{"id":109,"date":"2013-04-28T15:27:32","date_gmt":"2013-04-28T07:27:32","guid":{"rendered":"http:\/\/www.dongcb.com\/?p=109"},"modified":"2013-04-28T15:27:32","modified_gmt":"2013-04-28T07:27:32","slug":"java%e4%bd%bf%e7%94%a8sql%e4%b9%8b%e4%bd%bf%e7%94%a8for-update%e9%94%81%e5%ae%9a%e8%a1%a8","status":"publish","type":"post","link":"https:\/\/www.dongchangbin.net.cn\/?p=109","title":{"rendered":"java\u4f7f\u7528sql\u4e4b\u4f7f\u7528for update\u9501\u5b9a\u8868"},"content":{"rendered":"

\u4e00\uff1a<\/p>\n

1>\u9996\u5148for update\u662f\u5bf9\u8868\u7684\u884c\u8fdb\u884c\u9501\u5b9a\u3002\u9501\u5b9a\u5c31\u597d\u6bd4\u6211\u4eec\u5b66java Thread\u90a3\u4e00\u7ae0\u65f6\uff0c\u4e3a\u67d0\u4e2a\u7ebf\u7a0b\u7684run\uff08\uff09\u67b7\u9501\uff0c\u5f53\u5b9e\u4f8b\u5316\u51fa\u6765\u591a\u4e2a\u7ebf\u7a0b\u65f6\uff0c\u5b83\u5fc5\u987b\u4e00\u4e2a\u7ebf\u7a0b\u5168\u90e8\u6267\u884c\u5b8c\u540e\uff0c\u91ca\u653e\u9501\u5176\u4ed6\u7ebf\u7a0b\u624d\u6709\u673a\u4f1a\u8fd0\u884c\u3002\u672c\u6587for update\u529f\u80fd\u4e0a\u4e00\u6837\uff0c\u5c31\u662f\u4e3a\u4e00\u4e2aselect\u8bed\u53e5\u67b7\u9501\uff0c\u8fd9\u6837\u5728\u5bf9\u8fd9\u4e2a\u8868\u8fdb\u884cupdate \uff0cdelete\u65f6\u5c31\u4f1a\u5904\u4e8e\u7b49\u5f85\u72b6\u6001\uff0c\u7b49\u5f85selec\u6267\u884ccommit\u6216rollback(\u76f8\u5f53\u4e8e\u7ebf\u7a0b\u91ca\u653e\u9501)\u540e\uff0c\u624d\u53ef\u4ee5\u5bf9\u8868\u8fdb\u884c\u66f4\u6539\u6216\u5220\u9664\u3002<\/p>\n

\u600e\u6837\u770b\u6548\u679c\u5462\uff1f1:\u9996\u5148\u5728\u201c\u8fd0\u884c\u201d–>cmd–>\u8fde\u63a5\u6570\u636e\u5e93 \u6267\u884cselect * from emp for update<\/p>\n

2 :\u7136\u540e\u5728\u6253\u5f00\u53e6\u4e00\u4e2a\u7a97\u53e3\uff08\u5c31\u76f8\u5f53\u4e8e\u521b\u5efa\u4e86\u4e24\u4e2a\u7528\u6237\uff09\uff1a\u201c\u8fd0\u884c\u201d–>cmd–>\u8fde\u63a5\u6570\u636e\u5e93 \u00a0\u6267\u884cupdate emp set sal=100;\u4f60\u4f1a\u53d1\u73b0\u5b83\u4e0d\u6267\u884c\u4e86\u3002<\/p>\n

2>\u90a3\u9a6cfor update\u4e0efor update of \u6709\u795e\u9a6c\u533a\u522b\u5462\uff1f<\/p>\n

1.select * from Table1 for update \u9501\u5b9a\u8868\u7684\u6240\u6709\u884c\uff0c\u53ea\u80fd\u8bfb\u4e0d\u80fd\u5199<\/p>\n

2\u00a0 select * from Table1 where id = 1 for update \u53ea\u9501\u5b9aid=1\u7684\u884c<\/p>\n

3\u00a0 select * from Table1 a join Table2 b on a.id=b.id for update \u9501\u5b9a\u4e24\u4e2a\u8868\u7684\u6240\u6709\u8bb0\u5f55<\/p>\n

