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<?php
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/**
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* @link http://www.yiiframework.com/
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* @copyright Copyright (c) 2008 Yii Software LLC
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* @license http://www.yiiframework.com/license/
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*/
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namespace yii\db;
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/**
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* Migration is the base class for representing a database migration.
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*
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* Migration is designed to be used together with the "yii migrate" command.
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*
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* Each child class of Migration represents an individual database migration which
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* is identified by the child class name.
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*
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* Within each migration, the [[up()]] method should be overwritten to contain the logic
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* for "upgrading" the database; while the [[down()]] method for the "downgrading"
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* logic. The "yii migrate" command manages all available migrations in an application.
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*
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* If the database supports transactions, you may also overwrite [[safeUp()]] and
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* [[safeDown()]] so that if anything wrong happens during the upgrading or downgrading,
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* the whole migration can be reverted in a whole.
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*
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* Migration provides a set of convenient methods for manipulating database data and schema.
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* For example, the [[insert()]] method can be used to easily insert a row of data into
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* a database table; the [[createTable()]] method can be used to create a database table.
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* Compared with the same methods in [[Command]], these methods will display extra
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* information showing the method parameters and execution time, which may be useful when
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* applying migrations.
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*
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* @author Qiang Xue <qiang.xue@gmail.com>
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* @since 2.0
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*/
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class Migration extends \yii\base\Component
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{
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/**
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* @var Connection the database connection that this migration should work with.
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* If not set, it will be initialized as the 'db' application component.
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*/
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public $db;
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/**
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* Initializes the migration.
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* This method will set [[db]] to be the 'db' application component, if it is null.
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*/
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public function init()
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{
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parent::init();
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if ($this->db === null) {
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$this->db = \Yii::$app->getComponent('db');
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}
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}
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/**
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* This method contains the logic to be executed when applying this migration.
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* Child classes may overwrite this method to provide actual migration logic.
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* @return boolean return a false value to indicate the migration fails
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* and should not proceed further. All other return values mean the migration succeeds.
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*/
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public function up()
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{
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$transaction = $this->db->beginTransaction();
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try {
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if ($this->safeUp() === false) {
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$transaction->rollback();
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return false;
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}
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$transaction->commit();
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} catch (\Exception $e) {
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echo "Exception: " . $e->getMessage() . ' (' . $e->getFile() . ':' . $e->getLine() . ")\n";
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echo $e->getTraceAsString() . "\n";
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$transaction->rollback();
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return false;
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}
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return null;
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}
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/**
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* This method contains the logic to be executed when removing this migration.
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* The default implementation throws an exception indicating the migration cannot be removed.
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* Child classes may override this method if the corresponding migrations can be removed.
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* @return boolean return a false value to indicate the migration fails
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* and should not proceed further. All other return values mean the migration succeeds.
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*/
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public function down()
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{
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$transaction = $this->db->beginTransaction();
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try {
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if ($this->safeDown() === false) {
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$transaction->rollback();
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return false;
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}
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$transaction->commit();
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} catch (\Exception $e) {
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echo "Exception: " . $e->getMessage() . ' (' . $e->getFile() . ':' . $e->getLine() . ")\n";
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echo $e->getTraceAsString() . "\n";
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$transaction->rollback();
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return false;
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}
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return null;
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}
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/**
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* This method contains the logic to be executed when applying this migration.
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* This method differs from [[up()]] in that the DB logic implemented here will
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* be enclosed within a DB transaction.
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* Child classes may implement this method instead of [[up()]] if the DB logic
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* needs to be within a transaction.
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* @return boolean return a false value to indicate the migration fails
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* and should not proceed further. All other return values mean the migration succeeds.
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*/
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public function safeUp()
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{
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}
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/**
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* This method contains the logic to be executed when removing this migration.
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* This method differs from [[down()]] in that the DB logic implemented here will
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* be enclosed within a DB transaction.
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* Child classes may implement this method instead of [[up()]] if the DB logic
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* needs to be within a transaction.
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* @return boolean return a false value to indicate the migration fails
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* and should not proceed further. All other return values mean the migration succeeds.
