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                            buildSQL方法返回SQL語句，不執行查詢。
~~~
$sql = $model->buildSQL();
echo $sql;
~~~
輸出結果：
`select * from table`

* * * * *

~~~
$sql = $model2->where(array('id'=>1))->buildSQL();
$model1->where('id = ('. $sql .')')->select();
~~~
執行的SQL語句：`select * from table1 where id = (select * from table2 where id=1)`
上面的代碼是通過buildSQL方法，實現連貫操作子查詢。
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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