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Commit 78623f3e by Qiang Xue
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Finished all cache components.

parent 23be1a7c
Showing with 198 additions and 228 deletions
framework/caching/DbCache.php
......@@ -16,16 +16,28 @@ use yii\db\dao\Query;
/**
* DbCache implements a cache application component by storing cached data in a database.
*
* DbCache stores cache data in a DB table named {@link cacheTableName}.
* If the table does not exist, it will be automatically created.
* By setting {@link autoCreateCacheTable} to false, you can also manually create the DB table.
* DbCache stores cache data in a DB table whose name is specified via [[cacheTableName]].
* For MySQL database, the table should be created beforehand as follows :
*
* DbCache relies on {@link http://www.php.net/manual/en/ref.pdo.php PDO} to access database.
* By default, it will use a SQLite3 database under the application runtime directory.
* You can also specify {@link connectionID} so that it makes use of
* a DB application component to access database.
* ~~~
* CREATE TABLE tbl_cache (
* id char(128) NOT NULL,
* expire int(11) DEFAULT NULL,
* data LONGBLOB,
* PRIMARY KEY (id),
* KEY expire (expire)
* );
* ~~~
*
* See {@link CCache} manual for common cache operations that are supported by DbCache.
* You should replace `LONGBLOB` as follows if you are using a different DBMS:
*
* - PostgreSQL: `BYTEA`
* - SQLite, SQL server, Oracle: `BLOB`
*
* DbCache connects to the database via the DB connection specified in [[connectionID]]
* which must refer to a valid DB application component.
*
* Please refer to [[Cache]] for common cache operations that are supported by DbCache.
*
* @property Connection $dbConnection The DB connection instance.
*
......@@ -35,30 +47,16 @@ use yii\db\dao\Query;
class DbCache extends Cache
{
/**
* @var string the ID of the {@link Connection} application component. If not set,
* a SQLite3 database will be automatically created and used. The SQLite database file
* is <code>protected/runtime/cache-YiiVersion.db</code>.
* @var string the ID of the [[Connection|DB connection]] application component.
* Defaults to 'db'.
*/
public $connectionID;
public $connectionID = 'db';
/**
* @var string name of the DB table to store cache content. Defaults to 'YiiCache'.
* Note, if {@link autoCreateCacheTable} is false and you want to create the DB table
* manually by yourself, you need to make sure the DB table is of the following structure:
* <pre>
* (id CHAR(128) PRIMARY KEY, expire INTEGER, value BLOB)
* </pre>
* Note, some DBMS might not support BLOB type. In this case, replace 'BLOB' with a suitable
* binary data type (e.g. LONGBLOB in MySQL, BYTEA in PostgreSQL.)
* @see autoCreateCacheTable
* @var string name of the DB table to store cache content. Defaults to 'tbl_cache'.
* The table must be created before using this cache component.
*/
public $cacheTableName = 'tbl_cache';
/**
* @var boolean whether the cache DB table should be created automatically if it does not exist. Defaults to true.
* If you already have the table created, it is recommended you set this property to be false to improve performance.
* @see cacheTableName
*/
public $autoCreateCacheTable = true;
/**
* @var integer the probability (parts per million) that garbage collection (GC) should be performed
* when storing a piece of data in the cache. Defaults to 100, meaning 0.01% chance.
* This number should be between 0 and 1000000. A value 0 meaning no GC will be performed at all.
......@@ -70,57 +68,6 @@ class DbCache extends Cache
private $_db;
/**
* Initializes this application component.
*
* This method is required by the {@link IApplicationComponent} interface.
* It ensures the existence of the cache DB table.
* It also removes expired data items from the cache.
*/
public function init()
{
parent::init();
$db = $this->getDbConnection();
$db->setActive(true);
if ($this->autoCreateCacheTable) {
$sql = "DELETE FROM {$this->cacheTableName} WHERE expire>0 AND expire<" . time();
try {
$db->createCommand($sql)->execute();
} catch (Exception $e) {
$this->createCacheTable($db, $this->cacheTableName);
}
}
}
/**
* Creates the cache DB table.
