Oracle + Entity Framework 更新沒有設置主鍵的表

最近用Entity Framework 開發的時候，發現一個問題，在默認狀況下，EF不能對一個沒有主鍵的表進行更新、插入和刪除的動做。

那麼，應該怎麼處理沒有主鍵的表呢？

咱們打開這個表的edmx文件，能夠看到如下的xml片斷

<EntitySet Name="REP" EntityType="Model.Store.REP" store:Type="Tables" store:Schema="FOREST" store:Name="REP">
            <DefiningQuery>SELECT 
      "REP"."ZONE" AS "ZONE", 
      "REP"."NO" AS "NO", 
      "REP"."HELP_NO" AS "HELP_NO", 
      "REP"."NO_TYPE" AS "NO_TYPE", 
      "REP"."ID_NO" AS "ID_NO", 
      "REP"."NAME" AS "NAME", 
      "REP"."TEL" AS "TEL", 
      "REP"."MAIL_NO" AS "MAIL_NO", 
      "REP"."ADDRESS1" AS "ADDRESS1", 
      "REP"."ADDRESS2" AS "ADDRESS2", 
      "REP"."JOINDATE" AS "JOINDATE", 
      "REP"."ELITE_D" AS "ELITE_D", 
      "REP"."PD1" AS "PD1", 
      "REP"."CUR_CPS" AS "CUR_CPS", 
      "REP"."PREV_CPS1" AS "PREV_CPS1", 
      "REP"."YEAR_CPS" AS "YEAR_CPS", 
      "REP"."IA_CPS" AS "IA_CPS", 
      "REP"."PREV_BAL" AS "PREV_BAL", 
      "REP"."CUR_BAL" AS "CUR_BAL", 
      "REP"."ELITE" AS "ELITE", 
      "REP"."CUR_CAMP" AS "CUR_CAMP", 
      "REP"."SALES" AS "SALES", 
      "REP"."RETURN" AS "RETURN", 
      "REP"."NO_ACT" AS "NO_ACT", 
      "REP"."PD_NO" AS "PD_NO", 
      "REP"."CUR_ORDER" AS "CUR_ORDER", 
      "REP"."BIRTHDAY" AS "BIRTHDAY", 
      "REP"."RNAM" AS "RNAM", 
      "REP"."POST_YN" AS "POST_YN", 
      "REP"."CARD_NO" AS "CARD_NO", 
      "REP"."CARD_YYYYMM" AS "CARD_YYYYMM", 
      "REP"."TEL2" AS "TEL2", 
      "REP"."MOBILE" AS "MOBILE", 
      "REP"."EMAIL" AS "EMAIL", 
      "REP"."PREV_CPS2" AS "PREV_CPS2", 
      "REP"."SEMAIL" AS "SEMAIL", 
      "REP"."PASSWORD" AS "PASSWORD", 
      "REP"."NEXT_CPS" AS "NEXT_CPS", 
      "REP"."TRAN_D" AS "TRAN_D", 
      "REP"."PASS_CNT" AS "PASS_CNT", 
      "REP"."ORDER_CT" AS "ORDER_CT", 
      "REP"."ORDER_AT" AS "ORDER_AT", 
      "REP"."SNAME" AS "SNAME", 
      "REP"."NOTES1" AS "NOTES1", 
      "REP"."NOTES2" AS "NOTES2", 
      "REP"."PPWD" AS "PPWD", 
      "REP"."SALES6" AS "SALES6", 
      "REP"."NO5" AS "NO5", 
      "REP"."SALES4" AS "SALES4", 
      "REP"."DELIVER" AS "DELIVER", 
      "REP"."ISWHWB" AS "ISWHWB", 
      "REP"."LOS" AS "LOS", 
      "REP"."CREDITLINE" AS "CREDITLINE", 
      "REP"."OCCUPATION" AS "OCCUPATION", 
      "REP"."ENTRYLOCATION" AS "ENTRYLOCATION", 
      "REP"."SOURCE" AS "SOURCE", 
      "REP"."SURVEYTAG" AS "SURVEYTAG", 
      "REP"."HMDATE" AS "HMDATE", 
