{"id":96234,"date":"2024-10-20T07:43:18","date_gmt":"2024-10-19T23:43:18","guid":{"rendered":"https:\/\/server.hk\/cnblog\/96234\/"},"modified":"2024-10-20T07:43:19","modified_gmt":"2024-10-19T23:43:19","slug":"oracle%e7%b4%84%e6%9d%9f%e7%9a%84%e6%b7%bb%e5%8a%a0%e5%8f%af%e4%bb%a5%e7%94%a8%e5%85%ad%e7%a8%ae%e6%96%b9%e6%b3%95%e8%a7%a3%e6%b1%ba","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/96234\/","title":{"rendered":"Oracle\u7d04\u675f\u7684\u6dfb\u52a0\u53ef\u4ee5\u7528\u516d\u7a2e\u65b9\u6cd5\u89e3\u6c7a"},"content":{"rendered":"<h1 id=\"oracle%e7%b4%84%e6%9d%9f%e7%9a%84%e6%b7%bb%e5%8a%a0%e5%8f%af%e4%bb%a5%e7%94%a8%e5%85%ad%e7%a8%ae%e6%96%b9%e6%b3%95%e8%a7%a3%e6%b1%ba-AHXdyyVeCk\">Oracle\u7d04\u675f\u7684\u6dfb\u52a0\u53ef\u4ee5\u7528\u516d\u7a2e\u65b9\u6cd5\u89e3\u6c7a<\/h1>\n<p>\u5728Oracle\u6578\u64da\u5eab\u4e2d\uff0c\u7d04\u675f\u662f\u7528\u4f86\u78ba\u4fdd\u6578\u64da\u7684\u5b8c\u6574\u6027\u548c\u6e96\u78ba\u6027\u7684\u91cd\u8981\u5de5\u5177\u3002\u7576\u6211\u5011\u9700\u8981\u5728\u6578\u64da\u8868\u4e2d\u6dfb\u52a0\u7d04\u675f\u6642\uff0c\u53ef\u80fd\u6703\u9047\u5230\u5404\u7a2e\u6311\u6230\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u516d\u7a2e\u89e3\u6c7a\u65b9\u6848\uff0c\u4ee5\u4fbf\u5728Oracle\u4e2d\u6709\u6548\u5730\u6dfb\u52a0\u7d04\u675f\u3002<\/p>\n<h2 id=\"1-%e4%bd%bf%e7%94%a8alter-table%e8%aa%9e%e5%8f%a5-AHXdyyVeCk\">1. \u4f7f\u7528ALTER TABLE\u8a9e\u53e5<\/h2>\n<p>\u6700\u5e38\u898b\u7684\u65b9\u6cd5\u662f\u4f7f\u7528ALTER TABLE\u8a9e\u53e5\u4f86\u6dfb\u52a0\u7d04\u675f\u3002\u9019\u7a2e\u65b9\u6cd5\u7c21\u55ae\u76f4\u63a5\uff0c\u9069\u5408\u5927\u591a\u6578\u60c5\u6cc1\u3002<\/p>\n<pre><code>ALTER TABLE table_name\nADD CONSTRAINT constraint_name\nCHECK (condition);\n<\/code><\/pre>\n<p>\u4f8b\u5982\uff0c\u82e5\u8981\u5728\u540d\u70baemployees\u7684\u8868\u4e2d\u6dfb\u52a0\u4e00\u500b\u6aa2\u67e5\u7d04\u675f\uff0c\u78ba\u4fddsalary\u5b57\u6bb5\u7684\u503c\u5927\u65bc0\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u8a9e\u53e5\uff1a<\/p>\n<pre><code>ALTER TABLE employees\nADD CONSTRAINT chk_salary\nCHECK (salary &gt; 0);\n<\/code><\/pre>\n<h2 id=\"2-%e5%9c%a8%e5%89%b5%e5%bb%ba%e8%a1%a8%e6%99%82%e6%b7%bb%e5%8a%a0%e7%b4%84%e6%9d%9f-AHXdyyVeCk\">2. \u5728\u5275\u5efa\u8868\u6642\u6dfb\u52a0\u7d04\u675f<\/h2>\n<p>\u5728\u5275\u5efa\u65b0\u8868\u6642\uff0c\u53ef\u4ee5\u76f4\u63a5\u5728CREATE