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<?php
/**
* @link http://www.yiiframework.com/
* @copyright Copyright (c) 2008 Yii Software LLC
* @license http://www.yiiframework.com/license/
*/
namespace yii\db;
use Yii;
use yii\base\BaseObject;
use yii\base\InvalidCallException;
use yii\base\InvalidConfigException;
use yii\base\NotSupportedException;
use yii\caching\Cache;
use yii\caching\CacheInterface;
use yii\caching\TagDependency;
use yii\helpers\StringHelper;
/**
* Schema is the base class for concrete DBMS-specific schema classes.
*
* Schema represents the database schema information that is DBMS specific.
*
* @property string $lastInsertID The row ID of the last row inserted, or the last value retrieved from the
* sequence object. This property is read-only.
* @property QueryBuilder $queryBuilder The query builder for this connection. This property is read-only.
* @property string[] $schemaNames All schema names in the database, except system schemas. This property is
* read-only.
* @property string $serverVersion Server version as a string. This property is read-only.
* @property string[] $tableNames All table names in the database. This property is read-only.
* @property TableSchema[] $tableSchemas The metadata for all tables in the database. Each array element is an
* instance of [[TableSchema]] or its child class. This property is read-only.
* @property string $transactionIsolationLevel The transaction isolation level to use for this transaction.
* This can be one of [[Transaction::READ_UNCOMMITTED]], [[Transaction::READ_COMMITTED]],
* [[Transaction::REPEATABLE_READ]] and [[Transaction::SERIALIZABLE]] but also a string containing DBMS specific
* syntax to be used after `SET TRANSACTION ISOLATION LEVEL`. This property is write-only.
*
* @author Qiang Xue <qiang.xue@gmail.com>
* @author Sergey Makinen <sergey@makinen.ru>
* @since 2.0
*/
abstract class Schema extends BaseObject
{
// The following are the supported abstract column data types.
const TYPE_PK = 'pk';
const TYPE_UPK = 'upk';
const TYPE_BIGPK = 'bigpk';
const TYPE_UBIGPK = 'ubigpk';
const TYPE_CHAR = 'char';
const TYPE_STRING = 'string';
const TYPE_TEXT = 'text';
const TYPE_TINYINT = 'tinyint';
const TYPE_SMALLINT = 'smallint';
const TYPE_INTEGER = 'integer';
const TYPE_BIGINT = 'bigint';
const TYPE_FLOAT = 'float';
const TYPE_DOUBLE = 'double';
const TYPE_DECIMAL = 'decimal';
const TYPE_DATETIME = 'datetime';
const TYPE_TIMESTAMP = 'timestamp';
const TYPE_TIME = 'time';
const TYPE_DATE = 'date';
const TYPE_BINARY = 'binary';
const TYPE_BOOLEAN = 'boolean';
const TYPE_MONEY = 'money';
const TYPE_JSON = 'json';
/**
* Schema cache version, to detect incompatibilities in cached values when the
* data format of the cache changes.
*/
const SCHEMA_CACHE_VERSION = 1;
/**
* @var Connection the database connection
*/
public $db;
/**
* @var string the default schema name used for the current session.
*/
public $defaultSchema;
/**
* @var array map of DB errors and corresponding exceptions
* If left part is found in DB error message exception class from the right part is used.
*/
public $exceptionMap = [
'SQLSTATE[23' => 'yii\db\IntegrityException',
];
/**
* @var string|array column schema class or class config
* @since 2.0.11
*/
public $columnSchemaClass = 'yii\db\ColumnSchema';
/**
* @var string|string[] character used to quote schema, table, etc. names.
* An array of 2 characters can be used in case starting and ending characters are different.
* @since 2.0.14
*/
protected $tableQuoteCharacter = "'";
/**
* @var string|string[] character used to quote column names.
* An array of 2 characters can be used in case starting and ending characters are different.
* @since 2.0.14
*/
protected $columnQuoteCharacter = '"';
/**
* @var array list of ALL schema names in the database, except system schemas
*/
private $_schemaNames;
/**
* @var array list of ALL table names in the database
*/
private $_tableNames = [];
/**
* @var array list of loaded table metadata (table name => metadata type => metadata).
*/
private $_tableMetadata = [];
/**
* @var QueryBuilder the query builder for this database
*/
private $_builder;
/**
* @var string server version as a string.
*/
private $_serverVersion;
/**
* Resolves the table name and schema name (if any).
* @param string $name the table name
* @return TableSchema [[TableSchema]] with resolved table, schema, etc. names.
* @throws NotSupportedException if this method is not supported by the DBMS.
* @since 2.0.13
*/
protected function resolveTableName($name)
{
throw new NotSupportedException(get_class($this) . ' does not support resolving table names.');
}
/**
* Returns all schema names in the database, including the default one but not system schemas.
* This method should be overridden by child classes in order to support this feature
* because the default implementation simply throws an exception.
* @return array all schema names in the database, except system schemas.
* @throws NotSupportedException if this method is not supported by the DBMS.
* @since 2.0.4
*/
protected function findSchemaNames()
{
throw new NotSupportedException(get_class($this) . ' does not support fetching all schema names.');
}
/**
* Returns all table names in the database.
* This method should be overridden by child classes in order to support this feature
* because the default implementation simply throws an exception.
* @param string $schema the schema of the tables. Defaults to empty string, meaning the current or default schema.
* @return array all table names in the database. The names have NO schema name prefix.
* @throws NotSupportedException if this method is not supported by the DBMS.
*/
protected function findTableNames($schema = '')
{
throw new NotSupportedException(get_class($this) . ' does not support fetching all table names.');
}
/**
* Loads the metadata for the specified table.
* @param string $name table name
* @return TableSchema|null DBMS-dependent table metadata, `null` if the table does not exist.
*/
abstract protected function loadTableSchema($name);
/**
* Creates a column schema for the database.
* This method may be overridden by child classes to create a DBMS-specific column schema.
* @return ColumnSchema column schema instance.
* @throws InvalidConfigException if a column schema class cannot be created.
*/
protected function createColumnSchema()
{
return Yii::createObject($this->columnSchemaClass);
}
/**
* Obtains the metadata for the named table.
* @param string $name table name. The table name may contain schema name if any. Do not quote the table name.
* @param bool $refresh whether to reload the table schema even if it is found in the cache.
* @return TableSchema|null table metadata. `null` if the named table does not exist.
*/
public function getTableSchema($name, $refresh = false)
{
return $this->getTableMetadata($name, 'schema', $refresh);
}
/**
* Returns the metadata for all tables in the database.
* @param string $schema the schema of the tables. Defaults to empty string, meaning the current or default schema name.
* @param bool $refresh whether to fetch the latest available table schemas. If this is `false`,
* cached data may be returned if available.
* @return TableSchema[] the metadata for all tables in the database.
* Each array element is an instance of [[TableSchema]] or its child class.
*/
public function getTableSchemas($schema = '', $refresh = false)
{
return $this->getSchemaMetadata($schema, 'schema', $refresh);
}
/**
* Returns all schema names in the database, except system schemas.
* @param bool $refresh whether to fetch the latest available schema names. If this is false,
* schema names fetched previously (if available) will be returned.
* @return string[] all schema names in the database, except system schemas.
* @since 2.0.4
*/
public function getSchemaNames($refresh = false)
{
if ($this->_schemaNames === null || $refresh) {
$this->_schemaNames = $this->findSchemaNames();
}
return $this->_schemaNames;
}
/**
* Returns all table names in the database.
* @param string $schema the schema of the tables. Defaults to empty string, meaning the current or default schema name.
* If not empty, the returned table names will be prefixed with the schema name.
* @param bool $refresh whether to fetch the latest available table names. If this is false,
* table names fetched previously (if available) will be returned.
* @return string[] all table names in the database.
*/
public function getTableNames($schema = '', $refresh = false)
{
if (!isset($this->_tableNames[$schema]) || $refresh) {
$this->_tableNames[$schema] = $this->findTableNames($schema);
}
return $this->_tableNames[$schema];
}
/**
* @return QueryBuilder the query builder for this connection.
*/
public function getQueryBuilder()
{
if ($this->_builder === null) {
$this->_builder = $this->createQueryBuilder();
}
return $this->_builder;
}
/**
* Determines the PDO type for the given PHP data value.
* @param mixed $data the data whose PDO type is to be determined
* @return int the PDO type
* @see https://secure.php.net/manual/en/pdo.constants.php
*/
public function getPdoType($data)
{
static $typeMap = [
// php type => PDO type
'boolean' => \PDO::PARAM_BOOL,
'integer' => \PDO::PARAM_INT,
'string' => \PDO::PARAM_STR,
'resource' => \PDO::PARAM_LOB,
'NULL' => \PDO::PARAM_NULL,
];
$type = gettype($data);
return isset($typeMap[$type]) ? $typeMap[$type] : \PDO::PARAM_STR;
}
/**
* Refreshes the schema.
