yiisoft /
yii2
Complex classes like Migration often do a lot of different things. To break such a class down, we need to identify a cohesive component within that class. A common approach to find such a component is to look for fields/methods that share the same prefixes, or suffixes. You can also have a look at the cohesion graph to spot any un-connected, or weakly-connected components.
Once you have determined the fields that belong together, you can apply the Extract Class refactoring. If the component makes sense as a sub-class, Extract Subclass is also a candidate, and is often faster.
While breaking up the class, it is a good idea to analyze how other classes use Migration, and based on these observations, apply Extract Interface, too.
| 1 | <?php |
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| 41 | class Migration extends Component implements MigrationInterface |
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| 42 | { |
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| 43 | use SchemaBuilderTrait; |
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| 44 | |||
| 45 | /** |
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| 46 | * @var Connection|array|string the DB connection object or the application component ID of the DB connection |
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| 47 | * that this migration should work with. Starting from version 2.0.2, this can also be a configuration array |
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| 48 | * for creating the object. |
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| 49 | * |
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| 50 | * Note that when a Migration object is created by the `migrate` command, this property will be overwritten |
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| 51 | * by the command. If you do not want to use the DB connection provided by the command, you may override |
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| 52 | * the [[init()]] method like the following: |
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| 53 | * |
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| 54 | * ```php |
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| 55 | * public function init() |
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| 56 | * { |
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| 57 | * $this->db = 'db2'; |
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| 58 | * parent::init(); |
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| 59 | * } |
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| 60 | * ``` |
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| 61 | */ |
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| 62 | public $db = 'db'; |
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| 63 | |||
| 64 | |||
| 65 | /** |
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| 66 | * Initializes the migration. |
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| 67 | * This method will set [[db]] to be the 'db' application component, if it is `null`. |
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| 68 | */ |
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| 69 | 13 | public function init() |
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| 76 | |||
| 77 | /** |
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| 78 | * @inheritdoc |
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| 79 | * @since 2.0.6 |
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| 80 | */ |
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| 81 | 1 | protected function getDb() |
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| 85 | |||
| 86 | /** |
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| 87 | * This method contains the logic to be executed when applying this migration. |
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| 88 | * Child classes may override this method to provide actual migration logic. |
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| 89 | * @return bool return a false value to indicate the migration fails |
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| 90 | * and should not proceed further. All other return values mean the migration succeeds. |
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| 91 | */ |
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| 92 | public function up() |
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| 113 | |||
| 114 | /** |
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| 115 | * This method contains the logic to be executed when removing this migration. |
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| 116 | * The default implementation throws an exception indicating the migration cannot be removed. |
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| 117 | * Child classes may override this method if the corresponding migrations can be removed. |
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| 118 | * @return bool return a false value to indicate the migration fails |
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| 119 | * and should not proceed further. All other return values mean the migration succeeds. |
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| 120 | */ |
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| 121 | public function down() |
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| 142 | |||
| 143 | /** |
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| 144 | * @param \Throwable|\Exception $e |
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| 145 | */ |
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| 146 | private function printException($e) |
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| 151 | |||
| 152 | /** |
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| 153 | * This method contains the logic to be executed when applying this migration. |
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| 154 | * This method differs from [[up()]] in that the DB logic implemented here will |
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| 155 | * be enclosed within a DB transaction. |
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| 156 | * Child classes may implement this method instead of [[up()]] if the DB logic |
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| 157 | * needs to be within a transaction. |
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| 158 | * @return bool return a false value to indicate the migration fails |
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| 159 | * and should not proceed further. All other return values mean the migration succeeds. |
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| 160 | */ |
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| 161 | public function safeUp() |
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| 164 | |||
| 165 | /** |
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| 166 | * This method contains the logic to be executed when removing this migration. |
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| 167 | * This method differs from [[down()]] in that the DB logic implemented here will |
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| 168 | * be enclosed within a DB transaction. |
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| 169 | * Child classes may implement this method instead of [[down()]] if the DB logic |
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| 170 | * needs to be within a transaction. |
