($namespace);
}
foreach ($tables as $table) {
$this->_addTable($table);
}
foreach ($sequences as $sequence) {
$this->_addSequence($sequence);
}
}
/**
* @return bool
*/
public function hasExplicitForeignKeyIndexes()
{
return $this->_schemaConfig->hasExplicitForeignKeyIndexes();
}
/**
* @return void
*
* @throws SchemaException
*/
protected function _addTable(Table $table)
{
$namespaceName = $table->getNamespaceName();
$tableName = $table->getFullQualifiedName($this->getName());
if (isset($this->_tables[$tableName])) {
throw SchemaException::tableAlreadyExists($tableName);
}
if (
$namespaceName !== null
&& ! $table->isInDefaultNamespace($this->getName())
&& ! $this->hasNamespace($namespaceName)
) {
$this->createNamespace($namespaceName);
}
$this->_tables[$tableName] = $table;
$table->setSchemaConfig($this->_schemaConfig);
}
/**
* @return void
*
* @throws SchemaException
*/
protected function _addSequence(Sequence $sequence)
{
$namespaceName = $sequence->getNamespaceName();
$seqName = $sequence->getFullQualifiedName($this->getName());
if (isset($this->_sequences[$seqName])) {
throw SchemaException::sequenceAlreadyExists($seqName);
}
if (
$namespaceName !== null
&& ! $sequence->isInDefaultNamespace($this->getName())
&& ! $this->hasNamespace($namespaceName)
) {
$this->createNamespace($namespaceName);
}
$this->_sequences[$seqName] = $sequence;
}
/**
* Returns the namespaces of this schema.
*
* @return string[] A list of namespace names.
*/
public function getNamespaces()
{
return $this->namespaces;
}
/**
* Gets all tables of this schema.
*
* @return Table[]
*/
public function getTables()
{
return $this->_tables;
}
/**
* @param string $name
*
* @return Table
*
* @throws SchemaException
*/
public function getTable($name)
{
$name = $this->getFullQualifiedAssetName($name);
if (! isset($this->_tables[$name])) {
throw SchemaException::tableDoesNotExist($name);
}
return $this->_tables[$name];
}
/**
* @param string $name
*
* @return string
*/
private function getFullQualifiedAssetName($name)
{
$name = $this->getUnquotedAssetName($name);
if (strpos($name, '.') === false) {
$name = $this->getName() . '.' . $name;
}
return strtolower($name);
}
/**
* Returns the unquoted representation of a given asset name.
*
* @param string $assetName Quoted or unquoted representation of an asset name.
*
* @return string
*/
private function getUnquotedAssetName($assetName)
{
if ($this->isIdentifierQuoted($assetName)) {
return $this->trimQuotes($assetName);
}
return $assetName;
}
/**
* Does this schema have a namespace with the given name?
*
* @param string $name
*
* @return bool
*/
public function hasNamespace($name)
{
$name = strtolower($this->getUnquotedAssetName($name));
return isset($this->namespaces[$name]);
}
/**
* Does this schema have a table with the given name?
*
* @param string $name
*
* @return bool
*/
public function hasTable($name)
{
$name = $this->getFullQualifiedAssetName($name);
return isset($this->_tables[$name]);
}
/**
* Gets all table names, prefixed with a schema name, even the default one if present.
*
* @return string[]
*/
public function getTableNames()
{
return array_keys($this->_tables);
}
/**
* @param string $name
*
* @return bool
*/
public function hasSequence($name)
{
$name = $this->getFullQualifiedAssetName($name);
return isset($this->_sequences[$name]);
}
/**
* @param string $name
*
* @return Sequence
*
* @throws SchemaException
*/
public function getSequence($name)
{
$name = $this->getFullQualifiedAssetName($name);
if (! $this->hasSequence($name)) {
throw SchemaException::sequenceDoesNotExist($name);
}
return $this->_sequences[$name];
}
/**
* @return Sequence[]
*/
public function getSequences()
{
return $this->_sequences;
}
/**
* Creates a new namespace.