* This method cleans up all cached table schemas so that they can be re-created later
* to reflect the database schema change.
*/
public function refresh()
{
/* @var $cache CacheInterface */
$cache = is_string($this->db->schemaCache) ? Yii::$app->get($this->db->schemaCache, false) : $this->db->schemaCache;
if ($this->db->enableSchemaCache && $cache instanceof CacheInterface) {
TagDependency::invalidate($cache, $this->getCacheTag());
}
$this->_tableNames = [];
$this->_tableMetadata = [];
}
/**
* Refreshes the particular table schema.
* This method cleans up cached table schema so that it can be re-created later
* to reflect the database schema change.
* @param string $name table name.
* @since 2.0.6
*/
public function refreshTableSchema($name)
{
$rawName = $this->getRawTableName($name);
unset($this->_tableMetadata[$rawName]);
$this->_tableNames = [];
/* @var $cache CacheInterface */
$cache = is_string($this->db->schemaCache) ? Yii::$app->get($this->db->schemaCache, false) : $this->db->schemaCache;
if ($this->db->enableSchemaCache && $cache instanceof CacheInterface) {
$cache->delete($this->getCacheKey($rawName));
}
}
/**
* Creates a query builder for the database.
* This method may be overridden by child classes to create a DBMS-specific query builder.
* @return QueryBuilder query builder instance
*/
public function createQueryBuilder()
{
return new QueryBuilder($this->db);
}
/**
* Create a column schema builder instance giving the type and value precision.
*
* This method may be overridden by child classes to create a DBMS-specific column schema builder.
*
* @param string $type type of the column. See [[ColumnSchemaBuilder::$type]].
* @param int|string|array $length length or precision of the column. See [[ColumnSchemaBuilder::$length]].
* @return ColumnSchemaBuilder column schema builder instance
* @since 2.0.6
*/
public function createColumnSchemaBuilder($type, $length = null)
{
return new ColumnSchemaBuilder($type, $length);
}
/**
* Returns all unique indexes for the given table.
*
* Each array element is of the following structure:
*
* ```php
* [
* 'IndexName1' => ['col1' [, ...]],
* 'IndexName2' => ['col2' [, ...]],
* ]
* ```
*
* This method should be overridden by child classes in order to support this feature
* because the default implementation simply throws an exception
* @param TableSchema $table the table metadata
* @return array all unique indexes for the given table.
* @throws NotSupportedException if this method is called
*/
public function findUniqueIndexes($table)
{
throw new NotSupportedException(get_class($this) . ' does not support getting unique indexes information.');
}
/**
* Returns the ID of the last inserted row or sequence value.
* @param string $sequenceName name of the sequence object (required by some DBMS)
* @return string the row ID of the last row inserted, or the last value retrieved from the sequence object
* @throws InvalidCallException if the DB connection is not active
* @see https://secure.php.net/manual/en/function.PDO-lastInsertId.php
*/
public function getLastInsertID($sequenceName = '')
{
if ($this->db->isActive) {
return $this->db->pdo->lastInsertId($sequenceName === '' ? null : $this->quoteTableName($sequenceName));
}
throw new InvalidCallException('DB Connection is not active.');
}
/**
* @return bool whether this DBMS supports [savepoint](http://en.wikipedia.org/wiki/Savepoint).
*/
public function supportsSavepoint()
{
return $this->db->enableSavepoint;
}
/**
* Creates a new savepoint.
* @param string $name the savepoint name
*/
public function createSavepoint($name)
{
$this->db->createCommand("SAVEPOINT $name")->execute();
}
/**
* Releases an existing savepoint.
* @param string $name the savepoint name
*/
public function releaseSavepoint($name)
{
$this->db->createCommand("RELEASE SAVEPOINT $name")->execute();
}
/**
* Rolls back to a previously created savepoint.
* @param string $name the savepoint name
*/
public function rollBackSavepoint($name)
{
$this->db->createCommand("ROLLBACK TO SAVEPOINT $name")->execute();
}
/**
* Sets the isolation level of the current transaction.
* @param string $level The transaction isolation level to use for this transaction.
* This can be one of [[Transaction::READ_UNCOMMITTED]], [[Transaction::READ_COMMITTED]], [[Transaction::REPEATABLE_READ]]
* and [[Transaction::SERIALIZABLE]] but also a string containing DBMS specific syntax to be used
* after `SET TRANSACTION ISOLATION LEVEL`.