TABLE\u8a9e\u53e5\u4e2d\u6dfb\u52a0\u7d04\u675f\u3002\u9019\u6a23\u53ef\u4ee5\u5728\u8868\u5275\u5efa\u7684\u540c\u6642\u78ba\u4fdd\u6578\u64da\u7684\u5b8c\u6574\u6027\u3002<\/p>\n<pre><code>CREATE TABLE employees (\n    id NUMBER PRIMARY KEY,\n    name VARCHAR2(100),\n    salary NUMBER CHECK (salary &gt; 0)\n);\n<\/code><\/pre>\n<h2 id=\"3-%e4%bd%bf%e7%94%a8pl-sql%e7%a8%8b%e5%ba%8f%e5%a1%8a-AHXdyyVeCk\">3. \u4f7f\u7528PL\/SQL\u7a0b\u5e8f\u584a<\/h2>\n<p>\u5982\u679c\u9700\u8981\u6839\u64da\u67d0\u4e9b\u689d\u4ef6\u52d5\u614b\u6dfb\u52a0\u7d04\u675f\uff0c\u53ef\u4ee5\u8003\u616e\u4f7f\u7528PL\/SQL\u7a0b\u5e8f\u584a\u3002\u9019\u7a2e\u65b9\u6cd5\u63d0\u4f9b\u4e86\u66f4\u5927\u7684\u9748\u6d3b\u6027\u3002<\/p>\n<pre><code>BEGIN\n    EXECUTE IMMEDIATE 'ALTER TABLE employees ADD CONSTRAINT chk_salary CHECK (salary &gt; 0)';\nEND;\n<\/code><\/pre>\n<h2 id=\"4-%e4%bd%bf%e7%94%a8%e8%b3%87%e6%96%99%e5%ba%ab%e8%a7%b8%e7%99%bc%e5%99%a8-AHXdyyVeCk\">4. \u4f7f\u7528\u8cc7\u6599\u5eab\u89f8\u767c\u5668<\/h2>\n<p>\u89f8\u767c\u5668\u53ef\u4ee5\u5728\u6578\u64da\u63d2\u5165\u6216\u66f4\u65b0\u6642\u81ea\u52d5\u6aa2\u67e5\u7d04\u675f\u689d\u4ef6\u3002\u9019\u7a2e\u65b9\u6cd5\u9069\u5408\u9700\u8981\u8907\u96dc\u908f\u8f2f\u7684\u60c5\u6cc1\u3002<\/p>\n<pre><code>CREATE OR REPLACE TRIGGER trg_salary\nBEFORE INSERT OR UPDATE ON employees\nFOR EACH ROW\nBEGIN\n    IF :new.salary &lt;= 0 THEN\n        RAISE_APPLICATION_ERROR(-20001, 'Salary must be greater than 0');\n    END IF;\nEND;\n<\/code><\/pre>\n<h2 id=\"5-%e4%bd%bf%e7%94%a8%e5%a4%96%e9%83%a8%e7%b4%84%e6%9d%9f-AHXdyyVeCk\">5. \u4f7f\u7528\u5916\u90e8\u7d04\u675f<\/h2>\n<p>\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u53ef\u80fd\u9700\u8981\u5728\u4e0d\u540c\u7684\u8868\u4e4b\u9593\u5efa\u7acb\u7d04\u675f\u3002\u9019\u53ef\u4ee5\u901a\u904e\u5916\u9375\u7d04\u675f\u4f86\u5be6\u73fe\u3002<\/p>\n<pre><code>ALTER TABLE orders\nADD CONSTRAINT fk_employee\nFOREIGN KEY (employee_id)\nREFERENCES employees(id);\n<\/code><\/pre>\n<h2 id=\"6-%e4%bd%bf%e7%94%a8%e6%95%b8%e6%93%9a%e5%ba%ab%e7%ae%a1%e7%90%86%e5%b7%a5%e5%85%b7-AHXdyyVeCk\">6. \u4f7f\u7528\u6578\u64da\u5eab\u7ba1\u7406\u5de5\u5177<\/h2>\n<p>\u8a31\u591a\u6578\u64da\u5eab\u7ba1\u7406\u5de5\u5177\uff08\u5982Oracle SQL