{"id":1509,"date":"2018-07-10T00:11:10","date_gmt":"2018-07-09T16:11:10","guid":{"rendered":"https:\/\/yangtingkun.net\/?p=1509"},"modified":"2018-07-10T00:11:10","modified_gmt":"2018-07-09T16:11:10","slug":"update%e8%af%ad%e5%8f%a5%e6%98%af%e5%90%a6%e5%b8%a6%e6%9c%89where%e8%af%ad%e5%8f%a5%e5%af%b9%e6%9b%b4%e6%96%b0%e9%87%8d%e5%90%af%e5%8a%a8%e7%9a%84%e5%bd%b1%e5%93%8d","status":"publish","type":"post","link":"https:\/\/yangtingkun.net\/?p=1509","title":{"rendered":"UPDATE\u8bed\u53e5\u662f\u5426\u5e26\u6709WHERE\u8bed\u53e5\u5bf9\u66f4\u65b0\u91cd\u542f\u52a8\u7684\u5f71\u54cd"},"content":{"rendered":"

\u6700\u8fd1\u770b\u5230\u4e00\u4e2a\u6bd4\u8f83\u6709\u610f\u601d\u7684\u4f8b\u5b50\uff0c\u662f\u548c\u66f4\u65b0\u91cd\u542f\u52a8\u6709\u5173\u3002<\/p>\n

\u66f4\u65b0\u91cd\u542f\u52a8\u662fOracle\u4e2d\u4e00\u4e2a\u9690\u85cf\u7684\u77e5\u8bc6\u70b9\uff0c\u5f53Oracle\u5728\u8bfb\u53d6\u6570\u636e\u65f6\uff0c\u4f1a\u6784\u9020\u8bfb\u4e00\u81f4\u6027\uff0c\u5f53\u8bfb\u53d6\u7684\u5185\u5bb9\u53d1\u751f\u4e86\u4fee\u6539\uff0cOracle\u4f1a\u901a\u8fc7UNDO\u4fe1\u606f\u6765\u8fd8\u539f\u6570\u636e\u7684\u524d\u955c\u50cf\uff0c\u628a\u6570\u636e\u8fd8\u539f\u5230\u67e5\u8be2\u53d1\u751f\u7684\u65f6\u523b\uff0c\u901a\u8fc7\u6784\u9020\u4e00\u81f4\u6027\u7684\u7ed3\u679c\u6765\u5b9e\u73b0\u8bfb\u53d6\u6570\u636e\u7684\u4e00\u81f4\u6027\u548c\u9694\u79bb\u6027\u3002<\/p>\n

Oracle\u5b9e\u73b0\u7684\u8bfb\u4e00\u81f4\u6027\u4e5f\u88ab\u79f0\u4e3a\u591a\u7248\u672c\u8bfb\u4e00\u81f4\u6027\uff0c\u6bcf\u4e2a\u4f1a\u8bdd\u90fd\u4f1a\u6784\u9020\u81ea\u5df1\u7684\u4e00\u81f4\u6027\u67e5\u8be2\u7248\u672c\u3002\u4f46\u662f\u5bf9\u4e8e\u5199\u64cd\u4f5c\u800c\u8a00\uff0c\u8fd9\u79cd\u65b9\u5f0f\u662f\u4e0d\u53ef\u80fd\u7684\uff0c\u56e0\u4e3a\u6700\u7ec8\u7684\u6570\u636e\u53ea\u6709\u4e00\u4efd\uff0c\u5982\u8981\u8981\u4fee\u6539\u6570\u636e\uff0c\u5c31\u53ea\u80fd\u4fee\u6539\u552f\u4e00\u7684\u8fd9\u4efd\u6570\u636e\uff0c\u6240\u4ee5\u5bf9\u8bfb\u64cd\u4f5c\uff0c\u8bbf\u95ee\u7684\u662f\u4e00\u81f4\u6027\u7248\u672c\uff0c\u800c\u5bf9\u4e8e\u5199\u64cd\u4f5c\uff0c\u4fee\u6539\u7684\u6c38\u8fdc\u662f\u5f53\u524d\u7248\u672c\u3002<\/p>\n

