{"id":118,"date":"2011-11-12T11:48:16","date_gmt":"2011-11-12T03:48:16","guid":{"rendered":"https:\/\/blog.rexdf.org\/?p=118"},"modified":"2011-11-12T11:48:16","modified_gmt":"2011-11-12T03:48:16","slug":"%e5%85%b3%e4%ba%8e%e5%88%a0%e9%99%a4%e6%97%b6%e7%9a%84%e8%a7%a6%e5%8f%91%e5%99%a8%e7%9a%84%e9%97%ae%e9%a2%98","status":"publish","type":"post","link":"https:\/\/blog.rexdf.org\/ja\/2011\/11\/%e5%85%b3%e4%ba%8e%e5%88%a0%e9%99%a4%e6%97%b6%e7%9a%84%e8%a7%a6%e5%8f%91%e5%99%a8%e7%9a%84%e9%97%ae%e9%a2%98\/","title":{"rendered":"\u5173\u4e8e\u5220\u9664\u65f6\u7684\u89e6\u53d1\u5668\u7684\u95ee\u9898"},"content":{"rendered":"

..<\/p>\n

http:\/\/v.youku.com\/v_show\/id_XMTkyNTk0NDQ0.html<\/p>\n

 <\/p>\n

\u5728\u505a\u4e00\u4e2a\u89e6\u53d1\u5668\u8981\u6c42\u4ece\u5728\u4e00\u4e2a\u8868\u4e2d\u5220\u9664\u5b8c\u67d0\u79cd\u90e8\u95e8\u7684\u4eba\u7684\u65f6\u5019\u5728\u53e6\u4e00\u4e2a\u90e8\u95e8\u8868\u4e2d\u628a\u8fd9\u4e2a\u90e8\u95e8\u4e5f\u5220\u6389\u3002 \":-P\" \u00a0\u89e6\u53d1\u5668\u8fd9\u4e48\u5199\u7684\uff1a<\/p>\n

