{"id":8634,"date":"2022-08-02T14:49:18","date_gmt":"2022-08-02T06:49:18","guid":{"rendered":"https:\/\/www.hefeiyu.com\/?p=8634"},"modified":"2022-08-02T14:49:18","modified_gmt":"2022-08-02T06:49:18","slug":"oracle-%e5%ba%8f%e5%88%97%ef%bc%88sequence%e5%88%9b%e5%bb%ba%e4%b8%8e%e7%ae%a1%e7%90%86%e5%8f%8a%e5%ba%94%e7%94%a8","status":"publish","type":"post","link":"https:\/\/www.hefeiyu.com\/?p=8634","title":{"rendered":"Oracle \u5e8f\u5217\uff08Sequence)\u521b\u5efa\u4e0e\u7ba1\u7406\u53ca\u5e94\u7528"},"content":{"rendered":"

\u5728oracle\u4e2dsequence\u5c31\u662f\u5e8f\u53f7\uff0c\u6bcf\u6b21\u53d6\u7684\u65f6\u5019\u5b83\u4f1a\u81ea\u52a8\u589e\u52a0\u3002sequence\u4e0e\u8868\u6ca1\u6709\u5173\u7cfb<\/p>\n

1.create sequence<\/p>\n

\n
create sequence SEQ_PCBAProd_ID\r\nminvalue 1  --\u589e\u957f\u6700\u5c0f\u503c\r\nmaxvalue 65536  --\u589e\u957f\u6700\u5927\u503c,\u4e5f\u53ef\u4ee5\u8bbe\u7f6eNOMAXvalue -- \u4e0d\u8bbe\u7f6e\u6700\u5927\u503c\r\nstart with 1  --\u4ece101\u5f00\u59cb\u8ba1\u6570\r\nincrement by 1  --\u81ea\u589e\u6b65\u957f\u4e3a1\r\ncache 50  --\u8bbe\u7f6e\u7f13\u5b58cache\u4e2a\u5e8f\u5217\uff0c\u5982\u679c\u7cfb\u7edfdown\u6389\u4e86\u6216\u8005\u5176\u5b83\u60c5\u51b5\u5c06\u4f1a\u5bfc\u81f4\u5e8f\u5217\u4e0d\u8fde\u7eed\uff0c\u4e5f\u53ef\u4ee5\u8bbe\u7f6e\u4e3a---NOCACHE\u9632\u6b62\u8df3\u53f7\r\ncycle;  --\u5faa\u73af,\u5f53\u8fbe\u5230\u6700\u5927\u503c\u65f6,\u4e0d\u662f\u4ecestart with\u8bbe\u7f6e\u7684\u503c\u5f00\u59cb\u5faa\u73af\u3002\u800c\u662f\u4ece1\u5f00\u59cb\u5faa\u73af<\/pre>\n<\/div>\n
2.\u00a0\u4f7f\u7528\u5e8f\u5217\u7684\u503c<\/p>\n
\n
insert into \u8868\u540d(id,name)values(SEQ_PCBAProd_ID.Nextval,'sequence \u63d2\u5165\u6d4b\u8bd5');\r\nCurrVal\uff1a\u8fd4\u56de sequence\u7684\u5f53\u524d\u503c \r\nNextVal\uff1a\u589e\u52a0sequence\u7684\u503c\uff0c\u7136\u540e\u8fd4\u56de \u589e\u52a0\u540esequence\u503c<\/pre>\n<\/div>\n
\u6ce8\u610f\uff1a\u7b2c\u4e00\u6b21NEXTVAL\u8fd4\u56de\u7684\u662f\u521d\u59cb\u503c\uff1b\u968f\u540e\u7684NEXTVAL\u4f1a\u81ea\u52a8\u589e\u52a0\u4f60\u5b9a\u4e49\u7684INCREMENT BY\u503c\uff0c\u7136\u540e\u8fd4\u56de\u589e\u52a0\u540e\u7684\u503c\u3002<\/div>\n
CURRVAL \u603b\u662f\u8fd4\u56de\u5f53\u524dSEQUENCE\u7684\u503c\uff0c\u4f46\u662f\u5728\u7b2c\u4e00\u6b21NEXTVAL\u521d\u59cb\u5316\u4e4b\u540e\u624d\u80fd\u4f7f\u7528CURRVAL\uff0c\u5426\u5219\u4f1a\u51fa\u9519\u3002<\/p>\n
 <\/p>\n