\u65e2\u7136\u5199\u64cd\u4f5c\u53ea\u80fd\u4fee\u6539\u5f53\u524d\u7248\u672c\uff0c\u5f53\u5199\u64cd\u4f5c\u6267\u884c\u7684\u8fc7\u7a0b\u4e2d\uff0c\u53d1\u73b0\u8981\u4fee\u6539\u7684\u8bb0\u5f55\u53d1\u751f\u4e86\u53d8\u5316\uff0c\u7834\u574f\u4e86\u66f4\u65b0\u53d1\u8d77\u65f6\u523b\u7684\u4e00\u81f4\u6027\uff0c\u8fd9\u65f6\u5c31\u89e6\u53d1\u4e86\u66f4\u65b0\u91cd\u542f\u52a8\uff0c\u4e5f\u5c31\u662f\u8bf4\u66f4\u65b0\u64cd\u4f5c\u4f1a\u653e\u5f03\u4e4b\u524d\u7684\u4fee\u6539\uff0c\u7136\u540e\u91cd\u65b0\u53d1\u8d77\u4e00\u6b21\u65b0\u7684\u66f4\u65b0\u64cd\u4f5c\u3002<\/p>\n

ITPUB\u4e0a\u6709\u4e00\u4e2a\u6709\u610f\u601d\u7684\u6848\u4f8b\uff0c\u5c55\u793a\u7684\u5c31\u662f\u66f4\u65b0\u91cd\u542f\u52a8\u73b0\u8c61\uff0c\u94fe\u63a5\u5982\u4e0b\uff1ahttp:\/\/www.itpub.net\/forum.php?mod=viewthread&tid=2102897<\/a><\/p>\n

\u8fd9\u91cc\u6765\u91cd\u73b0\u4e00\u4e0b\u66f4\u65b0\u91cd\u542f\u52a8\uff0c\u5efa\u7acb\u4e00\u5f20\u7b80\u5355\u6d4b\u8bd5\u7528\u8868\uff0c\u5728\u4f1a\u8bdd\u4e00\u63d2\u5165\u521d\u59cb\u6570\u636e\u5e76\u8fdb\u884c\u66f4\u65b0\u64cd\u4f5c\uff1a<\/p>\n

SQL> SET SQLP ‘SQL1> ‘
\nSQL1> CREATE TABLE T_UPDATE (ID NUMBER);<\/p>\n

Table created.<\/p>\n

SQL1> INSERT INTO T_UPDATE SELECT ROWNUM FROM DUAL CONNECT BY LEVEL < 4;<\/p>\n

3 rows created.<\/p>\n

SQL1> COMMIT;<\/p>\n

Commit complete.<\/p>\n

SQL1> SELECT * FROM T_UPDATE;<\/p>\n

ID
\n———-
\n1
\n2
\n3<\/p>\n

SQL1> UPDATE T_UPDATE SET ID = 4 WHERE ID > 2;<\/p>\n

1 row updated.<\/p>\n

\u5728\u4f1a\u8bdd2\u53d1\u8d77UPDATE\u8bed\u53e5\uff0c\u66f4\u65b0ID\u5927\u4e8e0\u7684\u8bb0\u5f55\uff0c\u8fd9\u65f6UPDATE\u64cd\u4f5c\u7531\u4e8e\u4f1a\u8bdd1\u66f4\u65b0\u4e86ID\u4e3a3\u7684\u8bb0\u5f55\u4e14\u672a\u63d0\u4ea4\uff0c\u4f1a\u5904\u4e8e\u6302\u8d77\u72b6\u6001\uff1a<\/p>\n

SQL> SET SQLP ‘SQL2> ‘
\nSQL2> UPDATE T_UPDATE SET ID = ID + 0.1 WHERE ID > 0;<\/p>\n

\u7136\u540e\u5728\u4f1a\u8bdd3\u63d2\u5165\u4e00\u6761\u65b0\u7684\u8bb0\u5f55\uff0c\u5e76\u63d0\u4ea4\uff1a<\/p>\n