      "REP"."ISRCVSMS" AS "ISRCVSMS", 
      "REP"."PAYMETHOD" AS "PAYMETHOD", 
      "REP"."ISPBAMCOURSE" AS "ISPBAMCOURSE", 
      "REP"."ISBSDCOURSE" AS "ISBSDCOURSE", 
      "REP"."BSADATE" AS "BSADATE", 
      "REP"."CUR_NETSALES" AS "CUR_NETSALES", 
      "REP"."WEBPCDATE" AS "WEBPCDATE", 
      "REP"."WEBPC" AS "WEBPC", 
      "REP"."ISMCNOTICE" AS "ISMCNOTICE", 
      "REP"."OLDNO" AS "OLDNO", 
      "REP"."EMAILACCOUNT" AS "EMAILACCOUNT", 
      "REP"."MCDATE" AS "MCDATE", 
      "REP"."PASS_CRTDATE" AS "PASS_CRTDATE", 
      "REP"."STARXNO" AS "STARXNO", 
      "REP"."ZONEID" AS "ZONEID", 
      "REP"."ORDER_INFO" AS "ORDER_INFO", 
      "REP"."TRAN_D_EC_DATE" AS "TRAN_D_EC_DATE", 
      "REP"."REALTITLEID" AS "REALTITLEID", 
      "REP"."PAIDTITLEID" AS "PAIDTITLEID", 
      "REP"."PUBLICTITLEID" AS "PUBLICTITLEID", 
      "REP"."ISASLF" AS "ISASLF", 
      "REP"."ASLFROSTARTCAMP" AS "ASLFROSTARTCAMP", 
      "REP"."ASLFROENDCAMP" AS "ASLFROENDCAMP", 
      "REP"."ISVIRTUALID" AS "ISVIRTUALID", 
      "REP"."ASLFSPONSORID" AS "ASLFSPONSORID", 
      "REP"."MPCACTCPS" AS "MPCACTCPS", 
      "REP"."MPCORDVAL" AS "MPCORDVAL", 
      "REP"."ASLFCDBENDCAMP" AS "ASLFCDBENDCAMP", 
      "REP"."ASLFSTARTCAMP" AS "ASLFSTARTCAMP", 
      "REP"."ISDRCERT" AS "ISDRCERT", 
      "REP"."DRCERTSTARTCAMP" AS "DRCERTSTARTCAMP", 
      "REP"."DRCERTENDCAMP" AS "DRCERTENDCAMP", 
      "REP"."DRFOUSECAMP" AS "DRFOUSECAMP", 
      "REP"."MAIL_NO1" AS "MAIL_NO1", 
      "REP"."ADDRESS12" AS "ADDRESS12", 
      "REP"."ADDRESS22" AS "ADDRESS22", 
      "REP"."RECOMMENDERID" AS "RECOMMENDERID", 
      "REP"."RECOMMENDERNAME" AS "RECOMMENDERNAME", 
      "REP"."RECOMMENDERNATIONALID" AS "RECOMMENDERNATIONALID", 
      "REP"."COAPPLICANTNAME" AS "COAPPLICANTNAME", 
      "REP"."COMPANYNAME" AS "COMPANYNAME", 
      "REP"."ISEINVOICE" AS "ISEINVOICE", 
      "REP"."ISDONATE_INVOICE" AS "ISDONATE_INVOICE", 
      "REP"."DRM_CREATEDDATE" AS "DRM_CREATEDDATE"
      FROM "FOREST"."REP" "REP"</DefiningQuery>
          </EntitySet>

 

我再加入一個有主鍵的表進行對比，能夠看到有主鍵的表的定義以下。

<EntitySet Name="City" EntityType="Model.Store.City" store:Type="Tables" Schema="FOREST" />

咱們把沒有主鍵的<EntitySet>照着上面這個節點進行更改：刪除<DefiningQuery>節點，將store:Schema=」FOREST」更改成Schema=」FOREST」。這樣咱們就能夠對以前沒有設置主鍵的表進行更新、刪除以及插入操做了。

無主鍵的表SSDL定義其實更像是視圖，我有一點不明的是store:這個命名空間的做用是什麼，爲何只是刪除<DefiningQuery>不行，還須要將Schema屬性的store命名空間刪除才能夠。以上都是我還不明白的地方，只是做爲一個解決方案，它確實簡單可行。