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<?php |
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/** |
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* Query |
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* |
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* SQL Query Builder / Database Abstraction Layer |
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* |
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* PHP version 5.4 |
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* |
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* @package Query |
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* @author Timothy J. Warren <[email protected]> |
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* @copyright 2012 - 2015 Timothy J. Warren |
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* @license http://www.opensource.org/licenses/mit-license.html MIT License |
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* @link https://git.timshomepage.net/aviat4ion/Query |
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*/ |
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// -------------------------------------------------------------------------- |
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namespace Query\Drivers; |
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// -------------------------------------------------------------------------- |
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/** |
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* Abstract class defining database / table creation methods |
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* |
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* @package Query |
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* @subpackage Drivers |
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* @method string quote_ident(string $sql) |
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* @method string quote_table(string $sql) |
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*/ |
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abstract class AbstractUtil { |
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/** |
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* Reference to the current connection object |
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* @var DriverInterface |
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*/ |
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private $conn; |
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/** |
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* Save a reference to the connection object for later use |
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* |
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* @param DriverInterface $conn |
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*/ |
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public function __construct(DriverInterface $conn) |
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{ |
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$this->conn = $conn; |
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} |
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// -------------------------------------------------------------------------- |
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/** |
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* Get the driver object for the current connection |
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* |
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* @return Driver_Interface |
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*/ |
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public function get_driver() |
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{ |
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return $this->conn; |
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} |
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// -------------------------------------------------------------------------- |
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/** |
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* Convenience public function to generate sql for creating a db table |
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* |
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* @param string $name |
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* @param array $fields |
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* @param array $constraints |
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* @param bool $if_not_exists |
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* @return string |
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*/ |
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public function create_table($name, $fields, array $constraints=[], $if_not_exists=TRUE) |
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{ |
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$exists_str = ($if_not_exists) ? ' IF NOT EXISTS ' : ' '; |
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// Reorganize into an array indexed with column information |
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// Eg $column_array[$colname] = array( |
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// 'type' => ..., |
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// 'constraint' => ..., |
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// 'index' => ..., |
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// ) |
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$column_array = \array_zipper([ |
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'type' => $fields, |
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'constraint' => $constraints |
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]); |
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// Join column definitions together |
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$columns = []; |
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foreach($column_array as $n => $props) |
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{ |
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$str = $this->get_driver()->quote_ident($n); |
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$str .= (isset($props['type'])) ? " {$props['type']}" : ""; |
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$str .= (isset($props['constraint'])) ? " {$props['constraint']}" : ""; |
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$columns[] = $str; |
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} |
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// Generate the sql for the creation of the table |
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$sql = 'CREATE TABLE'.$exists_str.$this->get_driver()->quote_table($name).' ('; |
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$sql .= implode(', ', $columns); |
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$sql .= ')'; |
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return $sql; |
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} |
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// -------------------------------------------------------------------------- |
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/** |
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* Drop the selected table |
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* |
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* @param string $name |
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* @return string |
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*/ |
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public function delete_table($name) |
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{ |
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return 'DROP TABLE IF EXISTS '.$this->get_driver()->quote_table($name); |
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} |
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// -------------------------------------------------------------------------- |
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// ! Abstract Methods |
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// -------------------------------------------------------------------------- |
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/** |
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* Return an SQL file with the database table structure |
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* |
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* @abstract |
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* @return string |
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*/ |
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abstract public function backup_structure(); |
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// -------------------------------------------------------------------------- |
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/** |
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* Return an SQL file with the database data as insert statements |
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* |
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* @abstract |
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* @return string |
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*/ |
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abstract public function backup_data(); |
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} |
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// End of abstract_util.php |
aviat4ion /
Query
