O Guia Definitivo do Yii 1.1

uild and execute the following SQL:
// UPDATE `tbl_user` SET `name`=:name WHERE id=:id
$command->update('tbl_user', array(
'name'=>'Tester',
), 'id=:id', array(':id'=>1));
delete
function delete($table, $conditions='', $params=array())
The delete method builds and executes a DELETE SQL statement. The $table parameter
specifies which table to be updated; $conditions and $params are like in where, which
specify the WHERE clause in theDELETE statement. The method will quote the table
name properly.
Below is an example:
// build and execute the following SQL:
// DELETE FROM `tbl_user` WHERE id=:id
$command->delete('tbl_user', 'id=:id', array(':id'=>1));
Building Schema Manipulation Queries
Besides normal data retrieval and manipulation queries, the query builder also offers a set
of methods for building and executing SQL queries that can manipulate the schema of a
database. In particular, it supports the following queries:
• createTable: creates a table
• renameTable: renames a table
• dropTable: drops a table
• truncateTable: truncates a table
• addColumn: adds a table column
• renameColumn: renames a table column
• alterColumn: alters a table column
• dropColumn: drops a table column
• createIndex: creates an index
• dropIndex: drops an index
Info: Although the actual SQL statements for manipulating database schema vary
widely across different DBMS, the query builder attempts to provide a uniform interface
for building these queries. This simplifies the task of migrating a database from one
DBMS to another.
Abstract Data Types
The query builder introduces a set of abstract data types that can be used in defining table
columns. Unlike the physical data types that are specific to particular DBMS and are quite