*
* @param string $name The name of the namespace to create.
*
* @return Schema This schema instance.
*
* @throws SchemaException
*/
public function createNamespace($name)
{
$unquotedName = strtolower($this->getUnquotedAssetName($name));
if (isset($this->namespaces[$unquotedName])) {
throw SchemaException::namespaceAlreadyExists($unquotedName);
}
$this->namespaces[$unquotedName] = $name;
return $this;
}
/**
* Creates a new table.
*
* @param string $name
*
* @return Table
*/
public function createTable($name)
{
$table = new Table($name);
$this->_addTable($table);
foreach ($this->_schemaConfig->getDefaultTableOptions() as $option => $value) {
$table->addOption($option, $value);
}
return $table;
}
/**
* Renames a table.
*
* @param string $oldName
* @param string $newName
*
* @return Schema
*/
public function renameTable($oldName, $newName)
{
$table = $this->getTable($oldName);
$table->_setName($newName);
$this->dropTable($oldName);
$this->_addTable($table);
return $this;
}
/**
* Drops a table from the schema.
*
* @param string $name
*
* @return Schema
*/
public function dropTable($name)
{
$name = $this->getFullQualifiedAssetName($name);
$this->getTable($name);
unset($this->_tables[$name]);
return $this;
}
/**
* Creates a new sequence.
*
* @param string $name
* @param int $allocationSize
* @param int $initialValue
*
* @return Sequence
*/
public function createSequence($name, $allocationSize = 1, $initialValue = 1)
{
$seq = new Sequence($name, $allocationSize, $initialValue);
$this->_addSequence($seq);
return $seq;
}
/**
* @param string $name
*
* @return Schema
*/
public function dropSequence($name)
{
$name = $this->getFullQualifiedAssetName($name);
unset($this->_sequences[$name]);
return $this;
}
/**
* Returns an array of necessary SQL queries to create the schema on the given platform.
*
* @return string[]
*/
public function toSql(AbstractPlatform $platform)
{
$sqlCollector = new CreateSchemaSqlCollector($platform);
$this->visit($sqlCollector);
return $sqlCollector->getQueries();
}
/**
* Return an array of necessary SQL queries to drop the schema on the given platform.
*
* @return string[]
*/
public function toDropSql(AbstractPlatform $platform)
{
$dropSqlCollector = new DropSchemaSqlCollector($platform);
$this->visit($dropSqlCollector);
return $dropSqlCollector->getQueries();
}
/**
* @return string[]
*/
public function getMigrateToSql(Schema $toSchema, AbstractPlatform $platform)
{
$comparator = new Comparator();
$schemaDiff = $comparator->compare($this, $toSchema);
return $schemaDiff->toSql($platform);
}
/**
* @return string[]
*/
public function getMigrateFromSql(Schema $fromSchema, AbstractPlatform $platform)
{
$comparator = new Comparator();
$schemaDiff = $comparator->compare($fromSchema, $this);
return $schemaDiff->toSql($platform);
}
/**
* @return void
*/
public function visit(Visitor $visitor)
{
$visitor->acceptSchema($this);
if ($visitor instanceof NamespaceVisitor) {
foreach ($this->namespaces as $namespace) {
$visitor->acceptNamespace($namespace);
}
}
foreach ($this->_tables as $table) {
$table->visit($visitor);
}
foreach ($this->_sequences as $sequence) {
$sequence->visit($visitor);
}
}
/**
* Cloning a Schema triggers a deep clone of all related assets.
*
* @return void
*/
public function __clone()
{
foreach ($this->_tables as $k => $table) {
$this->_tables[$k] = clone $table;
}
foreach ($this->_sequences as $k => $sequence) {
$this->_sequences[$k] = clone $sequence;
}
}
}