Developer\uff09\u63d0\u4f9b\u4e86\u5716\u5f62\u754c\u9762\u4f86\u6dfb\u52a0\u7d04\u675f\u3002\u9019\u5c0d\u65bc\u4e0d\u719f\u6089SQL\u8a9e\u53e5\u7684\u7528\u6236\u4f86\u8aaa\u975e\u5e38\u65b9\u4fbf\u3002<\/p>\n<p>\u7528\u6236\u53ea\u9700\u9078\u64c7\u8868\uff0c\u7136\u5f8c\u5728\u7d04\u675f\u9078\u9805\u4e2d\u6dfb\u52a0\u6240\u9700\u7684\u7d04\u675f\u985e\u578b\uff0c\u5de5\u5177\u6703\u81ea\u52d5\u751f\u6210\u76f8\u61c9\u7684SQL\u8a9e\u53e5\u3002<\/p>\n<h2 id=\"%e7%b8%bd%e7%b5%90-AHXdyyVeCk\">\u7e3d\u7d50<\/h2>\n<p>\u5728Oracle\u4e2d\u6dfb\u52a0\u7d04\u675f\u7684\u65b9\u6cd5\u591a\u7a2e\u591a\u6a23\uff0c\u5f9e\u4f7f\u7528ALTER TABLE\u8a9e\u53e5\u5230\u5229\u7528PL\/SQL\u7a0b\u5e8f\u584a\u548c\u89f8\u767c\u5668\uff0c\u6bcf\u7a2e\u65b9\u6cd5\u90fd\u6709\u5176\u7279\u5b9a\u7684\u61c9\u7528\u5834\u666f\u3002\u9078\u64c7\u5408\u9069\u7684\u65b9\u6cd5\u53ef\u4ee5\u6709\u6548\u5730\u63d0\u9ad8\u6578\u64da\u7684\u5b8c\u6574\u6027\u548c\u6e96\u78ba\u6027\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u6548\u6578\u64da\u7ba1\u7406\u7684\u4f01\u696d\uff0c\u9078\u64c7\u5408\u9069\u7684\u6578\u64da\u5eab\u89e3\u6c7a\u65b9\u6848\u81f3\u95dc\u91cd\u8981\u3002\u82e5\u60a8\u5c0d\u65bc<code><a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a><\/code>\u6216<code><a href=\"https:\/\/server.hk\">\u4e91\u670d\u52a1\u5668<\/a><\/code>\u6709\u8208\u8da3\uff0c\u8acb\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u4ee5\u7372\u53d6\u66f4\u591a\u4fe1\u606f\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22\u516d\u7a2e\u65b9\u6cd5\u89e3\u6c7aOracle\u7d04\u675f\u7684\u6dfb\u52a0\u554f\u984c\uff0c\u63d0\u5347\u6578\u64da\u5eab\u6027\u80fd\u8207\u7a69\u5b9a\u6027\uff0c\u512a\u5316\u60a8\u7684\u6578\u64da\u7ba1\u7406\u7b56\u7565\u3002<\/p>\n","protected":false},"author":0,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-96234","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/96234","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=96234"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/96234\/revisions"}],"predecessor-version":[{"id":96235,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/96234\/revisions\/96235"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=96234"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=96234"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=96234"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}