\u4e00\u6b21NEXTVAL\u4f1a\u589e\u52a0\u4e00\u6b21 SEQUENCE\u7684\u503c\uff0c\u6240\u4ee5\u5982\u679c\u4f60\u5728\u540c\u4e00\u4e2a\u8bed\u53e5\u91cc\u9762\u4f7f\u7528\u591a\u4e2aNEXTVAL\uff0c\u5176\u503c\u5c31\u662f\u4e0d\u4e00\u6837\u7684\u3002
\n– \u5982\u679c\u6307\u5b9aCACHE\u503c\uff0cORACLE\u5c31\u53ef\u4ee5\u9884\u5148\u5728\u5185\u5b58\u91cc\u9762\u653e\u7f6e\u4e00\u4e9bsequence\uff0c\u8fd9\u6837\u5b58\u53d6\u7684\u5feb\u4e9b\u3002cache\u91cc\u9762\u7684\u53d6\u5b8c\u540e\uff0coracle\u81ea\u52a8\u518d\u53d6\u4e00\u7ec4 \u5230cache\u3002 \u4f7f\u7528cache\u6216\u8bb8\u4f1a\u8df3\u53f7\uff0c \u6bd4\u5982\u6570\u636e\u5e93\u7a81\u7136\u4e0d\u6b63\u5e38down\u6389\uff08shutdown abort),cache\u4e2d\u7684sequence\u5c31\u4f1a\u4e22\u5931. \u6240\u4ee5\u53ef\u4ee5\u5728create sequence\u7684\u65f6\u5019\u7528nocache\u9632\u6b62\u8fd9\u79cd\u60c5\u51b5<\/p>\n
 <\/p>\n
3.alter and drop sequence<\/p>\n
\u62e5\u6709ALTER ANY SEQUENCE \u6743\u9650\u624d\u80fd\u6539\u52a8sequence. \u53ef\u4ee5alter\u9664start\u81f3\u4ee5\u5916\u7684\u6240\u6709sequence\u53c2\u6570.\u5982\u679c\u60f3\u8981\u6539\u53d8start\u503c\uff0c\u5fc5\u987b drop sequence \u518d re-create\u3002alter\u00a0sequence SEQ_PCBAProd_ID maxvalue\u00a09999999;<\/p>\n
\n
alter sequence  <\/span>SEQ_PCBAProd_ID maxvalue 9999999;<\/span><\/span><\/span><\/pre>\n
\r\nDROP SEQUENCE SEQ_PCBAProd_ID;<\/em><\/pre>\n<\/div>\n
4.\u521b\u5efa\u89e6\u53d1\u5668trigger\u89e6\u53d1\u8c03\u7528sequence<\/p>\n
\n
--\u521b\u5efa\u5e8f\u5217\r\ncreate sequence SEQ_ID\r\nminvalue 1\r\nmaxvalue 99999999\r\nstart with 1\r\nincrement by 1\r\nnocache\r\norder;\r\n \r\n--\u5efa\u89e3\u53d1\u5668\u4ee3\u7801\u4e3a\uff1a\r\n \r\ncreate or replace trigger tri_test_id\r\n  before insert on S_Depart   --defore\u5728\u6dfb\u52a0\u65f6\u89e6\u53d1S_Depart \u662f\u8868\u540d\r\n  for each row  --\u884c\u7ea7\u89e6\u53d1\u5668\r\ndeclare\r\n  nextid number;\r\nbegin\r\n  IF :new.DepartId IS NULLor :new.DepartId=0 THEN --DepartId\u662f\u5217\u540d\r\n    select SEQ_ID.nextval --SEQ_ID\u6b63\u662f\u521a\u624d\u521b\u5efa\u7684\r\n    into nextid\r\n    from sys.dual;\r\n    :new.DepartId:=nextid;\r\n  end if;\r\nend tri_test_id;<\/pre>\n<\/div>\n
\u6ce8\uff1a:new \u4ee3\u8868 \u6570\u636e\u6539\u53d8\u540e\u7684\u65b0\u503c\uff0c\u76f8\u5bf9\u5e94\u7684\u6709 :old \u539f\u503c<\/p>\n
:= \u4ee3\u8868 \u8d4b<\/p>\n
:nextid\u8868\u793a\u5f15\u7528sqlplus\u4e2d\u5b9a\u4e49\u7684\u53d8\u91cf<\/p>\n
\u4ee5\u4e0b\u662fC#\u4ee3\u7801 \u4f7f\u7528Sequence<\/p>\n
\n