4 select * from Table1 a join Table2 b on a.id=b.id where a.id = 10 for update \u9501\u5b9a\u4e24\u4e2a\u8868\u7684\u4e2d\u6ee1\u8db3\u6761\u4ef6\u7684\u884c<\/p>\n

5. select * from Table1 a join Table2 b on a.id=b.id where a.id = 10 for update of a.id \u53ea\u9501\u5b9aTable1\u4e2d\u6ee1\u8db3\u6761\u4ef6\u7684\u884c<\/p>\n

for update \u662f\u628a\u6240\u6709\u7684\u8868\u90fd\u9501\u70b9 for update of \u6839\u636eof \u540e\u8868\u7684\u6761\u4ef6\u9501\u5b9a\u76f8\u5bf9\u5e94\u7684\u8868<\/p>\n

3>\u5173\u4e8eoracle\uff1aselect…for update of columns<\/p>\n

\u6309\u71671>\u6b65\u9aa4\u6267\u884c1\uff1aselect * from emp for update of sal\u5728\u53e6\u4e00\u4e2a\u7a97\u53e3\u4e2d\u6267:2\uff1aupdate emp set job=’clerk’ where empno=10;\u6309\u71672>\u7684\u7684\u601d\u7ef4\u6211\u4eec\u53ef\u80fd\u8ba4:\u201c1\u201d\u53ea\u9501\u5b9a\u4e86emp\u8868\u7684sal\u5217\uff0c\u5176\u5b9e\u4e0d\u7136\u5f53\u8fd0\u884c\u201c2\u201d\u65f6\uff0c\u6211\u4eec\u53d1\u73b0\u5b83\u4efb\u7136\u4e0d\u6267\u884c\uff0c\u6240\u4ee5for update of columns \u662f\u9501\u5b9a\u7684\u4e0esal\u76f8\u5173\u7684\u884c\u3002\u90a3\u4e48for update \u4e0efor update of \u6709\u795e\u5417\u533a\u522b\u5462\uff1f\u533a\u522b\u5728\u4e8e\u591a\u8868\u8fde\u63a5\u65f6\uff1b<\/p>\n

\u4f8b\u5982\uff1a<\/p>\n

\u6309\u71671>\u5206\u522b\u6267\u884c select ename,dname from emp,dept where emp.deptno=dept.deptno for update;<\/p>\n

\u53e6\u4e00\u7a97\u53e3\u6267\u884c\uff1aupdate dept set dname=’haha’where deptno=10\uff1b\u6211\u4eec\u53d1\u73b0dept\u8868\u4e0d\u80fd\u66f4\u6539<\/p>\n

\u5f53\u6211\u4eec\u5728 select ename,dname from emp,dept where emp.deptno=dept.deptno for update of sal;\u65f6<\/p>\n

update dept set dname=’haha’where deptno=10\uff1b\u53ef\u4ee5\u5728\u6267\u884c\u4e86\u3002<\/p>\n

\u7531\u6b64\u6211\u4eec\u53ef\u4ee5\u7efc\u7ed3\u51fa\uff1afor update of columns \u7528\u5728\u591a\u8868\u8fde\u63a5\u9501\u5b9a\u65f6\uff0c\u53ef\u4ee5\u6307\u5b9a\u8981\u9501\u5b9a\u7684\u662f\u54ea\u51e0\u5f20\u8868\uff0c\u800c\u5982\u679c\u8868\u4e2d\u7684\u5217\u6ca1\u6709\u5728for update of \u540e\u9762\u51fa\u73b0\u7684\u8bdd\uff0c\u5c31\u610f\u5473\u7740\u8fd9\u5f20\u8868\u5176\u5b9e\u5e76\u6ca1\u6709\u88ab\u9501\u5b9a\uff0c\u5176\u4ed6\u7528\u6237\u662f\u53ef\u4ee5\u5bf9\u8fd9\u4e9b\u8868\u7684\u6570\u636e\u8fdb\u884cupdate\u64cd\u4f5c\u7684\u3002\u8fd9\u79cd\u60c5\u51b5\u7ecf\u5e38\u4f1a\u51fa\u73b0\u5728\u7528\u6237\u5bf9\u5e26\u6709\u8fde\u63a5\u67e5\u8be2\u7684\u89c6\u56fe\u8fdb\u884c\u64cd\u4f5c\u573a\u666f\u4e0b\u3002\u7528\u6237\u53ea\u9501\u5b9a\u76f8\u5173\u8868\u7684\u6570\u636e\uff0c\u5176\u4ed6\u7528\u6237\u4ecd\u7136\u53ef\u4ee5\u5bf9\u89c6\u56fe\u4e2d\u5176\u4ed6\u539f\u59cb\u8868\u7684\u6570\u636e\u6765\u8fdb\u884c\u64cd\u4f5c\u3002<\/p>\n