* @param Connection $db the database connection
* @param string $tableName the name of the table to be created
*/
protected function createCacheTable($db, $tableName)
{
$driver = $db->getDriverName();
if ($driver === 'mysql') {
$blob = 'LONGBLOB';
} else {
if ($driver === 'pgsql') {
$blob = 'BYTEA';
} else {
$blob = 'BLOB';
}
}
$sql = <<<EOD
CREATE TABLE $tableName
(
id CHAR(128) PRIMARY KEY,
expire INTEGER,
value $blob
)
EOD;
$db->createCommand($sql)->execute();
}
/**
* Returns the DB connection instance used for caching purpose.
* @return Connection the DB connection instance
* @throws Exception if [[connectionID]] does not point to a valid application component.
......@@ -128,7 +75,8 @@ EOD;
public function getDbConnection()
{
if ($this->_db === null) {
if ($this->connectionID !== null && ($db = \Yii::$application->getComponent($this->connectionID)) instanceof Connection) {
$db = \Yii::$application->getComponent($this->connectionID);
if ($db instanceof Connection) {
$this->_db = $db;
} else {
throw new Exception("DbCache.connectionID must refer to the ID of a DB connection application component.");
......@@ -155,10 +103,9 @@ EOD;
protected function getValue($key)
{
$query = new Query;
$query->select(array('value'))
$query->select(array('data'))
->from($this->cacheTableName)
->where(array('id' => $key))
->andWhere('expire = 0 OR expire > ' . time());
->where('id = :id AND (expire = 0 OR expire > :time)', array(':id' => $key, ':time' => time()));
$db = $this->getDbConnection();
if ($db->queryCachingDuration >= 0) {
$duration = $db->queryCachingDuration;
......@@ -181,19 +128,20 @@ EOD;
if (empty($keys)) {
return array();
}
$ids = implode("','", $keys);
$time = time();
$sql = "SELECT id, value FROM {$this->cacheTableName} WHERE id IN ('$ids') AND (expire=0 OR expire>$time)";
$query = new Query;
$query->select(array('id', 'data'))
->from($this->cacheTableName)
->where(array('id' => $keys))
->andWhere("expire = 0 OR expire > " . time() . ")");
$db = $this->getDbConnection();
if ($db->queryCachingDuration > 0) {
if ($db->queryCachingDuration >= 0) {
$duration = $db->queryCachingDuration;
$db->queryCachingDuration = 0;
$rows = $db->createCommand($sql)->queryAll();
$db->queryCachingDuration = -1;
$rows = $query->createCommand($db)->queryAll();
$db->queryCachingDuration = $duration;
} else {
$rows = $db->createCommand($sql)->queryAll();
$rows = $query->createCommand($db)->queryAll();
}
$results = array();
......@@ -201,7 +149,7 @@ EOD;
$results[$key] = false;
}
foreach ($rows as $row) {
$results[$row['id']] = $row['value'];
$results[$row['id']] = $row['data'];
}
return $results;
}
......@@ -217,9 +165,21 @@ EOD;
*/
protected function setValue($key, $value, $expire)
{
$this->deleteValue($key);
return $this->addValue($key, $value, $expire);
}
$query = new Query;
$command = $query->update($this->cacheTableName, array(
'expire' => $expire > 0 ? $expire + time() : 0,
'data' => array($value, \PDO::PARAM_LOB),
), array(
'id' => $key,
))->createCommand($this->getDbConnection());
if ($command->execute()) {
$this->gc();
return true;
} else {
return $this->addValue($key, $value, $expire);
}
}
/**
* Stores a value identified by a key into cache if the cache does not contain this key.