 var result = new SNResult() { ErrorCode = -1, Message = \"\u64cd\u4f5c\u51fa\u9519\uff01\", SN = \"-1\" };\r\n            try\r\n            {\r\n                \/\/string strConn = OraHelper.GetDbConnString(\"ConnString\");\r\n                string Sql = \"Select SEQ_PCBAProd_ID.NEXTVAL Total from dual \";\r\n                TotalDto temp=OraHelper.QuerySingle<TotalDto>(Sql);\r\n                result.ErrorCode = 0;\r\n                result.Message = \"\u64cd\u4f5c\u6210\u529f\uff01\";\r\n                result.SN = temp.Total.ToString();\r\n            }\r\n            catch (Exception ex)\r\n            {\r\n                result.Message += ex.Message;\r\n                result.SN = \"-1\";\r\n            }<\/pre>\n<\/div>\n
\u8f6c\u8f7d\u8bf7\u6ce8\u660e\uff1a\u8d6b\u975e\u57df<\/a> » Oracle \u5e8f\u5217\uff08Sequence)\u521b\u5efa\u4e0e\u7ba1\u7406\u53ca\u5e94\u7528<\/a><\/p>","protected":false},"excerpt":{"rendered":"
\u5728oracle\u4e2dsequence\u5c31\u662f\u5e8f\u53f7\uff0c\u6bcf\u6b21\u53d6\u7684\u65f6\u5019\u5b83\u4f1a\u81ea\u52a8\u589e\u52a0\u3002sequence\u4e0e\u8868\u6ca1\u6709\u5173\u7cfb 1.create sequence create sequence SEQ_PCBAProd_ID minvalue 1 –\u589e\u957f\u6700\u5c0f\u503c maxvalu […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2,28],"tags":[1071,1072,832],"class_list":["post-8634","post","type-post","status-publish","format-standard","hentry","category-tiptop-erp","category-unix","tag-sequence","tag-1072","tag-832"],"_links":{"self":[{"href":"https:\/\/www.hefeiyu.com\/index.php?rest_route=\/wp\/v2\/posts\/8634","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.hefeiyu.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.hefeiyu.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.hefeiyu.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.hefeiyu.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=8634"}],"version-history":[{"count":1,"href":"https:\/\/www.hefeiyu.com\/index.php?rest_route=\/wp\/v2\/posts\/8634\/revisions"}],"predecessor-version":[{"id":8635,"href":"https:\/\/www.hefeiyu.com\/index.php?rest_route=\/wp\/v2\/posts\/8634\/revisions\/8635"}],"wp:attachment":[{"href":"https:\/\/www.hefeiyu.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=8634"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.hefeiyu.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=8634"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.hefeiyu.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=8634"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}