{"id":225,"date":"2011-02-02T10:49:34","date_gmt":"2011-02-02T02:49:34","guid":{"rendered":"http:\/\/www.royalwzy.com\/?p=225"},"modified":"2013-12-30T13:57:06","modified_gmt":"2013-12-30T05:57:06","slug":"scope_identity-%e5%87%bd%e6%95%b0%e4%bd%bf%e7%94%a8","status":"publish","type":"post","link":"http:\/\/www.royalwzy.com\/?p=225","title":{"rendered":"SCOPE_IDENTITY \u51fd\u6570\u4f7f\u7528"},"content":{"rendered":"

\u8fd4\u56de\u63d2\u5165\u5230\u540c\u4e00\u4f5c\u7528\u57df\u4e2d\u7684\u6807\u8bc6\u5217\u5185\u7684\u6700\u540e\u4e00\u4e2a\u6807\u8bc6\u503c<\/span>.<\/span>\u4e00\u4e2a\u8303\u56f4\u662f\u4e00\u4e2a\u6a21\u5757\uff1a\u5b58\u50a8\u8fc7\u7a0b\u3001\u89e6\u53d1\u5668\u3001\u51fd\u6570\u6216\u6279\u5904\u7406<\/span>.<\/span>\u56e0\u6b64<\/span>,<\/span>\u5982\u679c\u4e24\u4e2a\u8bed\u53e5\u5904\u4e8e\u540c\u4e00\u4e2a\u5b58\u50a8\u8fc7\u7a0b\u3001\u51fd\u6570\u6216\u6279\u5904\u7406\u4e2d<\/span>,<\/span>\u5219\u5b83\u4eec\u4f4d\u4e8e\u76f8\u540c\u7684\u4f5c\u7528\u57df\u4e2d<\/span>.<\/span><\/span><\/span><\/p>\n

\u8bed\u6cd5\uff1a<\/span>SCOPE_IDENTITY()<\/span><\/span><\/span><\/p>\n

\u8fd4\u56de\u7c7b\u578b\uff1a<\/span>numeric(38,0)<\/span><\/span><\/span><\/p>\n


\n<\/span>SCOPE_IDENTITY<\/span>\u3001<\/span>IDENT_CURRENT\u00a0<\/span>\u548c<\/span>\u00a0@@IDENTITY\u00a0<\/span>\u662f\u76f8\u4f3c\u7684\u51fd\u6570<\/span>,<\/span>\u56e0\u4e3a\u5b83\u4eec\u90fd\u8fd4\u56de\u63d2\u5165\u5230\u6807\u8bc6\u5217\u4e2d\u7684\u503c<\/span>.<\/span><\/span><\/span><\/p>\n

IDENT_CURRENT\u00a0<\/span>\u4e0d\u53d7\u4f5c\u7528\u57df\u548c\u4f1a\u8bdd\u7684\u9650\u5236<\/span>,<\/span>\u800c\u53d7\u9650\u4e8e\u6307\u5b9a\u7684\u8868<\/span>.IDENT_CURRENT\u00a0<\/span>\u8fd4\u56de\u4e3a\u4efb\u4f55\u4f1a\u8bdd\u548c\u4f5c\u7528\u57df\u4e2d\u7684\u7279\u5b9a\u8868\u6240\u751f\u6210\u7684\u503c<\/span>.<\/span><\/span><\/span><\/p>\n

SCOPE_IDENTITY\u00a0<\/span>\u548c<\/span>\u00a0@@IDENTITY\u00a0<\/span>\u8fd4\u56de\u5728\u5f53\u524d\u4f1a\u8bdd\u4e2d\u7684\u4efb\u4f55\u8868\u5185\u6240\u751f\u6210\u7684\u6700\u540e\u4e00\u4e2a\u6807\u8bc6\u503c<\/span>.<\/span>\u4f46\u662f<\/span>,SCOPE_IDENTITY\u00a0<\/span>\u53ea\u8fd4\u56de\u63d2\u5165\u5230\u5f53\u524d\u4f5c\u7528\u57df\u4e2d\u7684\u503c\uff1b<\/span>@@IDENTITY\u00a0<\/span>\u4e0d\u53d7\u9650\u4e8e\u7279\u5b9a\u7684\u4f5c\u7528\u57df<\/span>.<\/span><\/span><\/span><\/p>\n

