@ -1,97 +1,117 @@
<?php
/**
* CMysqlSchema class file.
* Migration class file.
*
* @author Qiang Xue < qiang.xue @ gmail . com >
* @link http://www.yiiframework.com/
* @copyright Copyright © 2008-2011 Yii Software LLC
* @copyright Copyright © 2008 Yii Software LLC
* @license http://www.yiiframework.com/license/
*/
namespace yii\db;
/**
* CDbMigration is the base class for representing a database migration.
* Migration is the base class for representing a database migration.
*
* CDb Migration is designed to be used together with the "yiic migrate" command.
* Migration is designed to be used together with the "yiic migrate" command.
*
* Each child class of CDb Migration represents an individual database migration which
* Each child class of Migration represents an individual database migration which
* is identified by the child class name.
*
* Within each migration, the {@link up} method contains the logic for "upgrading"
* the database used in an application; while the {@link down} method contains "downgrading"
* Within each migration, the [[up()]] method should be overwritten to contain the logic
* for "upgrading" the database; while the [[down()]] method for the "downgrading"
* logic. The "yiic migrate" command manages all available migrations in an application.
*
* CDbMigration provides a set of convenient methods for manipulating database data and schema.
* For example, the {@link insert} method can be used to easily insert a row of data into
* a database table; the {@link createTable} method can be used to create a database table.
* Compared with the same methods in {@link CDbCommand}, these methods will display extra
* If the database supports transactions, you may also overwrite [[safeUp()]] and
* [[safeDown()]] so that if anything wrong happens during the upgrading or downgrading,
* the whole migration can be reverted in a whole.
*
* Migration provides a set of convenient methods for manipulating database data and schema.
* For example, the [[insert()]] method can be used to easily insert a row of data into
* a database table; the [[createTable()]] method can be used to create a database table.
* Compared with the same methods in [[Command]], these methods will display extra
* information showing the method parameters and execution time, which may be useful when
* applying migrations.
*
* @author Qiang Xue < qiang.xue @ gmail . com >
* @since 2.0
*/
abstract class CDb Migration extends yii\base\Component
class Migration extends \ yii\base\Component
{
private $_db;
/**
* @var Connection the database connection that this migration should work with.
* If not set, it will be initialized as the 'db' application component.
*/
public $db;
/**
* Initializes the migration.
* This method will set [[db]] to be the 'db' application component, if it is null.
*/
public function init()
{
parent::init();
if ($this->db === null) {
$this->db = \Yii::$application->getComponent('db');
}
}
/**
* This method contains the logic to be executed when applying this migration.
* Child classes may implement this method to provide actual migration logic.
* @return boolean
* Child classes may overwrite this method to provide actual migration logic.
* @return boolean return a false value to indicate the migration fails
* and should not proceed further. All other return values mean the migration succeeds.
*/
public function up()
{
$transaction = $this->getDbConnection()->beginTransaction();
try
{
$transaction = $this->db->beginTransaction();
try {
if ($this->safeUp() === false) {
$transaction->rollBack();
return false;
}
$transaction->commit();
}
catch (Exception $e)
{
} catch (\Exception $e) {
echo "Exception: " . $e->getMessage() . ' (' . $e->getFile() . ':' . $e->getLine() . ")\n";
echo $e->getTraceAsString() . "\n";
$transaction->rollBack();
return false;
}
return null;
}
/**
* This method contains the logic to be executed when removing this migration.
* The default implementation throws an exception indicating the migration cannot be removed.
* Child classes may override this method if the corresponding migrations can be removed.
* @return boolean
* @return boolean return a false value to indicate the migration fails
* and should not proceed further. All other return values mean the migration succeeds.