......@@ -232,19 +192,21 @@ EOD;
*/
protected function addValue($key, $value, $expire)
{
if (mt_rand(0, 1000000) < $this->_gcProbability) {
$this->gc();
}
$this->gc();
if ($expire > 0) {
$expire += time();
} else {
$expire = 0;
}
$sql = "INSERT INTO {$this->cacheTableName} (id,expire,value) VALUES ('$key',$expire,:value)";
$query = new Query;
$command = $query->insert($this->cacheTableName, array(
'id' => $key,
'expire' => $expire,
'data' => array($value, \PDO::PARAM_LOB),
))->createCommand($this->getDbConnection());
try {
$command = $this->getDbConnection()->createCommand($sql);
$command->bindValue(':value', $value, PDO::PARAM_LOB);
$command->execute();
return true;
} catch (Exception $e) {
......@@ -260,28 +222,39 @@ EOD;
*/
protected function deleteValue($key)
{
$sql = "DELETE FROM {$this->cacheTableName} WHERE id='$key'";
$this->getDbConnection()->createCommand($sql)->execute();
$query = new Query;
$query->delete($this->cacheTableName, array('id' => $key))
->createCommand($this->getDbConnection())
->execute();
return true;
}
/**
* Removes the expired data values.
* @param boolean $force whether to enforce the garbage collection regardless of [[gcProbability]].
* Defaults to false, meaning the actual deletion happens with the probability as specified by [[gcProbability]].
*/
protected function gc()
public function gc($force = false)
{
$this->getDbConnection()->createCommand("DELETE FROM {$this->cacheTableName} WHERE expire>0 AND expire<" . time())->execute();
if ($force || mt_rand(0, 1000000) < $this->gcProbability) {
$query = new Query;
$query->delete($this->cacheTableName, 'expire > 0 AND expire < ' . time())
->createCommand($this->getDbConnection())
->execute();
}
}
/**
* Deletes all values from cache.
* This is the implementation of the method declared in the parent class.
* @return boolean whether the flush operation was successful.
* @since 1.1.5
*/
protected function flushValues()
{
$this->getDbConnection()->createCommand("DELETE FROM {$this->cacheTableName}")->execute();
$query = new Query;
$query->delete($this->cacheTableName)
->createCommand($this->getDbConnection())
->execute();
return true;
}
}
framework/caching/MemCache.php
......@@ -54,7 +54,7 @@ use yii\base\Exception;
* In the above, two memcache servers are used: server1 and server2. You can configure more properties of
* each server, such as `persistent`, `weight`, `timeout`. Please see [[MemCacheServer]] for available options.
*
* @property mixed $memCache The memcache instance (or memcached if [[useMemcached]] is true) used by this component.
* @property \Memcache|\Memcached $memCache The memcache instance (or memcached if [[useMemcached]] is true) used by this component.
* @property MemCacheServer[] $servers List of memcache server configurations.
*
* @author Qiang Xue <qiang.xue@gmail.com>
......
framework/db/dao/Command.php
......@@ -186,7 +186,9 @@ class Command extends \yii\base\Component
* Note that the SQL data type of each value is determined by its PHP type.
* @param array $values the values to be bound. This must be given in terms of an associative
* array with array keys being the parameter names, and array values the corresponding parameter values,
* e.g. `array(':name'=>'John', ':age'=>25)`.
* e.g. `array(':name'=>'John', ':age'=>25)`. By default, the PDO type of each value is determined
* by its PHP type. You may explicitly specify the PDO type by using an array: `array(value, type)`,
* e.g. `array(':name'=>'John', ':profile'=>array($profile, \PDO::PARAM_LOB))`.
* @return Command the current command being executed
*/
public function bindValues($values)
......@@ -194,7 +196,13 @@ class Command extends \yii\base\Component
if (!empty($values)) {
$this->prepare();
foreach ($values as $name => $value) {
$this->pdoStatement->bindValue($name, $value, $this->connection->getPdoType(gettype($value)));
if (is_array($value)) {
$type = $value[1];
$value = $value[0];
} else {
$type = $this->connection->getPdoType(gettype($value));
}
$this->pdoStatement->bindValue($name, $value, $type);
$this->_params[$name] = $value;
}
}
......
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