4>\u5173\u4e8enowait\u4e0ewait<\/p>\n

SELECT … FOR UPDATE [OF column_list][WAIT n|NOWAIT][SKIP LOCKED];
\n1\uff1a\u5176\u4e2d\uff1a<\/p>\n

OF \u5b50\u53e5\u7528\u4e8e\u6307\u5b9a\u5373\u5c06\u66f4\u65b0\u7684\u5217\uff0c\u5373\u9501\u5b9a\u884c\u4e0a\u7684\u7279\u5b9a\u5217\u3002<\/p>\n

NOWAIT\u4e0d\u8fdb\u884c\u7b49\u5f85\uff0c\u5982\u679c\u8fd9\u6761\u8bed\u53e5\u7684\u9501\u6ca1\u88ab\u91ca\u653e\uff0c\u5219\u4f1a\u76f4\u63a5\u62a5\u51fa\uff1a\u7cfb\u7edf\u8d44\u6e90\u6b63\u5fd9
\nWAIT \u5b50\u53e5\u6307\u5b9a\u7b49\u5f85\u5176\u4ed6\u7528\u6237\u91ca\u653e\u9501\u7684\u79d2\u6570\uff0c\u9632\u6b62\u65e0\u9650\u671f\u7684\u7b49\u5f85\u3002
\n\u201c\u4f7f\u7528FOR UPDATE WAIT\u201d\u5b50\u53e5\u7684\u4f18\u70b9\u5982\u4e0b\uff1a
\n\uff11\u9632\u6b62\u65e0\u9650\u671f\u5730\u7b49\u5f85\u88ab\u9501\u5b9a\u7684\u884c\uff1b
\n\uff12\u5141\u8bb8\u5e94\u7528\u7a0b\u5e8f\u4e2d\u5bf9\u9501\u7684\u7b49\u5f85\u65f6\u95f4\u8fdb\u884c\u66f4\u591a\u7684\u63a7\u5236\u3002
\n\uff13\u5bf9\u4e8e\u4ea4\u4e92\u5f0f\u5e94\u7528\u7a0b\u5e8f\u975e\u5e38\u6709\u7528\uff0c\u56e0\u4e3a\u8fd9\u4e9b\u7528\u6237\u4e0d\u80fd\u7b49\u5f85\u4e0d\u786e\u5b9a
\n\uff14 \u82e5\u4f7f\u7528\u4e86skip locked\uff0c\u5219\u53ef\u4ee5\u8d8a\u8fc7\u9501\u5b9a\u7684\u884c\uff0c\u4e0d\u4f1a\u62a5\u544a\u7531wait n \u5f15\u53d1\u7684\u2018\u8d44\u6e90\u5fd9\u2019\u5f02\u5e38\u62a5\u544a\u00a0:<\/p>\n

