/**
* Analyze the given query, producing a semantic representation of the most important elements
* as well as related schema information.
*
* @param \DataBundle\Connection $connection
* @param type $db
* @param type $query
* @return QueryAnalysis
*/
public function analyzeQuery(Connection $connection, $db, $query)
{
$driver = $this->drivers->getDriver($connection->getType());
$analysis = $driver->analyzeQuery($query);
$model = new QueryAnalysis();
$model->setValid($analysis->valid);
if (!$analysis->valid) {
return $model;
}
$selection = array();
if (isset($analysis->selection)) {
foreach ($analysis->selection as $select) {
$selection[] = new QuerySelection($select->column, $select->alias);
}
}
$model->setSelection($selection);
// Fetch the schemas
$froms = array();
if (isset($analysis->from)) {
foreach ($analysis->from as $source) {
$from = new QuerySource();
$from->setName($source->name);
$from->setColumns($this->schema->getTableSchema($connection, $db, $source->name));
$froms[] = $from;
}
}
$model->setFrom($froms);
return $model;
}
/**
* Establish a new database connection
*
* @param string $type
* @param string $hostname
* @param int $port
* @param string $username
* @param string $password
* @param string $key
*
* @return Connection
*/
public function establishConnection($type, $hostname, $port, $username, $password, &$key)
{
$key = NULL;
$connection = Connection::create($type, $hostname, $port, $username, $password, $key);
$driver = $this->drivers->getDriver($type);
// Test the connection
if (!$driver->testConnection($connection)) {
return null;
}
// Success, build and store the connection
$store = $this->getStore();
$store->add($connection);
// Lock (encrypt) the credentials and return the private key
$connection->lock();
return $connection;
}
/**
* Retrieve a set of Columns representing the schema of the given table.
*
* @param \DataBundle\Connection $connection
* @param string $db
* @param string $tableName
* @return Column[]
*/
public function getTableSchema(Connection $connection, $db, $tableName)
{
$driver = $this->drivers->getDriver($connection->getType());
$columns = array();
foreach ($driver->getSchema($connection, $db, $tableName) as $column) {
$columnModel = $this->modelForColumn($column);
$columns[] = $columnModel;
}
return $columns;
}
public function getSchema(Connection $connection, $db, $table)
{
if (isset($schemaCache["{$connection->getId()}:{$db}:{$table}"])) {
return $schemaCache["{$connection->getId()}:{$db}:{$table}"];
}
$rows = $this->rawQuery($connection, $db, 'SHOW FULL COLUMNS FROM ' . $this->quoteSchema($table));
$columns = array();
foreach ($rows as $row) {
$row = (array) $row;
$description = (object) array('name' => $row['Field'], 'type' => $row['Type'], 'nullable' => $row['Null'] == 'YES', 'default' => $row['Default'], 'encoding' => $row['Collation'], 'comment' => $row['Comment'], 'isPrimary' => $row['Key'] == 'PRI', 'isIndexed' => $row['Key'] ? true : false, 'auto' => strpos($row['Extra'], 'auto_increment'));
$columns[] = $description;
}
return $schemaCache["{$connection->getId()}:{$db}:{$table}"] = $columns;
}
