/
BaseSchema.php
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/
BaseSchema.php
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<?php
/**
* PHP Version 5.4
*
* CakePHP(tm) : Rapid Development Framework (http://cakephp.org)
* Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)
*
* Licensed under The MIT License
* For full copyright and license information, please see the LICENSE.txt
* Redistributions of files must retain the above copyright notice.
*
* @copyright Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)
* @link http://cakephp.org CakePHP(tm) Project
* @since CakePHP(tm) v 3.0.0
* @license MIT License (http://www.opensource.org/licenses/mit-license.php)
*/
namespace Cake\Database\Schema;
use Cake\Database\Driver;
use Cake\Database\Schema\Table;
/**
* Base class for schema implementations.
*
* This class contains methods that are common across
* the various SQL dialects.
*/
abstract class BaseSchema {
/**
* The driver instance being used.
*
* @var \Cake\Database\Driver
*/
protected $_driver;
/**
* Constructor
*
* @param \Cake\Database\Driver $driver The driver to use.
*/
public function __construct(Driver $driver) {
$this->_driver = $driver;
}
/**
* Generate an ON clause for a foreign key.
*
* @param string|null $on The on clause
* @return string
*/
protected function _foreignOnClause($on) {
if ($on === Table::ACTION_SET_NULL) {
return 'SET NULL';
}
if ($on === Table::ACTION_CASCADE) {
return 'CASCADE';
}
if ($on === Table::ACTION_RESTRICT) {
return 'RESTRICT';
}
if ($on === Table::ACTION_NO_ACTION) {
return 'NO ACTION';
}
}
/**
* Convert string on clauses to the abstract ones.
*
* @param string $clause
* @return string|null
*/
protected function _convertOnClause($clause) {
if ($clause === 'CASCADE' || $clause === 'RESTRICT') {
return strtolower($clause);
}
if ($clause === 'NO ACTION') {
return Table::ACTION_NO_ACTION;
}
return Table::ACTION_SET_NULL;
}
/**
* Generate the SQL to drop a table.
*
* @param \Cake\Database\Schema\Table $table Table instance
* @return array SQL statements to drop a table.
*/
public function dropTableSql(Table $table) {
$sql = sprintf(
'DROP TABLE %s',
$this->_driver->quoteIdentifier($table->name())
);
return [$sql];
}
/**
* Generate the SQL to list the tables.
*
* @param array $config The connection configuration to use for
* getting tables from.
* @return array An array of (sql, params) to execute.
*/
abstract public function listTablesSql($config);
/**
* Generate the SQL to describe a table.
*
* @param string $name The table name to get information on.
* @param array $config The connection configuration.
* @return array An array of (sql, params) to execute.
*/
abstract public function describeTableSql($name, $config);
/**
* Generate the SQL to describe the indexes in a table.
*
* @param string $table The table name to get information on.
* @param array $config The connection configuration.
* @return array An array of (sql, params) to execute.
*/
abstract public function describeIndexSql($table, $config);
/**
* Generate the SQL to describe the foreign keys in a table.
*
* @param string $table The table name to get information on.
* @param array $config The connection configuration.
* @return array An array of (sql, params) to execute.
*/
abstract public function describeForeignKeySql($table, $config);
/**
* Convert field description results into abstract schema fields.
*
* @param \Cake\Database\Schema\Table $table The table object to append fields to.
* @param array $row The row data from `describeTableSql`.
* @return void
*/
abstract public function convertFieldDescription(Table $table, $row);
/**
* Convert an index description results into abstract schema indexes or constraints.
*
* @param \Cake\Database\Schema\Table $table The table object to append
* an index or constraint to.
* @param array $row The row data from `describeIndexSql`.
* @return void
*/
abstract public function convertIndexDescription(Table $table, $row);
/**
* Convert a foreign key description into constraints on the Table object.
*
* @param \Cake\Database\Schema\Table $table The table object to append
* a constraint to.
* @param array $row The row data from `describeForeignKeySql`.
* @return void
*/
abstract public function convertForeignKeyDescription(Table $table, $row);
/**
* Generate the SQL to create a table.
*
* @param \Cake\Database\Schema\Table $table Table instance.
* @param array $columns The columns to go inside the table.
* @param array $constraints The constraints for the table.
* @param array $indexes The indexes for the table.
* @return array SQL statements to create a table.
*/
abstract public function createTableSql(Table $table, $columns, $constraints, $indexes);
/**
* Generate the SQL fragment for a single column in a table.
*
* @param \Cake\Database\Schema\Table $table The table instance the column is in.
* @param string $name The name of the column.
* @return string SQL fragment.
*/
abstract public function columnSql(Table $table, $name);
/**
* Generate the SQL fragments for defining table constraints.
*
* @param \Cake\Database\Schema\Table $table The table instance the column is in.
* @param string $name The name of the column.
* @return string SQL fragment.
*/
abstract public function constraintSql(Table $table, $name);
/**
* Generate the SQL fragment for a single index in a table.
*
* @param \Cake\Database\Schema\Table $table The table object the column is in.
* @param string $name The name of the column.
* @return string SQL fragment.
*/
abstract public function indexSql(Table $table, $name);
/**
* Generate the SQL to truncate a table.
*
* @param \Cake\Database\Schema\Table $table Table instance.
* @return array SQL statements to truncate a table.
*/
abstract public function truncateTableSql(Table $table);
}