2\uff1a\u73b0\u5728\u6267\u884c\u5982\u4e0b\u64cd\u4f5c\uff1a<\/p>\n

\u5728plsql develope\u4e2d\u6253\u5f00\u4e24\u4e2asql\u7a97\u53e3\uff0c\u00a0\u57281\u7a97\u53e3\u4e2d\u8fd0\u884csql
\nselect * from t where a=’1′ for update;
\n\u57282\u7a97\u53e3\u4e2d\u8fd0\u884csql1
\n1. select * from t where a=’1′; \u8fd9\u4e00\u70b9\u95ee\u9898\u4e5f\u6ca1\u6709\uff0c\u56e0\u4e3a\u884c\u7ea7\u9501\u4e0d\u4f1a\u5f71\u54cd\u7eaf\u7cb9\u7684select\u8bed\u53e5
\n\u518d\u8fd0\u884csql2
\n2. select * from t where a=’1′ for update; \u5219\u8fd9\u4e00\u53e5sql\u5728\u6267\u884c\u65f6\uff0c\u6c38\u8fdc\u5904\u4e8e\u7b49\u5f85\u72b6\u6001\u9664\u975e\u7a97\u53e31\u4e2dsql \u88ab\u63d0\u4ea4\u6216\u56de\u6eda\u3002
\n\u5982\u4f55\u624d\u80fd\u8ba9sql2\u4e0d\u7b49\u5f85\u6216\u7b49\u5f85\u6307\u5b9a\u7684\u65f6\u95f4\u5462\uff1f \u6211\u4eec\u518d\u8fd0\u884csql3
\n3. select * from t where a=’1′ for update nowait; \u5219\u5728\u6267\u884c\u6b64sql\u65f6\uff0c\u76f4\u63a5\u62a5\u8d44\u6e90\u5fd9\u7684\u5f02\u5e38\u3002
\n\u82e5\u6267\u884c select * from t where a=’1′ for update wait 6; \u5219\u5728\u7b49\u5f856\u79d2\u540e\uff0c\u62a5 \u8d44\u6e90\u5fd9\u7684\u5f02\u5e38\u3002\u00a0\u5982\u679c\u6211\u4eec\u6267\u884c sql4
\n4. select * from t where a=’1′ for update nowait skip Locked; \u5219\u6267\u884csql\u65f6\uff0c\u5373\u4e0d\u7b49\u5f85\uff0c\u4e5f\u4e0d\u62a5\u8d44\u6e90 \u5fd9\u5f02\u5e38\u3002
\n\u73b0\u5728\u6211\u4eec\u770b\u770b\u6267\u884c\u5982\u4e0b\u64cd\u4f5c\u5c06\u4f1a\u53d1\u751f\u4ec0\u4e48\u5462\uff1f
\n\u5728\u7a97\u53e31\u4e2d\u6267\u884c\uff1a
\nselect * from t where rownum<=3 nowait skip Locked;
\n\u5728\u7a97\u53e32\u4e2d\u6267\u884c\uff1a
\nselect * from t where rownum<=6 nowait skip Locked;
\nselect for update \u4e5f\u5c31\u5982\u6b64\u4e86\u5427\uff0cinsert\u3001update\u3001delete\u64cd\u4f5c\u9ed8\u8ba4\u52a0\u884c\u7ea7\u9501\uff0c\u5176\u539f\u7406\u548c\u64cd\u4f5c\u4e0eselect for update\u5e76\u65e0\u4e24\u6837\u3002
\nselect for update of\uff0c\u8fd9\u4e2aof\u5b50\u53e5\u5728\u7275\u8fde\u5230\u591a\u4e2a\u8868\u65f6\uff0c\u5177\u6709\u8f83\u5927\u4f5c\u7528\uff0c\u5982\u4e0d\u4f7f\u7528of\u6307\u5b9a\u9501\u5b9a\u7684\u8868\u7684\u5217\uff0c\u5219\u6240\u6709\u8868\u7684\u76f8\u5173\u884c\u5747\u88ab\u9501\u5b9a\uff0c\u82e5\u5728of\u4e2d\u6307\u5b9a\u4e86\u9700\u4fee\u6539\u7684\u5217\uff0c\u5219\u53ea\u6709\u4e0e\u8fd9\u4e9b\u5217\u76f8\u5173\u7684\u8868\u7684\u884c\u624d\u4f1a\u88ab\u9501\u5b9a.<\/p>\n

\u4e8c\uff1a<\/p>\n

1\uff1a<\/p>\n

\u5982\u679c\u4f60\u60f3\u5220\u9664\u6216\u8005\u66f4\u65b0\u88abSelect For Update\u5f15\u7528\u7684\u8bb0\u5f55\uff0c\u4f60\u53ef\u4ee5\u4f7f\u7528Where Current Of\u8bed\u53e5<\/p>\n