SQL> SET SQLP ‘SQL3> ‘
\nSQL3> INSERT INTO T_UPDATE VALUES (0.1);<\/p>\n

1 row created.<\/p>\n

SQL3> COMMIT;<\/p>\n

Commit complete.<\/p>\n

\u8fd9\u65f6\u56de\u5230\u4f1a\u8bdd1\uff0c\u8fdb\u884c\u63d0\u4ea4\uff1a<\/p>\n

SQL1> COMMIT;<\/p>\n

Commit complete.<\/p>\n

\u68c0\u67e5\u4f1a\u8bdd2\uff0c\u53d1\u73b0\u66f4\u65b0\u91cd\u542f\u52a8\u53d1\u751f\uff0cUPDATE\u64cd\u4f5c\u66f4\u65b0\u4e864\u6761\u8bb0\u5f55\uff1a<\/p>\n

4 rows updated.<\/p>\n

SQL2> SELECT * FROM T_UPDATE;<\/p>\n

ID
\n———-
\n1.1
\n2.1
\n4.1
\n.2<\/p>\n

\u4f1a\u8bdd2\u4e2d\u4e0d\u4ec5\u66f4\u65b0\u4e86\u4e4b\u524d\u5b58\u5728\u7684\u4e09\u6761\u8bb0\u5f55\uff0c\u8fde\u66f4\u65b0\u8bed\u53e5\u53d1\u8d77\u4e4b\u540e\u63d2\u5165\u5e76\u63d0\u4ea4\u7684\u7b2c\u56db\u6761\u8bb0\u5f55\u4e5f\u4e00\u8d77\u8fdb\u884c\u4e86\u66f4\u65b0\uff0c\u8fd9\u8bf4\u660e\u66f4\u65b0\u91cd\u542f\u52a8\u53d1\u751f\u5728\u7b2c\u56db\u6761\u8bb0\u5f55\u63d2\u5165\u4e4b\u540e\u3002<\/p>\n

\u8fd9\u4e2a\u6848\u4f8b\u5f88\u597d\u7684\u5c55\u793a\u4e86\u66f4\u65b0\u91cd\u542f\u52a8\u73b0\u8c61\uff0c\u4e0d\u8fc7\u8fd9\u4e2a\u5e16\u5b50\u5e76\u6ca1\u6709\u5b8c\uff0c\u9664\u4e86\u8fd9\u4e2a\u66f4\u65b0\u91cd\u542f\u52a8\u7684\u6848\u4f8b\u5916\uff0c\u8fd8\u5c55\u793a\u4e86\u4e00\u4e2a\u53e6\u5916\u4e00\u4e2a\u6848\u4f8b\uff0c\u64cd\u4f5c\u548c\u8fd9\u4e2a\u6848\u4f8b\u4ec5\u6709\u5f88\u5c0f\u7684\u5dee\u522b\uff0c\u4f46\u662f\u7ed3\u679c\u5374\u5927\u4e0d\u76f8\u540c\u3002<\/p>\n

\u9996\u5148\u628a\u6570\u636e\u6062\u590d\u5230\u521d\u59cb\u72b6\u6001\uff0c\u5728\u4f1a\u8bdd2\u56de\u6eda\u4e4b\u524d\u7684\u66f4\u65b0\uff1a<\/p>\n

SQL2> ROLLBACK;<\/p>\n

Rollback complete.<\/p>\n

\u5728\u4f1a\u8bdd1\uff0c\u6062\u590d\u521d\u59cb\u7684\u6570\u636e\u60c5\u51b5\uff0c\u7136\u540e\u5f00\u59cb\u66f4\u65b0\u6570\u636e\uff1a<\/p>\n

SQL1> DELETE T_UPDATE WHERE ID < 1;<\/p>\n

1 row deleted.<\/p>\n

SQL1> UPDATE T_UPDATE SET ID = 3 WHERE ID = 4;<\/p>\n

1 row updated.<\/p>\n

SQL1> COMMIT;<\/p>\n

Commit complete.<\/p>\n

SQL1> SELECT * FROM T_UPDATE;<\/p>\n

ID
\n———-
\n1
\n2
\n3<\/p>\n

SQL1> UPDATE T_UPDATE SET ID = 4 WHERE ID > 2;<\/p>\n

1 row updated.<\/p>\n

\u5728\u4f1a\u8bdd2\uff0c\u5bf9\u8868\u4e2d\u6240\u6709\u7684\u8bb0\u5f55\u7684ID\u6267\u884cUPDATE\u64cd\u4f5c\uff0c\u548c\u4e0a\u4e00\u4e2a\u6848\u4f8b\u7684\u552f\u4e00\u5dee\u522b\u662f\uff0c\u8fd9\u91cc\u6ca1\u6709\u4f7f\u7528WHERE\u8bed\u53e5\uff1a<\/p>\n