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*/
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public function safeDown()
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{
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}
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/**
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* Executes a SQL statement.
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* This method executes the specified SQL statement using [[db]].
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* @param string $sql the SQL statement to be executed
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* @param array $params input parameters (name => value) for the SQL execution.
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* See [[Command::execute()]] for more details.
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*/
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public function execute($sql, $params = array())
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{
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echo " > execute SQL: $sql ...";
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$time = microtime(true);
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$this->db->createCommand($sql)->execute($params);
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echo " done (time: " . sprintf('%.3f', microtime(true) - $time) . "s)\n";
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}
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/**
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* Creates and executes an INSERT SQL statement.
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* The method will properly escape the column names, and bind the values to be inserted.
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* @param string $table the table that new rows will be inserted into.
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* @param array $columns the column data (name => value) to be inserted into the table.
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*/
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public function insert($table, $columns)
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{
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echo " > insert into $table ...";
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$time = microtime(true);
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$this->db->createCommand()->insert($table, $columns)->execute();
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echo " done (time: " . sprintf('%.3f', microtime(true) - $time) . "s)\n";
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}
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/**
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* Creates and executes an UPDATE SQL statement.
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* The method will properly escape the column names and bind the values to be updated.
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* @param string $table the table to be updated.
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* @param array $columns the column data (name => value) to be updated.
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* @param mixed $condition the conditions that will be put in the WHERE part. Please
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* refer to [[Query::where()]] on how to specify conditions.
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* @param array $params the parameters to be bound to the query.
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*/
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public function update($table, $columns, $condition = '', $params = array())
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{
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echo " > update $table ...";
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$time = microtime(true);
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$this->db->createCommand()->update($table, $columns, $condition, $params)->execute();
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echo " done (time: " . sprintf('%.3f', microtime(true) - $time) . "s)\n";
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}
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/**
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* Creates and executes a DELETE SQL statement.
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* @param string $table the table where the data will be deleted from.
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* @param mixed $condition the conditions that will be put in the WHERE part. Please
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* refer to [[Query::where()]] on how to specify conditions.
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* @param array $params the parameters to be bound to the query.
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*/
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public function delete($table, $condition = '', $params = array())
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{
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echo " > delete from $table ...";
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$time = microtime(true);
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$this->db->createCommand()->delete($table, $condition, $params)->execute();
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echo " done (time: " . sprintf('%.3f', microtime(true) - $time) . "s)\n";
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}
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/**
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* Builds and executes a SQL statement for creating a new DB table.
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*
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* The columns in the new table should be specified as name-definition pairs (e.g. 'name' => 'string'),
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* where name stands for a column name which will be properly quoted by the method, and definition
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* stands for the column type which can contain an abstract DB type.
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*
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* The [[QueryBuilder::getColumnType()]] method will be invoked to convert any abstract type into a physical one.
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*
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* If a column is specified with definition only (e.g. 'PRIMARY KEY (name, type)'), it will be directly
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* put into the generated SQL.
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*
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* @param string $table the name of the table to be created. The name will be properly quoted by the method.
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* @param array $columns the columns (name => definition) in the new table.
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* @param string $options additional SQL fragment that will be appended to the generated SQL.
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*/
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public function createTable($table, $columns, $options = null)
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{
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echo " > create table $table ...";
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$time = microtime(true);
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$this->db->createCommand()->createTable($table, $columns, $options)->execute();
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echo " done (time: " . sprintf('%.3f', microtime(true) - $time) . "s)\n";
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}
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/**
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* Builds and executes a SQL statement for renaming a DB table.
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* @param string $table the table to be renamed. The name will be properly quoted by the method.
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* @param string $newName the new table name. The name will be properly quoted by the method.
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*/
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public function renameTable($table, $newName)
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{
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echo " > rename table $table to $newName ...";
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$time = microtime(true);
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$this->db->createCommand()->renameTable($table, $newName)->execute();
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echo " done (time: " . sprintf('%.3f', microtime(true) - $time) . "s)\n";
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}
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/**
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* Builds and executes a SQL statement for dropping a DB table.