create or replace trigger scott.emp_delete before delete on emp for each row\ndeclare\nv_temp number(2);\nbegin\nselect deptno into v_temp from emp where deptno=:old.deptno;\nif sql%NOTFOUND THEN\ndelete from dept where dept.deptno=v_temp;\nend if;\nend;<\/pre>\n
\u53d1\u73b0\u600e\u4e48\u90fd\u4f1a\u62a5\u4e0b\u9762\u7684\u9519\u8bef<\/p>\n
SQL> delete from emp2 where deptno=15;\ndelete from emp2 where deptno=15\n*\n\u7b2c 1 \u884c\u51fa\u73b0\u9519\u8bef:\nORA-04092: COMMIT \u4e0d\u80fd\u5728\u89e6\u53d1\u5668\u4e2d\nORA-06512: \u5728 \"SCOTT.EMP2_DELETE\", line 4\nORA-04088: \u89e6\u53d1\u5668 'SCOTT.EMP2_DELETE' \u6267\u884c\u8fc7\u7a0b\u4e2d\u51fa\u9519<\/pre>\n
\u6309\u7f51\u4e0a\u7684\u8bf4\u6cd5\u662fAvoiding Mutating Tables\uff0c\u8981\u7528\u5230\u81ea\u5236\u4e8b\u52a1pragma autonomous_transaction;<\/p>\n
CREATE OR REPLACE TRIGGER TR_DEL_CABLE\n\u00a0 \u00a0 \u00a0 \u00a0\u00a0\u00a0AFTER DELETE ON wire_terminal\nFOR EACH ROW\nDECLARE\u00a0\nv_count number;\npragma autonomous_transaction;\nBEGIN\n\u00a0 \u00a0 \u00a0 \u00a0 select count(*) into v_count from wire_terminal where cable_id = :Old.cable_id and cable_side = :Old.cable_side;\n\u00a0\u00a0if v_count = 0 then\n\u00a0 \u00a0 \u00a0 \u00a0\u00a0 \u00a0\u00a0\u00a0if :Old.cable_side = 1 then\n\u00a0 \u00a0 \u00a0 \u00a0\u00a0 \u00a0\u00a0\u00a0\u00a0 \u00a0 \u00a0 \u00a0 update cable set side_1_desc= '' where cable_id = :Old.cable_id;\n\u00a0 \u00a0\u00a0 \u00a0\u00a0\u00a0commit;\n\u00a0 \u00a0 \u00a0 \u00a0\u00a0 \u00a0\u00a0\u00a0else\n\u00a0 \u00a0 \u00a0 \u00a0\u00a0 \u00a0\u00a0\u00a0\u00a0 \u00a0 \u00a0 \u00a0 update cable set side_2_desc= '' where cable_id = :Old.cable_id;\n\u00a0 \u00a0 \u00a0 \u00a0\u00a0 \u00a0\u00a0 \u00a0 commit;\n\u00a0 \u00a0\u00a0 \u00a0end if;\n\u00a0 \u00a0 \u00a0 \u00a0 end if;\n\nEND TR_DEL_CABLE;<\/pre>\n
\u81ea\u6cbb\u4e8b\u52a1\u5f88\u53ef\u80fd\u662f\u8bef\u7528\u3002\u4f60\u5728\u89e6\u53d1\u5668\u91cc\u770b\u5230\u7684\u5176\u5b9e\u662f\u4fee\u6539\u4e4b\u524d\u7684\u6570\u636e\uff0c\u56e0\u4e3a\u4e3b\u4e8b\u52a1\u8fd8\u672a\u63d0\u4ea4\u3002
\n\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\u9996\u9009\u7684\u529e\u6cd5\uff1a\u4e0d\u8981\u7528\u89e6\u53d1\u5668\uff1b<\/p>\n
\u7b26\u4e00\u4e2a\u6536\u96c6\u7684\u72b6\u51b5\uff1a
\n1\uff0c\u53d8\u5316\u8868\u662f\u88abDML\u8bed\u53e5\u6b63\u5728\u4fee\u6539\u7684\u8868\uff0cdelete cascade\u4e5f\u662f\u53d8\u5316\u8868\u3002
\n\u9650\u5236\u8868\uff1a\u53ef\u80fd\u9700\u8981\u5bf9\u53c2\u8003\u5b8c\u6574\u6027\u9650\u5236\u6267\u884c\u8bfb\u64cd\u4f5c\u7684\u8868\u3002<\/p>\n
\u6bd4\u5982emp\u8868\u4e0a\u521b\u5efa\u4e86\u89e6\u53d1\u5668\uff0c\u5982\u679c\u5bf9\u8868emp\u6267\u884cDML\uff0c\u5219\u7531\u4e8eemp\u7684deptno\u662f\u53c2\u7167
\ndept\u7684\uff0c\u6240\u4ee5\u8fd9\u65f6emp\u662f\u53d8\u5316\u8868\u800cdept\u662f\u9650\u5236\u8868\u3002<\/p>\n
2\uff0cmutating table\uff1a<\/p>\n
create or replace trigger emp_trigger after update of sal on emp for each row\ndeclare\nrsal emp.sal%type;\nbegin\nselect sal into rsal from emp where ename='KIN';\nend;\n\/<\/pre>\n
\u8fd9\u4e2a\u89e6\u53d1\u5668\u867d\u7136\u53ef\u4ee5\u521b\u5efa\u6210\u529f\uff0c\u4f46\u662f\u5982\u679c\u771f\u7684\u5728emp\u5217sal\u4e0a\u6267\u884c\u4e86dml\u5219\u8fd9\u65f6emp\u7acb\u5373\u53d8\u6210mutating\u8868\uff0c
\n\u6240\u4ee5\u89e6\u53d1\u65f6\u4f1a\u53d1\u751f\u9519\u8bef\u3002<\/p>\n
ORA-04091: \u8868 SCOTT.EMP \u53d1\u751f\u4e86\u53d8\u5316, \u89e6\u53d1\u5668\/\u51fd\u6570\u4e0d\u80fd\u8bfb\u5b83<\/p>\n