*/
public function down()
{
$transaction = $this->getDbConnection()->beginTransaction();
try
{
$transaction = $this->db->beginTransaction();
try {
if ($this->safeDown() === false) {
$transaction->rollBack();
return false;
}
$transaction->commit();
}
catch (Exception $e)
{
} catch (\Exception $e) {
echo "Exception: " . $e->getMessage() . ' (' . $e->getFile() . ':' . $e->getLine() . ")\n";
echo $e->getTraceAsString() . "\n";
$transaction->rollBack();
return false;
}
return null;
}
/**
* This method contains the logic to be executed when applying this migration.
* This method differs from {@link up} in that the DB logic implemented here will
* This method differs from [[up()]] in that the DB logic implemented here will
* be enclosed within a DB transaction.
* Child classes may implement this method instead of {@link up} if the DB logic
* Child classes may implement this method instead of [[up()]] if the DB logic
* needs to be within a transaction.
* @return boolean
* @return boolean return a false value to indicate the migration fails
* and should not proceed further. All other return values mean the migration succeeds.
*/
public function safeUp()
{
@ -99,55 +119,28 @@ abstract class CDbMigration extends yii\base\Component
/**
* This method contains the logic to be executed when removing this migration.
* This method differs from {@link down} in that the DB logic implemented here will
* This method differs from [[down()]] in that the DB logic implemented here will
* be enclosed within a DB transaction.
* Child classes may implement this method instead of {@link up} if the DB logic
* Child classes may implement this method instead of [[up()]] if the DB logic
* needs to be within a transaction.
* @return boolean
* @return boolean return a false value to indicate the migration fails
* and should not proceed further. All other return values mean the migration succeeds.
*/
public function safeDown()
{
}
/**
* Returns the currently active database connection.
* By default, the 'db' application component will be returned and activated.
* You can call {@link setDbConnection} to switch to a different database connection.
* Methods such as {@link insert}, {@link createTable} will use this database connection
* to perform DB queries.
* @return CDbConnection the currently active database connection
*/
public function getDbConnection()
{
if ($this->_db === null) {
$this->_db = \Yii::$application->getComponent('db');
if (!$this->_db instanceof CDbConnection)
throw new CException(Yii::t('yii', 'The "db" application component must be configured to be a CDbConnection object.'));
}
return $this->_db;
}
/**
* Sets the currently active database connection.
* The database connection will be used by the methods such as {@link insert}, {@link createTable}.
* @param CDbConnection $db the database connection component
*/
public function setDbConnection($db)
{
$this->_db = $db;
}
/**
* Executes a SQL statement.
* This method executes the specified SQL statement using {@link dbConnection} .
* This method executes the specified SQL statement using [[db]].
* @param string $sql the SQL statement to be executed
* @param array $params input parameters (name=>value) for the SQL execution. See {@link CDbCommand::execute} for more details.
* @param array $params input parameters (name=>value) for the SQL execution. See [[Command::execute()]] for more details.
*/
public function execute($sql, $params = array())
{
echo " > execute SQL: $sql ...";
$time = microtime(true);
$this->getDbConnection() ->createCommand($sql)->execute($params);
$this->db->createCommand($sql)->execute($params);
echo " done (time: " . sprintf('%.3f', microtime(true) - $time) . "s)\n";
}
@ -161,7 +154,7 @@ abstract class CDbMigration extends yii\base\Component
{
echo " > insert into $table ...";
$time = microtime(true);
$this->getDbConnection()->createCommand()->insert($table, $columns );
$this->db->createCommand()->insert($table, $columns)->execute( );
echo " done (time: " . sprintf('%.3f', microtime(true) - $time) . "s)\n";
}
@ -170,30 +163,30 @@ abstract class CDbMigration extends yii\base\Component
* The method will properly escape the column names and bind the values to be updated.
* @param string $table the table to be updated.
* @param array $columns the column data (name=>value) to be updated.
* @param mixed $conditions the conditions that will be put in the WHERE part. Please
* refer to {@link CDbCommand::where} on how to specify conditions.
* @param mixed $condition the conditions that will be put in the WHERE part. Please
* refer to [[Query::where()]] on how to specify conditions.
* @param array $params the parameters to be bound to the query.