\u4f8b\u5982<\/span>,<\/span>\u6709\u4e24\u4e2a\u8868<\/span>\u00a0T1\u00a0<\/span>\u548c<\/span>\u00a0T2,<\/span>\u5e76\u4e14\u5728<\/span>\u00a0T1\u00a0<\/span>\u4e0a\u5b9a\u4e49\u4e86<\/span>\u00a0INSERT\u00a0<\/span>\u89e6\u53d1\u5668<\/span>.<\/span>\u5f53\u5c06\u67d0\u884c\u63d2\u5165<\/span>\u00a0T1\u00a0<\/span>\u65f6<\/span>,<\/span>\u89e6\u53d1\u5668\u88ab\u6fc0\u53d1<\/span>,<\/span>\u5e76\u5728<\/span>\u00a0T2\u00a0<\/span>\u4e2d\u63d2\u5165\u4e00\u884c<\/span>.<\/span>\u8be5\u65b9\u6848\u6f14\u793a\u4e86\u4e24\u4e2a\u4f5c\u7528\u57df\uff1a\u5728<\/span>\u00a0T1\u00a0<\/span>\u4e0a\u7684\u63d2\u5165<\/span>,<\/span>\u4ee5\u53ca\u5728<\/span>\u00a0T2\u00a0<\/span>\u901a\u8fc7\u89e6\u53d1\u5668\u7684\u63d2\u5165<\/span>.<\/span><\/span><\/span><\/p>\n

\u5047\u8bbe<\/span>\u00a0T1\u00a0<\/span>\u548c<\/span>\u00a0T2\u00a0<\/span>\u90fd\u6709\u6807\u8bc6\u5217<\/span>,@@IDENTITY\u00a0<\/span>\u548c<\/span>\u00a0SCOPE_IDENTITY\u00a0<\/span>\u5c06\u5728<\/span>\u00a0T1\u00a0<\/span>\u4e0a\u7684<\/span>\u00a0INSERT\u00a0<\/span>\u8bed\u53e5\u7684\u6700\u540e\u8fd4\u56de\u4e0d\u540c\u7684\u503c<\/span>.@@IDENTITY\u00a0<\/span>\u5c06\u8fd4\u56de\u5728\u5f53\u524d\u4f1a\u8bdd\u4e2d\u7684\u4efb\u4f55\u4f5c\u7528\u57df\u5185\u63d2\u5165\u7684\u6700\u540e\u4e00\u4e2a\u6807\u8bc6\u5217\u7684\u503c<\/span>.<\/span>\u8fd9\u662f\u5728<\/span>\u00a0T2\u00a0<\/span>\u4e2d\u63d2\u5165\u7684\u503c<\/span>.SCOPE_IDENTITY()\u00a0<\/span>\u5c06\u8fd4\u56de\u5728<\/span>\u00a0T1\u00a0<\/span>\u4e2d\u63d2\u5165\u7684<\/span>\u00a0IDENTITY\u00a0<\/span>\u503c<\/span>.<\/span>\u8fd9\u662f\u5728\u540c\u4e00\u4e2a\u4f5c\u7528\u57df\u5185\u53d1\u751f\u7684\u6700\u540e\u7684\u63d2\u5165<\/span>.<\/span>\u5982\u679c\u5728\u4efb\u4f55<\/span>\u00a0INSERT\u00a0<\/span>\u8bed\u53e5\u4f5c\u7528\u4e8e\u4f5c\u7528\u57df\u4e2d\u7684\u6807\u8bc6\u5217\u4e4b\u524d\u8c03\u7528<\/span>\u00a0SCOPE_IDENTITY()\u00a0<\/span>\u51fd\u6570<\/span>,<\/span>\u5219\u8be5\u51fd\u6570\u5c06\u8fd4\u56de<\/span>\u00a0Null.<\/span><\/span><\/span><\/p>\n

\u5982\u679c\u8bed\u53e5\u548c\u4e8b\u52a1\u5931\u8d25<\/span>,<\/span>\u5b83\u4eec\u4f1a\u66f4\u6539\u8868\u7684\u5f53\u524d\u6807\u8bc6<\/span>,<\/span>\u4ece\u800c\u4f7f\u6807\u8bc6\u5217\u4e2d\u7684\u503c\u51fa\u73b0\u4e0d\u8fde\u8d2f\u73b0\u8c61<\/span>.<\/span>\u5373\u4f7f\u672a\u63d0\u4ea4\u8bd5\u56fe\u5411\u8868\u4e2d\u63d2\u5165\u503c\u7684\u4e8b\u52a1<\/span>,<\/span>\u4e5f\u6c38\u8fdc\u65e0\u6cd5\u56de\u6eda\u6807\u8bc6\u503c<\/span>.<\/span>\u4f8b\u5982<\/span>,<\/span>\u5982\u679c\u56e0<\/span>\u00a0IGNORE_DUP_KEY\u00a0<\/span>\u51b2\u7a81\u800c\u5bfc\u81f4<\/span>\u00a0INSERT\u00a0<\/span>\u8bed\u53e5\u5931\u8d25<\/span>,<\/span>\u8868\u7684\u5f53\u524d\u6807\u8bc6\u503c\u4ecd\u7136\u4f1a\u589e\u52a0<\/span>.<\/span><\/span><\/span><\/p>\n