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* @param string $table the table to be dropped. The name will be properly quoted by the method.
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*/
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public function dropTable($table)
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{
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echo " > drop table $table ...";
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$time = microtime(true);
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$this->db->createCommand()->dropTable($table)->execute();
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echo " done (time: " . sprintf('%.3f', microtime(true) - $time) . "s)\n";
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}
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/**
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* Builds and executes a SQL statement for truncating a DB table.
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* @param string $table the table to be truncated. The name will be properly quoted by the method.
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*/
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public function truncateTable($table)
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{
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echo " > truncate table $table ...";
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$time = microtime(true);
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$this->db->createCommand()->truncateTable($table)->execute();
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echo " done (time: " . sprintf('%.3f', microtime(true) - $time) . "s)\n";
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}
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/**
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* Builds and executes a SQL statement for adding a new DB column.
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* @param string $table the table that the new column will be added to. The table name will be properly quoted by the method.
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* @param string $column the name of the new column. The name will be properly quoted by the method.
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* @param string $type the column type. The [[QueryBuilder::getColumnType()]] method will be invoked to convert abstract column type (if any)
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* into the physical one. Anything that is not recognized as abstract type will be kept in the generated SQL.
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* For example, 'string' will be turned into 'varchar(255)', while 'string not null' will become 'varchar(255) not null'.
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*/
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public function addColumn($table, $column, $type)
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{
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echo " > add column $column $type to table $table ...";
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$time = microtime(true);
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$this->db->createCommand()->addColumn($table, $column, $type)->execute();
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echo " done (time: " . sprintf('%.3f', microtime(true) - $time) . "s)\n";
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}
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/**
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* Builds and executes a SQL statement for dropping a DB column.
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* @param string $table the table whose column is to be dropped. The name will be properly quoted by the method.
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* @param string $column the name of the column to be dropped. The name will be properly quoted by the method.
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*/
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public function dropColumn($table, $column)
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{
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echo " > drop column $column from table $table ...";
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$time = microtime(true);
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$this->db->createCommand()->dropColumn($table, $column)->execute();
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echo " done (time: " . sprintf('%.3f', microtime(true) - $time) . "s)\n";
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}
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/**
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* Builds and executes a SQL statement for renaming a column.
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* @param string $table the table whose column is to be renamed. The name will be properly quoted by the method.
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* @param string $name the old name of the column. The name will be properly quoted by the method.
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* @param string $newName the new name of the column. The name will be properly quoted by the method.
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*/
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public function renameColumn($table, $name, $newName)
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{
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echo " > rename column $name in table $table to $newName ...";
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$time = microtime(true);
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$this->db->createCommand()->renameColumn($table, $name, $newName)->execute();
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echo " done (time: " . sprintf('%.3f', microtime(true) - $time) . "s)\n";
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}
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/**
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* Builds and executes a SQL statement for changing the definition of a column.
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* @param string $table the table whose column is to be changed. The table name will be properly quoted by the method.
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* @param string $column the name of the column to be changed. The name will be properly quoted by the method.
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* @param string $type the new column type. The {@link getColumnType} method will be invoked to convert abstract column type (if any)
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* into the physical one. Anything that is not recognized as abstract type will be kept in the generated SQL.
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* For example, 'string' will be turned into 'varchar(255)', while 'string not null' will become 'varchar(255) not null'.
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*/
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public function alterColumn($table, $column, $type)
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{
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echo " > alter column $column in table $table to $type ...";
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$time = microtime(true);
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$this->db->createCommand()->alterColumn($table, $column, $type)->execute();
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echo " done (time: " . sprintf('%.3f', microtime(true) - $time) . "s)\n";
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}
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/**
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* Builds and executes a SQL statement for creating a primary key.
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* The method will properly quote the table and column names.
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* @param string $name the name of the primary key constraint.
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* @param string $table the table that the primary key constraint will be added to.
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* @param string|array $columns comma separated string or array of columns that the primary key will consist of.
