O Guia Definitivo do Yii 1.1

the new column name. The query builder will quote the table name as well as the column
names properly.
Below is an example showing how to rename a table column:
// ALTER TABLE `tbl_users` CHANGE `name` `username` varchar(255) NOT NULL
renameColumn('tbl_user', 'name', 'username')
alterColumn
function alterColumn($table, $column, $type)
The alterColumn method builds and executes a SQL statement for altering a table column.
The $table parameter specifies the name of the table whose column is to be altered. The
$column parameter specifies the name of the column to be altered. And $type specifies
the new definition of the column. Column definition can contain abstract data type, as
described in the subsection of "createTable". The query builder will quote the table name
as well as the column name properly.
Below is an example showing how to alter a table column:
// ALTER TABLE `tbl_user` CHANGE `username` `username` varchar(255) NOT NULL
alterColumn('tbl_user', 'username', 'string NOT NULL')
addForeignKey
function addForeignKey($name, $table, $columns,
$refTable, $refColumns, $delete=null, $update=null)
The addForeignKey method builds and executes a SQL statement for adding a foreign key
constraint to a table. The $name parameter specifies the name of the foreign key. The
$table and $columns parameters specify the table name and column name that the foreign
key is about. If there are multiple columns, they should be separated by comma
characters. The $refTable and $refColumns parameters specify the table name and
column name that the foreign key references. The $delete and $update parameters
specify the ON DELETE and ON UPDATE options in the SQL statement, respectively.
Most DBMS support these options: RESTRICT, CASCADE, NO ACTION, SET DEFAULT,
SET NULL. The query builder will properly quote the table name, index name and column
name(s).
Below is an example showing how to add a foreign key constraint,