*/
public function update($table, $columns, $conditions = '', $params = array())
public function update($table, $columns, $condition = '', $params = array())
{
echo " > update $table ...";
$time = microtime(true);
$this->getDbConnection() ->createCommand()->update($table, $columns, $conditions , $params);
$this->db ->createCommand()->update($table, $columns, $condition, $params)->execute( );
echo " done (time: " . sprintf('%.3f', microtime(true) - $time) . "s)\n";
}
/**
* Creates and executes a DELETE SQL statement.
* @param string $table the table where the data will be deleted from.
* @param mixed $conditions the conditions that will be put in the WHERE part. Please
* refer to {@link CDbCommand::where} on how to specify conditions.
* @param mixed $condition the conditions that will be put in the WHERE part. Please
* refer to [[Query::where()]] on how to specify conditions.
* @param array $params the parameters to be bound to the query.
*/
public function delete($table, $conditions = '', $params = array())
public function delete($table, $condition = '', $params = array())
{
echo " > delete from $table ...";
$time = microtime(true);
$this->getDbConnection() ->createCommand()->delete($table, $conditions , $params);
$this->db ->createCommand()->delete($table, $condition, $params)->execute( );
echo " done (time: " . sprintf('%.3f', microtime(true) - $time) . "s)\n";
}
@ -203,10 +196,11 @@ abstract class CDbMigration extends yii\base\Component
* The columns in the new table should be specified as name-definition pairs (e.g. 'name'=>'string'),
* where name stands for a column name which will be properly quoted by the method, and definition
* stands for the column type which can contain an abstract DB type.
* The {@link getColumnType} method will be invoked to convert any abstract type into a physical one.
*
* The [[QueryBuilder::getColumnType()]] method will be invoked to convert any abstract type into a physical one.
*
* If a column is specified with definition only (e.g. 'PRIMARY KEY (name, type)'), it will be directly
* inserted into the generated SQL.
* put into the generated SQL.
*
* @param string $table the name of the table to be created. The name will be properly quoted by the method.
* @param array $columns the columns (name=>definition) in the new table.
@ -216,7 +210,7 @@ abstract class CDbMigration extends yii\base\Component
{
echo " > create table $table ...";
$time = microtime(true);
$this->getDbConnection() ->createCommand()->createTable($table, $columns, $options);
$this->db ->createCommand()->createTable($table, $columns, $options)->execute( );
echo " done (time: " . sprintf('%.3f', microtime(true) - $time) . "s)\n";
}
@ -229,7 +223,7 @@ abstract class CDbMigration extends yii\base\Component
{
echo " > rename table $table to $newName ...";
$time = microtime(true);
$this->getDbConnection() ->createCommand()->renameTable($table, $newName);
$this->db ->createCommand()->renameTable($table, $newName)->execute( );
echo " done (time: " . sprintf('%.3f', microtime(true) - $time) . "s)\n";
}
@ -241,7 +235,7 @@ abstract class CDbMigration extends yii\base\Component
{
echo " > drop table $table ...";
$time = microtime(true);
$this->getDbConnection()->createCommand()->dropTable($table );
$this->db->createCommand()->dropTable($table)->execute( );
echo " done (time: " . sprintf('%.3f', microtime(true) - $time) . "s)\n";
}
@ -253,7 +247,7 @@ abstract class CDbMigration extends yii\base\Component
{
echo " > truncate table $table ...";
$time = microtime(true);
$this->getDbConnection()->createCommand()->truncateTable($table );
$this->db->createCommand()->truncateTable($table)->execute( );
echo " done (time: " . sprintf('%.3f', microtime(true) - $time) . "s)\n";
}
@ -261,7 +255,7 @@ abstract class CDbMigration extends yii\base\Component
* Builds and executes a SQL statement for adding a new DB column.
* @param string $table the table that the new column will be added to. The table name will be properly quoted by the method.
* @param string $column the name of the new column. The name will be properly quoted by the method.
