如何使用sql查找並綁定？

我一直在盯着我的代碼一個多小時，我仍然無法弄清楚我的查詢有什麼問題。我收到錯誤消息：的ActiveRecord :: StatementInvalid：PG ::語法錯誤：錯誤：語法錯誤或接近「）」 38行：？？WHERE（？ABS（AX2 - ）/ <）如何使用sql查找並綁定？

query = %Q{ 

    SELECT 

    avg(ax2), 
    avg(ay2), 
    avg(az2) 

    FROM (

    SELECT 
     avg(t1) as t2, 
     avg(n1) as n2, 
     avg(ax1) as ax2, 
     avg(ay1) as ay2, 
     avg(az1) as az2 

    FROM ( 

     SELECT 
     avg(t) as t1, 
     avg(n) as n1, 
     avg(ax) as ax1, 
     avg(ay) as ay1, 
     avg(az) as az1 

     FROM obds 
     WHERE uid = #{uid} AND (ev = 6011 or ev = 6012) 
     GROUP BY 
     round(t,3), 
     round(n,3) 
    ) 

    AS derivedTable1 
    GROUP BY round(t1 + 0.0005,3), round(n1 + 0.0005,3) 
) 
    AS derivedTable2 
    WHERE (abs(ax2 - ?)/? < ?) #<<<<< Line with error 
} 

binds = [ uid, x_average, x_average, THRESHOLD_FOR_RESTING ] 
result = Ozd.find_by_sql query, binds

來源

2013-10-20 Steven Wolf

的答案是，查詢必須分開綁定數組。

binds = [ query, uid, x_average, x_average, THRESHOLD_FOR_RESTING ] 
results = Ozd.find_by_sql binds

來源

2013-11-26 18:35:05

試試這個WHERE (abs((ax2 - ?)/? < ?))代替

來源

2013-10-20 16:13:44

hey did that worked？ –

你爲什麼要把小於參數放在abs值函數中？ –

oops，可能b我理解錯了.. –

如何使用sql查找並綁定？

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