\u00a0<\/span><\/span><\/p>\n

\u793a\u4f8b<\/span><\/span><\/p>\n

A.\u00a0<\/span>\u5c06<\/span>\u00a0@@IDENTITY\u00a0<\/span>\u548c<\/span>\u00a0SCOPE_IDENTITY\u00a0<\/span>\u7528\u4e8e\u89e6\u53d1\u5668<\/span><\/span><\/span><\/p>\n

\u4e0b\u9762\u7684\u793a\u4f8b\u521b\u5efa\u4e24\u4e2a\u8868<\/span>,TZ\u00a0<\/span>\u548c<\/span>\u00a0<\/span>TY,<\/span>\u5e76\u5bf9<\/span>\u00a0<\/span>TZ\u00a0<\/span>\u521b\u5efa\u4e00\u4e2a<\/span>\u00a0INSERT\u00a0<\/span>\u89e6\u53d1\u5668<\/span>.<\/span>\u5f53\u5c06\u67d0\u884c\u63d2\u5165\u8868<\/span>\u00a0<\/span>TZ\u00a0<\/span>\u4e2d\u65f6<\/span>,<\/span>\u89e6\u53d1\u5668<\/span>\u00a0(Ztrig)<\/span>\u5c06\u6fc0\u53d1\u5e76\u5728<\/span>\u00a0<\/span>TY\u00a0<\/span>\u4e2d\u63d2\u5165\u4e00\u884c<\/span>.<\/span><\/span><\/span><\/p>\n