\u4f46\u662f\u8fd9\u4e2a\u9650\u5236\u53ea\u5bf9\u884c\u7ea7\u89e6\u53d1\u5668\u8d77\u4f5c\u7528\uff0c\u5bf9\u8bed\u53e5\u7ea7\u7684\u4e0d\u8d77\u9650\u5236\uff1a<\/p>\n
create or replace trigger emp_trigger after update of sal on emp\ndeclare\nrsal emp.sal%type;\nbegin\nselect sal into rsal from emp where ename='KING';\nend;<\/pre>\n
\u800c\u4e14\u5982\u679c\u5bf9\u8868\u8fdb\u884c\u63d2\u5165\u4e00\u884c\u64cd\u4f5c\uff0c\u90a3\u4e48oracle\u4e0d\u628a\u89e6\u53d1\u8868\u5f53\u6210mutating table\uff0c\u63d2\u5165\u591a\u884c\u5219\u5f53\u6210mutating<\/p>\n
table\uff1a<\/p>\n
create or replace trigger emp_trigger before insert on emp for each row\ndeclare\nrsal emp.sal%type;\nbegin\nselect sal into rsal from emp where ename='KING';\nend;\n\ninsert into emp(ename,empno,sal,deptno) values('Tank',7748,4550,10);<\/pre>\n
\u8fd9\u6761\u8bed\u53e5\u53ef\u4ee5\u6267\u884c\uff0c\u4e14\u89e6\u53d1\u5668\u4e0d\u51fa\u9519\u3002<\/p>\n
\u4e0b\u9762\u5c31\u4e0d\u884c\u4e86\uff1a<\/p>\n
select * from test;\n\nX\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Y\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Z\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 M\n---------- ---------- ---------- ----------\nTii\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 3342\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 6700\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 10\nPoo\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 3355\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 6720\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 30\n\ninsert into emp(ename,empno,sal,deptno) select * from test;\n\nORA-04091: \u8868 SCOTT.EMP \u53d1\u751f\u4e86\u53d8\u5316, \u89e6\u53d1\u5668\/\u51fd\u6570\u4e0d\u80fd\u8bfb\u5b83\n\n\u5c31\u7b97\u5b50\u67e5\u8be2\u8fd4\u56de\u4e00\u6761\u4e5f\u4e0d\u884c\uff1a\n\nselect * from test;\n\nX\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Y\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Z\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 M\n---------- ---------- ---------- ----------\nPoo\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 3355\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 6720\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 30\n\ninsert into emp(ename,empno,sal,deptno) select * from test;\n\nORA-04091: \u8868 SCOTT.EMP \u53d1\u751f\u4e86\u53d8\u5316, \u89e6\u53d1\u5668\/\u51fd\u6570\u4e0d\u80fd\u8bfb\u5b83<\/pre>\n","protected":false},"excerpt":{"rendered":"
.. http:\/\/v.youku.com\/v_show\/id_XMTkyNTk … \u7d9a\u304d\u3092\u8aad\u3080 →<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[6],"tags":[50],"class_list":["post-118","post","type-post","status-publish","format-standard","hentry","category-oracle","tag-oracle-2"],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/blog.rexdf.org\/ja\/wp-json\/wp\/v2\/posts\/118","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blog.rexdf.org\/ja\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.rexdf.org\/ja\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.rexdf.org\/ja\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.rexdf.org\/ja\/wp-json\/wp\/v2\/comments?post=118"}],"version-history":[{"count":0,"href":"https:\/\/blog.rexdf.org\/ja\/wp-json\/wp\/v2\/posts\/118\/revisions"}],"wp:attachment":[{"href":"https:\/\/blog.rexdf.org\/ja\/wp-json\/wp\/v2\/media?parent=118"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.rexdf.org\/ja\/wp-json\/wp\/v2\/categories?post=118"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.rexdf.org\/ja\/wp-json\/wp\/v2\/tags?post=118"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}