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*/
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public function addPrimaryKey($name, $table, $columns)
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{
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echo " > add primary key $name on $table (".is_array($columns) ? implode(',',$columns) : $columns.") ...";
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$time = microtime(true);
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$this->db->createCommand()->addPrimaryKey($name, $table, $columns)->execute();
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echo " done (time: " . sprintf('%.3f', microtime(true) - $time) . "s)\n";
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}
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/**
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* Builds and executes a SQL statement for dropping a primary key.
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* @param string $name the name of the primary key constraint to be removed.
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* @param string $table the table that the primary key constraint will be removed from.
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* @return Command the command object itself
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*/
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public function dropPrimaryKey($name, $table)
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{
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echo " > drop primary key $name ...";
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$time = microtime(true);
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$this->db->createCommand()->dropPrimaryKey($name, $table)->execute();
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echo " done (time: " . sprintf('%.3f', microtime(true) - $time) . "s)\n";
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}
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/**
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* Builds a SQL statement for adding a foreign key constraint to an existing table.
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* The method will properly quote the table and column names.
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* @param string $name the name of the foreign key constraint.
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* @param string $table the table that the foreign key constraint will be added to.
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* @param string $columns the name of the column to that the constraint will be added on. If there are multiple columns, separate them with commas.
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* @param string $refTable the table that the foreign key references to.
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* @param string $refColumns the name of the column that the foreign key references to. If there are multiple columns, separate them with commas.
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* @param string $delete the ON DELETE option. Most DBMS support these options: RESTRICT, CASCADE, NO ACTION, SET DEFAULT, SET NULL
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* @param string $update the ON UPDATE option. Most DBMS support these options: RESTRICT, CASCADE, NO ACTION, SET DEFAULT, SET NULL
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*/
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public function addForeignKey($name, $table, $columns, $refTable, $refColumns, $delete = null, $update = null)
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{
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echo " > add foreign key $name: $table ($columns) references $refTable ($refColumns) ...";
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$time = microtime(true);
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$this->db->createCommand()->addForeignKey($name, $table, $columns, $refTable, $refColumns, $delete, $update)->execute();
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echo " done (time: " . sprintf('%.3f', microtime(true) - $time) . "s)\n";
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}
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/**
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* Builds a SQL statement for dropping a foreign key constraint.
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* @param string $name the name of the foreign key constraint to be dropped. The name will be properly quoted by the method.
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* @param string $table the table whose foreign is to be dropped. The name will be properly quoted by the method.
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*/
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public function dropForeignKey($name, $table)
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{
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echo " > drop foreign key $name from table $table ...";
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$time = microtime(true);
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$this->db->createCommand()->dropForeignKey($name, $table)->execute();
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echo " done (time: " . sprintf('%.3f', microtime(true) - $time) . "s)\n";
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}
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/**
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* Builds and executes a SQL statement for creating a new index.
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* @param string $name the name of the index. The name will be properly quoted by the method.
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* @param string $table the table that the new index will be created for. The table name will be properly quoted by the method.
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* @param string $column the column(s) that should be included in the index. If there are multiple columns, please separate them
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* by commas. The column names will be properly quoted by the method.
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* @param boolean $unique whether to add UNIQUE constraint on the created index.
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*/
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public function createIndex($name, $table, $column, $unique = false)
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{
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echo " > create" . ($unique ? ' unique' : '') . " index $name on $table ($column) ...";
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$time = microtime(true);
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$this->db->createCommand()->createIndex($name, $table, $column, $unique)->execute();
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echo " done (time: " . sprintf('%.3f', microtime(true) - $time) . "s)\n";
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}
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/**
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* Builds and executes a SQL statement for dropping an index.
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* @param string $name the name of the index to be dropped. The name will be properly quoted by the method.
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* @param string $table the table whose index is to be dropped. The name will be properly quoted by the method.
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*/
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public function dropIndex($name, $table)
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{
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echo " > drop index $name ...";
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$time = microtime(true);
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$this->db->createCommand()->dropIndex($name, $table)->execute();
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echo " done (time: " . sprintf('%.3f', microtime(true) - $time) . "s)\n";
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}
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}
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