USE tempdb<\/span><\/span><\/p>\n

GO<\/span><\/span><\/p>\n

CREATE TABLE TZ (<\/span><\/span><\/p>\n

Z_id int IDENTITY(1,1)PRIMARY KEY,<\/span><\/span><\/p>\n

Z_name varchar(20) NOT NULL)<\/span><\/span><\/p>\n

\u00a0<\/span><\/span><\/p>\n

INSERT TZ<\/span><\/span><\/p>\n

VALUES (‘Lisa’)<\/span><\/span><\/p>\n

INSERT TZ<\/span><\/span><\/p>\n

VALUES (‘Mike’)<\/span><\/span><\/p>\n

INSERT TZ<\/span><\/span><\/p>\n

VALUES (‘Carla’)<\/span><\/span><\/p>\n

\u00a0<\/span><\/span><\/p>\n

SELECT * FROM TZ<\/span><\/span><\/p>\n

\u00a0<\/span><\/span><\/p>\n

–Result set: This is how table TZ looks.<\/span><\/span><\/p>\n

\u00a0<\/span><\/span><\/p>\n

Z_id Z_name<\/span><\/span><\/p>\n

————-<\/span><\/span><\/p>\n

1 Lisa<\/span><\/span><\/p>\n

2 Mike<\/span><\/span><\/p>\n

3 Carla<\/span><\/span><\/p>\n

\u00a0<\/span><\/span><\/p>\n

CREATE TABLE TY (<\/span><\/span><\/p>\n

Y_id int IDENTITY(100,5)PRIMARY KEY,<\/span><\/span><\/p>\n

Y_name varchar(20) NULL)<\/span><\/span><\/p>\n

\u00a0<\/span><\/span><\/p>\n

INSERT TY (Y_name)<\/span><\/span><\/p>\n

VALUES (‘boathouse’)<\/span><\/span><\/p>\n

INSERT TY (Y_name)<\/span><\/span><\/p>\n

VALUES (‘rocks’)<\/span><\/span><\/p>\n

INSERT TY (Y_name)<\/span><\/span><\/p>\n

VALUES (‘elevator’)<\/span><\/span><\/p>\n

\u00a0<\/span><\/span><\/p>\n

SELECT * FROM TY<\/span><\/span><\/p>\n

–Result set: This is how TY looks:<\/span><\/span><\/p>\n

\u00a0<\/span><\/span><\/p>\n

Y_id Y_name<\/span><\/span><\/p>\n

—————<\/span><\/span><\/p>\n

100 boathouse<\/span><\/span><\/p>\n

105 rocks<\/span><\/span><\/p>\n

110 elevator<\/span><\/span><\/p>\n

\u00a0<\/span><\/span><\/p>\n

\/*Create the trigger that inserts a row in table TY<\/span><\/span><\/p>\n

when a row is inserted in table TZ.*\/<\/span><\/span><\/p>\n

CREATE TRIGGER Ztrig<\/span><\/span><\/p>\n

ON TZ<\/span><\/span><\/p>\n

FOR INSERT AS<\/span><\/span><\/p>\n

BEGIN<\/span><\/span><\/p>\n

INSERT TY VALUES (”)<\/span><\/span><\/p>\n

END<\/span><\/span><\/p>\n

\u00a0<\/span><\/span><\/p>\n

\/*FIRE the trigger and determine what identity values you obtain<\/span><\/span><\/p>\n

with the @@IDENTITY and SCOPE_IDENTITY functions.*\/<\/span><\/span><\/p>\n

INSERT TZ VALUES (‘Rosalie’)<\/span><\/span><\/p>\n

\u00a0<\/span><\/span><\/p>\n

SELECT SCOPE_IDENTITY() AS [SCOPE_IDENTITY]<\/span><\/span><\/p>\n

GO<\/span><\/span><\/p>\n

SELECT @@IDENTITY AS [@@IDENTITY]<\/span><\/span><\/p>\n

GO<\/span><\/span><\/p>\n

\u00a0<\/span><\/span><\/p>\n

\u4e0b\u9762\u662f\u7ed3\u679c\u96c6\uff1a<\/span><\/span><\/p>\n

SCOPE_IDENTITY<\/span><\/span><\/p>\n

4<\/span><\/span><\/p>\n

\/*SCOPE_IDENTITY\u00a0<\/span>\u8fd4\u56de\u540c\u4e00\u4e2a\u4f5c\u7528\u57df\u4e2d\u7684\u6700\u540e\u4e00\u4e2a\u6807\u8bc6\u503c<\/span>.<\/span>\u8fd9\u5bf9\u4e8e\u8868<\/span>\u00a0TZ\u00a0<\/span>\u662f\u63d2\u5165\u64cd\u4f5c<\/span>.*\/<\/span><\/span><\/span><\/p>\n

@@IDENTITY<\/span><\/span><\/p>\n

115<\/span><\/span><\/p>\n

\/*@@IDENTITY\u00a0<\/span>\u8fd4\u56de\u7531\u89e6\u53d1\u5668\u63d2\u5165\u5230<\/span>\u00a0TY\u00a0<\/span>\u7684\u6700\u540e\u4e00\u4e2a\u6807\u8bc6\u503c<\/span>.<\/span>\u4e4b\u6240\u4ee5\u6fc0\u53d1<\/span>,<\/span>\u662f\u56e0\u4e3a\u4ee5\u524d\u5bf9<\/span>\u00a0TZ\u00a0<\/span>\u6267\u884c\u4e86\u63d2\u5165<\/span>.*\/<\/span><\/span><\/span><\/p>\n

B.\u00a0<\/span>\u5c06<\/span>\u00a0@@IDENTITY\u00a0<\/span>\u548c<\/span>\u00a0SCOPE_IDENTITY()\u00a0<\/span>\u7528\u4e8e\u590d\u5236<\/span><\/span><\/span><\/p>\n

\u4e0b\u9762\u7684\u793a\u4f8b\u8bf4\u660e\u5982\u4f55\u9488\u5bf9\u4e3a\u5408\u5e76\u590d\u5236\u53d1\u5e03\u7684\u6570\u636e\u5e93\u4e2d\u7684\u63d2\u5165\u5185\u5bb9\u4f7f\u7528<\/span>\u00a0<\/span>@@IDENTITY\u00a0<\/span>\u548c<\/span>\u00a0<\/span>SCOPE_IDENTITY().<\/span>\u793a\u4f8b\u4e2d\u7684\u4e24\u4e2a\u8868\u90fd\u5728<\/span>\u00a0<\/span>AdventureWorks2008R2<\/span>\u00a0<\/span>\u793a\u4f8b\u6570\u636e\u5e93\u4e2d<\/span>,<\/span>\u5176\u4e2d<\/span>\u00a0<\/span>Person.ContactType\u00a0<\/span>\u672a\u53d1\u5e03<\/span>,Sales.Customer<\/span>\u5df2\u53d1\u5e03<\/span>.<\/span>\u5408\u5e76\u590d\u5236\u5c06\u628a\u89e6\u53d1\u5668\u6dfb\u52a0\u5230\u5df2\u53d1\u5e03\u7684\u8868\u4e2d<\/span>.<\/span>\u56e0\u6b64<\/span>,@@IDENTITY\u00a0<\/span>\u53ef\u4ee5\u4ece\u590d\u5236\u7cfb\u7edf\u8868\u4e2d\u7684\u63d2\u5165\u5185\u5bb9\u800c\u975e\u7528\u6237\u8868\u4e2d\u7684\u63d2\u5165\u5185\u5bb9\u8fd4\u56de\u503c<\/span>.<\/span><\/span><\/span><\/p>\n