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| 171 | * @return bool return a false value to indicate the migration fails |
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| 172 | * and should not proceed further. All other return values mean the migration succeeds. |
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| 173 | */ |
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| 174 | public function safeDown() |
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| 177 | |||
| 178 | /** |
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| 179 | * Executes a SQL statement. |
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| 180 | * This method executes the specified SQL statement using [[db]]. |
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| 181 | * @param string $sql the SQL statement to be executed |
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| 182 | * @param array $params input parameters (name => value) for the SQL execution. |
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| 183 | * See [[Command::execute()]] for more details. |
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| 184 | */ |
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| 185 | public function execute($sql, $params = []) |
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| 192 | |||
| 193 | /** |
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| 194 | * Creates and executes an INSERT SQL statement. |
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| 195 | * The method will properly escape the column names, and bind the values to be inserted. |
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| 196 | * @param string $table the table that new rows will be inserted into. |
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| 197 | * @param array $columns the column data (name => value) to be inserted into the table. |
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| 198 | */ |
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| 199 | public function insert($table, $columns) |
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| 206 | |||
| 207 | /** |
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| 208 | * Creates and executes an batch INSERT SQL statement. |
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| 209 | * The method will properly escape the column names, and bind the values to be inserted. |
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| 210 | * @param string $table the table that new rows will be inserted into. |
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| 211 | * @param array $columns the column names. |
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| 212 | * @param array $rows the rows to be batch inserted into the table |
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| 213 | */ |
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| 214 | public function batchInsert($table, $columns, $rows) |
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| 221 | |||
| 222 | /** |
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| 223 | * Creates and executes an UPDATE SQL statement. |
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| 224 | * The method will properly escape the column names and bind the values to be updated. |
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| 225 | * @param string $table the table to be updated. |
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| 226 | * @param array $columns the column data (name => value) to be updated. |
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| 227 | * @param array|string $condition the conditions that will be put in the WHERE part. Please |
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| 228 | * refer to [[Query::where()]] on how to specify conditions. |
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| 229 | * @param array $params the parameters to be bound to the query. |
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| 230 | */ |
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| 231 | public function update($table, $columns, $condition = '', $params = []) |
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| 238 | |||
| 239 | /** |
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| 240 | * Creates and executes a DELETE SQL statement. |
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| 241 | * @param string $table the table where the data will be deleted from. |
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| 242 | * @param array|string $condition the conditions that will be put in the WHERE part. Please |
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| 243 | * refer to [[Query::where()]] on how to specify conditions. |
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| 244 | * @param array $params the parameters to be bound to the query. |
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| 245 | */ |
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| 246 | public function delete($table, $condition = '', $params = []) |
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| 253 | |||
| 254 | /** |
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| 255 | * Builds and executes a SQL statement for creating a new DB table. |
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| 256 | * |
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| 257 | * The columns in the new table should be specified as name-definition pairs (e.g. 'name' => 'string'), |
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| 258 | * where name stands for a column name which will be properly quoted by the method, and definition |
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| 259 | * stands for the column type which can contain an abstract DB type. |
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| 260 | * |
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| 261 | * The [[QueryBuilder::getColumnType()]] method will be invoked to convert any abstract type into a physical one. |
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| 262 | * |
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| 263 | * If a column is specified with definition only (e.g. 'PRIMARY KEY (name, type)'), it will be directly |
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| 264 | * put into the generated SQL. |
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| 265 | * |
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| 266 | * @param string $table the name of the table to be created. The name will be properly quoted by the method. |
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| 267 | * @param array $columns the columns (name => definition) in the new table. |
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| 268 | * @param string $options additional SQL fragment that will be appended to the generated SQL. |
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| 269 | */ |
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| 270 | 1 | public function createTable($table, $columns, $options = null) |
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| 282 | |||
| 283 | /** |
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| 284 | * Builds and executes a SQL statement for renaming a DB table. |
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| 285 | * @param string $table the table to be renamed. The name will be properly quoted by the method. |
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| 286 | * @param string $newName the new table name. The name will be properly quoted by the method. |