* @see http://en.wikipedia.org/wiki/Isolation_%28database_systems%29#Isolation_levels
*/
public function setTransactionIsolationLevel($level)
{
$this->db->createCommand("SET TRANSACTION ISOLATION LEVEL $level")->execute();
}
/**
* Executes the INSERT command, returning primary key values.
* @param string $table the table that new rows will be inserted into.
* @param array $columns the column data (name => value) to be inserted into the table.
* @return array|false primary key values or false if the command fails
* @since 2.0.4
*/
public function insert($table, $columns)
{
$command = $this->db->createCommand()->insert($table, $columns);
if (!$command->execute()) {
return false;
}
$tableSchema = $this->getTableSchema($table);
$result = [];
foreach ($tableSchema->primaryKey as $name) {
if ($tableSchema->columns[$name]->autoIncrement) {
$result[$name] = $this->getLastInsertID($tableSchema->sequenceName);
break;
}
$result[$name] = isset($columns[$name]) ? $columns[$name] : $tableSchema->columns[$name]->defaultValue;
}
return $result;
}
/**
* Quotes a string value for use in a query.
* Note that if the parameter is not a string, it will be returned without change.
* @param string $str string to be quoted
* @return string the properly quoted string
* @see https://secure.php.net/manual/en/function.PDO-quote.php
*/
public function quoteValue($str)
{
if (!is_string($str)) {
return $str;
}
if (($value = $this->db->getSlavePdo()->quote($str)) !== false) {
return $value;
}
// the driver doesn't support quote (e.g. oci)
return "'" . addcslashes(str_replace("'", "''", $str), "\000\n\r\\\032") . "'";
}
/**
* Quotes a table name for use in a query.
* If the table name contains schema prefix, the prefix will also be properly quoted.
* If the table name is already quoted or contains '(' or '{{',
* then this method will do nothing.
* @param string $name table name
* @return string the properly quoted table name
* @see quoteSimpleTableName()
*/
public function quoteTableName($name)
{
if (strpos($name, '(') !== false || strpos($name, '{{') !== false) {
return $name;
}
if (strpos($name, '.') === false) {
return $this->quoteSimpleTableName($name);
}
$parts = explode('.', $name);
foreach ($parts as $i => $part) {
$parts[$i] = $this->quoteSimpleTableName($part);
}
return implode('.', $parts);
}
/**
* Quotes a column name for use in a query.
* If the column name contains prefix, the prefix will also be properly quoted.
* If the column name is already quoted or contains '(', '[[' or '{{',
* then this method will do nothing.
* @param string $name column name
* @return string the properly quoted column name
* @see quoteSimpleColumnName()
*/
public function quoteColumnName($name)
{
if (strpos($name, '(') !== false || strpos($name, '[[') !== false) {
return $name;
}
if (($pos = strrpos($name, '.')) !== false) {
$prefix = $this->quoteTableName(substr($name, 0, $pos)) . '.';
$name = substr($name, $pos + 1);
} else {
$prefix = '';
}
if (strpos($name, '{{') !== false) {
return $name;
}
return $prefix . $this->quoteSimpleColumnName($name);
}
/**
* Quotes a simple table name for use in a query.
* A simple table name should contain the table name only without any schema prefix.
* If the table name is already quoted, this method will do nothing.
* @param string $name table name
* @return string the properly quoted table name
*/
public function quoteSimpleTableName($name)
{
if (is_string($this->tableQuoteCharacter)) {
$startingCharacter = $endingCharacter = $this->tableQuoteCharacter;
} else {
list($startingCharacter, $endingCharacter) = $this->tableQuoteCharacter;
}
return strpos($name, $startingCharacter) !== false ? $name : $startingCharacter . $name . $endingCharacter;
}
/**
* Quotes a simple column name for use in a query.
* A simple column name should contain the column name only without any prefix.
* If the column name is already quoted or is the asterisk character '*', this method will do nothing.
* @param string $name column name
* @return string the properly quoted column name
*/
public function quoteSimpleColumnName($name)
{
if (is_string($this->tableQuoteCharacter)) {
$startingCharacter = $endingCharacter = $this->columnQuoteCharacter;
} else {
list($startingCharacter, $endingCharacter) = $this->columnQuoteCharacter;
}
return $name === '*' || strpos($name, $startingCharacter) !== false ? $name : $startingCharacter . $name . $endingCharacter;
}
/**
* Unquotes a simple table name.
* A simple table name should contain the table name only without any schema prefix.