Person.ContactType\u00a0<\/span>\u8868\u7684\u6700\u5927\u6807\u8bc6\u503c\u4e3a<\/span>\u00a020.<\/span>\u5982\u679c\u5728\u8be5\u8868\u4e2d\u63d2\u5165\u4e00\u884c<\/span>,@@IDENTITY\u00a0<\/span>\u548c<\/span>\u00a0<\/span>SCOPE_IDENTITY()\u00a0<\/span>\u5c06\u8fd4\u56de\u76f8\u540c\u7684\u503c<\/span>.<\/span><\/span><\/span><\/p>\n

USE AdventureWorks2008R2;<\/span><\/span><\/p>\n

GO<\/span><\/span><\/p>\n

INSERT INTO Person.ContactType ([Name]) VALUES (‘Assistant to the Manager’);<\/span><\/span><\/p>\n

GO<\/span><\/span><\/p>\n

SELECT SCOPE_IDENTITY() AS [SCOPE_IDENTITY];<\/span><\/span><\/p>\n

GO<\/span><\/span><\/p>\n

SELECT @@IDENTITY AS [@@IDENTITY];<\/span><\/span><\/p>\n

GO<\/span><\/span><\/p>\n

\u00a0<\/span><\/span><\/p>\n

\u4e0b\u9762\u662f\u7ed3\u679c\u96c6\uff1a<\/span><\/span><\/p>\n

SCOPE_IDENTITY<\/span><\/span><\/p>\n

21<\/span><\/span><\/p>\n

@@IDENTITY<\/span><\/span><\/p>\n

21<\/span><\/span><\/p>\n

Sales.Customer\u00a0<\/span>\u8868\u7684\u6700\u5927\u6807\u8bc6\u503c\u4e3a<\/span>\u00a029483.<\/span>\u5982\u679c\u5728\u6b64\u8868\u4e2d\u63d2\u5165\u4e00\u884c<\/span>,@@IDENTITY\u00a0<\/span>\u548c<\/span>\u00a0<\/span>SCOPE_IDENTITY()\u00a0<\/span>\u5c06\u8fd4\u56de\u4e0d\u540c\u503c<\/span>.SCOPE_IDENTITY()\u00a0<\/span>\u4ece\u7528\u6237\u8868\u7684\u63d2\u5165\u5185\u5bb9\u8fd4\u56de\u503c<\/span>,<\/span>\u800c<\/span>\u00a0<\/span>@@IDENTITY\u00a0<\/span>\u4ece\u590d\u5236\u7cfb\u7edf\u8868\u4e2d\u7684\u63d2\u5165\u5185\u5bb9\u8fd4\u56de\u503c<\/span>.<\/span>\u8bf7\u5bf9\u9700\u8981\u8bbf\u95ee\u63d2\u5165\u7684\u6807\u8bc6\u503c\u7684\u5e94\u7528\u7a0b\u5e8f\u4f7f\u7528<\/span>\u00a0<\/span>SCOPE_IDENTITY().<\/span><\/span><\/span><\/p>\n

INSERT INTO Sales.Customer ([TerritoryID],[PersonID]) VALUES (8,NULL);<\/span><\/span><\/p>\n

GO<\/span><\/span><\/p>\n

SELECT SCOPE_IDENTITY() AS [SCOPE_IDENTITY];<\/span><\/span><\/p>\n

GO<\/span><\/span><\/p>\n

SELECT @@IDENTITY AS [@@IDENTITY];<\/span><\/span><\/p>\n

GO<\/span><\/span><\/p>\n

\u00a0<\/span><\/span><\/p>\n

\u4e0b\u9762\u662f\u7ed3\u679c\u96c6\uff1a<\/span><\/span><\/p>\n

SCOPE_IDENTITY<\/span><\/span><\/p>\n

29484<\/span><\/span><\/p>\n

@@IDENTITY<\/span><\/span><\/p>\n

89<\/span><\/span><\/p>\n","protected":false},"excerpt":{"rendered":"

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