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| 287 | */ |
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| 288 | public function renameTable($table, $newName) |
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| 295 | |||
| 296 | /** |
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| 297 | * Builds and executes a SQL statement for dropping a DB table. |
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| 298 | * @param string $table the table to be dropped. The name will be properly quoted by the method. |
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| 299 | */ |
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| 300 | 1 | public function dropTable($table) |
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| 307 | |||
| 308 | /** |
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| 309 | * Builds and executes a SQL statement for truncating a DB table. |
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| 310 | * @param string $table the table to be truncated. The name will be properly quoted by the method. |
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| 311 | */ |
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| 312 | public function truncateTable($table) |
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| 319 | |||
| 320 | /** |
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| 321 | * Builds and executes a SQL statement for adding a new DB column. |
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| 322 | * @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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| 323 | * @param string $column the name of the new column. The name will be properly quoted by the method. |
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| 324 | * @param string $type the column type. The [[QueryBuilder::getColumnType()]] method will be invoked to convert abstract column type (if any) |
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| 325 | * into the physical one. Anything that is not recognized as abstract type will be kept in the generated SQL. |
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| 326 | * For example, 'string' will be turned into 'varchar(255)', while 'string not null' will become 'varchar(255) not null'. |
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| 327 | */ |
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| 328 | public function addColumn($table, $column, $type) |
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| 338 | |||
| 339 | /** |
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| 340 | * Builds and executes a SQL statement for dropping a DB column. |
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| 341 | * @param string $table the table whose column is to be dropped. The name will be properly quoted by the method. |
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| 342 | * @param string $column the name of the column to be dropped. The name will be properly quoted by the method. |
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| 343 | */ |
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| 344 | public function dropColumn($table, $column) |
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| 351 | |||
| 352 | /** |
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| 353 | * Builds and executes a SQL statement for renaming a column. |
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| 354 | * @param string $table the table whose column is to be renamed. The name will be properly quoted by the method. |
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| 355 | * @param string $name the old name of the column. The name will be properly quoted by the method. |
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| 356 | * @param string $newName the new name of the column. The name will be properly quoted by the method. |
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| 357 | */ |
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| 358 | public function renameColumn($table, $name, $newName) |
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| 365 | |||
| 366 | /** |
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| 367 | * Builds and executes a SQL statement for changing the definition of a column. |
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| 368 | * @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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| 369 | * @param string $column the name of the column to be changed. The name will be properly quoted by the method. |
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| 370 | * @param string $type the new column type. The [[QueryBuilder::getColumnType()]] method will be invoked to convert abstract column type (if any) |
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| 371 | * into the physical one. Anything that is not recognized as abstract type will be kept in the generated SQL. |
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| 372 | * For example, 'string' will be turned into 'varchar(255)', while 'string not null' will become 'varchar(255) not null'. |
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| 373 | */ |
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| 374 | public function alterColumn($table, $column, $type) |
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| 384 | |||
| 385 | /** |
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| 386 | * Builds and executes a SQL statement for creating a primary key. |
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| 387 | * The method will properly quote the table and column names. |
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| 388 | * @param string $name the name of the primary key constraint. |
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| 389 | * @param string $table the table that the primary key constraint will be added to. |
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| 390 | * @param string|array $columns comma separated string or array of columns that the primary key will consist of. |
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| 391 | */ |
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| 392 | public function addPrimaryKey($name, $table, $columns) |
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| 399 | |||
| 400 | /** |
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| 401 | * Builds and executes a SQL statement for dropping a primary key. |
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| 402 | * @param string $name the name of the primary key constraint to be removed. |
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| 403 | * @param string $table the table that the primary key constraint will be removed from. |
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| 404 | */ |
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| 405 | public function dropPrimaryKey($name, $table) |
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| 412 | |||
| 413 | /** |
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| 414 | * Builds a SQL statement for adding a foreign key constraint to an existing table. |
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| 415 | * The method will properly quote the table and column names. |
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| 416 | * @param string $name the name of the foreign key constraint. |
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| 417 | * @param string $table the table that the foreign key constraint will be added to. |