SQL2> UPDATE T_UPDATE SET ID = ID + 0.1;<\/p>\n

\u540c\u6837\u5728\u4f1a\u8bdd3\u63d2\u5165\u6570\u636e\u5e76\u63d0\u4ea4\uff1a<\/p>\n

SQL3> INSERT INTO T_UPDATE VALUES (0.1);<\/p>\n

1 row created.<\/p>\n

SQL3> COMMIT;<\/p>\n

Commit complete.<\/p>\n

\u56de\u5230\u4f1a\u8bdd1\uff0c\u8fdb\u884c\u63d0\u4ea4\uff1a<\/p>\n

SQL1> COMMIT;<\/p>\n

 <\/p>\n

Commit complete.<\/p>\n

\u53d1\u73b0\u4f1a\u8bdd2\u4ec5\u66f4\u65b0\u4e863\u6761\u8bb0\u5f55\uff1a<\/p>\n

 <\/p>\n

3 rows updated.<\/p>\n

 <\/p>\n

SQL2> SELECT * FROM T_UPDATE;<\/p>\n

ID
\n———-
\n1.1
\n2.1
\n4.1
\n.1<\/p>\n

\u53ef\u4ee5\u6e05\u6670\u7684\u770b\u5230\uff0c\u6700\u540e\u4e00\u6761\u63d2\u5165\u7684\u8bb0\u5f55\u5e76\u672a\u88ab\u66f4\u65b0\uff0c\u8bf4\u660e\u66f4\u65b0\u91cd\u542f\u52a8\u5e76\u672a\u88ab\u89e6\u53d1\u3002<\/p>\n

\u4e3a\u4ec0\u4e48\u5e26\u6709WHERE\u6761\u4ef6\u7684\u66f4\u65b0\u64cd\u4f5c\u89e6\u53d1\u4e86\u66f4\u65b0\u91cd\u542f\u52a8\uff0c\u800c\u4e0d\u5e26WHERE\u6761\u4ef6\u7684\u66f4\u65b0\u672a\u89e6\u53d1\u91cd\u542f\u52a8\u5462\uff0c\u6211\u662f\u8fd9\u6837\u7406\u89e3\u7684\uff1a\u5f53UPDATE\u64cd\u4f5c\u5305\u542b\u4e86WHERE\u6761\u4ef6\uff0c\u90a3\u4e48\u8fd9\u4e2a\u67e5\u8be2\u7684\u7ed3\u679c\u8981\u6ee1\u8db3WHERE\u5b9a\u4e49\u7684\u67e5\u8be2\u4e00\u81f4\u6027\uff0c\u5f53\u66f4\u65b0\u53d1\u73b0\u4e00\u81f4\u6027\u4e0d\u6ee1\u8db3\u7684\u60c5\u51b5\u4e0b\uff0c\u5c31\u4f1a\u89e6\u53d1\u66f4\u65b0\u91cd\u542f\u52a8\u3002\u800c\u5bf9\u4e8e\u4e0d\u5305\u542bWHERE\u6761\u4ef6\u6216\u5305\u542bWHERE\u6761\u4ef6\u4f46\u662f\u8be5\u6761\u4ef6\u4e0e\u8868\u67e5\u8be2\u65e0\u5173\u7684\u60c5\u51b5\uff0c\u8fd9\u65f6Oracle\u7684\u76ee\u6807\u53ea\u662f\u5c06\u8868\u4e2d\u6240\u6709\u7684\u6570\u636e\u8fdb\u884c\u4e00\u6b21\u66f4\u65b0\uff0c\u5e76\u4e0d\u9700\u8981\u8003\u8651\u4e00\u81f4\u6027\u7684\u95ee\u9898\u3002\u56e0\u6b64\uff0c\u8fd9\u4e2a\u4e0d\u52a0WHERE\u6761\u4ef6\u7684UPDATE\uff0c\u611f\u89c9\u5176\u5b9e\u73b0\u65b9\u5f0f\u4e0a\u7c7b\u4f3c\u8fd9\u79cd\u901a\u8fc7ORA_ROWSCN\u9650\u5b9a\u6765\u5b9e\u73b0\uff1a<\/p>\n

