yii多表联合查询，
第一种，用command，自己拼接sql语句执行查询
第二种，用AR，model需继承下面的ar，执行queryall或queryrow方法
<?php
//application/components/BaseActiveRecord.php
class BaseActiveRecord extends CActiveRecord{ /**
* Returns the static model of the specified AR class.
* The model returned is a static instance of the AR class.
* It is provided for invoking class-level methods (something similar to static class methods.)
*
* <pre>
* public static function model($className=__CLASS__)
* {
* return parent::model($className);
* }
* </pre>
*
* @param string $className active record class name.
* @return DBActiveRecord active record model instance.
*/
public static function model($className=__CLASS__)
{
return parent::model($className);
} /**
* 获取字段rawName加表别名前缀,主要联表时候防止where条件中字段冲突用的
* @param string $columnName
* @return string
*/
public function getColumnRawName($columnName)
{
$prefix = $this->getTableAlias(true) . '.';
$columns = $this->tableSchema->columns;
if (isset($columns[$columnName]))
{
return $prefix.$columns[$columnName]->rawName;
}
else
{
return $columnName;
}
} /**
*
* @param mixed $criteria
*/
public function queryAll($criteria = NULL)
{
if ( ! empty($criteria))
{
$this->getDbCriteria()->mergeWith($criteria);
} $result = $this->getCommandBuilder()
->createFindCommand($this->tableSchema, $this->getDbCriteria())
->queryAll(); $this->setDbCriteria(NULL); return $result;
} public function queryRow($criteria = NULL)
{
if ($criteria != NULL)
{
$this->getDbCriteria()->mergeWith($criteria);
} $result = $this->getCommandBuilder()
->createFindCommand($this->tableSchema, $this->getDbCriteria())
->queryRow(); $this->setDbCriteria(NULL); return $result;
} public function compare($column, $value, $partialMatch = FALSE, $operator = 'AND')
{
$criteria = new \CDbCriteria;
$column = $this->getColumnRawName($column); if ($value === array())
{
$criteria->condition = "1 = 0";
}
else if ($value === '')
{
$criteria->condition = $column." = ''";
}
else
{
$criteria->compare($column, $value, $partialMatch, $operator, TRUE);
} $this->getDbCriteria()->mergeWith($criteria); return $this;
} }
还有一种就是用ar的relation，做的关联容易忘记，这种不好用！