* If the table name is not quoted, this method will do nothing.
* @param string $name table name.
* @return string unquoted table name.
* @since 2.0.14
*/
public function unquoteSimpleTableName($name)
{
if (is_string($this->tableQuoteCharacter)) {
$startingCharacter = $this->tableQuoteCharacter;
} else {
$startingCharacter = $this->tableQuoteCharacter[0];
}
return strpos($name, $startingCharacter) === false ? $name : substr($name, 1, -1);
}
/**
* Unquotes a simple column name.
* A simple column name should contain the column name only without any prefix.
* If the column name is not quoted or is the asterisk character '*', this method will do nothing.
* @param string $name column name.
* @return string unquoted column name.
* @since 2.0.14
*/
public function unquoteSimpleColumnName($name)
{
if (is_string($this->columnQuoteCharacter)) {
$startingCharacter = $this->columnQuoteCharacter;
} else {
$startingCharacter = $this->columnQuoteCharacter[0];
}
return strpos($name, $startingCharacter) === false ? $name : substr($name, 1, -1);
}
/**
* Returns the actual name of a given table name.
* This method will strip off curly brackets from the given table name
* and replace the percentage character '%' with [[Connection::tablePrefix]].
* @param string $name the table name to be converted
* @return string the real name of the given table name
*/
public function getRawTableName($name)
{
if (strpos($name, '{{') !== false) {
$name = preg_replace('/\\{\\{(.*?)\\}\\}/', '\1', $name);
return str_replace('%', $this->db->tablePrefix, $name);
}
return $name;
}
/**
* Extracts the PHP type from abstract DB type.
* @param ColumnSchema $column the column schema information
* @return string PHP type name
*/
protected function getColumnPhpType($column)
{
static $typeMap = [
// abstract type => php type
self::TYPE_TINYINT => 'integer',
self::TYPE_SMALLINT => 'integer',
self::TYPE_INTEGER => 'integer',
self::TYPE_BIGINT => 'integer',
self::TYPE_BOOLEAN => 'boolean',
self::TYPE_FLOAT => 'double',
self::TYPE_DOUBLE => 'double',
self::TYPE_BINARY => 'resource',
self::TYPE_JSON => 'array',
];
if (isset($typeMap[$column->type])) {
if ($column->type === 'bigint') {
return PHP_INT_SIZE === 8 && !$column->unsigned ? 'integer' : 'string';
} elseif ($column->type === 'integer') {
return PHP_INT_SIZE === 4 && $column->unsigned ? 'string' : 'integer';
}
return $typeMap[$column->type];
}
return 'string';
}
/**
* Converts a DB exception to a more concrete one if possible.
*
* @param \Exception $e
* @param string $rawSql SQL that produced exception
* @return Exception
*/
public function convertException(\Exception $e, $rawSql)
{
if ($e instanceof Exception) {
return $e;
}
$exceptionClass = '\yii\db\Exception';
foreach ($this->exceptionMap as $error => $class) {
if (strpos($e->getMessage(), $error) !== false) {
$exceptionClass = $class;
}
}
$message = $e->getMessage() . "\nThe SQL being executed was: $rawSql";
$errorInfo = $e instanceof \PDOException ? $e->errorInfo : null;
return new $exceptionClass($message, $errorInfo, (int) $e->getCode(), $e);
}
/**
* Returns a value indicating whether a SQL statement is for read purpose.
* @param string $sql the SQL statement
* @return bool whether a SQL statement is for read purpose.
*/
public function isReadQuery($sql)
{
$pattern = '/^\s*(SELECT|SHOW|DESCRIBE)\b/i';
return preg_match($pattern, $sql) > 0;
}
/**
* Returns a server version as a string comparable by [[\version_compare()]].
* @return string server version as a string.
* @since 2.0.14
*/
public function getServerVersion()
{
if ($this->_serverVersion === null) {
$this->_serverVersion = $this->db->getSlavePdo()->getAttribute(\PDO::ATTR_SERVER_VERSION);
}
return $this->_serverVersion;
}
/**
* Returns the cache key for the specified table name.
* @param string $name the table name.
* @return mixed the cache key.
*/
protected function getCacheKey($name)
{
return [
__CLASS__,
$this->db->dsn,
$this->db->username,
$this->getRawTableName($name),
];
}
/**
* Returns the cache tag name.
* This allows [[refresh()]] to invalidate all cached table schemas.
* @return string the cache tag name
*/
protected function getCacheTag()
{
return md5(serialize([
__CLASS__,
$this->db->dsn,
$this->db->username,
]));
}
/**
* Returns the metadata of the given type for the given table.
* If there's no metadata in the cache, this method will call
* a `'loadTable' . ucfirst($type)` named method with the table name to obtain the metadata.
* @param string $name table name. The table name may contain schema name if any. Do not quote the table name.
* @param string $type metadata type.
* @param bool $refresh whether to reload the table metadata even if it is found in the cache.
* @return mixed metadata.
* @since 2.0.13
*/
protected function getTableMetadata($name, $type, $refresh)
{
$cache = null;
if ($this->db->enableSchemaCache && !in_array($name, $this->db->schemaCacheExclude, true)) {
$schemaCache = is_string($this->db->schemaCache) ? Yii::$app->get($this->db->schemaCache, false) : $this->db->schemaCache;
if ($schemaCache instanceof CacheInterface) {
$cache = $schemaCache;
}
}
$rawName = $this->getRawTableName($name);
if (!isset($this->_tableMetadata[$rawName])) {
$this->loadTableMetadataFromCache($cache, $rawName);
}
if ($refresh || !array_key_exists($type, $this->_tableMetadata[$rawName])) {
$this->_tableMetadata[$rawName][$type] = $this->{'loadTable' . ucfirst($type)}($rawName);
$this->saveTableMetadataToCache($cache, $rawName);
}
return $this->_tableMetadata[$rawName][$type];
}
/**
* Returns the metadata of the given type for all tables in the given schema.
* This method will call a `'getTable' . ucfirst($type)` named method with the table name
* and the refresh flag to obtain the metadata.
* @param string $schema the schema of the metadata. Defaults to empty string, meaning the current or default schema name.
* @param string $type metadata type.
* @param bool $refresh whether to fetch the latest available table metadata. If this is `false`,
* cached data may be returned if available.
* @return array array of metadata.
* @since 2.0.13
*/
protected function getSchemaMetadata($schema, $type, $refresh)
{
$metadata = [];
$methodName = 'getTable' . ucfirst($type);
foreach ($this->getTableNames($schema, $refresh) as $name) {
if ($schema !== '') {
$name = $schema . '.' . $name;
}
$tableMetadata = $this->$methodName($name, $refresh);
if ($tableMetadata !== null) {
$metadata[] = $tableMetadata;
}
}
return $metadata;
}
/**
* Sets the metadata of the given type for the given table.
* @param string $name table name.
* @param string $type metadata type.
* @param mixed $data metadata.
* @since 2.0.13
*/
protected function setTableMetadata($name, $type, $data)
{
$this->_tableMetadata[$this->getRawTableName($name)][$type] = $data;
}
/**
* Changes row's array key case to lower if PDO's one is set to uppercase.
* @param array $row row's array or an array of row's arrays.
* @param bool $multiple whether multiple rows or a single row passed.
* @return array normalized row or rows.
* @since 2.0.13
*/
protected function normalizePdoRowKeyCase(array $row, $multiple)
{
if ($this->db->getSlavePdo()->getAttribute(\PDO::ATTR_CASE) !== \PDO::CASE_UPPER) {
return $row;
}
if ($multiple) {
return array_map(function (array $row) {
return array_change_key_case($row, CASE_LOWER);
}, $row);
}
return array_change_key_case($row, CASE_LOWER);
}
/**
* Tries to load and populate table metadata from cache.
* @param Cache|null $cache
* @param string $name
*/
private function loadTableMetadataFromCache($cache, $name)
{
if ($cache === null) {
$this->_tableMetadata[$name] = [];
return;
}
$metadata = $cache->get($this->getCacheKey($name));
if (!is_array($metadata) || !isset($metadata['cacheVersion']) || $metadata['cacheVersion'] !== static::SCHEMA_CACHE_VERSION) {
$this->_tableMetadata[$name] = [];
return;
}
unset($metadata['cacheVersion']);
$this->_tableMetadata[$name] = $metadata;
}
/**
* Saves table metadata to cache.
* @param Cache|null $cache
* @param string $name
*/
private function saveTableMetadataToCache($cache, $name)
{
if ($cache === null) {
return;
}
$metadata = $this->_tableMetadata[$name];
$metadata['cacheVersion'] = static::SCHEMA_CACHE_VERSION;
$cache->set(
$this->getCacheKey($name),
$metadata,
$this->db->schemaCacheDuration,
new TagDependency(['tags' => $this->getCacheTag()])
);
}
}
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