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| 418 | * @param string|array $columns the name of the column to that the constraint will be added on. If there are multiple columns, separate them with commas or use an array. |
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| 419 | * @param string $refTable the table that the foreign key references to. |
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| 420 | * @param string|array $refColumns the name of the column that the foreign key references to. If there are multiple columns, separate them with commas or use an array. |
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| 421 | * @param string $delete the ON DELETE option. Most DBMS support these options: RESTRICT, CASCADE, NO ACTION, SET DEFAULT, SET NULL |
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| 422 | * @param string $update the ON UPDATE option. Most DBMS support these options: RESTRICT, CASCADE, NO ACTION, SET DEFAULT, SET NULL |
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| 423 | */ |
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| 424 | public function addForeignKey($name, $table, $columns, $refTable, $refColumns, $delete = null, $update = null) |
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| 431 | |||
| 432 | /** |
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| 433 | * Builds a SQL statement for dropping a foreign key constraint. |
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| 434 | * @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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| 435 | * @param string $table the table whose foreign is to be dropped. The name will be properly quoted by the method. |
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| 436 | */ |
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| 437 | public function dropForeignKey($name, $table) |
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| 444 | |||
| 445 | /** |
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| 446 | * Builds and executes a SQL statement for creating a new index. |
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| 447 | * @param string $name the name of the index. The name will be properly quoted by the method. |
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| 448 | * @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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| 449 | * @param string|array $columns the column(s) that should be included in the index. If there are multiple columns, please separate them |
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| 450 | * by commas or use an array. Each column name will be properly quoted by the method. Quoting will be skipped for column names that |
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| 451 | * include a left parenthesis "(". |
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| 452 | * @param bool $unique whether to add UNIQUE constraint on the created index. |
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| 453 | */ |
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| 454 | public function createIndex($name, $table, $columns, $unique = false) |
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| 461 | |||
| 462 | /** |
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| 463 | * Builds and executes a SQL statement for dropping an index. |
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| 464 | * @param string $name the name of the index to be dropped. The name will be properly quoted by the method. |
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| 465 | * @param string $table the table whose index is to be dropped. The name will be properly quoted by the method. |
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| 466 | */ |
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| 467 | public function dropIndex($name, $table) |
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| 474 | |||
| 475 | /** |
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| 476 | * Builds and execute a SQL statement for adding comment to column |
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| 477 | * |
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| 478 | * @param string $table the table whose column is to be commented. The table name will be properly quoted by the method. |
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| 479 | * @param string $column the name of the column to be commented. The column name will be properly quoted by the method. |
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| 480 | * @param string $comment the text of the comment to be added. The comment will be properly quoted by the method. |
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| 481 | * @since 2.0.8 |
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| 482 | */ |
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| 483 | public function addCommentOnColumn($table, $column, $comment) |
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| 490 | |||
| 491 | /** |
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| 492 | * Builds a SQL statement for adding comment to table |
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| 493 | * |
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| 494 | * @param string $table the table whose column is to be commented. The table name will be properly quoted by the method. |
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| 495 | * @param string $comment the text of the comment to be added. The comment will be properly quoted by the method. |
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| 496 | * @since 2.0.8 |
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| 497 | */ |
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| 498 | public function addCommentOnTable($table, $comment) |
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| 505 | |||
| 506 | /** |
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| 507 | * Builds and execute a SQL statement for dropping comment from column |
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| 508 | * |
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| 509 | * @param string $table the table whose column is to be commented. The table name will be properly quoted by the method. |
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| 510 | * @param string $column the name of the column to be commented. The column name will be properly quoted by the method. |
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| 511 | * @since 2.0.8 |
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| 512 | */ |
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| 513 | public function dropCommentFromColumn($table, $column) |
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| 520 | |||
| 521 | /** |
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| 522 | * Builds a SQL statement for dropping comment from table |
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| 523 | * |
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| 524 | * @param string $table the table whose column is to be commented. The table name will be properly quoted by the method. |
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| 525 | * @since 2.0.8 |
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| 526 | */ |
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| 527 | public function dropCommentFromTable($table) |
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| 534 | } |
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| 535 |
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