O Guia Definitivo do Yii 1.1

• where: specifies the WHERE part of the query
• join: appends an inner join query fragment
• leftJoin: appends a left outer join query fragment
• rightJoin: appends a right outer join query fragment
• crossJoin: appends a cross join query fragment
• naturalJoin: appends a natural join query fragment
• group: specifies the GROUP BY part of the query
• having: specifies the HAVING part of the query
• order: specifies the ORDER BY part of the query
• limit: specifies the LIMIT part of the query
• offset: specifies the OFFSET part of the query
• union: appends a UNION query fragment
In the following, we explain how to use these query builder methods. For simplicity, we
assume the underlying database is MySQL. Note that if you are using other DBMS, the
table/column/value quoting shown in the examples may be different.
select
function select($columns='*')
The select method specifies the SELECT part of a query. The $columns parameter
specifies the columns to be selected, which can be either a string representing commaseparated
columns, or an array of column names. Column names can contain table
prefixes and/or column aliases. The method will automatically quote the column names
unless a column contains some parenthesis (which means the column is given as a DB
expression).
Below are some examples:
// SELECT *
select()
// SELECT `id`, `username`
select('id, username')
// SELECT `tbl_user`.`id`, `username` AS `name`
select('tbl_user.id, username as name')
// SELECT `id`, `username`
select(array('id', 'username'))
// SELECT `id`, count(*) as num
select(array('id', 'count(*) as num'))
selectDistinct
function selectDistinct($columns)
The selectDistinct method is similar as select except that it turns on the DISTINCT flag.
For example,selectDistinct('id, username') will generate the following SQL: