{"id":671,"date":"2012-03-19T23:55:57","date_gmt":"2012-03-19T15:55:57","guid":{"rendered":"https:\/\/yangtingkun.net\/?p=671"},"modified":"2012-03-22T15:12:55","modified_gmt":"2012-03-22T07:12:55","slug":"%e5%bf%ab%e9%80%9f%e5%a2%9e%e5%8a%a0%e8%a1%a8%e7%9a%84%e9%bb%98%e8%ae%a4%e5%80%bc%e7%9a%84%e6%96%b9%e6%b3%95","status":"publish","type":"post","link":"https:\/\/yangtingkun.net\/?p=671","title":{"rendered":"\u5feb\u901f\u589e\u52a0\u8868\u7684\u9ed8\u8ba4\u503c\u7684\u65b9\u6cd5"},"content":{"rendered":"<p>\u770b\u5230ITPUB\u4e0a\u6709\u4eba\u63d0\u5230\uff0c\u5982\u4f55\u5feb\u901f\u7684\u5728\u4e00\u4e2a3\u4ebf\u6761\u8bb0\u5f55\u7684\u8868\u4e2d\u589e\u52a0\u4e00\u4e2a\u5305\u542bDEFAULT\u503c\u7684\u65b0\u5b57\u6bb5\u3002\u63cf\u8ff0\u4e00\u4e0b\u5982\u4f55\u5feb\u901f\u7684\u6dfb\u52a0\u8868\u7684\u9ed8\u8ba4\u503c\u3002<br \/>\nOracle11\u65b0\u7279\u6027\u2014\u2014\u5728\u7ebf\u64cd\u4f5c\u529f\u80fd\u589e\u5f3a\uff08\u4e8c\uff09 \uff1a<a href=\"http:\/\/yangtingkun.itpub.net\/post\/468\/401293\">http:\/\/yangtingkun.itpub.net\/post\/468\/401293<\/a><br \/>\n\u5bf9\u4e8e\u8fd9\u4e2a\u95ee\u9898\uff0c\u5e38\u89c4\u7684\u65b9\u6cd5\u6709\u4e09\u4e2a\uff1a<br \/>\n\u4e00\u3001\u76f4\u63a5ALTER TABLE ADD COLUMN\uff0c\u8fd9\u79cd\u65b9\u6cd5\u7684\u597d\u5904\u662f\u7b80\u5355\uff0c\u4e00\u4e2a\u547d\u4ee4\u5c31\u53ef\u4ee5\u5b8c\u6210\uff0c\u7f3a\u70b9\u662f\u8017\u65f6\u975e\u5e38\u957f\uff0c\u800c\u4e14\u5728\u6f2b\u957f\u7684\u6267\u884c\u8fc7\u957f\u4e2d\u90fd\u4f1a\u9501\u5b9a\u8868\uff0c\u5bfc\u81f4\u5e94\u7528\u65e0\u6cd5\u4fee\u6539\u6570\u636e\uff0c\u5e76\u4e14\u5728\u5b8c\u6210\u540e\u5bb9\u6613\u9020\u6210\u5927\u91cf\u7684\u884c\u8fc1\u79fb\uff0c\u4ece\u800c\u5f71\u54cd\u540e\u7eed\u8bbf\u95ee\u7684\u6027\u80fd\uff1b<br \/>\n\u4e8c\u3001CREATE TABLE AS SELECT\u7684\u65b9\u5f0f\uff0c\u8fd9\u79cd\u65b9\u5f0f\u76f8\u5bf9\u7b2c\u4e00\u79cd\u800c\u8a00\uff0c\u6548\u7387\u66f4\u9ad8\uff0c\u5982\u679c\u662f\u975e\u5f52\u6863\u6a21\u5f0f\uff0c\u90a3\u4e48\u5b8c\u6210\u901f\u5ea6\u4f1a\u66f4\u5feb\u3002\u4f46\u662f\u7f3a\u70b9\u540c\u6837\u5f88\u660e\u663e\uff0c\u9996\u5148\u9700\u8981\u5927\u91cf\u7684\u505c\u673a\u65f6\u95f4\uff0c\u800c\u4e14\u8868\u4e0a\u7684\u7d22\u5f15\u3001\u7ea6\u675f\u3001\u89e6\u53d1\u5668\u4ee5\u53ca\u6743\u9650\u7b49\u90fd\u9700\u8981\u624b\u5de5\u5904\u7406\uff0c\u6bd4\u8f83\u9ebb\u70e6\uff1b<br \/>\n\u4e09\u3001\u5728\u7ebf\u91cd\u5b9a\u4e49\uff0c\u8fd9\u79cd\u65b9\u5f0f\u5e94\u8be5\u7b97\u662f\u8fd9\u4e09\u79cd\u4e2d\u6700\u4f73\u7684\uff0c\u9501\u8868\u65f6\u95f4\u975e\u5e38\u77ed\uff0c\u5bf9\u4e1a\u52a1\u5f71\u54cd\u6700\u5c0f\uff0c\u4f46\u662f\u7f3a\u70b9\u662f\u6574\u4e2a\u64cd\u4f5c\u7684\u65f6\u95f4\u5e76\u4e0d\u4f1a\u53d8\u77ed\uff0c\u548c\u7b2c\u4e8c\u79cd\u65b9\u5f0f\u4e00\u6837\uff0c\u90fd\u9700\u89812\u500d\u7684\u5b58\u50a8\u7a7a\u95f4\uff0c\u800c\u4e14\u64cd\u4f5c\u76f8\u5bf9\u590d\u6742\u3002<br \/>\n\u5982\u679c\u6570\u636e\u5e93\u7684\u7248\u672c\u662f11g\uff0c\u90a3\u4e48\u8fd9\u5c31\u4e0d\u662f\u95ee\u9898\u4e86\uff0c\u4ee5\u524d\u5199\u8fc7\u4e13\u95e8\u7684\u6587\u7ae0\uff0c\u63cf\u8ff011g\u662f\u5982\u4f55\u5feb\u901f\u6dfb\u52a0\u4e00\u4e2a\u5305\u542b\u975e\u7a7aDEFAULT\u503c\u7684\u5217\u7684\u3002\u90a3\u4e48\u5bf9\u4e8e10g\u53ca\u4ee5\u524d\u7248\u672c\u7684\u6570\u636e\u5e93\u800c\u8a00\uff0c\u589e\u52a0\u4e00\u4e2a\u5305\u542b\u9ed8\u8ba4\u503c\u7684\u5b57\u6bb5\u96be\u9053\u5c31\u771f\u7684\u8981\u5fcd\u53d7\u6f2b\u957f\u7684\u6267\u884c\u65f6\u95f4\u548c\u5927\u91cf\u7684REDO\u3001UNDO\u7684\u5360\u7528\u5417\u3002<br \/>\n\u5176\u5b9e\u5b8c\u5168\u53ef\u4ee5\u4eff\u716711g\u7684\u65b9\u5f0f\uff0c\u6765\u81ea\u5df1\u5b9e\u73b010g\u4e2d\u5b57\u6bb5\u7684\u5feb\u901f\u6dfb\u52a0\u3002\u8bb0\u5f97Tom\u5728\u63cf\u8ff0\u6570\u636e\u5e93\u7684\u89e3\u6790\u65f6\u63d0\u5230\u8fc7\uff0c\u8f6f\u89e3\u6790\u8981\u4f18\u4e8e\u786c\u89e3\u6790\uff0c\u8f6f\u8f6f\u89e3\u6790\u8981\u4f18\u4e8e\u8f6f\u89e3\u6790\uff0c\u800c\u901f\u5ea6\u6700\u5feb\u7684\u83ab\u8fc7\u4e8e\u4e0d\u89e3\u6790\u3002\u63d0\u9ad8\u901f\u5ea6\u7684\u6700\u9ad8\u5883\u754c\u5c31\u662f\u6839\u672c\u4e0d\u505a\u3002<br \/>\n\u90a3\u4e48\u5bf9\u4e8e\u6dfb\u52a0\u9ed8\u8ba4\u503c\u7684\u65b9\u5f0f\u4e5f\u53ef\u4ee5\u624d\u6709\u8fd9\u79cd\u65b9\u6cd5\uff0c\u5bf9\u4e8e\u5df2\u7ecf\u5b58\u5728\u7684\u8bb0\u5f55\u7684\u9ed8\u8ba4\u503c\uff0c\u6211\u4eec\u6839\u672c\u4e0d\u53bb\u6dfb\u52a0\uff0c\u4e00\u4e2a\u7b80\u5355\u7684\u4f8b\u5b50\u5982\u4e0b\uff1a<\/p>\n<pre lang='SQL'>SQL> CREATE TABLE T_ADD_COLUMN (ID NUMBER, NAME VARCHAR2(30));\r\nTable created.\r\nSQL> INSERT INTO T_ADD_COLUMN   \r\n  2  SELECT ROWNUM, OBJECT_NAME\r\n  3  FROM DBA_OBJECTS;\r\n11955 rows created.\r\nSQL> COMMIT;\r\nCommit complete.\r\nSQL> ALTER TABLE T_ADD_COLUMN ADD (NEW_COL VARCHAR2(30));\r\nTable altered.\r\nSQL> ALTER TABLE T_ADD_COLUMN MODIFY (NEW_COL DEFAULT 'OLD VALUE');\r\nTable altered.\r\nSQL> SELECT * FROM T_ADD_COLUMN WHERE ID = 1;\r\n        ID NAME                           NEW_COL\r\n---------- ------------------------------ ------------------------------\r\n         1 ICOL$\r\nSQL> ALTER TABLE T_ADD_COLUMN RENAME TO T_ADD_COLUMN_BASE;\r\nTable altered.\r\nSQL> CREATE VIEW T_ADD_COLUMN\r\n  2  (ID, NAME, NEW_COL) \r\n  3  AS SELECT ID, NAME, NVL(NEW_COL, 'OLD VALUE')\r\n  4  FROM T_ADD_COLUMN_BASE;\r\nView created.\r\nSQL> SELECT * FROM T_ADD_COLUMN WHERE ID = 1;\r\n        ID NAME                           NEW_COL\r\n---------- ------------------------------ ------------------------------\r\n         1 ICOL$                          OLD VALUE<\/pre>\n<p>\u5c06\u6dfb\u52a0\u5217\u548c\u589e\u52a0\u9ed8\u8ba4\u503c\u7684DDL\u5206\u5f00\u6267\u884c\uff0c\u8fd9\u6837Oracle\u4e0d\u4f1a\u5728\u6dfb\u52a0\u5217\u7684\u540c\u65f6\u7ed9\u73b0\u6709\u7684\u8bb0\u5f55\u589e\u52a0\u9ed8\u8ba4\u503c\uff0c\u56e0\u6b64\u8fd9\u4e24\u4e2aSQL\u90fd\u662f\u79d2\u7ea7\u5b8c\u6210\u3002\u968f\u540e\u5c06\u8868\u91cd\u547d\u540d\uff0c\u7136\u540e\u6839\u636e\u539f\u59cb\u7684\u540d\u79f0\u521b\u5efa\u4e00\u4e2a\u89c6\u56fe\uff0c\u5728\u8bfb\u53d6\u8868\u7684\u65f6\u5019\uff0c\u5c06\u65b0\u589e\u5217\u6240\u6709\u7684\u7a7a\u503c\u90fd\u8f6c\u5316\u4e3a\u9ed8\u8ba4\u503c\u5373\u53ef\u3002\u6574\u4e2a\u8fc7\u7a0b\u53ea\u9700\u89814\u4e2aDDL\uff0c\u4e14\u90fd\u662f\u79d2\u7ea7\u5b8c\u6210\uff0c\u8fd9\u6837\u5c31\u5b9e\u73b0\u4e86\u7ed9\u8868\u589e\u52a0\u9ed8\u8ba4\u503c\u7684\u9700\u6c42\u3002<br \/>\n\u5f53\u7136\u8868\u548c\u89c6\u56fe\u8fd8\u662f\u6709\u5f88\u5927\u533a\u522b\u7684\uff0c\u6bd4\u5982\u7531\u4e8e\u4f7f\u7528\u4e86\u51fd\u6570\u4f5c\u4e3a\u67e5\u8be2\u5217\uff0c\u4f7f\u5f97\u8fd9\u4e2a\u89c6\u56fe\u4e0d\u652f\u6301\u5bf9NEW_COL\u5217\u7684\u8bfb\u5199\u3002<br \/>\n\u4e0d\u8fc7\u8fd9\u4e2a\u95ee\u9898\u53ef\u4ee5\u901a\u8fc7INSTEAD OF\u89e6\u53d1\u5668\u5b9e\u73b0\uff0c\u4e0b\u9762\u662f\u4e00\u4e2a\u7b80\u5355\u7684INSERT\u7684\u4f8b\u5b50\uff1a<\/p>\n<pre lang='SQL'>SQL> INSERT INTO T_ADD_COLUMN (ID, NAME) VALUES (12000, 'A');\r\n1 row created.\r\nSQL> SELECT * FROM T_ADD_COLUMN WHERE ID = 12000;\r\n        ID NAME                           NEW_COL\r\n---------- ------------------------------ ------------------------------\r\n     12000 A                              OLD VALUE\r\nSQL> INSERT INTO T_ADD_COLUMN VALUES (12000, 'A', 'TEST');\r\nINSERT INTO T_ADD_COLUMN VALUES (12000, 'A', 'TEST')\r\n*\r\nERROR at line 1:\r\nORA-01733: virtual column not allowed here\r\n\r\nSQL> CREATE OR REPLACE TRIGGER T_INS_I_TADDCOLUMN \r\n  2  INSTEAD OF INSERT ON T_ADD_COLUMN\r\n  3  BEGIN\r\n  4  INSERT INTO T_ADD_COLUMN_BASE\r\n  5  VALUES (:NEW.ID, :NEW.NAME, :NEW.NEW_COL);\r\n  6  END;\r\n  7  \/\r\nTrigger created.\r\nSQL> INSERT INTO T_ADD_COLUMN VALUES (12001, 'B', 'TEST');\r\n1 row created.\r\nSQL> SELECT * FROM T_ADD_COLUMN WHERE ID = 12001;\r\n        ID NAME                           NEW_COL\r\n---------- ------------------------------ ------------------------------\r\n     12001 B                              TEST<\/pre>\n<p>\u89c6\u56fe\u7684\u66f4\u65b0\u548c\u4fee\u6539\u53ef\u4ee5\u91c7\u7528\u7c7b\u4f3c\u7684\u65b9\u6cd5\u5b9e\u73b0\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u770b\u5230ITPUB\u4e0a\u6709\u4eba\u63d0\u5230\uff0c\u5982\u4f55\u5feb\u901f\u7684\u5728\u4e00\u4e2a3\u4ebf\u6761\u8bb0\u5f55\u7684\u8868\u4e2d\u589e\u52a0\u4e00\u4e2a\u5305\u542bDEFAULT\u503c\u7684\u65b0\u5b57\u6bb5\u3002\u63cf\u8ff0\u4e00\u4e0b\u5982\u4f55\u5feb\u901f\u7684\u6dfb\u52a0\u8868\u7684\u9ed8\u8ba4\u503c\u3002 Oracle11\u65b0\u7279\u6027\u2014\u2014\u5728\u7ebf\u64cd\u4f5c\u529f\u80fd\u589e\u5f3a\uff08\u4e8c\uff09 \uff1ahttp:\/\/yangtingkun.itpub.net\/post\/468\/401293 \u5bf9\u4e8e\u8fd9\u4e2a\u95ee\u9898\uff0c\u5e38\u89c4\u7684\u65b9\u6cd5\u6709\u4e09\u4e2a\uff1a \u4e00\u3001\u76f4\u63a5ALTER TABLE ADD COLUMN\uff0c\u8fd9\u79cd\u65b9\u6cd5\u7684\u597d\u5904\u662f\u7b80\u5355\uff0c\u4e00\u4e2a\u547d\u4ee4\u5c31\u53ef\u4ee5\u5b8c\u6210\uff0c\u7f3a\u70b9\u662f\u8017\u65f6\u975e\u5e38\u957f\uff0c\u800c\u4e14\u5728\u6f2b\u957f\u7684\u6267\u884c\u8fc7\u957f\u4e2d\u90fd\u4f1a\u9501\u5b9a\u8868\uff0c\u5bfc\u81f4\u5e94\u7528\u65e0\u6cd5\u4fee\u6539\u6570\u636e\uff0c\u5e76\u4e14\u5728\u5b8c\u6210\u540e\u5bb9\u6613\u9020\u6210\u5927\u91cf\u7684\u884c\u8fc1\u79fb\uff0c\u4ece\u800c\u5f71\u54cd\u540e\u7eed\u8bbf\u95ee\u7684\u6027\u80fd\uff1b \u4e8c\u3001CREATE TABLE AS SELECT\u7684\u65b9\u5f0f\uff0c\u8fd9\u79cd\u65b9\u5f0f\u76f8\u5bf9\u7b2c\u4e00\u79cd\u800c\u8a00\uff0c\u6548\u7387\u66f4\u9ad8\uff0c\u5982\u679c\u662f\u975e\u5f52\u6863\u6a21\u5f0f\uff0c\u90a3\u4e48\u5b8c\u6210\u901f\u5ea6\u4f1a\u66f4\u5feb\u3002\u4f46\u662f\u7f3a\u70b9\u540c\u6837\u5f88\u660e\u663e\uff0c\u9996\u5148\u9700\u8981\u5927\u91cf\u7684\u505c\u673a\u65f6\u95f4\uff0c\u800c\u4e14\u8868\u4e0a\u7684\u7d22\u5f15\u3001\u7ea6\u675f\u3001\u89e6\u53d1\u5668\u4ee5\u53ca\u6743\u9650\u7b49\u90fd\u9700\u8981\u624b\u5de5\u5904\u7406\uff0c\u6bd4\u8f83\u9ebb\u70e6\uff1b \u4e09\u3001\u5728\u7ebf\u91cd\u5b9a\u4e49\uff0c\u8fd9\u79cd\u65b9\u5f0f\u5e94\u8be5\u7b97\u662f\u8fd9\u4e09\u79cd\u4e2d\u6700\u4f73\u7684\uff0c\u9501\u8868\u65f6\u95f4\u975e\u5e38\u77ed\uff0c\u5bf9\u4e1a\u52a1\u5f71\u54cd\u6700\u5c0f\uff0c\u4f46\u662f\u7f3a\u70b9\u662f\u6574\u4e2a\u64cd\u4f5c\u7684\u65f6\u95f4\u5e76\u4e0d\u4f1a\u53d8\u77ed\uff0c\u548c\u7b2c\u4e8c\u79cd\u65b9\u5f0f\u4e00\u6837\uff0c\u90fd\u9700\u89812\u500d\u7684\u5b58\u50a8\u7a7a\u95f4\uff0c\u800c\u4e14\u64cd\u4f5c\u76f8\u5bf9\u590d\u6742\u3002 \u5982\u679c\u6570\u636e\u5e93\u7684\u7248\u672c\u662f11g\uff0c\u90a3\u4e48\u8fd9\u5c31\u4e0d\u662f\u95ee\u9898\u4e86\uff0c\u4ee5\u524d\u5199\u8fc7\u4e13\u95e8\u7684\u6587\u7ae0\uff0c\u63cf\u8ff011g\u662f\u5982\u4f55\u5feb\u901f\u6dfb\u52a0\u4e00\u4e2a\u5305\u542b\u975e\u7a7aDEFAULT\u503c\u7684\u5217\u7684\u3002\u90a3\u4e48\u5bf9\u4e8e10g\u53ca\u4ee5\u524d\u7248\u672c\u7684\u6570\u636e\u5e93\u800c\u8a00\uff0c\u589e\u52a0\u4e00\u4e2a\u5305\u542b\u9ed8\u8ba4\u503c\u7684\u5b57\u6bb5\u96be\u9053\u5c31\u771f\u7684\u8981\u5fcd\u53d7\u6f2b\u957f\u7684\u6267\u884c\u65f6\u95f4\u548c\u5927\u91cf\u7684REDO\u3001UNDO\u7684\u5360\u7528\u5417\u3002 \u5176\u5b9e\u5b8c\u5168\u53ef\u4ee5\u4eff\u716711g\u7684\u65b9\u5f0f\uff0c\u6765\u81ea\u5df1\u5b9e\u73b010g\u4e2d\u5b57\u6bb5\u7684\u5feb\u901f\u6dfb\u52a0\u3002\u8bb0\u5f97Tom\u5728\u63cf\u8ff0\u6570\u636e\u5e93\u7684\u89e3\u6790\u65f6\u63d0\u5230\u8fc7\uff0c\u8f6f\u89e3\u6790\u8981\u4f18\u4e8e\u786c\u89e3\u6790\uff0c\u8f6f\u8f6f\u89e3\u6790\u8981\u4f18\u4e8e\u8f6f\u89e3\u6790\uff0c\u800c\u901f\u5ea6\u6700\u5feb\u7684\u83ab\u8fc7\u4e8e\u4e0d\u89e3\u6790\u3002\u63d0\u9ad8\u901f\u5ea6\u7684\u6700\u9ad8\u5883\u754c\u5c31\u662f\u6839\u672c\u4e0d\u505a\u3002 \u90a3\u4e48\u5bf9\u4e8e\u6dfb\u52a0\u9ed8\u8ba4\u503c\u7684\u65b9\u5f0f\u4e5f\u53ef\u4ee5\u624d\u6709\u8fd9\u79cd\u65b9\u6cd5\uff0c\u5bf9\u4e8e\u5df2\u7ecf\u5b58\u5728\u7684\u8bb0\u5f55\u7684\u9ed8\u8ba4\u503c\uff0c\u6211\u4eec\u6839\u672c\u4e0d\u53bb\u6dfb\u52a0\uff0c\u4e00\u4e2a\u7b80\u5355\u7684\u4f8b\u5b50\u5982\u4e0b\uff1a SQL> CREATE TABLE T_ADD_COLUMN (ID NUMBER, NAME VARCHAR2(30)); Table created. 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