* @param string $type the column type. The {@link getColumnType} method will be invoked to convert abstract column type (if any)
* @param string $type the column type. The [[QueryBuilder::getColumnType()]] method will be invoked to convert abstract column type (if any)
* into the physical one. Anything that is not recognized as abstract type will be kept in the generated SQL.
* For example, 'string' will be turned into 'varchar(255)', while 'string not null' will become 'varchar(255) not null'.
*/
@ -269,7 +263,7 @@ abstract class CDbMigration extends yii\base\Component
{
echo " > add column $column $type to table $table ...";
$time = microtime(true);
$this->getDbConnection() ->createCommand()->addColumn($table, $column, $type);
$this->db ->createCommand()->addColumn($table, $column, $type)->execute( );
echo " done (time: " . sprintf('%.3f', microtime(true) - $time) . "s)\n";
}
@ -282,7 +276,7 @@ abstract class CDbMigration extends yii\base\Component
{
echo " > drop column $column from table $table ...";
$time = microtime(true);
$this->getDbConnection() ->createCommand()->dropColumn($table, $column);
$this->db ->createCommand()->dropColumn($table, $column)->execute( );
echo " done (time: " . sprintf('%.3f', microtime(true) - $time) . "s)\n";
}
@ -296,7 +290,7 @@ abstract class CDbMigration extends yii\base\Component
{
echo " > rename column $name in table $table to $newName ...";
$time = microtime(true);
$this->getDbConnection() ->createCommand()->renameColumn($table, $name, $newName);
$this->db ->createCommand()->renameColumn($table, $name, $newName)->execute( );
echo " done (time: " . sprintf('%.3f', microtime(true) - $time) . "s)\n";
}
@ -312,7 +306,7 @@ abstract class CDbMigration extends yii\base\Component
{
echo " > alter column $column in table $table to $type ...";
$time = microtime(true);
$this->getDbConnection() ->createCommand()->alterColumn($table, $column, $type);
$this->db ->createCommand()->alterColumn($table, $column, $type)->execute( );
echo " done (time: " . sprintf('%.3f', microtime(true) - $time) . "s)\n";
}
@ -331,7 +325,7 @@ abstract class CDbMigration extends yii\base\Component
{
echo " > add foreign key $name: $table ($columns) references $refTable ($refColumns) ...";
$time = microtime(true);
$this->getDbConnection() ->createCommand()->addForeignKey($name, $table, $columns, $refTable, $refColumns, $delete, $update);
$this->db ->createCommand()->addForeignKey($name, $table, $columns, $refTable, $refColumns, $delete, $update)->execute( );
echo " done (time: " . sprintf('%.3f', microtime(true) - $time) . "s)\n";
}
@ -344,7 +338,7 @@ abstract class CDbMigration extends yii\base\Component
{
echo " > drop foreign key $name from table $table ...";
$time = microtime(true);
$this->getDbConnection() ->createCommand()->dropForeignKey($name, $table);
$this->db ->createCommand()->dropForeignKey($name, $table)->execute( );
echo " done (time: " . sprintf('%.3f', microtime(true) - $time) . "s)\n";
}
@ -360,7 +354,7 @@ abstract class CDbMigration extends yii\base\Component
{
echo " > create" . ($unique ? ' unique' : '') . " index $name on $table ($column) ...";
$time = microtime(true);
$this->getDbConnection() ->createCommand()->createIndex($name, $table, $column, $unique);
$this->db ->createCommand()->createIndex($name, $table, $column, $unique)->execute( );
echo " done (time: " . sprintf('%.3f', microtime(true) - $time) . "s)\n";
}
@ -373,7 +367,7 @@ abstract class CDbMigration extends yii\base\Component
{
echo " > drop index $name ...";
$time = microtime(true);
$this->getDbConnection()->createCommand()->dropIndex($name, $table );
$this->db->createCommand()->dropIndex($name, $table)->execute( );
echo " done (time: " . sprintf('%.3f', microtime(true) - $time) . "s)\n";
}
}
Qiang Xue
12 years ago