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測(cè)試

避免重復(fù)通常是2種形式的去重結(jié)合使用較為妥當(dāng)，客戶(hù)端去重和服務(wù)端去重：

客戶(hù)端去重也就是js代碼中利用前端緩存在用戶(hù)輸入時(shí)對(duì)當(dāng)前的context中的數(shù)據(jù)首先進(jìn)行去重。

當(dāng)客戶(hù)端通過(guò)以后，服務(wù)端去重有2中方法，首先根據(jù)業(yè)務(wù)邏輯的唯一性選擇，數(shù)據(jù)庫(kù)unique約束。其次在insert之前如果允許對(duì)重復(fù)

記錄刪除則先刪除重復(fù)記錄再insert。再次如果害怕誤刪，可以對(duì)重復(fù)的數(shù)據(jù)標(biāo)記刪除（假刪除）并設(shè)置允許保留時(shí)間或者歸檔來(lái)減小表的占用空間。

校驗(yàn)或者數(shù)據(jù)表設(shè)置唯一鍵

插入之前，先查詢(xún)校驗(yàn)