SQL2> ROLLBACK;<\/p>\n

 <\/p>\n

Rollback complete.<\/p>\n

\u56de\u5230\u4f1a\u8bdd1\u6062\u590d\u6570\u636e\uff0c\u5e76\u68c0\u67e5ORA_ROWSCN\u7684\u503c\uff1a<\/p>\n

SQL1> DELETE T_UPDATE WHERE ID < 1;<\/p>\n

1 row deleted.<\/p>\n

SQL1> UPDATE T_UPDATE SET ID = 3 WHERE ID = 4;<\/p>\n

1 row updated.<\/p>\n

SQL1> COMMIT;<\/p>\n

Commit complete.<\/p>\n

SQL1> SELECT ID, ORA_ROWSCN FROM T_UPDATE;
\nID ORA_ROWSCN
\n———- ———-
\n1\u00a0 231512964
\n2\u00a0 231512964
\n3\u00a0 231512964<\/p>\n

SQL1> UPDATE T_UPDATE SET ID = 4 WHERE ID > 2;<\/p>\n

1 row updated.<\/p>\n

\u5728\u4f1a\u8bdd2\uff0c\u53d1\u8d77\u5305\u542b\u5236\u5b9aORA_ROWSCN\u9650\u5236\u6761\u4ef6\u7684\u66f4\u65b0\uff1a<\/p>\n

SQL2> UPDATE T_UPDATE SET ID = ID + 0.1 WHERE ORA_ROWSCN = 231512964;<\/p>\n

\u4f1a\u8bdd3\u63d2\u5165\u5e76\u63d0\u4ea4\uff1a<\/p>\n

SQL3> INSERT INTO T_UPDATE VALUES (0.1);<\/p>\n

1 row created.<\/p>\n

SQL3> COMMIT;<\/p>\n

Commit complete.<\/p>\n

\u56de\u5230\u4f1a\u8bdd1\uff0c\u8fdb\u884c\u63d0\u4ea4\uff1a<\/p>\n

SQL1> COMMIT;<\/p>\n

Commit complete.<\/p>\n

\u68c0\u67e5\u4f1a\u8bdd2\uff1a<\/p>\n

3 rows updated.<\/p>\n

SQL2> SELECT * FROM T_UPDATE;<\/p>\n

ID
\n———-
\n1.1
\n2.1
\n4.1
\n.1<\/p>\n

\u91c7\u7528ORA_ROWSCN\u7684\u6548\u679c\u4e0e\u76f4\u63a5UPDATE\u4e0d\u5e26\u4efb\u4f55WHERE\u6761\u4ef6\u662f\u4e00\u6837\u7684\uff0c\u8bf4\u660e\u66f4\u65b0\u53ea\u5173\u6ce8UPDATE\u8bed\u53e5\u53d1\u51fa\u65f6\u523b\u7684\u6570\u636e\uff0c\u4e0d\u518d\u8003\u8651\u6574\u4f53\u66f4\u65b0\u7ed3\u679c\u7684\u4e00\u81f4\u6027\u95ee\u9898\u3002<\/p>\n

\u5173\u4e8e\u66f4\u65b0\u91cd\u542f\u52a8\u7684\u66f4\u8be6\u7ec6\u7684\u63cf\u8ff0\uff0c\u5efa\u8bae\u53c2\u8003ASKTOM\u4e0a\u7684\u56de\u590d\uff1ahttps:\/\/asktom.oracle.com\/pls\/apex\/asktom.search?tag=write-consistency<\/a><\/p>\n

 <\/p>\n

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

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