 <\/p>\n

[sql]<\/b><\/div>\n
\n
    \n
  1. DECLARE<\/li>\n
  2. \u00a0\u00a0CURSOR\u00a0CUR_NAME\u00a0IS<\/li>\n
  3. \u00a0\u00a0\u00a0\u00a0SELECT\u00a0*\u00a0FROM\u00a0EMP\u00a0WHERE\u00a0deptno=10\u00a0FOR\u00a0UPDATE\u00a0OF\u00a0sal;<\/li>\n
  4. BEGIN<\/li>\n
  5. \u00a0\u00a0FOR\u00a0REC\u00a0IN\u00a0CUR_NAME\u00a0LOOP<\/li>\n
  6. \u00a0\u00a0\u00a0\u00a0UPDATE\u00a0EMP\u00a0SET\u00a0sal\u00a0=100\u00a0;<\/li>\n
  7. \u00a0\u00a0END\u00a0LOOP;<\/li>\n
  8. END;<\/li>\n<\/ol>\n<\/div>\n

    \u4e0a\u8ff0pl\/sql\u6267\u884c\u8fc7\u4e4b\u540e\u6211\u4eec\u53d1\u73b0emp\u8868\u4e2d\u6240\u6709\u7684sal\u5217\u6570\u636e\u90fd\u88ab\u66f4\u6539\uff0c\u6b64\u65f6\u6211\u4eec\u53ea\u60f3\u66f4\u6539\u8ddf\u6e38\u6807\u5bf9\u5e94\u7684\u884c\uff0c\u6240\u4ee5\u6211\u4eec\u53c8\u5230where current of\u6267\u884c\u6e38\u6807\u904d\u5386\u65f6\u7684\u5f53\u524d\u884c\u5c31\u597d\u50cffor(int i=0;i++;i<10){}where current of\u4e0e\u201ci\u201d\u7684\u529f\u80fd\u76f8\u4f3c\u3002\u6240\u4ee5\u5f53\u6211\u4eec\u60f3\u6267\u884c\u6e38\u6807\u5f71\u54cd\u7684\u884c\u65f6\uff0c\u4e0a\u6211\u4eec\u53ef\u4ee5\u628a\u4e0a\u9762pl\/sql\u5feb\u6539\u4e3a\uff1a<\/p>\n

     <\/p>\n

    [sql]<\/b><\/div>\n
    \n
      \n
    1. DECLARE<\/li>\n
    2. \u00a0\u00a0CURSOR\u00a0CUR_NAME\u00a0IS<\/li>\n
    3. \u00a0\u00a0\u00a0\u00a0SELECT\u00a0JOB\u00a0FROM\u00a0EMP\u00a0WHERE\u00a0deptno=10\u00a0FOR\u00a0UPDATE\u00a0OF\u00a0sal;<\/li>\n
    4. BEGIN<\/li>\n
    5. \u00a0\u00a0FOR\u00a0REC\u00a0IN\u00a0CUR_NAME\u00a0LOOP<\/li>\n
    6. \u00a0\u00a0\u00a0\u00a0UPDATE\u00a0EMP\u00a0SET\u00a0sal\u00a0=100\u00a0WHERE\u00a0CURRENT\u00a0OF\u00a0CUR_NAME;<\/li>\n
    7. \u00a0\u00a0END\u00a0LOOP;<\/li>\n
    8. END;<\/li>\n<\/ol>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

      \u4e00\uff1a 1>\u9996\u5148for update\u662f\u5bf9\u8868\u7684\u884c\u8fdb\u884c\u9501\u5b9a\u3002\u9501\u5b9a\u5c31\u597d\u6bd4\u6211\u4eec\u5b66java Thread\u90a3\u4e00\u7ae0\u65f6\uff0c\u4e3a […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2],"tags":[],"class_list":["post-109","post","type-post","status-publish","format-standard","hentry","category-blog-my-blog"],"yoast_head":"\njava\u4f7f\u7528sql\u4e4b\u4f7f\u7528for update\u9501\u5b9a\u8868 - Dong's Blog<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.dongchangbin.net.cn\/?p=109\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"java\u4f7f\u7528sql\u4e4b\u4f7f\u7528for update\u9501\u5b9a\u8868 - 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