如何在laravel中編寫sql查詢

Question

你好朋友我有這個查詢使用sql編輯器運行，但我不知道如何使用laravel.please編寫這個查詢幫助我。

SELECT 
    date, 
    memo, 
(COALESCE(CASE WHEN drcr = 'dr' THEN amount END,0)) total_debits, 
(COALESCE(CASE WHEN drcr = 'cr' THEN amount END,0)) total_credits, 
@b := @b + (COALESCE(CASE WHEN drcr = 'cr' THEN amount END,0)) - (COALESCE(CASE WHEN drcr = 'dr' THEN amount END,0)) balance 
FROM 
(SELECT @b := 0.0) AS dummy 
CROSS JOIN 
tbl_bankrecords 
ORDER BY 
date 

Answer 1

原始表達式

有時你可能需要在查詢中使用原始的表達。這些表達式將作爲字符串注入查詢中，因此請小心不要創建任何SQL注入點！要創建原始表達式，你可以使用DB ::原始方法：

$users = DB::table('users') 
    ->select(DB::raw('count(*) as user_count, status')) 
    ->where('status', '<>', 1) 
    ->groupBy('status') 
    ->get(); 

Laravel Doc for Raw Queries

另外：

$someVariable = Input::get("some_variable"); 

$results = DB::select(DB::raw("SELECT * FROM some_table WHERE some_col = :somevariable"), array('somevariable' => $someVariable)); 

http://fideloper.com/laravel-raw-queries

Answer 2

你可以試試這個：

Model::select(DB::raw('SELECT 
    date 
,memo 
,(COALESCE(CASE WHEN drcr = 'dr' THEN amount END,0)) total_debits 
,(COALESCE(CASE WHEN drcr = 'cr' THEN amount END,0)) total_credits, 
@b := @b + (COALESCE(CASE WHEN drcr = 'cr' THEN amount END,0)) - (COALESCE(CASE WHEN drcr = 'dr' THEN amount END,0)) balance'))->get();